A SendAsyncProc function is an application-defined callback function that the operating system calls when the SendMessageCallback function is called. The system passes the message to the callback function after passing the message to the destination window procedure. A value of type SENDASYNCPROC is a pointer to such a function.
VOID CALLBACK SendAsyncProc(
HWND hwnd, |
// handle of destination window |
UINT uMsg, |
// message |
DWORD dwData, |
// application-defined value |
LRESULT lResult |
// result of message processing |
); |
If the SendMessageCallback
function was called with its hwnd parameter set to HWND_BROADCAST, the
operating system calls the SendAsyncProc function once for each
top-level window.
This callback function does not return a value.
SendAsyncProc is a placeholder for an application-defined function name.
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.
GetMessage, PeekMessage, SendMessageCallback, WaitMessage
file: /Techref/os/win/api/win32/func/src/f75_12.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/10/7 14:32,
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