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See also:
  • Capturing keyboard activity of another application using the Raw Input API
  • DECLARE INTEGER GetActiveWindow IN user32 
    
    DECLARE INTEGER EnableWindow IN user32;
     INTEGER hwnd,;
     INTEGER fEnable
    
    * get handle of main VFP window
    hwnd = GetActiveWindow()
    
    ? EnableWindow (hwnd, 0)
    ? "*** Input blocked - the main VFP window only"
    
    FOR ii=1 TO 10
        DO proc1
    ENDFOR
    
    ? EnableWindow (hwnd, 1)
    ? "*** Input unblocked"
    
    PROCEDURE  proc1
        LOCAL ii
        WAIT WINDOW NOWAIT "Creating cursor..."
        CREATE CURSOR cs (id N(6), dt D)
        FOR ii=1 TO 10000
            INSERT INTO cs VALUES (ii, date()-ii)
        ENDFOR
        WAIT CLEAR
        ? Chr(9) + "- cursor created at " + TTOC (datetime())
    RETURN
    

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    605 bytes  
    Created: 2001-08-02 12:00:00  
    Modified: 2011-01-06 16:30:23  
    Visits in 7 days: 125  
    Listed functions:
    EnableWindow
    GetActiveWindow
    Printer friendly API declarations
    My comment:
    In this example user input is locked for VFP application only. This function works differently then the BlockInput does. The latter locks the window for all processes not just for the active process and thread.

    With EnableWindow you can effectively lock a VFP application. But it is more like "you lock the door and throw away the key". To unlock it use the Task Manager, or beforehand submit the instructions to some other application along with the corresponding HWND.

    Applied to windowed controls this function can enable or disable them.
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