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SendMessage.md

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Function name : SendMessage

Group: Message and Message Queue - Library: user32

Sends the specified message to a window or windows. It calls the window procedure for the specified window and does not return until the window procedure has processed the message.

Code examples:

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Declaration:

LRESULT SendMessage(
  HWND hWnd,      // handle to destination window
  UINT Msg,       // message
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

FoxPro declaration:

DECLARE INTEGER SendMessage IN user32;
	INTEGER hWnd,;
	INTEGER Msg,;
	INTEGER wParam,;
	INTEGER lParam

Parameters:

hWnd [in] Handle to the window whose window procedure will receive the message.

Msg [in] Specifies the message to be sent.

wParam [in] Specifies additional message-specific information.

lParam [in] Specifies additional message-specific information.

Return value:

The return value specifies the result of the message processing; it depends on the message sent.

Comments:

To send a message and return immediately, use the SendMessageCallback or SendNotifyMessage function. To post a message to the message queue of a thread and return immediately, use the PostMessage or PostThreadMessage function.