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並前往https://books.google.com.tw/books?id=PqZWF1dfb1AC&pg=PA865&lpg=PA865&dq=wm_lbuttondown&source=bl&ots=8qS9aCsEnD&sig=ACfU3U1Drxm6qQrfFeQWQGaKHqAHGsmBig&hl=zh-TW&sa=X&ved=2ahUKEwiyu_Litb30AhVkxosBHXcSAogQ6AF6BQidAhAD

Ivor Horton's Beginning Visual C++ 2008 - 第 865 頁 - Google 圖書結果

It's quite possible for a window to receive a WM_LBUTTONUP message without having previously received a WM_LBUTTONDOWN message.

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