Difference between revisions of "$SCREENHIDE"

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* The [[_SCREENHIDE]] statement must be used before [[_SCREENSHOW]] can be used in sections of a program.
* The [[_SCREENHIDE]] statement must be used before [[_SCREENSHOW]] can be used in sections of a program.
* '''QB64 [[Metacommand]]s require that commenting or [[REM]] NOT be used!'''
* '''QB64 [[Metacommand]]s require that commenting or [[REM]] NOT be used!'''
''Example:'' Hiding a program when displaying a message box.
{{CodeStart}} '' ''
{{Cl|$SCREENHIDE}}
{{Cl|DECLARE DYNAMIC LIBRARY}} "user32"
  {{Cl|FUNCTION}} MessageBoxA& ({{Cl|BYVAL}} hWnd%&, {{Cl|BYVAL}} lpText%&, {{Cl|BYVAL}} lpCaption%&, {{Cl|BYVAL}} uType~&)
{{Cl|DECLARE LIBRARY|END DECLARE}}
{{Cl|DECLARE DYNAMIC LIBRARY}} "kernel32"
  {{Cl|SUB}} ExitProcess ({{Cl|BYVAL}} uExitCode~&)
{{Cl|DECLARE LIBRARY|END DECLARE}}
{{Cl|DIM}} s0 {{Cl|AS}} {{Cl|STRING}}
{{Cl|DIM}} s1 {{Cl|AS}} {{Cl|STRING}}
s0 = "Text" + {{Cl|CHR$}}(0)
s1 = "Caption" + {{Cl|CHR$}}(0)
ExitProcess MessageBoxA(0, {{Cl|_OFFSET (function)|_OFFSET}}(s0), {{Cl|_OFFSET(function)|_OFFSET}}(s1), 0)
{{CodeEnd}}{{small|Code by Michael Calkins}}





Revision as of 20:50, 30 August 2012

The $SCREENHIDE Metacommand can be used to hide the main program window throughout a program.


Syntax

$SCREENHIDE


  • $SCREENHIDE may be used at the start of a program to hide the main program window when using a console window.
  • $SCREENHIDE must be used before the $SCREENSHOW Metacommand can be used!
  • The _SCREENHIDE statement must be used before _SCREENSHOW can be used in sections of a program.
  • QB64 Metacommands require that commenting or REM NOT be used!


Example: Hiding a program when displaying a message box.

$SCREENHIDE DECLARE DYNAMIC LIBRARY "user32" FUNCTION MessageBoxA& (BYVAL hWnd%&, BYVAL lpText%&, BYVAL lpCaption%&, BYVAL uType~&) END DECLARE DECLARE DYNAMIC LIBRARY "kernel32" SUB ExitProcess (BYVAL uExitCode~&) END DECLARE DIM s0 AS STRING DIM s1 AS STRING s0 = "Text" + CHR$(0) s1 = "Caption" + CHR$(0) ExitProcess MessageBoxA(0, _OFFSET(s0), _OFFSET(s1), 0)

Code by Michael Calkins


See also:



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