The following example demonstrates how to embed Acrobat Reader in a PowerBASIC application.
' ########################################################################################
' WebBrowser example - Hosting a PDF document
' ########################################################################################
' SED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
#INCLUDE "ATL.INC" ' // ATL
#INCLUDE "EXDISP.INC" ' // WebBrowser Control
#INCLUDE "MSHTML.INC" ' // MSHTML
%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
AtlAxWinInit ' Initialize ATL
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 Demo: Embedding Acrobat Reader"
' 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) * 0.75 ' 75% of the client screen width
nHeight = (((rc.nBottom - rc.nTop)) + 2) * 0.70 ' 70% 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 ISFALSE IsDialogMessage(hWndMain, uMsg) THEN
TranslateMessage uMsg
DispatchMessage uMsg
END IF
END IF
WEND
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
SELECT CASE wMsg
CASE %WM_CREATE
' Get the coordinates of the main window client area
GetClientRect hWnd, rc
' Create an instance of the WebBrowser Control using ATL as the OLE container
hCtl = CreateWindowEx(0, "AtlAxWin", "Shell.Explorer", %WS_CHILD OR %WS_VISIBLE OR %WS_TABSTOP OR %WS_BORDER, _
0, 0, 0, 0, hWnd, %IDC_IEWB, GetModuleHandle(""), BYVAL %NULL)
' Set the focus in the WebBrowser Control
SetFocus hCtl
' Get a pointer to the IWebBrowser2 interface
pIWebBrowser2 = AtlAxGetDispatch(GetDlgItem(hWnd, %IDC_IEWB))
IF ISOBJECT(pIWebBrowser2) THEN
' Load the PDF document
vUrl = EXE.Path$ & "ComCollections.pdf"
pIWebBrowser2.Navigate2(vUrl)
' Release the interface
pIWebBrowser2 = NOTHING
END IF
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 - 0, rc.nBottom - rc.nTop - 0, %TRUE
END IF
CASE %WM_COMMAND
' -------------------------------------------------------
' Messages from controls and menu items are handled here.
' -------------------------------------------------------
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
PostQuitMessage 0
EXIT FUNCTION
END SELECT
FUNCTION = DefWindowProc(hWnd, wMsg, wParam, lParam)
END FUNCTION
' ========================================================================================
