ON_THREAD_MESSAGE
Visual Studio 2010
Indicates which function will handle a user-defined message.
ON_THREAD_MESSAGE(message, memberFxn )
ON_THREAD_MESSAGE must be used instead of ON_MESSAGE when you have a CWinThread class. User-defined messages are any messages that are not standard Windows WM_MESSAGE messages. There should be exactly one ON_THREAD_MESSAGE macro statement in your message map for every user-defined message that must be mapped to a message-handler function.
