SendMessage/PostMessage

Hi
This code closes the window with PostMessage.
But if i write SendMesssage instead of Post message it doesn't close the window.I don't understand why it is so.

Code:

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  HWND h=::FindWindow(NULL,L"Tutorial: A Simple Window - Mozilla Firefox");
  PostMessage(h,WM_QUIT,0,0);

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What are the differences so postmessage can close the window but postmessage can not.
Thanks

Never post/send a WM_QUIT. Always post/send a WM_CLOSE message instead.
The reason it doesn't work is probably answered here.. which is , WM_QUIT message has to be processed by GetMessage, however, SendMessage bypasses this.

Anyways, refrain from send/posting WM_QUIT. WM_CLOSE is the recommended approach to close a window. If not, you might bypass other stuff the application would typically do when closing a window.

Quote:

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What are the differences so postmessage can close the window but postmessage can not

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Quote:

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Originally Posted by MSDN

The SendMessage function 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.

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Quote:

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Originally Posted by MSDN

The PostMessage function places (posts) a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message.

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Now, you should undestand better what Kiran said (as specified in MSDN)

Quote:

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Originally Posted by MSDN

The WM_QUIT message is not associated with a window and therefore will never be received through a window's window procedure. It is retrieved only by the GetMessage or PeekMessage functions.

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ok.
Thanks friends for help...

Hi All

I want to close another programm from my programm:

Code:

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  SendMessage(hMw,WM_CLOSE,0,0);

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And it works ...

But if another programm is Minimized, it's not closed. Only after the second start of my program it's closed.

Why...?
I don't understand.

Quote:

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I don't understand.

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I don't undestand this either:

Quote:

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after the second start of my program it's closed.

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I think he means... if the program he wants to close is minimized, running his program once will not close it. But, running his program a second time will close it.

Yes I meant it.

I badly know English. Sorry...

Why SendMessage ? Why not PostMessage ? ( SendMessage will tie up the sender if , for some reason, the target process is hung ). Instead, use PostMessage, or SendMessageTimeout.

Also, how are you obtaining the hWnd ? Are you sure you are getting the right hWnd ?

PostMessage does not work too.

SendMessageTimeout did't try. I do not know parameter - fuFlags.

Yes Window handle is right. First time it's working.

SendMessageTimeout does not work too.

Maybe i send wrong parameters !?

Code:

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  hMw = FindWindowEx (NULL,NULL,"WindowsForms10.Window.8.app17",NULL);
  SendMessageTimeout(hMw,WM_CLOSE,0,0,0,200,0);

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