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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| WinNT
| Platform Notes
| None
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SendMessage
The SendMessage function sends the specified message to a window or windows. The function
calls the window procedure for the specified window and does not return until the
window procedure has processed the message. The PostMessage function, in contrast, posts a message to a thread's message queue and
returns immediately.
LRESULT SendMessage(
HWND hWnd,
| // handle of destination window
| UINT Msg,
| // message to send
| WPARAM wParam,
| // first message parameter
| LPARAM lParam
| // second message parameter
| );
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Parameters
hWnd
Identifies the window whose window procedure will receive the message. If this
parameter is HWND_BROADCAST, 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
Specifies the message to be sent.
wParam
Specifies additional message-specific information.
lParam
Specifies additional message-specific information.
Return Values
The return value specifies the result of the message processing and depends on
the message sent.
Remarks
Applications that need to communicate using HWND_BROADCAST should use the RegisterWindowMessage function to obtain a unique message for inter-application communication.
If the specified window was created by the calling thread, the window
procedure is called immediately as a subroutine. If the specified window was created by
a different thread, Windows switches to that thread and calls the appropriate
window procedure. Messages sent between threads are processed only when the
receiving thread executes message retrieval code. The sending thread is blocked
until the receiving thread processes the message.
See Also
InSendMessage, PostMessage, RegisterWindowMessage, SendDlgItemMessage
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