SENDASYNCPROC callback function (winuser.h)
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.
Syntax
SENDASYNCPROC Sendasyncproc;
void Sendasyncproc(
HWND unnamedParam1,
UINT unnamedParam2,
ULONG_PTR unnamedParam3,
LRESULT unnamedParam4
)
{...}
Parameters
unnamedParam1
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.
unnamedParam2
Type: UINT
The message.
unnamedParam3
Type: ULONG_PTR
An application-defined value sent from the SendMessageCallback function.
unnamedParam4
Type: LRESULT
The result of the message processing. This value depends on the message.
Return value
None
Remarks
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.
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) |
See also
Conceptual
Reference