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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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6e01fc8dce
Added new _STRCMP and _STRICMP commands for quick string comparisons. Cleaned up QB64 to finish removing the QUI (quick user insert) code and folders. Altered UCASE and LCASE routines to be faster in some situations for us.
49 lines
2 KiB
Plaintext
49 lines
2 KiB
Plaintext
The {{KW|_SCREENIMAGE}} function stores the current desktop image or a portion of it and returns a handle value to reference.
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{{PageSyntax}}
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:: handle& = _SCREENIMAGE[(''column1'', ''row1'', ''column2'', ''row2'')]
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{{PageDescription}}
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* The handle& value is the desktop image reference in memory of the present user's desktop.
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* The optional screen ''column'' and ''row'' positions can be used to get only a portion of the desktop image.
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* The desktop image or partial image is always a 32-bit image.
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* The current screen resolution or width-to-height aspect ratio can be measured using the handle with [[_WIDTH (function)|_WIDTH]] and [[_HEIGHT]].
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* Can be used to take screen shots of the desktop or used with [[_PRINTIMAGE]] to print them.
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* It is IMPORTANT to free unused or uneeded image handles with [[_FREEIMAGE]] to prevent memory overflow errors!
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* [[Keywords_currently_not_supported_by_QB64#Keywords_Not_Supported_in_Linux_or_MAC_OSX_versions|Keyword Not Supported in Linux or MAC versions]]
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''Example:'' Determining the present screen resolution of user's PC for a screensaver program.
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{{CodeStart}}
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desktop& = {{Cl|_SCREENIMAGE}}
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MaxScreenX& = {{Cl|_WIDTH (function)|_WIDTH}}(desktop&)
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MaxScreenY& = {{Cl|_HEIGHT}}(desktop&)
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{{Cl|_FREEIMAGE}} desktop& 'free image after measuring screen(it is not displayed)
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{{Cl|SCREEN (statement)|SCREEN}} {{Cl|_NEWIMAGE}}(MaxScreenX&, MaxScreenY&, 256) 'program window is sized to fit '' ''
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{{Cl|_SCREENMOVE}} _MIDDLE
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{{CodeEnd}}
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''Screen image savers:''
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*{{KW|SAVEIMAGE}} (QB64 Image to Bitmap SUB by Galleon)
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*{{KW|Program ScreenShots}} (Member program for legacy screen modes)
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* {{KW|ThirtyTwoBit SUB}} (QB64 Image area to bitmap)
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{{PageSeeAlso}}
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* [[_SCREENCLICK]], [[_SCREENPRINT]]
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* [[_SCREENMOVE]], [[_SCREENX]], [[_SCREENY]]
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* [[_WIDTH (function)|_WIDTH]], [[_HEIGHT]]
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* [[_FULLSCREEN]], [[_PRINTIMAGE]]
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* [[SAVEIMAGE]] {{text|(save image to bitmap program)}}
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* [[Screen Saver Programs]]
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{{PageNavigation}} |