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I remember reading somewhere that a way to get a windows hook into another process is to add your dll to the APIEntry list or something like that, and whenever a process is started, the dll is loaded with it. through that you can subclass and do whatever. is this how spy++ works? if it is, can someone direct me as to how to make such a dll? thanks.
What are you trying to do anyways? Just curious.... I probably won't be able to help you much....
If you just want to subclass some programs Window procedure try calling SetWindowLong and replace the window proc with your own.
-Futura
Yes. The technique is called DLL Hooking. Jeffrey Richter demostrate DLL Hooking in his book.
Programming Applications for Microsoft Windows by Jeffrey Richter
Kuphryn
thanks kuphryn. codulation, windows prevents a process modifying the memory space of another process, so i cant just use SetWindowLong. Plus, how would i get the window handle? But it would be good if that method works, its nice and easy.
Aw, c'mon don't give up so easily. You can get the window's handle with FindWindow() or EnumDesktopWindows()
Then use DebugActiveProcess() to attatch to it- presto, you've got access to the process like it's your own and can freely use SetWindowLong(). BTW, this won't work with NT, 2k and up if the security descriptor for the target process don't allow debugging.