Disable/ Enable task switching

Windows with Delphi
Windows API (94)
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Disable/ Enable task switching

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Under Windows 3.x and 95/98 you can prevent that a user switches to another application with the following code which pretends to be a screensaver running. This does not work under Windows NT.

// You may need the following definition of SPI_SCREENSAVERRUNNING:
const 
  SPI_SCREENSAVERRUNNING = 97;

var
  OldValue: Longint;
begin
  // disable task switching
  SystemParametersInfo(SPI_SCREENSAVERRUNNING, True, OldValue, 0);
  // enable task switching
  SystemParametersInfo(SPI_SCREENSAVERRUNNING, False, OldValue, 0);
end.

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