Using Win32 functions in Visual FoxPro Image Gallery
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GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
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Winsock: sending email messages (SMTP, port 25)
Using EnumPrinters function to enumerate locally installed printers
How to register custom Event Log source
How to create MD-5 and SHA-1 hash values from a string
How to detect if additional monitor is connected and active
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
HOWTO: Use the Win32 API to Access File Dates and Times
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Custom HttpRequest class (WinHTTP)
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.
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: 2013-08-14 11:46:10  
Visits in 7 days: 115  
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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