A simple, small calculator placed discreetly near the Windows Taskbar or anywhere on the screen
fix: destroy calculator window before deleting it on exit
CWindowImpl asserts (m_hWnd must be NULL) if the C++ object is deleted while
its HWND is still alive. On Exit the window was only ever hidden (WM_CLOSE),
never destroyed, so 'delete g_calc' tripped the ATL debug assertion. Destroy
the window first.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Marco Maroni
(Jul 14, 2026, 3:52 PM +0200)
2345eb72
8a659fe8
+6
-2
+6
-2
App.cpp
+6
-2
App.cpp
···
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TranslateMessage(&m);
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DispatchMessage(&m);
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}
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-
delete g_calc;
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-
g_calc = nullptr;
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+
if (g_calc) {
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+
if (g_calc->IsWindow())
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+
g_calc->DestroyWindow();
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+
delete g_calc;
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+
g_calc = nullptr;
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+
}
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if (mutex) { ReleaseMutex(mutex); CloseHandle(mutex); }
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return (int)m.wParam;
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}