Author Topic: WebBrowser Control: Web GUI  (Read 10117 times)

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Offline José Roca

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WebBrowser Control: Web GUI
« on: August 19, 2008, 04:40:33 AM »
 
The following example demonstrates how to work interactively with a web page loaded in an instance of the WebBrowser Control embedded in a PowerBASIC application.

After embedding an instance of the WebBrowser control, using ATL.DLL as the Ole Container, and connect to the events fired by the control, an HTML page containing UI elements is constructed on the fly and loaded on the control.

In the DownloadComplete event of the WebBrowser control, a connection is made to the events fired by the HTML page.

In the onclick event of the HTML document, the identifier of the UI element that as fired the event is retrieved.

Code: [Select]
' ########################################################################################
' This example demonstrates how to work interactively with a web page loaded in an instance
' of the WebBrowser Control embedded in a PowerBASIC application.
' ########################################################################################

' SED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
#INCLUDE ONCE "ATL.INC"        ' // ATL
#INCLUDE ONCE "EXDISP.INC"     ' // WebBrowser Control
%USEHTMLWRAPPERS = 1           ' // Allow the use of the HTML wrappers
#INCLUDE ONCE "MSHTML.INC"     ' // MSHTML
#INCLUDE ONCE "mshtmhst.inc"   ' // MSTHML Advanced Host Interfaces
#INCLUDE ONCE "OleIdl.inc"     ' // OleIdl

%IDC_IEWB = 101

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WINMAIN (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS ASCIIZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   LOCAL hWndMain AS DWORD
   LOCAL hCtl AS DWORD
   LOCAL hFont AS DWORD
   LOCAL wcex AS WNDCLASSEX
   LOCAL szClassName AS ASCIIZ * 80
   LOCAL rc AS RECT
   LOCAL szCaption AS ASCIIZ * 255
   LOCAL nLeft AS LONG
   LOCAL nTop AS LONG
   LOCAL nWidth AS LONG
   LOCAL nHeight AS LONG

   ' Initilize the COM library using OleInitialize to allow cut and paste
   OleInitialize 0

   ' Required: Initialize ATL
   AtlAxWinInit

   hFont = GetStockObject(%ANSI_VAR_FONT)

   ' Register the window class
   szClassName        = "WebBrowser"
   wcex.cbSize        = SIZEOF(wcex)
   wcex.style         = 0 '%CS_HREDRAW OR %CS_VREDRAW
   wcex.lpfnWndProc   = CODEPTR(WndProc)
   wcex.cbClsExtra    = 0
   wcex.cbWndExtra    = 0
   wcex.hInstance     = hInstance
   wcex.hCursor       = LoadCursor (%NULL, BYVAL %IDC_ARROW)
   wcex.hbrBackground = %COLOR_3DFACE + 1
   wcex.lpszMenuName  = %NULL
   wcex.lpszClassName = VARPTR(szClassName)
   wcex.hIcon         = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Sample, if resource icon: LoadIcon(hInst, "APPICON")
   wcex.hIconSm       = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Remember to set small icon too..
   RegisterClassEx wcex

   ' Window caption
   szCaption = "WebBrowser Example: Web Gui"

   ' Retrieve the size of the working area
   SystemParametersInfo %SPI_GETWORKAREA, 0, BYVAL VARPTR(rc), 0

   ' Calculate the position and size of the window
   nWidth  = (((rc.nRight - rc.nLeft)) + 2) * 0.50   ' 50% of the client screen width
   nHeight = (((rc.nBottom - rc.nTop)) + 2) * 0.60   ' 60% of the client screen height
   nLeft   = ((rc.nRight - rc.nLeft) \ 2) - nWidth \ 2
   nTop    = ((rc.nBottom - rc.nTop) \ 2) - (nHeight \ 2)

   ' Create a window using the registered class
   hWndMain = CreateWindowEx(%WS_EX_CONTROLPARENT, _           ' extended style
                             szClassName, _                    ' window class name
                             szCaption, _                      ' window caption
                             %WS_OVERLAPPEDWINDOW OR _
                             %WS_CLIPCHILDREN, _               ' window style
                             nLeft, _                          ' initial x position
                             nTop, _                           ' initial y position
                             nWidth, _                         ' initial x size
                             nHeight, _                        ' initial y size
                             %NULL, _                          ' parent window handle
                             0, _                              ' window menu handle
                             hInstance, _                      ' program instance handle
                             BYVAL %NULL)                      ' creation parameters

   ' Show the window
   ShowWindow hWndMain, nCmdShow
   UpdateWindow hWndMain

   ' Message handler loop
   LOCAL uMsg AS tagMsg
   WHILE GetMessage(uMsg, %NULL, 0, 0)
      IF ISFALSE AtlForwardMessage(hWndMain, uMsg) THEN
         IF IsDialogMessage(hWndMain, uMsg) = 0 THEN
            TranslateMessage uMsg
            DispatchMessage uMsg
         END IF
      END IF
   WEND

   ' Uninitialize the COM library
   OleUninitialize

   FUNCTION = uMsg.wParam

END FUNCTION
' ========================================================================================

' ========================================================================================
' PROCEDURE: AtlForwardMessage
' PURPOSE:   Forwards messages to ATL
' RETURN:    TRUE if message was processed, FALSE if it was not.
' ========================================================================================

FUNCTION AtlForwardMessage ( _
   BYVAL hWnd  AS DWORD, _   ' handle of window
   BYREF uMsg  AS tagMSG _   ' message information
   ) AS LONG

   ' Default return value
   FUNCTION = %FALSE

   ' Retrieve the handle of the window that hosts the WebBrowser control
   LOCAL hCtrl AS DWORD
   hCtrl = GetDlgItem(hWnd, %IDC_IEWB)

   ' Retrieve the ancestor of the control that has the focus
   LOCAL hWndCtrl AS DWORD
   hWndCtrl = GetFocus
   DO
      IF ISFALSE GetParent(hWndCtrl) OR GetParent(hWndCtrl) = hWnd THEN EXIT DO
      hWndCtrl = GetParent(hWndCtrl)
   LOOP

   ' If the focus is in the WebBrowser, forward the message to it
   IF hCtrl = hWndCtrl THEN
      IF ISTRUE SendMessage(hCtrl, &H37F, 0, VARPTR(uMsg)) THEN FUNCTION = %TRUE
   END IF

