Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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Capturing keyboard activity of another application with the Raw Input API (VFP9)
Displaying dimmed window behind VFP top-level form
Detecting changes in connections to removable drives (VFP9)
Moving shortcut to a specified position on the Windows Desktop
Enumerating devices installed on the local machine
Displaying icons in the system tray (VFP9)
Printing Image File, programmatically set print page orientation to landscape
Switching between keyboard layouts
How to find which fonts Windows uses for drawing captions, menus and message boxes
How to control Adobe Reader 9.0 (SDI mode) from VFP application
Winsock: resolving an address to a host name
Custom GDI+ class
Compressing and decompressing files with Windows API Runtime Library routines
Disconnecting USB Mass Storage Device programmatically
How to display Windows On-Screen Keyboard
Using Month Calendar Control (VFP9, Comctl32.dll)
How to enable the SE_SHUTDOWN_NAME privilege for the application
Writing entries to custom Event Log
Adding a background image to VFP report (VFP9, ReportListener)
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Generating random cryptographic keys
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 using Windows On-Screen Keyboard instead. This virtual keyboard 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.
private static void StartOnScreenKeyboard()
{
    const string OskExe = "osk.exe";
    var winDir = Environment.GetEnvironmentVariable("WINDIR");

    if (string.IsNullOrEmpty(winDir))
    {
        return;
    }

    var oskPath = Path.Combine(
        Path.Combine(winDir, "sysnative"), OskExe);

    if (!File.Exists(oskPath))
    {
        oskPath = Path.Combine(
            Path.Combine(winDir, "system32"), 
            OskExe);
    }

    if (!File.Exists(oskPath))
    {
        return;
    }

    Process.Start(oskPath);
}

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558 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2015-10-28 09:36:34  
Visits in 7 days: 224  
Listed functions:
GetSystemDirectory
PathCombine
ShellExecute
Printer friendly API declarations
My comment:

On-Screen Keyboard`s window class name is "OSKMainClass". Knowing this, a VFP application can test the visibility of the On-Screen Keyboard by calling the FindWindow. By calling the SetWindowPos or similar API function, the virtual keyboard can be shown, hidden, or positioned at a specified point on the screen.
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