Using Win32 functions in Visual FoxPro Image Gallery
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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))

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

    if (!File.Exists(oskPath))
        oskPath = Path.Combine(
            Path.Combine(winDir, "system32"), 

    if (!File.Exists(oskPath))


User rating: 7.5/10 (4 votes)
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558 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2015-10-28 09:36:34  
Visits in 7 days: 68  
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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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