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main Window procedure
' ========================================================================================
FUNCTION WndProc (BYVAL hWnd AS DWORD, BYVAL wMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   LOCAL  hr AS LONG
   LOCAL  hCtl AS DWORD
   LOCAL  rc AS RECT
   LOCAL  pIWebBrowser2 AS IWebBrowser2
   LOCAL  vUrl AS VARIANT
   LOCAL  s AS STRING
   LOCAL  pHTMLDocument2 AS IHTMLDocument2
   STATIC pWBEvents AS DWebBrowserEvents2Impl

   SELECT CASE wMsg

      CASE %WM_CREATE
         GetClientRect hWnd, rc
         hCtl = CreateWindowEx(0, "AtlAxWin", "Shell.Explorer", %WS_CHILD OR %WS_VISIBLE OR %WS_TABSTOP, _
                0, 0, 0, 0, hWnd, %IDC_IEWB, GetModuleHandle(""), BYVAL %NULL)
         ' Get the IDispatch of the control
         pIWebBrowser2 = AtlAxGetDispatch(GetDlgItem(hWnd, %IDC_IEWB))
         IF ISOBJECT(pIWebBrowser2) THEN
            ' Connect to the events fired by the control
            pWBEvents = CLASS "CDWebBrowserEvents2"
            EVENTS FROM pIWebBrowser2 CALL pWBEvents
            ' Navigate to a blank page
            vUrl = "about:blank"
            pIWebBrowser2.Navigate2(vUrl)
            ' Html form
            s = "<html>" & $CRLF
            s = s & "<head>" & $CRLF
            s = s & "<meta http-equiv=""MSThemeCompatible"" content=""Yes"">" & $CRLF
            s = s & "  <title>WebGui</title>" & $CRLF
            s = s & "" & $CRLF
            s = s & "<style type=""text/css"">" & $CRLF
            s = s & "<!--" & $CRLF
            s = s & "" & $CRLF
            s = s & "#output" & $CRLF
            s = s & "{" & $CRLF
            s = s & "background: #FFFFCC;" & $CRLF
            s = s & "border: thin solid black;" & $CRLF
            s = s & "text-align: center;" & $CRLF
            s = s & "width: 300px;" & $CRLF
            s = s & "}" & $CRLF
            s = s & "-->" & $CRLF
            s = s & "</style>" & $CRLF
            s = s & "" & $CRLF
            s = s & "</head>" & $CRLF
            s = s & "<body>" & $CRLF
            s = s & "<input type =""Button"" id=""Button_1"" name=""Button_1"" value=""Button 1""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_2"" name=""Button_2"" value=""Button 2""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_3"" name=""Button_3"" value=""Button 3""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_4"" name=""Button_4"" value=""Button 4""><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<div id=""output"">" & $CRLF
            s = s & "Click a button" & $CRLF
            s = s & "</div>" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type=""Text"" id=""Input_Text"" name=""Input_Text"" value="""" size=40><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_GetText"" name=""Button_GetTex"" value=""Get text""><br />" & $CRLF
            s = s & "</body>" & $CRLF
            s = s & "</html>" & $CRLF
            ' Get a reference to the IHTMLDocument2 interface
            pHTMLDocument2 = pIWebBrowser2.Document
            IF ISOBJECT(pHTMLDocument2) THEN
               IHTMLDocument2_WriteString(pHTMLDocument2, s)
               pHTMLDocument2.close
               pHTMLDocument2 = NOTHING
            END IF
            ' Release the interface
            pIWebBrowser2 = NOTHING
         END IF
         SetFocus hCtl

      CASE %WM_SIZE
         ' Resizes the control
         IF wParam <> %SIZE_MINIMIZED THEN
            GetClientRect hWnd, rc
            MoveWindow GetDlgItem(hWnd, %IDC_IEWB), 0, 0, rc.nRight - rc.nLeft, rc.nBottom - rc.nTop, %TRUE
         END IF

      CASE %WM_COMMAND
         SELECT CASE LOWRD(wParam)
            CASE %IDCANCEL
               IF HIWRD(wParam) = %BN_CLICKED THEN
                  SendMessage hWnd, %WM_CLOSE, 0, 0
                  FUNCTION = 0
                  EXIT FUNCTION
               END IF
         END SELECT

      CASE %WM_SYSCOMMAND
         ' Capture this message and send a WM_CLOSE message
         IF (wParam AND &HFFF0) = %SC_CLOSE THEN
            SendMessage hWnd, %WM_CLOSE, 0, 0
            EXIT FUNCTION
         END IF

      CASE %WM_DESTROY
         ' Disconnect events
         IF ISOBJECT(pWBEvents) THEN EVENTS END pWBEvents
         ' Quit
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   FUNCTION = DefWindowProc(hWnd, wMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


' ########################################################################################
' Class CDWebBrowserEvents2
' Interface name = DWebBrowserEvents2
' IID = {34A715A0-6587-11D0-924A-0020AFC7AC4D}
' Web Browser Control events interface
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CDWebBrowserEvents2 GUID$("{700B73A2-CCFC-4FE0-B9AC-D5853D71B7B9}") AS EVENT

   INSTANCE pIWebBrowser2 AS IWebBrowser2
   INSTANCE pHTMLDocumentEvents2 AS HTMLDocumentEvents2Impl

   ' =====================================================================================
   CLASS METHOD Destroy
      ' Disconnect events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN EVENTS END pHTMLDocumentEvents2
   END METHOD
   ' =====================================================================================

' ========================================================================================
' Implementation of the interface
' ========================================================================================
INTERFACE DWebBrowserEvents2Impl GUID$("{34A715A0-6587-11D0-924A-0020AFC7AC4D}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   ' Note  It would be more appropriate to use the DocumentComplete event, but this
   ' event isn't fired. See: BUG: DocumentComplete Does Not Fire When WebBrowser Is Not Visible
   ' http://support.microsoft.com/kb/q259935/
   ' =====================================================================================
   METHOD DownloadComplete <104>

      ' Get a reference to the IHTMLDocument2 interface
      LOCAL pHTMLDocument2 AS IHTMLDocument2
      pHTMLDocument2 = pIWebBrowser2.Document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD
      ' Connect to the events fired by the page
      pHTMLDocumentEvents2 = CLASS "CHTMLDocumentEvents2"
      IF ISNOTHING(pHTMLDocumentEvents2) THEN EXIT METHOD
      EVENTS FROM pHTMLDocument2 CALL pHTMLDocumentEvents2

