Changing X

How would a person change the "x" to minmize the application instead of closing it?

Just override the WM_CLOSE message.

Code:

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
{
	switch (uMsg)
	{
		case WM_CLOSE:
		{
			ShowWindow(hwnd, SW_MINIMIZE);
			return 0; /* Don't call DefWindowProc, which would call DestroyWindow. */
		}
	}

	return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

Thank-you anonytmouse for the reply, but I did try to play with the WM_CLOSE and it did not seem to work for me. Perhaps I was using the wrong coding.

Anyway, I did come up with a resolve. Since the program that I am building minimizes to the system tray, and it is a toolbar window, I accessed the WM_SYSCOMMAND. Here is the code that I came up with:

Code:

case WM_SYSCOMMAND:
      if (LOWORD (wParam) == SC_CLOSE) {
            SendMessage(hWnd,WM_SIZE,SIZE_MINIMIZED,NULL);
            return 1;
      }
      break;

Now everytime the toolbar "x" is used the application minimizes to the system tray. Within the WM_SIZE I have a call to a procedure that sets up the icon.

Code:

case WM_SIZE:
     if(wParam==SIZE_MINIMIZED) {
          ShowWindow(hWnd,SW_HIDE);
          NotifySysIcon(hWnd,IDI_ICON,ToolTip,NIM_MODIFY);
     }
     else if(wParam==SIZE_RESTORED) {
          ShowWindow(hWnd,SW_NORMAL);
          NotifySysIcon(hWnd,IDI_ICON1,ToolTipNew,NIM_MODIFY);
     }
     break;

And just for completion sake, here is the NotifySysIcon proc:

Code:

int NotifySysIcon (HWND hWnd,int IconNum,PSTR ToolTip,DWORD NimType)
{
     Nicon.cbSize=sizeof(NOTIFYICONDATA);
     Nicon.hIcon = LoadIcon(hInst,MAKEINTRESOURCE(IconNum));
     Nicon.hWnd = hWnd;
     Nicon.uFlags = NIF_ICON|NIF_MESSAGE|NIF_TIP;	
     Nicon.uCallbackMessage = WM_TRAYMESSAGE;		
     Nicon.uID = ICONIDENT;
     strcpy(Nicon.szTip,ToolTip);
     Shell_NotifyIcon(NimType,&Nicon);
	
     return 0;
}

Hopefully this will be useful to someone.