SendMessageCallback function

Sends the specified message to a window or windows. It calls the window procedure for the specified window and returns immediately if the window belongs to another thread. After the window procedure processes the message, the system calls the specified callback function, passing the result of the message processing and an application-defined value to the callback function.

Syntax

BOOL WINAPI SendMessageCallback(
  _In_ HWND          hWnd,
  _In_ UINT          Msg,
  _In_ WPARAM        wParam,
  _In_ LPARAM        lParam,
  _In_ SENDASYNCPROC lpCallBack,
  _In_ ULONG_PTR     dwData
);

Parameters

hWnd [in]

Type: HWND

A handle to the window whose window procedure will receive the message. If this parameter is HWND_BROADCAST ((HWND)0xffff), the message is sent to all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows; but the message is not sent to child windows.

Msg [in]

Type: UINT

The message to be sent.

For lists of the system-provided messages, see System-Defined Messages.

wParam [in]

Type: WPARAM

Additional message-specific information.

lParam [in]

Type: LPARAM

Additional message-specific information.

lpCallBack [in]

Type: SENDASYNCPROC

A pointer to a callback function that the system calls after the window procedure processes the message. For more information, see SendAsyncProc.

If hWnd is HWND_BROADCAST ((HWND)0xffff), the system calls the SendAsyncProc callback function once for each top-level window.

dwData [in]

Type: ULONG_PTR

An application-defined value to be sent to the callback function pointed to by the lpCallBack parameter.

Return value

Type:

Type: BOOL

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

If the target window belongs to the same thread as the caller, then the window procedure is called synchronously, and the callback function is called immediately after the window procedure returns. If the target window belongs to a different thread from the caller, then the callback function is called only when the thread that called SendMessageCallback also calls GetMessage, PeekMessage, or WaitMessage.

If you send a message in the range below WM_USER to the asynchronous message functions (PostMessage, SendNotifyMessage, and SendMessageCallback), its message parameters cannot include pointers. Otherwise, the operation will fail. The functions will return before the receiving thread has had a chance to process the message and the sender will free the memory before it is used.

Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage function to obtain a unique message for inter-application communication.

The system only does marshalling for system messages (those in the range 0 to (WM_USER-1)). To send other messages (those >= WM_USER) to another process, you must do custom marshalling.

Requirements

See also

Reference

PostMessage

RegisterWindowMessage

SendAsyncProc

SendMessageCallback

SendNotifyMessage

Conceptual

Messages and Message Queues