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並前往https://www.vbforums.com/showthread.php?323402-WM_MOUSEWHEEL-undeclared-identifier

Thread: WM_MOUSEWHEEL : undeclared identifier - VBForums

... #endif #if (_WIN32_WINNT >= 0x0500) #define WM_XBUTTONDOWN 0x020B #define WM_XBUTTONUP 0x020C #define WM_XBUTTONDBLCLK 0x020D #endif.

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