Which Form event to use to clean up before shutting down?

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I'm using Visual C++.NET. When the user clicked on the X in the upper right corner of my gui, I want to close my files and sockets before the gui terminates. Which form event would get triggered when the X is clicked? I don't know where to find the list of available Form events. In VB 6.0, Form_Terminate, Form_Unload, or Form_QueryUnload are events that may be used.

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Sep 30th, 2005

Re: Which Form event to use to clean up before shutting down?

WM_CLOSE (specifically when the X button is clicked)
WM_DESTROY (when the window is destroyed)

Example of a Dialog:

(Toggle Plain Text)

BOOL CALLBACK ExampleDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)


{switch (message){

case WM_INITDIALOG:

{// Almost like the dialogs constructor return TRUE; //Dialog will stay visible
} 
case WM_CLOSE:  


{// Do stuff before closing the dialogEndDialog(hDlg, IDCANCEL);
break;

}
return FALSE;

 
}

NOTE: the EndDialog usage passes in IDCANCEL. Becuase the WM_COMMAND case is not shown in this example, most likly you would pass in a 0 or 1 instead of IDCANCEL.

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