1、DWORD dwFileSizeHigh; // 得到文件大小的高位
__int64 qwFileSize = GetFileSize(m_hSrcBigFile, &dwFileSizeHigh);
qwFileSize |= (((__int64)dwFileSizeHigh)<<32);//高位左移32位,或上低位,组成整个文件的大小
2、ULARGE_INTEGER tInt1;
tInt1.LowPart = GetFileSize(tHandle, &tInt1.HighPart);
__int64 tFileSize1 = tInt1.QuadPart;
3、LARGE_INTEGER tInt2;
GetFileSizeEx(tHandle, &tInt2);
__int64 tFileSize2 = tInt2.QuadPart;