nf-winuser-insendmessage.md

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NF:winuser.InSendMessage	InSendMessage function (winuser.h)	Determines whether the current window procedure is processing a message that was sent from another thread (in the same process or a different process) by a call to the SendMessage function.	InSendMessage InSendMessage function [Windows and Messages] _win32_InSendMessage _win32_insendmessage_cpp winmsg.insendmessage winui._win32_insendmessage winuser/InSendMessage	winmsg\insendmessage.htm	winmsg	VS|winui|~\winui\windowsuserinterface\windowing\messagesandmessagequeues\messagesandmessagequeuesreference\messagesandmessagequeuesfunctions\insendmessage.htm	12/05/2018	InSendMessage, InSendMessage function [Windows and Messages], _win32_InSendMessage, _win32_insendmessage_cpp, winmsg.insendmessage, winui._win32_insendmessage, winuser/InSendMessage	winuser.h	Windows.h	Windows	Windows 2000 Professional [desktop apps only]	Windows 2000 Server [desktop apps only]										User32.lib	User32.dll		Windows			19H1	InSendMessage winuser/InSendMessage	c++	APIRef kbSyntax	DllExport	User32.dll API-MS-Win-NTUser-IE-message-l1-1-0.dll ie_shims.dll API-MS-Win-RTCore-NTUser-Window-l1-1-0.dll minuser.dll Ext-MS-Win-NTUser-message-l1-1-0.dll Ext-MS-Win-NTUser-message-l1-1-1.dll Ext-MS-Win-RTCore-NTUser-Window-Ext-l1-1-0.dll Ext-MS-Win-NTUser-Message-l1-1-2.dll Ext-MS-Win-NTUser-Message-L1-1-3.dll	InSendMessage	ext-ms-win-ntuser-message-l1-1-0 (introduced in Windows 8)

InSendMessage function

-description

Determines whether the current window procedure is processing a message that was sent from another thread (in the same process or a different process) by a call to the SendMessage function.

To obtain additional information about how the message was sent, use the InSendMessageEx function.

-returns

Type: BOOL

If the window procedure is processing a message sent to it from another thread using the SendMessage function, the return value is nonzero.

If the window procedure is not processing a message sent to it from another thread using the SendMessage function, the return value is zero.

-see-also

Conceptual

InSendMessageEx

Messages and Message Queues

Reference

SendMessage