   END METHOD
   ' =====================================================================================

   ' =====================================================================================
   METHOD BeforeNavigate2 <250> ( _
     BYVAL pDisp AS IDispatch _                         ' [0] [in] pDisp /* VT_DISPATCH <IDispatch> */
   , BYREF URL AS VARIANT _                             ' [1] [in] *URL /* *VT_VARIANT <Variant> */
   , BYREF Flags AS VARIANT _                           ' [1] [in] *Flags /* *VT_VARIANT <Variant> */
   , BYREF TargetFrameName AS VARIANT _                 ' [1] [in] *TargetFrameName /* *VT_VARIANT <Variant> */
   , BYREF PostData AS VARIANT _                        ' [1] [in] *PostData /* *VT_VARIANT <Variant> */
   , BYREF Headers AS VARIANT _                         ' [1] [in] *Headers /* *VT_VARIANT <Variant> */
   , BYREF bCancel AS INTEGER _                         ' [1] [in][out] *Cancel /* *VT_BOOL <Integer> */
   )                                                    ' VOID

      ' Get a reference to the WebBrowser control
      IF ISNOTHING(pIWebBrowser2) THEN pIWebBrowser2 = pDisp
      IF ISNOTHING(pIWebBrowser2) THEN EXIT METHOD
      ' If there was a previous loaded page, disconnect from the events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN
         EVENTS END pHTMLDocumentEvents2
         pHTMLDocumentEvents2 = NOTHING
      END IF

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################


' ########################################################################################
' Class CHTMLDocumentEvents2
' Interface name = HTMLDocumentEvents2
' IID = {3050F613-98B5-11CF-BB82-00AA00BDCE0B}
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CHTMLDocumentEvents2 GUID$("{1FFB0071-8BCC-4BBD-BC29-A662FAE87C82}") AS EVENT

INTERFACE HTMLDocumentEvents2Impl GUID$("{3050F613-98B5-11CF-BB82-00AA00BDCE0B}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   METHOD onclick <-600> ( _
     BYVAL pEvtObj AS IHTMLEventObj _                   ' [1] [in] *pEvtObj /* *IHTMLEventObj <dispinterface> */
   )                                                    ' VOID

      LOCAL pElement AS IHTMLElement           ' // Element that has fired the event
      LOCAL pHTMLDocument2 AS IHTMLDocument2   ' // Document object
      LOCAL strId AS STRING                    ' // Identifier of the element that has fired the event
      LOCAL strValue AS STRING                 ' // Value of the property

      ' // Get a reference to the element that has fired the event
      IF ISOBJECT(pEvtObj) THEN pElement = pEvtObj.srcElement
      IF ISNOTHING(pElement) THEN EXIT METHOD

      ' // Get a reference to the IHTMLDocument2 interface
      pHTMLDocument2 = pElement.document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD

      ' // Get the identifier of the element that has fired the event
      strId = ACODE$(pElement.id)

      SELECT CASE strId
         CASE "Button_1", "Button_2", "Button_3", "Button_4"
            IHTMLDocument_setElementInnerHtmlById pHTMLDocument2, "output", "You have clicked " & strId
         CASE "Button_GetText"
            strValue = IHTMLDocument_getElementValueById(pHTMLDocument2, "Input_Text")
            MSGBOX strValue
      END SELECT

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################
« Last Edit: August 07, 2011, 09:28:58 AM by José Roca »

Offline José Roca

  • Administrator
  • Hero Member
  • *****
  • Posts: 2481
Re: WebBrowser Control: Web GUI
« Reply #1 on: September 08, 2008, 05:11:00 PM »
 
In the previous example you will notice that the WebBrowser control shows a disabled right scroll bar. This is usually an unwanted feature. After some research, I have find two solutions:

If you are writing the html page on the fly, as in the example, use

Code: [Select]
s = s & "<body scroll=""auto"">" & $CRLF

instead of

Code: [Select]
s = s & "<body>" & $CRLF

Using "auto", the scroll bars are shown when the page content exceeds the client area. You can disable scroll bars using "no".

If instead of writing your own page, you are loading an existing one, you can change the scroll property programatically:

Code: [Select]
               ' Set the Scroll property to "auto"
               pHTMLElement = pHTMLDocument2.body
               IF ISOBJECT(pHTMLElement) THEN
                  pHTMLBodyElement = pHTMLElement
                  IF ISOBJECT(pHTMLBodyElement) THEN
                     pHTMLBodyElement.scroll = UCODE$("auto")
                     pHTMLBodyElement = NOTHING
                  END IF
                  pHTMLElement = NOTHING
               END IF

Full code

Code: [Select]
' ########################################################################################
' This example demonstrates how to work interactively with a web page loaded in an instance
' of the WebBrowser Control embedded in a PowerBASIC application.
' ########################################################################################

' SED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
#INCLUDE ONCE "ATL.INC"        ' // ATL
#INCLUDE ONCE "EXDISP.INC"     ' // WebBrowser Control
%USEHTMLWRAPPERS = 1           ' // Allow the use of the HTML wrappers
#INCLUDE ONCE "MSHTML.INC"     ' // MSHTML
#INCLUDE ONCE "mshtmhst.inc"   ' // MSTHML Advanced Host Interfaces
#INCLUDE ONCE "OleIdl.inc"     ' // OleIdl

%IDC_IEWB = 101

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WINMAIN (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS ASCIIZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   LOCAL hWndMain AS DWORD
   LOCAL hCtl AS DWORD
   LOCAL hFont AS DWORD
   LOCAL wcex AS WNDCLASSEX
   LOCAL szClassName AS ASCIIZ * 80
   LOCAL rc AS RECT
   LOCAL szCaption AS ASCIIZ * 255
   LOCAL nLeft AS LONG
   LOCAL nTop AS LONG
   LOCAL nWidth AS LONG
   LOCAL nHeight AS LONG

   ' Initilize the COM library using OleInitialize to allow cut and paste
   OleInitialize 0

   ' Required: Initialize ATL
   AtlAxWinInit

   hFont = GetStockObject(%ANSI_VAR_FONT)

