nf-winuser-setmessageextrainfo.md

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NF:winuser.SetMessageExtraInfo	SetMessageExtraInfo function (winuser.h)	Sets the extra message information for the current thread.	SetMessageExtraInfo SetMessageExtraInfo function [Windows and Messages] _win32_SetMessageExtraInfo _win32_setmessageextrainfo_cpp winmsg.setmessageextrainfo winui._win32_setmessageextrainfo winuser/SetMessageExtraInfo	winmsg\setmessageextrainfo.htm	winmsg	VS|winui|~\winui\windowsuserinterface\windowing\messagesandmessagequeues\messagesandmessagequeuesreference\messagesandmessagequeuesfunctions\setmessageextrainfo.htm	12/05/2018	SetMessageExtraInfo, SetMessageExtraInfo function [Windows and Messages], _win32_SetMessageExtraInfo, _win32_setmessageextrainfo_cpp, winmsg.setmessageextrainfo, winui._win32_setmessageextrainfo, winuser/SetMessageExtraInfo	winuser.h	Windows.h	Windows	Windows 2000 Professional [desktop apps only]	Windows 2000 Server [desktop apps only]										User32.lib	User32.dll		Windows			19H1	SetMessageExtraInfo winuser/SetMessageExtraInfo	c++	APIRef kbSyntax	DllExport	User32.dll API-MS-Win-RTCore-NTUser-Window-l1-1-0.dll minuser.dll Ext-MS-Win-RTCore-NTUser-Window-Ext-l1-1-0.dll	SetMessageExtraInfo	ext-ms-win-ntuser-message-l1-1-0 (introduced in Windows 8)

SetMessageExtraInfo function

-description

Sets 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. An application can use the GetMessageExtraInfo function to retrieve a thread's extra message information.

-parameters

-param lParam [in]

Type: LPARAM

The value to be associated with the current thread.

-returns

Type: LPARAM

The return value is the previous value associated with the current thread.

-see-also

Conceptual

GetMessageExtraInfo

Messages and Message Queues

Reference