Answer to previous exercise about the mythical WM_MOUSEENTER message

Raymond Chen October 14, 2003 Oct 14, 2003 10/14/03

If the program starts with the mouse already in the client area without moving, why do you get a beep?

Why is there no WM_MOUSEENTER message?

Raymond Chen October 13, 2003 Oct 13, 2003 10/13/03

There is a WM_MOUSELEAVE message. Why isn't there a WM_MOUSEENTER message? Because you can easily figure that out for yourself. When you receive a WM_MOUSELEAVE message, set a flag that says, "The mouse is outside the window." When you receive a WM_MOUSEMOVE message and the flag...

Other uses for bitmap brushes

Raymond Chen October 9, 2003 Oct 9, 2003 10/9/03

Bitmap brushes used to be these little 8x8 monochrome patterns that you could use for hatching and maybe little houndstooth patterns if you were really crazy. But you can do better. CreatePatternBrush lets you pass in any old bitmap - even a huge one, and it will create a brush from it. ...

Stupid memory-mapping tricks

Raymond Chen October 7, 2003 Oct 7, 2003 10/7/03

Shared memory is not just for sharing memory with other processes. It also lets you share memory with yourself in sneaky ways. For example, this sample program (all error checking and cleanup deleted for expository purposes) shows how you can map the same shared memory into two locations ...