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Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage
function to obtain a unique message for inter-application communication.
If you send a message in the range below WM_USER to the asynchronous message functions (PostMessage,
SendNotifyMessage, and SendMessageCallback), make sure that the message parametersdo
not include
pointers. Otherwise, the functions will return before the receiving thread has had a chance to process
the message and the sender will free the memory before it is used.
Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage
function to obtain a unique message for inter-application communication.
If you send a message in the range below WM_USER to the asynchronous message functions (PostMessage,
SendNotifyMessage, and SendMessageCallback), make sure that the message parametersdo
not include
pointers. Otherwise, the functions will return before the receiving thread has had a chance to process
the message and the sender will free the memory before it is used.