Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
GDI+: Implementing image scrolling with inertia
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Using Month Calendar Control (VFP9, Comctl32.dll)
Custom GDI+ class
Enumerating data formats currently available on the clipboard
Converting Unicode data from the Clipboard to a character string using a given code page
Displaying dimmed window behind VFP top-level form
Winsock: sending email messages (SMTP, port 25)
Monitoring clipboard content changes (VFP9)
Displaying icons in the system tray (VFP9)
Detecting changes in connections to removable drives (VFP9)
How to find which fonts Windows uses for drawing captions, menus and message boxes
Displaying Windows shell folders in TreeView control with Visual FoxPro FLL
Browsing Windows Known Folders (Special Folders)
Obtaining names and positions for shortcuts located on the Windows Desktop
Creating a clipping region from the path selected into the device context of a form
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
Enumerating devices installed on the local machine
Finding out if the current user is the Guest account
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: 69  
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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