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    copied!<p>Multi-threading and message queuing is quite a complex game. When you SendMessage from ThreadA to the same thread then it just calls the message handler. If you do it from ThreadA to another thread (ThreadB) then it gets more complicated. ThreadA then posts a message to the ThreadB's message queue and waits on a signal to say that ThreadB has finished processing the message and sent the return value. This raises an instant problem. If ThreadB is not pumping messages then you have a deadlock as the message in ThreadB's will never get "dispatched". This also raises an EVEN bigger problem. If ThreadB's message needs to send a message to a control created in ThreadA then you have a massive architectural problem. As ThreadA is currently suspended waiting for ThreadB to return and ThreadB is suspended waiting for ThreadA to return. Nothing will happen ... They will both sit suspended.</p> <p>Thats about it really. Its pretty easy as long as you bear these issues in mind. ie It absoloutely IS possible despite what the others have said.</p> <p>In general though your threading is pretty pointless because you straight away send a message to the main thread to do some processing. Why bother starting the threads in the first place. You may as well not bother because the threads will just sit there waiting for the main thread to return.</p> <p>Why do you "WaitForSingleObject" anyway when you suspend the first thread? Why not just suspend them both.</p> <p>All round, though, you aren't giving enough information about what you are doing to say exactly whats going on. What happens when you click pause, for example?</p>
 

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