_SCREENIMAGE

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The _SCREENIMAGE function stores the current desktop image or a portion of it and returns an image handle.


Syntax

imageHandle& = _SCREENIMAGE(column1, row1, column2, row2)]


Description

  • imageHandle& is the handle to the new image in memory that will contain the desktop screenshot.
  • The optional screen column and row positions can be used to get only a portion of the desktop image.
  • The desktop image or partial image is always a 32-bit image.
  • The current screen resolution or width-to-height aspect ratio can be obtained with _DESKTOPWIDTH and _DESKTOPHEIGHT.
  • Can be used to take screenshots of the desktop or used with _PRINTIMAGE to print them.
  • It is important to free unused or uneeded image handles with _FREEIMAGE to prevent memory overflow errors.
  • Keyword not supported in Linux or macOS versions


Examples

Example: Determining the present screen resolution of user's PC for a screensaver program.

 desktop& = _SCREENIMAGE
 MaxScreenX& = _WIDTH(desktop&)
 MaxScreenY& = _HEIGHT(desktop&)
 _FREEIMAGE desktop& 'free image after measuring screen(it is not displayed)
 SCREEN _NEWIMAGE(MaxScreenX&, MaxScreenY&, 256) 'program window is sized to fit
 _SCREENMOVE _MIDDLE


Sample code to save images to disk


See also



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