Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
How to change display settings: screen resolution, screen refresh rate
GDI+: Storing content of the Clipboard to a bitmap file
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Custom GDI+ class
How to convert a bitmap file to monochrome format (1 bpp)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
GDI+: Implementing image scrolling with inertia
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Storing content of the Clipboard to a bitmap file
Retrieving the name of the primary domain controller (PDC) and join status information
How to put a horizontal text scrolling on the form (a news line, marquee)
How to display Windows On-Screen Keyboard
Custom HttpRequest class (WinHTTP)
How to detect if additional monitor is connected and active
Winsock: sending email messages (SMTP, port 25)
Extended MessageBox Class
GDI+: creating scaled copy of image file
GDI+: converting image file to another graphics format
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Using EnumPrinters function to enumerate locally installed printers
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Custom HttpRequest class (WinINet)
How to display Windows On-Screen Keyboard

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Before you begin:

For data entry, instead of relying on the physical keyboard, user may choose to use Windows On-Screen Keyboard that gives access to all standard keys.

On-Screen Keyboard executable file, osk.exe, resides in System32 directory. Note that on 64-bit systems this file cannot be launched from 32-bit process. "File System Redirector" article on MSDN explains why:
32-bit applications can access the native system directory by substituting %windir%\Sysnative for %windir%\System32. WOW64 recognizes Sysnative as a special alias used to indicate that the file system should not redirect the access.
#include "stdafx.h"
#include < windows.h >
#include < shlwapi.h >

void StartOnScreenKeyboard();

int _tmain(int argc, _TCHAR* argv[])
{
    StartOnScreenKeyboard();
    return 0;
}

void StartOnScreenKeyboard()
{
    const char* oskPath = "osk.exe";

    char* winDirPath = (char*)calloc(MAX_PATH, 1);
    GetEnvironmentVariable("WINDIR", winDirPath, MAX_PATH);
    if (!winDirPath) return;

    char* sysDirPath = (char*)calloc(MAX_PATH, 1);
    char* targetPath = (char*)calloc(MAX_PATH, 1);

    PathCombine(targetPath, winDirPath, "sysnative");
    PathCombine(targetPath, targetPath, oskPath);

    if (!PathFileExists(targetPath))
    {
        GetSystemDirectory(sysDirPath, MAX_PATH);
        PathCombine(targetPath, sysDirPath, oskPath);
    }

    free(sysDirPath);
    free(winDirPath);

    if (PathFileExists(targetPath))
    {
        ShellExecute(
            (HWND)0, 
            "open", 
            targetPath, 
            NULL, 
            NULL, 
            SW_NORMAL);
    }

    free(targetPath);
}

User rating: 7/10 (3 votes)
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943 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 136  
Listed functions:
GetSystemDirectory
PathCombine
ShellExecute
Printer friendly API declarations
My comment:

On-Screen Keyboard class name is "OSKMainClass". With this knowledge, a VFP application can detect whether the On-Screen Keyboard window is visible -- by calling FindWindow. It can also move and hide the keyboard -- by calling SetWindowPos or similar API function.
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