GetMessageExtraInfo function (winuser.h)

Retrieves the extra message information for the current thread. Extra message information is an application- or driver-defined value associated with the current thread's message queue.

Syntax

LPARAM GetMessageExtraInfo();

Return value

Type: LPARAM

The return value specifies the extra information. The meaning of the extra information is device specific.

Remarks

To set a thread's extra message information, use the SetMessageExtraInfo function.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	winuser.h (include Windows.h)
Library	User32.lib
DLL	User32.dll
API set	ext-ms-win-ntuser-window-l1-1-4 (introduced in Windows 10, version 10.0.14393)

See also

Conceptual

GetMessage

Messages and Message Queues

PeekMessage

Reference

SetMessageExtraInfo