Deleting a Window Property

When a window is destroyed, it must destroy any window properties it set. The following example uses the EnumPropsEx function and the application-defined callback function DelPropProc to destroy the properties associated with the window identified by the application-defined hwndSubclass variable. The callback function, which uses the RemoveProp function, is also shown.

case WM_DESTROY:

EnumPropsEx(hwndSubclass, DelPropProc, NULL);

PostQuitMessage(0);

break;

// DelPropProc is an application-defined callback function

// that deletes a window property.

BOOL CALLBACK DelPropProc(

HWND hwndSubclass, // handle of window with property

LPCSTR lpszString, // property string or atom

HANDLE hData) // data handle

{

RemoveProp(hwndSubclass, lpszString);

return TRUE;

}

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