Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating data formats currently available on the clipboard
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
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How to print FoxPro form
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Creating a clipping region from the path selected into the device context of a form
FindText -- the hopeless and useless Common Dialog
How to create transparent areas inside a form -- punching holes in the form
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Using EnumPrinters function to enumerate locally installed printers
Using the Semaphore object to allow only one instance of VFP application running
Reading VFP settings from the Windows Registry
Enumerating Processes -- WinNT
Retrieving graphic capabilities of default printer
Current keyboard type
Storing content of the Clipboard to a bitmap file
How to save registry key including its subkeys and values to a file
Placing a button on the VFP form as a new child window
Changing file attributes
Using the DeleteFile
Disabling mouse and keyboard input for the main VFP window (with the app still running)

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
DECLARE INTEGER BlockInput IN user32 INTEGER fBlockIt

? BlockInput (1)
? "*** Input blocked"

FOR ii=1 TO 10
    DO dataproc
ENDFOR

? BlockInput (0)
? "*** Input unblocked"

PROCEDURE  dataproc
* it is just an emulation of a time-consuming procedure
    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())
    USE IN cs
RETURN

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509 bytes  
Created: 2001-08-02 12:00:00  
Modified: 2008-10-03 15:25:57  
Visits in 7 days: 294  
Listed functions:
BlockInput
Printer friendly API declarations
My comment:
WinNT4, User32.dll of apr-99: Cannot find entry point BlockInput in the DLL.

During the cycle of N times running the DATAPROC, the user input is practically blocked. You can not even access the Task Manager.

Though the good old CTRL+ALT+DEL still can break through. It is quite helpful in case you have a run-time error within this cycle. Otherwise you could not be able to get out.

Note that no key presses reach the keyboard buffer during the blocking. And this is not the delay like the Sleep function creates.
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