The SetMessageExtraInfo function sets the extra message information for the current thread. Extra message information is an application- or driver-defined 32-bit value associated with the current thread’s message queue. An application can use the GetMessageExtraInfo function to retrieve a thread’s extra message information.
LPARAM SetMessageExtraInfo(
LPARAM lParam |
// application-defined 32-bit value |
); |
The return value is the previous 32-bit value.
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