Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
FindText -- the hopeless and useless Common Dialog
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Drawing Windows predefined bitmaps using the LoadBitmap functions
Placing a button on the VFP form as a new child window
Using the DrawText function
Custom FTP Class for Visual FoxPro application
Custom HttpRequest class (WinINet)
Displaying bitmap using the AlphaBlend function
Obtaining current Internet Explorer browser version and UserAgent
Creating irregularly shaped FoxPro form using transparency color key
How to activate Windows Calculator
Reading and setting the priority class values for the current process and thread
How to create non-blocking Winsock server
Opening the Page Setup dialog box to specify the attributes of a printed page
Scanning the hierarchy of child windows down from the main VFP window
Starting a dialog box for connecting to network resources (mapping network drive)
Using EnumPrinters function to enumerate locally installed printers
Using FlashWindowEx to flash the taskbar button of the VFP application
How to activate Windows Calculator

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Before you begin:
This code sample explains how to programmatically open an instance of Windows Calculator.

PUBLIC frm
frm = CreateObject("Tform")
frm.Visible = .T.

DEFINE CLASS Tform As Form
#DEFINE WM_QUIT 18
#DEFINE SW_SHOWNORMAL 1
    Width=400
    Height=200
    Caption="Activate Windows Calculator"

    ADD OBJECT cmdShow As CommandButton WITH;
        Caption="Show Calc", Height=24, Width=100,;
        Top=5, Left=10

    ADD OBJECT cmdHide As CommandButton WITH;
        Caption="Hide Calc", Height=24, Width=100,;
        Top=5, Left=112

PROCEDURE Init
    THIS.declare

PROCEDURE Destroy
    THIS._hide

PROCEDURE cmdShow.Click
    ThisForm._show

PROCEDURE cmdHide.Click
    ThisForm._hide

PROCEDURE _show
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF IsWindow(hWindow)=0
        = WinExec("calc.exe", SW_SHOWNORMAL)
        DOEVENTS
        hWindow = FindWindow(Null, "Calculator")
*        = SetParent(hWindow, _vfp.HWnd)
    ENDIF

    IF IsWindow(hWindow) <> 0
        = SetForegroundWindow(hWindow)  
*        = SetParent(hWindow, _vfp.HWnd)
        THIS.PasteNumber(PI())
    ENDIF

PROCEDURE _hide
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")
    IF IsWindow(hWindow) <> 0
        = PostMessage(hWindow, WM_QUIT, 0,0)
    ENDIF

PROCEDURE PasteNumber(cNumber)
#DEFINE WM_KEYDOWN 0x0100
#DEFINE WM_KEYUP 0x0101
#DEFINE VK_CONTROL 0x11
#DEFINE KEYEVENTF_EXTENDEDKEY 1
#DEFINE KEYEVENTF_KEYUP 2

    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF hWindow <> 0
        * stores the number in the Clipboard
        STORE TRANSFORM(m.cNumber) TO _cliptext

        * makes Calculator the foreground window
        = SetForegroundWindow(hWindow)

        * simulates CTRL+V keystroke
        = keybd_event(VK_CONTROL, 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, KEYEVENTF_KEYUP, 0)
        = keybd_event(VK_CONTROL, 0, KEYEVENTF_KEYUP, 0)
    ENDIF

PROTECTED PROCEDURE declare
    DECLARE INTEGER SetForegroundWindow IN user32;
        INTEGER hWindow

    DECLARE INTEGER IsWindow IN user32 INTEGER hWindow

    DECLARE INTEGER FindWindow IN user32;
        STRING lpClassName, STRING lpWindowName

    DECLARE INTEGER WinExec IN kernel32;
        STRING lpCmdLine, INTEGER nCmdShow

    DECLARE INTEGER PostMessage IN user32;
        INTEGER hWindow, INTEGER Msg,;
        STRING @wParam, INTEGER lParam

    DECLARE keybd_event IN user32;
        SHORT bVk, SHORT bScan, INTEGER dwFlags,;
        INTEGER dwExtraInfo

    DECLARE SHORT VkKeyScan IN user32 INTEGER ch

    DECLARE INTEGER SetParent IN user32;
        INTEGER hWndChild,;
        INTEGER hWndNewParent

ENDDEFINE

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2452 bytes  
Created: 2001-07-12 12:00:00  
Modified: 2009-12-28 21:59:15  
Visits in 7 days: 334  
Listed functions:
FindWindow
IsWindow
keybd_event
PostMessage
SetForegroundWindow
SetParent
VkKeyScan
WinExec
Printer friendly API declarations
My comment:
Btw, you can use the SetParent function to make the main VFP window (_screen.hWnd or _vfp.hWnd) the parent window for the Calculator. In that case the calculator window becomes confined in the main VFP window.
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