Window subclassing is trickier than you think. Consider this code sketch:
// Subclass the window for a little while WNDPROC OldWndProc = SubclassWindow(hwnd, NewWndProc); ... do stuff ... // Okay all done, remove our subclass by // restoring the previous window procedure SubclassWindow(hwnd, OldWndProc);
What could go wrong? We’ll discuss it tomorrow.
Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.
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