   ' Register the window class
   szClassName        = "WebBrowser"
   wcex.cbSize        = SIZEOF(wcex)
   wcex.style         = 0 '%CS_HREDRAW OR %CS_VREDRAW
   wcex.lpfnWndProc   = CODEPTR(WndProc)
   wcex.cbClsExtra    = 0
   wcex.cbWndExtra    = 0
   wcex.hInstance     = hInstance
   wcex.hCursor       = LoadCursor (%NULL, BYVAL %IDC_ARROW)
   wcex.hbrBackground = %COLOR_3DFACE + 1
   wcex.lpszMenuName  = %NULL
   wcex.lpszClassName = VARPTR(szClassName)
   wcex.hIcon         = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Sample, if resource icon: LoadIcon(hInst, "APPICON")
   wcex.hIconSm       = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Remember to set small icon too..
   RegisterClassEx wcex

   ' Window caption
   szCaption = "WebBrowser Example: Web Gui"

   ' Retrieve the size of the working area
   SystemParametersInfo %SPI_GETWORKAREA, 0, BYVAL VARPTR(rc), 0

   ' Calculate the position and size of the window
   nWidth  = (((rc.nRight - rc.nLeft)) + 2) * 0.50   ' 50% of the client screen width
   nHeight = (((rc.nBottom - rc.nTop)) + 2) * 0.60   ' 60% of the client screen height
   nLeft   = ((rc.nRight - rc.nLeft) \ 2) - nWidth \ 2
   nTop    = ((rc.nBottom - rc.nTop) \ 2) - (nHeight \ 2)

   ' Create a window using the registered class
   hWndMain = CreateWindowEx(%WS_EX_CONTROLPARENT, _           ' extended style
                             szClassName, _                    ' window class name
                             szCaption, _                      ' window caption
                             %WS_OVERLAPPEDWINDOW OR _
                             %WS_CLIPCHILDREN, _               ' window style
                             nLeft, _                          ' initial x position
                             nTop, _                           ' initial y position
                             nWidth, _                         ' initial x size
                             nHeight, _                        ' initial y size
                             %NULL, _                          ' parent window handle
                             0, _                              ' window menu handle
                             hInstance, _                      ' program instance handle
                             BYVAL %NULL)                      ' creation parameters

   ' Show the window
   ShowWindow hWndMain, nCmdShow
   UpdateWindow hWndMain

   ' Message handler loop
   LOCAL uMsg AS tagMsg
   WHILE GetMessage(uMsg, %NULL, 0, 0)
      IF ISFALSE AtlForwardMessage(hWndMain, uMsg) THEN
         IF IsDialogMessage(hWndMain, uMsg) = 0 THEN
            TranslateMessage uMsg
            DispatchMessage uMsg
         END IF
      END IF
   WEND

   ' Uninitialize the COM library
   OleUninitialize

   FUNCTION = uMsg.wParam

END FUNCTION
' ========================================================================================

' ========================================================================================
' PROCEDURE: AtlForwardMessage
' PURPOSE:   Forwards messages to ATL
' RETURN:    TRUE if message was processed, FALSE if it was not.
' ========================================================================================

FUNCTION AtlForwardMessage ( _
   BYVAL hWnd  AS DWORD, _   ' handle of window
   BYREF uMsg  AS tagMSG _   ' message information
   ) AS LONG

   ' Default return value
   FUNCTION = %FALSE

   ' Retrieve the handle of the window that hosts the WebBrowser control
   LOCAL hCtrl AS DWORD
   hCtrl = GetDlgItem(hWnd, %IDC_IEWB)

   ' Retrieve the ancestor of the control that has the focus
   LOCAL hWndCtrl AS DWORD
   hWndCtrl = GetFocus
   DO
      IF ISFALSE GetParent(hWndCtrl) OR GetParent(hWndCtrl) = hWnd THEN EXIT DO
      hWndCtrl = GetParent(hWndCtrl)
   LOOP

   ' If the focus is in the WebBrowser, forward the message to it
   IF hCtrl = hWndCtrl THEN
      IF ISTRUE SendMessage(hCtrl, &H37F, 0, VARPTR(uMsg)) THEN FUNCTION = %TRUE
   END IF

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main Window procedure
' ========================================================================================
FUNCTION WndProc (BYVAL hWnd AS DWORD, BYVAL wMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   LOCAL  hr AS LONG
   LOCAL  hCtl AS DWORD
   LOCAL  rc AS RECT
   LOCAL  pIWebBrowser2 AS IWebBrowser2
   LOCAL  vUrl AS VARIANT
   LOCAL  s AS STRING
   LOCAL  pHTMLDocument2 AS IHTMLDocument2
   LOCAL  pHTMLElement AS IHTMLElement
   LOCAL  pHTMLBodyElement AS IHTMLBodyElement
   STATIC pWBEvents AS DWebBrowserEvents2Impl

