SetMessageExtraInfo

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
);
 

Parameters

lParam

Specifies the 32-bit value to associate with the current thread.

Return Values

The return value is the previous 32-bit value.

QuickInfo

  Windows NT: Requires version 3.51 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.
  Import Library: Use user32.lib.

See Also

Messages and Message Queues Overview, Message and Message Queue Functions, GetMessageExtraInfo