_SCREENIMAGE - mkilgore/QB64pe GitHub Wiki

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

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

• 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 MAC versions

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

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

• SAVEIMAGE
• Program ScreenShots (member-contributed program for legacy screen modes)
• ThirtyTwoBit SUB
• SaveIcon32

• _SCREENCLICK, _SCREENPRINT
• _SCREENMOVE, _SCREENX, _SCREENY
• _WIDTH, _HEIGHT
• _DESKTOPWIDTH, _DESKTOPHEIGHT
• _FULLSCREEN, _PRINTIMAGE
• Screen Saver Programs
• Bitmaps, Icons and Cursors
• Hardware images