Windows 3.1 Device Drivers (ddag31qh.hlp) (Table of Contents; Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Display Grabbers
                                                     Up Next Previous
────────────────────────────────────────────────────────────────────────────
 
The Microsoft Windows display grabbers provide the support that both
standard- and 386 enhanced-mode Windows needs to share the display with
non-Windows applications. WINOLDAP, which manages all non-Windows
applications, loads the display grabbers and calls grabber functions to
carry out tasks such as capturing the contents of the screen or managing
output from a non-Windows application.
 
The following topics provide useful information about display grabbers:
 
About the Display Grabbers
About the Standard-Mode Display Grabber
    Standard and Extended Functions
    Standard-Function Dispatch Table
    Extended-Function Dispatch Table
    Coordinate System
    Buffer-Size Calculations
    Binary Image File
About the Enhanced-Mode Grabber
    Initialization
    Window Painting and Updating
    Virtual-Display Device Services
    On-Screen Selection
    Screen Captures
Display Grabber Functions and Structures