Update TabWindow.cpp #338
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Update TabWindow.cpp #338
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In project Windows-classic-samples/Samples/Win7Samples/multimedia/DirectWrite/HelloWorld, when processing message == WM_CREATE in TabWindow::WndProc(...), TabWindow fails to save its USERDATA with a ::SetWindowLongPtrW(hwnd, GWLP_USERDATA, PtrToUlong(pTabWindow)) call (file TabWindow.cpp, line 286), and consequently fails to initialize pTabWindow when processing later the WM_SIZE message. As the debugger reports an access violation exception in the _SCRT_STARTUP_WWINMAIN-branch routine, the error is hard to identify for beginner programmers. Use a standard-compliant reinterpret_cast<LONG_PTR>(pTabWindow).
zhuman
approved these changes
Aug 23, 2024
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In project Windows-classic-samples/Samples/Win7Samples/multimedia/DirectWrite/HelloWorld, when processing message == WM_CREATE in TabWindow::WndProc(...), TabWindow fails to save its USERDATA with a ::SetWindowLongPtrW(hwnd, GWLP_USERDATA, PtrToUlong(pTabWindow)) call (file TabWindow.cpp, line 286), and consequently fails to initialize pTabWindow when processing later the WM_SIZE message.
As the debugger reports an access violation exception in the _SCRT_STARTUP_WWINMAIN-branch routine, the error is hard to identify for beginner programmers.
Use a standard-compliant reinterpret_cast<LONG_PTR>(pTabWindow).