LRESULT CALLBACK onMsgOld (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam); LRESULT CALLBACK myMsg (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { if (message == WM_DESTROY) { // do whatwever you need at window destroying time } return onMsgOld(hwnd, message, wParam, lParam); } void main () { onMsgOld = on_message; on_message = myMsg; ...
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