How to draw directly on the Windows Desktop?
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Through some API functions like
To draw a text
Handle := GetDesktopWindow;
Dc := GetWindowDC(Handle) ;
ACanvas := TCanvas.Create;
try
ACanvas.Handle := DC;
BeginPath(ACanvas.Handle) ;
ACanvas.Font.Color := clRed;
ACanvas.Font.Name := 'Tahoma';
ACanvas.Font.Size := 30;
SetBkMode(ACanvas.Handle, TRANSPARENT) ;
EndPath(ACanvas.Handle) ;
ACanvas.TextOut(0, 0, TextToDraw) ;
finally
ReleaseDC(Handle, ACanvas.Handle) ;
ACanvas.Free;
end;
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