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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}} |