   SELECT CASE wMsg

      CASE %WM_CREATE
         GetClientRect hWnd, rc
         hCtl = CreateWindowEx(0, "AtlAxWin", "Shell.Explorer", %WS_CHILD OR %WS_VISIBLE OR %WS_TABSTOP, _
                0, 0, 0, 0, hWnd, %IDC_IEWB, GetModuleHandle(""), BYVAL %NULL)
         ' Get the IDispatch of the control
         pIWebBrowser2 = AtlAxGetDispatch(GetDlgItem(hWnd, %IDC_IEWB))
         IF ISOBJECT(pIWebBrowser2) THEN
            ' Connect to the events fired by the control
            pWBEvents = CLASS "CDWebBrowserEvents2"
            EVENTS FROM pIWebBrowser2 CALL pWBEvents
            ' Navigate to a blank page
            vUrl = "about:blank"
            pIWebBrowser2.Navigate2(vUrl)
            ' Html form
            s = "<html>" & $CRLF
            s = s & "<head>" & $CRLF
            s = s & "<meta http-equiv=""MSThemeCompatible"" content=""Yes"">" & $CRLF
            s = s & "  <title>WebGui</title>" & $CRLF
            s = s & "" & $CRLF
            s = s & "<style type=""text/css"">" & $CRLF
            s = s & "<!--" & $CRLF
            s = s & "" & $CRLF
            s = s & "#output" & $CRLF
            s = s & "{" & $CRLF
            s = s & "background: #FFFFCC;" & $CRLF
            s = s & "border: thin solid black;" & $CRLF
            s = s & "text-align: center;" & $CRLF
            s = s & "width: 300px;" & $CRLF
            s = s & "}" & $CRLF
            s = s & "-->" & $CRLF
            s = s & "</style>" & $CRLF
            s = s & "" & $CRLF
            s = s & "</head>" & $CRLF
            s = s & "<body>" & $CRLF
            s = s & "<input type =""Button"" id=""Button_1"" name=""Button_1"" value=""Button 1""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_2"" name=""Button_2"" value=""Button 2""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_3"" name=""Button_3"" value=""Button 3""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_4"" name=""Button_4"" value=""Button 4""><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<div id=""output"">" & $CRLF
            s = s & "Click a button" & $CRLF
            s = s & "</div>" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type=""Text"" id=""Input_Text"" name=""Input_Text"" value="""" size=40><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_GetText"" name=""Button_GetTex"" value=""Get text""><br />" & $CRLF
            s = s & "</body>" & $CRLF
            s = s & "</html>" & $CRLF
            ' Get a reference to the IHTMLDocument2 interface
            pHTMLDocument2 = pIWebBrowser2.Document
            IF ISOBJECT(pHTMLDocument2) THEN
               IHTMLDocument2_WriteString(pHTMLDocument2, s)
               pHTMLDocument2.close
               ' Set the Scroll property to "auto"
               pHTMLElement = pHTMLDocument2.body
               IF ISOBJECT(pHTMLElement) THEN
                  pHTMLBodyElement = pHTMLElement
                  IF ISOBJECT(pHTMLBodyElement) THEN
                     pHTMLBodyElement.scroll = UCODE$("auto")
                     pHTMLBodyElement = NOTHING
                  END IF
                  pHTMLElement = NOTHING
               END IF
               pHTMLDocument2 = NOTHING
            END IF
            ' Release the interface
            pIWebBrowser2 = NOTHING
         END IF
         SetFocus hCtl

      CASE %WM_SIZE
         ' Resizes the control
         IF wParam <> %SIZE_MINIMIZED THEN
            GetClientRect hWnd, rc
            MoveWindow GetDlgItem(hWnd, %IDC_IEWB), 0, 0, rc.nRight - rc.nLeft, rc.nBottom - rc.nTop, %TRUE
         END IF

      CASE %WM_COMMAND
         SELECT CASE LOWRD(wParam)
            CASE %IDCANCEL
               IF HIWRD(wParam) = %BN_CLICKED THEN
                  SendMessage hWnd, %WM_CLOSE, 0, 0
                  FUNCTION = 0
                  EXIT FUNCTION
               END IF
         END SELECT

      CASE %WM_SYSCOMMAND
         ' Capture this message and send a WM_CLOSE message
         IF (wParam AND &HFFF0) = %SC_CLOSE THEN
            SendMessage hWnd, %WM_CLOSE, 0, 0
            EXIT FUNCTION
         END IF

      CASE %WM_DESTROY
         ' Disconnect events
         IF ISOBJECT(pWBEvents) THEN EVENTS END pWBEvents
         ' Quit
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   FUNCTION = DefWindowProc(hWnd, wMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


' ########################################################################################
' Class CDWebBrowserEvents2
' Interface name = DWebBrowserEvents2
' IID = {34A715A0-6587-11D0-924A-0020AFC7AC4D}
' Web Browser Control events interface
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CDWebBrowserEvents2 GUID$("{700B73A2-CCFC-4FE0-B9AC-D5853D71B7B9}") AS EVENT

   INSTANCE pIWebBrowser2 AS IWebBrowser2
   INSTANCE pHTMLDocumentEvents2 AS HTMLDocumentEvents2Impl

   ' =====================================================================================
   CLASS METHOD Destroy
      ' Disconnect events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN EVENTS END pHTMLDocumentEvents2
   END METHOD
   ' =====================================================================================

' ========================================================================================
' Implementation of the interface
' ========================================================================================
INTERFACE DWebBrowserEvents2Impl GUID$("{34A715A0-6587-11D0-924A-0020AFC7AC4D}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   ' Note  It would be more appropriate to use the DocumentComplete event, but this
   ' event isn't fired. See: BUG: DocumentComplete Does Not Fire When WebBrowser Is Not Visible
   ' http://support.microsoft.com/kb/q259935/
   ' =====================================================================================
   METHOD DownloadComplete <104>

      ' Get a reference to the IHTMLDocument2 interface
      LOCAL pHTMLDocument2 AS IHTMLDocument2
      pHTMLDocument2 = pIWebBrowser2.Document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD
      ' Connect to the events fired by the page
      pHTMLDocumentEvents2 = CLASS "CHTMLDocumentEvents2"
      IF ISNOTHING(pHTMLDocumentEvents2) THEN EXIT METHOD
      EVENTS FROM pHTMLDocument2 CALL pHTMLDocumentEvents2

   END METHOD
   ' =====================================================================================

   ' =====================================================================================
   METHOD BeforeNavigate2 <250> ( _
     BYVAL pDisp AS IDispatch _                         ' [0] [in] pDisp /* VT_DISPATCH <IDispatch> */
   , BYREF URL AS VARIANT _                             ' [1] [in] *URL /* *VT_VARIANT <Variant> */
   , BYREF Flags AS VARIANT _                           ' [1] [in] *Flags /* *VT_VARIANT <Variant> */
   , BYREF TargetFrameName AS VARIANT _                 ' [1] [in] *TargetFrameName /* *VT_VARIANT <Variant> */
   , BYREF PostData AS VARIANT _                        ' [1] [in] *PostData /* *VT_VARIANT <Variant> */
   , BYREF Headers AS VARIANT _                         ' [1] [in] *Headers /* *VT_VARIANT <Variant> */
   , BYREF bCancel AS INTEGER _                         ' [1] [in][out] *Cancel /* *VT_BOOL <Integer> */
   )                                                    ' VOID

      ' Get a reference to the WebBrowser control
      IF ISNOTHING(pIWebBrowser2) THEN pIWebBrowser2 = pDisp
      IF ISNOTHING(pIWebBrowser2) THEN EXIT METHOD
      ' If there was a previous loaded page, disconnect from the events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN
         EVENTS END pHTMLDocumentEvents2
         pHTMLDocumentEvents2 = NOTHING
      END IF

