C++-FindFirstFile findnextfile 读取文件属性 并计算文件大小，为什么超过2G的文件大小就计算错误啊？

Question

2013/03/22 08:22 -1218121728 bytes rhel-5.2-server-i386-dvd.iso
实际大小为2.86G
使用计算方法为

int list_current_dir( )
{
    WIN32_FIND_DATA FileData;
    HANDLE hSearch = NULL;  
    
    hSearch = FindFirstFile("c:\*", &FileData);  // find for all files
    if(hSearch == INVALID_HANDLE_VALUE)
        return 0;   // No file found

    do
    {
    SYSTEMTIME systime;
    FileTimeToSystemTime(&FileData.ftLastWriteTime,&systime);
    unsigned __int64 filesize = FileData.nFileSizeHigh * 0ffffffff + FileData.nFileSizeLow;

        printf("%04d/%02d/%02d %02d:%02d  %l64u  %sn", systime.wYear, systime.wMonth,systime.wDay,systime.wHour, systime.wMinute,filesize,FileData.cFileName);// print file name
    }while(FindNextFile(hSearch,&FileData));// find next file

    FindClose(hSearch);  // finish searching
    return 1;
}

Answer 1

unsigned __int64 filesize = FileData.nFileSizeHigh * 0ffffffff + FileData.nFileSizeLow;
这句话有问题，改成这样试试：
uint64 ret = (((uint64)(FileData.nFileSizeHigh)) << 32) + (uint64)FileData.nFileSizeLow;

Answer 2

无代码，不真相，初测是否数组越界、未初始化等