This topic pertains only to application development in C and C++. See DirectDraw Visual Basic Samples.

Description

This sample program shows how to directly lock and access video memory, using text generated from a GDI font. There are much better ways to draw text into a DirectDrawSurface, and the only point of this sample is to show exactly how to lock and access the video memory directly.

Path

Source: (SDK root)\Samples\Multimedia\DDraw\Src\Font

Executable: (SDK root)\Samples\Multimedia\DDraw\Bin\Font.exe

User's Guide

The program repeatedly updates a text string in the Arial font and moves it randomly about the screen. No user input is required. Quit by closing the window.

Programming Notes

The program creates a font in a memory device context and a DIB section, and uses them to get access to the pixels once GDI has drawn them. The text bitmap is then put on the primary surface with a straight memory copy. It could easily be moved instead to an off-screen surface which could then be blitted as needed, transparently or not.