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################


' ########################################################################################
' Class CHTMLDocumentEvents2
' Interface name = HTMLDocumentEvents2
' IID = {3050F613-98B5-11CF-BB82-00AA00BDCE0B}
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CHTMLDocumentEvents2 GUID$("{1FFB0071-8BCC-4BBD-BC29-A662FAE87C82}") AS EVENT

INTERFACE HTMLDocumentEvents2Impl GUID$("{3050F613-98B5-11CF-BB82-00AA00BDCE0B}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   METHOD onclick <-600> ( _
     BYVAL pEvtObj AS IHTMLEventObj _                   ' [1] [in] *pEvtObj /* *IHTMLEventObj <dispinterface> */
   )                                                    ' VOID

      LOCAL pElement AS IHTMLElement           ' // Element that has fired the event
      LOCAL pHTMLDocument2 AS IHTMLDocument2   ' // Document object
      LOCAL strId AS STRING                    ' // Identifier of the element that has fired the event
      LOCAL strValue AS STRING                 ' // Value of the property

      ' // Get a reference to the element that has fired the event
      IF ISOBJECT(pEvtObj) THEN pElement = pEvtObj.srcElement
      IF ISNOTHING(pElement) THEN EXIT METHOD

      ' // Get a reference to the IHTMLDocument2 interface
      pHTMLDocument2 = pElement.document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD

      ' // Get the identifier of the element that has fired the event
      strId = ACODE$(pElement.id)

      SELECT CASE strId
         CASE "Button_1", "Button_2", "Button_3", "Button_4"
            IHTMLDocument_setElementInnerHtmlById pHTMLDocument2, "output", "You have clicked " & strId
         CASE "Button_GetText"
            strValue = IHTMLDocument_getElementValueById(pHTMLDocument2, "Input_Text")
            MSGBOX strValue
      END SELECT

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################

« Last Edit: August 07, 2011, 09:29:31 AM by José Roca »

Offline José Roca

  • Administrator
  • Hero Member
  • *****
  • Posts: 2481
Re: WebBrowser Control: Web GUI
« Reply #2 on: December 05, 2008, 03:35:48 PM »
 
The following version uses my OLE Container (OLECON.INC) instead of ATL.

Code: [Select]
' ########################################################################################
' This example demonstrates how to work interactively with a web page loaded in an instance
' of the WebBrowser Control embedded in a PowerBASIC application.
' ########################################################################################

' SED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
#INCLUDE ONCE "OLECON.INC"     ' // Ole Container
#INCLUDE ONCE "EXDISP.INC"     ' // WebBrowser Control
%USEHTMLWRAPPERS = 1           ' // Allow the use of the HTML wrappers
#INCLUDE ONCE "MSHTML.INC"     ' // MSHTML
#INCLUDE ONCE "mshtmhst.inc"   ' // MSTHML Advanced Host Interfaces

%IDC_IEWB = 101

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WINMAIN (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS ASCIIZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   LOCAL hWndMain    AS DWORD
   LOCAL hFont       AS DWORD
   LOCAL wcex        AS WNDCLASSEX
   LOCAL szClassName AS ASCIIZ * 80
   LOCAL rc          AS RECT
   LOCAL szCaption   AS ASCIIZ * 255
   LOCAL nLeft       AS LONG
   LOCAL nTop        AS LONG
   LOCAL nWidth      AS LONG
   LOCAL nHeight     AS LONG

   ' Initilize the COM library using OleInitialize to allow cut and paste
   OleInitialize 0

   ' Required: Initialize the Ole Container
   OC_WinInit

   hFont = GetStockObject(%ANSI_VAR_FONT)

   ' Register the window class
   szClassName        = "WebBrowser"
   wcex.cbSize        = SIZEOF(wcex)
   wcex.style         = 0 '%CS_HREDRAW OR %CS_VREDRAW
   wcex.lpfnWndProc   = CODEPTR(WndProc)
   wcex.cbClsExtra    = 0
   wcex.cbWndExtra    = 0
   wcex.hInstance     = hInstance
   wcex.hCursor       = LoadCursor (%NULL, BYVAL %IDC_ARROW)
   wcex.hbrBackground = %COLOR_3DFACE + 1
   wcex.lpszMenuName  = %NULL
   wcex.lpszClassName = VARPTR(szClassName)
   wcex.hIcon         = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Sample, if resource icon: LoadIcon(hInst, "APPICON")
   wcex.hIconSm       = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Remember to set small icon too..
   RegisterClassEx wcex

   ' Window caption
   szCaption = "WebBrowser Example: Web Gui"

   ' Retrieve the size of the working area
   SystemParametersInfo %SPI_GETWORKAREA, 0, BYVAL VARPTR(rc), 0

   ' Calculate the position and size of the window
   nWidth  = (((rc.nRight - rc.nLeft)) + 2) * 0.50   ' 50% of the client screen width
   nHeight = (((rc.nBottom - rc.nTop)) + 2) * 0.60   ' 60% of the client screen height
   nLeft   = ((rc.nRight - rc.nLeft) \ 2) - nWidth \ 2
   nTop    = ((rc.nBottom - rc.nTop) \ 2) - (nHeight \ 2)

   ' Create a window using the registered class
   hWndMain = CreateWindowEx(%WS_EX_CONTROLPARENT, _           ' extended style
                             szClassName, _                    ' window class name
                             szCaption, _                      ' window caption
                             %WS_OVERLAPPEDWINDOW OR _
                             %WS_CLIPCHILDREN, _               ' window style
                             nLeft, _                          ' initial x position
                             nTop, _                           ' initial y position
                             nWidth, _                         ' initial x size
                             nHeight, _                        ' initial y size
                             %NULL, _                          ' parent window handle
                             0, _                              ' window menu handle
                             hInstance, _                      ' program instance handle
                             BYVAL %NULL)                      ' creation parameters

   ' Show the window
   ShowWindow hWndMain, nCmdShow
   UpdateWindow hWndMain

   ' Message handler loop
   LOCAL uMsg AS tagMsg
   WHILE GetMessage(uMsg, %NULL, 0, 0)
      IF ISFALSE OC_ForwardMessage(GetFocus, uMsg) THEN
         IF IsDialogMessage(hWndMain, uMsg) = 0 THEN
            TranslateMessage uMsg
            DispatchMessage uMsg
         END IF
      END IF
   WEND

