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NC:winuser.SENDASYNCPROC |
SENDASYNCPROC (winuser.h) |
An application-defined callback function used with the SendMessageCallback function. |
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winmsg\sendasyncproc.htm |
winmsg |
VS|winui|~\winui\windowsuserinterface\windowing\messagesandmessagequeues\messagesandmessagequeuesreference\messagesandmessagequeuesfunctions\sendasyncproc.htm |
12/05/2018 |
SendAsyncProc, SendAsyncProc callback, SendAsyncProc callback function [Windows and Messages], _win32_SendAsyncProc, _win32_sendasyncproc_cpp, winmsg.sendasyncproc, winui._win32_sendasyncproc, winuser/SendAsyncProc |
winuser.h |
Windows.h |
Windows |
Windows 2000 Professional [desktop apps only] |
Windows 2000 Server [desktop apps only] |
Windows |
19H1 |
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An application-defined callback function used with the SendMessageCallback function. The system passes the message to the callback function after passing the message to the destination window procedure. The SENDASYNCPROC type defines a pointer to this callback function. SendAsyncProc is a placeholder for the application-defined function name.
Type: HWND
A handle to the window whose window procedure received the message.
If the SendMessageCallback function was called with its hwnd parameter set to HWND_BROADCAST, the system calls the SendAsyncProc function once for each top-level window.
Type: UINT
The message.
Type: ULONG_PTR
An application-defined value sent from the SendMessageCallback function.
Type: LRESULT
The result of the message processing. This value depends on the message.
You install a SendAsyncProc application-defined callback function by passing a SENDASYNCPROC pointer to the SendMessageCallback function.
The callback function is only called when the thread that called SendMessageCallback calls GetMessage, PeekMessage, or WaitMessage.
Conceptual
Reference