Creating Windows in Threads - Win32 Programmer's Reference

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Creating Windows in Threads

Any thread can create a window. The thread that creates the window owns the window and its associated message queue. Therefore, the thread must provide a message loop to process the messages in its message queue. In addition, you must use MsgWaitForMultipleObjects or MsgWaitForMultipleObjectsEx in that thread, rather than the other wait functions, so that it can process messages. Otherwise, the system can become deadlocked when the thread is sent a message while it is waiting.

The AttachThreadInput function can be used to allow a set of threads to share the same input state. By sharing input state, the threads share their concept of the active window. By doing this, one thread can always activate another thread's window. This function is also useful for sharing focus state, mouse capture state, keyboard state, and window Z-order state among windows created by different threads whose input state is shared.

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