   ' Uninitialize the COM library
   OleUninitialize

   FUNCTION = uMsg.wParam

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main Window procedure
' ========================================================================================
FUNCTION WndProc (BYVAL hWnd AS DWORD, BYVAL wMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   LOCAL  hr               AS LONG
   LOCAL  hCtl             AS DWORD
   LOCAL  rc               AS RECT
   LOCAL  vUrl             AS VARIANT
   LOCAL  s                AS STRING
   LOCAL  pIWebBrowser2    AS IWebBrowser2
   LOCAL  pHTMLDocument2   AS IHTMLDocument2
   LOCAL  pHTMLElement     AS IHTMLElement
   LOCAL  pHTMLBodyElement AS IHTMLBodyElement
   STATIC pWBEvents        AS DWebBrowserEvents2Impl

   SELECT CASE wMsg

      CASE %WM_CREATE
         GetClientRect hWnd, rc
         hCtl = CreateWindowEx(0, $OC_CLASSNAME, "Shell.Explorer", %WS_CHILD OR %WS_VISIBLE OR %WS_TABSTOP, _
                0, 0, 0, 0, hWnd, %IDC_IEWB, GetModuleHandle(""), BYVAL %NULL)
         ' Get the IDispatch of the control
         pIWebBrowser2 = OC_GetDispatch(GetDlgItem(hWnd, %IDC_IEWB))
         IF ISOBJECT(pIWebBrowser2) THEN
            ' Connect to the events fired by the control
            pWBEvents = CLASS "CDWebBrowserEvents2"
            EVENTS FROM pIWebBrowser2 CALL pWBEvents
            ' Navigate to a blank page
            vUrl = "about:blank"
            pIWebBrowser2.Navigate2(vUrl)
            ' Html form
            s = "<html>" & $CRLF
            s = s & "<head>" & $CRLF
            s = s & "<meta http-equiv=""MSThemeCompatible"" content=""Yes"">" & $CRLF
            s = s & "  <title>WebGui</title>" & $CRLF
            s = s & "" & $CRLF
            s = s & "<style type=""text/css"">" & $CRLF
            s = s & "<!--" & $CRLF
            s = s & "" & $CRLF
            s = s & "#output" & $CRLF
            s = s & "{" & $CRLF
            s = s & "background: #FFFFCC;" & $CRLF
            s = s & "border: thin solid black;" & $CRLF
            s = s & "text-align: center;" & $CRLF
            s = s & "width: 300px;" & $CRLF
            s = s & "}" & $CRLF
            s = s & "-->" & $CRLF
            s = s & "</style>" & $CRLF
            s = s & "" & $CRLF
            s = s & "</head>" & $CRLF
            s = s & "<body>" & $CRLF
            s = s & "<input type =""Button"" id=""Button_1"" name=""Button_1"" value=""Button 1""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_2"" name=""Button_2"" value=""Button 2""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_3"" name=""Button_3"" value=""Button 3""><br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_4"" name=""Button_4"" value=""Button 4""><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<div id=""output"">" & $CRLF
            s = s & "Click a button" & $CRLF
            s = s & "</div>" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type=""Text"" id=""Input_Text"" name=""Input_Text"" value="""" size=40><br />" & $CRLF
            s = s & "<br />" & $CRLF
            s = s & "<input type =""Button"" id=""Button_GetText"" name=""Button_GetTex"" value=""Get text""><br />" & $CRLF
            s = s & "</body>" & $CRLF
            s = s & "</html>" & $CRLF
            ' Get a reference to the IHTMLDocument2 interface
            pHTMLDocument2 = pIWebBrowser2.Document
            IF ISOBJECT(pHTMLDocument2) THEN
               IHTMLDocument2_WriteString(pHTMLDocument2, s)
               pHTMLDocument2.close
               ' Set the Scroll property to "auto"
               pHTMLElement = pHTMLDocument2.body
               IF ISOBJECT(pHTMLElement) THEN
                  pHTMLBodyElement = pHTMLElement
                  IF ISOBJECT(pHTMLBodyElement) THEN
                     pHTMLBodyElement.scroll = UCODE$("auto")
                     pHTMLBodyElement = NOTHING
                  END IF
                  pHTMLElement = NOTHING
               END IF
               pHTMLDocument2 = NOTHING
            END IF
            ' Release the interface
            pIWebBrowser2 = NOTHING
         END IF
         SetFocus hCtl

      CASE %WM_SIZE
         ' Resizes the control
         IF wParam <> %SIZE_MINIMIZED THEN
            GetClientRect hWnd, rc
            MoveWindow GetDlgItem(hWnd, %IDC_IEWB), 0, 0, rc.nRight - rc.nLeft, rc.nBottom - rc.nTop, %TRUE
         END IF

      CASE %WM_COMMAND
         SELECT CASE LOWRD(wParam)
            CASE %IDCANCEL
               IF HIWRD(wParam) = %BN_CLICKED THEN
                  SendMessage hWnd, %WM_CLOSE, 0, 0
                  FUNCTION = 0
                  EXIT FUNCTION
               END IF
         END SELECT

      CASE %WM_SYSCOMMAND
         ' Capture this message and send a WM_CLOSE message
         IF (wParam AND &HFFF0) = %SC_CLOSE THEN
            SendMessage hWnd, %WM_CLOSE, 0, 0
            EXIT FUNCTION
         END IF

      CASE %WM_DESTROY
         ' Disconnect events and quit
         IF ISOBJECT(pWBEvents) THEN EVENTS END pWBEvents
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   FUNCTION = DefWindowProc(hWnd, wMsg, wParam, lParam)

END FUNCTION
' ========================================================================================


' ########################################################################################
' Class CDWebBrowserEvents2
' Interface name = DWebBrowserEvents2
' IID = {34A715A0-6587-11D0-924A-0020AFC7AC4D}
' Web Browser Control events interface
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CDWebBrowserEvents2 GUID$("{700B73A2-CCFC-4FE0-B9AC-D5853D71B7B9}") AS EVENT

   INSTANCE pIWebBrowser2 AS IWebBrowser2
   INSTANCE pHTMLDocumentEvents2 AS HTMLDocumentEvents2Impl

   ' =====================================================================================
   CLASS METHOD Destroy
      ' Disconnect events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN EVENTS END pHTMLDocumentEvents2
   END METHOD
   ' =====================================================================================

