From QB64 Wiki
The _SCREENIMAGE function stores the current desktop image or a portion of it and returns a handle value to reference.
- handle& = [[_SCREENIMAGE](column1, row1, column2, row2)]
- The handle& value is the desktop image reference in memory of the present user's desktop.
- 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 measured using the handle with _WIDTH and _HEIGHT.
- Can be used to take screen shots 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(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
Screen image savers:
- SAVEIMAGE (QB64 Image to Bitmap SUB by Galleon)
- Program ScreenShots (Member program for legacy screen modes)
- ThirtyTwoBit SUB (QB64 Image area to bitmap)
- SaveIcon32 (converts any image to icon)
- _SCREENCLICK, _SCREENPRINT
- _SCREENMOVE, _SCREENX, _SCREENY
- _WIDTH, _HEIGHT
- _FULLSCREEN, _PRINTIMAGE
- SAVEIMAGE (save image to bitmap program)
- Screen Saver Programs
- Bitmaps, Icons and Cursors
- Hardware images