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small "BUTTON" problem

Started by Progames25 Feb 28, 2009 at 7:27 PM 2 replies 1.1k views

Original Post

Feb 28, 2009 at 7:27 PM

(using C++ Win32 API) Hello, I have one button in my window. I can't figure out how to make a MessageBox() show if you press this button. I named the HWND for my button hWndButtonSave. The closest I have gotten to figuring out if the button was pressed was creating a: case WM_COMMAND: break; inside of winproc. How can I tell if a certain button was pressed, and then do something (MessageBox()) when it is pressed? I ahve looked all over google, Win32 Tips, and other places and just can't find how to do this. Thanks, Progames25

MJP

Feb 28, 2009 at 7:52 PM

When you create a control (or any other child window) with CreateWindow or CreateWindowEx, you give it an ID via the hMenu parameter. When the control sends a WM_COMMAND, the ID is sent as the low-word of the wParam. You can check this ID to determine which control sent the notification. The lParam is the handle to the control window, so you can also check this against the HWND you received from CreateWindow when you created the Button.

Make sure you also check the notification code, which in the high-word of wParam. In your case you'll want to make sure the code is BN_CLICKED, which indicates that the button was clicked.

Endurion

Mar 1, 2009 at 12:59 AM

As MJP said.

MSDN should have a nice sample when you look for BN_CLICKED. It boils down to:

case WM_COMMAND:  if ( HIWORD( wParam ) == BN_CLICKED )  {    // either check the ID    if ( LOWORD( wParam ) == myID )    {      // do action    }    // ... or the HWND    if ( (HWND)lParam == hwndMyButton )    {      // do action    }  }  break;

Progames25

Mar 1, 2009 at 9:29 PM

Awsome,
thanks it worked.
now I get it.

Thanks,
Progames25

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