' ========================================================================================
' Implementation of the interface
' ========================================================================================
INTERFACE DWebBrowserEvents2Impl GUID$("{34A715A0-6587-11D0-924A-0020AFC7AC4D}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   ' Note  It would be more appropriate to use the DocumentComplete event, but this
   ' event isn't fired. See: BUG: DocumentComplete Does Not Fire When WebBrowser Is Not Visible
   ' http://support.microsoft.com/kb/q259935/
   ' =====================================================================================
   METHOD DownloadComplete <104>

      ' Get a reference to the IHTMLDocument2 interface
      LOCAL pHTMLDocument2 AS IHTMLDocument2
      pHTMLDocument2 = pIWebBrowser2.Document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD
      ' Connect to the events fired by the page
      pHTMLDocumentEvents2 = CLASS "CHTMLDocumentEvents2"
      IF ISNOTHING(pHTMLDocumentEvents2) THEN EXIT METHOD
      EVENTS FROM pHTMLDocument2 CALL pHTMLDocumentEvents2

   END METHOD
   ' =====================================================================================

   ' =====================================================================================
   METHOD BeforeNavigate2 <250> ( _
     BYVAL pDisp AS IDispatch _                         ' __in IDispatch* pDisp
   , BYREF vURL AS VARIANT _                            ' __in VARIANT* URL
   , BYREF vFlags AS VARIANT _                          ' __in VARIANT* Flags
   , BYREF vTargetFrameName AS VARIANT _                ' __in VARIANT* TargetFrameName
   , BYREF vPostData AS VARIANT _                       ' __in VARIANT* PostData
   , BYREF vHeaders AS VARIANT _                        ' __in VARIANT* Headers
   , BYREF bCancel AS INTEGER _                         ' __in_out VARIANT_BOOL* Cancel
   )                                                    ' void

      ' Get a reference to the WebBrowser control
      IF ISNOTHING(pIWebBrowser2) THEN pIWebBrowser2 = pDisp
      IF ISNOTHING(pIWebBrowser2) THEN EXIT METHOD
      ' If there was a previous loaded page, disconnect from the events
      IF ISOBJECT(pHTMLDocumentEvents2) THEN
         EVENTS END pHTMLDocumentEvents2
         pHTMLDocumentEvents2 = NOTHING
      END IF

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################


' ########################################################################################
' Class CHTMLDocumentEvents2
' Interface name = HTMLDocumentEvents2
' IID = {3050F613-98B5-11CF-BB82-00AA00BDCE0B}
' Attributes = 4112 [&H1010] [Hidden] [Dispatchable]
' ########################################################################################

CLASS CHTMLDocumentEvents2 GUID$("{1FFB0071-8BCC-4BBD-BC29-A662FAE87C82}") AS EVENT

INTERFACE HTMLDocumentEvents2Impl GUID$("{3050F613-98B5-11CF-BB82-00AA00BDCE0B}") AS EVENT

  INHERIT IDispatch

   ' =====================================================================================
   METHOD onclick <-600> ( _
     BYVAL pEvtObj AS IHTMLEventObj _                   ' __in IHTMLEventObj* pEvtObj
   )                                                    ' void

      LOCAL pElement AS IHTMLElement           ' // Element that has fired the event
      LOCAL pHTMLDocument2 AS IHTMLDocument2   ' // Document object
      LOCAL strId AS STRING                    ' // Identifier of the element that has fired the event
      LOCAL strValue AS STRING                 ' // Value of the property

      ' // Get a reference to the element that has fired the event
      IF ISOBJECT(pEvtObj) THEN pElement = pEvtObj.srcElement
      IF ISNOTHING(pElement) THEN EXIT METHOD

      ' // Get a reference to the IHTMLDocument2 interface
      pHTMLDocument2 = pElement.document
      IF ISNOTHING(pHTMLDocument2) THEN EXIT METHOD

      ' // Get the identifier of the element that has fired the event
      strId = ACODE$(pElement.id)

      SELECT CASE strId
         CASE "Button_1", "Button_2", "Button_3", "Button_4"
            IHTMLDocument_setElementInnerHtmlById pHTMLDocument2, "output", "You have clicked " & strId
         CASE "Button_GetText"
            strValue = IHTMLDocument_getElementValueById(pHTMLDocument2, "Input_Text")
            MSGBOX strValue
      END SELECT

   END METHOD
   ' =====================================================================================

END INTERFACE

END CLASS
' ########################################################################################
« Last Edit: August 07, 2011, 09:29:48 AM by José Roca »

Offline Ken Levin

  • Newbie
  • *
  • Posts: 3
Re: WebBrowser Control: Web GUI
« Reply #3 on: November 24, 2012, 08:04:41 PM »
Thank you for posting this sample (and for posting so many other great samples).  I found (in 2012) I needed to remove the ACODE$(variablename) to get the program to work when compiled under PBWin 10.

In method onclick I changed  strId = ACODE$(pElement.Id)  to strID = pElement.Id

Evidentally PB10 automatically handles ACODE$ functionality.

Question:  How did you know that method IHTMLDocument_getElementValueById existed in the IHTMLDocument interface?  I searched google for getElementValueById + checked the DOM reference and didn't see any reference to this method.

Question:  what book/documentation do you suggest I read to get comfortable with this method of programming (using web browser control); seems like there is a world of opportunity leveraging a browser with a container that is controlled by a programmer.

Thanks

Ken Levin

Offline José Roca

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  • Hero Member
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  • Posts: 2481
Re: WebBrowser Control: Web GUI
« Reply #4 on: November 24, 2012, 08:28:19 PM »
Quote
Question:  How did you know that method IHTMLDocument_getElementValueById existed in the IHTMLDocument interface?  I searched google for getElementValueById + checked the DOM reference and didn't see any reference to this method.

It is not a method of any interface, it is a wrapper function that I wrote. You can find it in the file MSHTML.inc.

Quote
Question:  what book/documentation do you suggest I read to get comfortable with this method of programming (using web browser control); seems like there is a world of opportunity leveraging a browser with a container that is controlled by a programmer.

I don't have any book. I use the MSDN documentation:

http://msdn.microsoft.com/en-us/library/aa752127%28v=vs.85%29.aspx

Offline Ken Levin

  • Newbie
  • *
  • Posts: 3
Re: WebBrowser Control: Web GUI
« Reply #5 on: November 24, 2012, 09:25:25 PM »
I see it. Thank you.