Fixed a BUG of VC++ 6.0

最新推荐文章于 2025-04-20 03:30:00 发布

ThinkHY

最新推荐文章于 2025-04-20 03:30:00 发布

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分类专栏： Windows编码 VC++ 文章标签： vc++ documentation microsoft function reference class

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本文介绍了一个CFileFind::GetLength64()函数的问题，该函数对于大于4GB的文件返回错误的32位数值。提供了一个解决方案：创建CMyFtpFileFind类继承自CFtpFileFind，并正确实现GetLength64()方法。

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MSDN documentation states that for files larger than 4 gigabytes,there is the CFileFind::GetLength64() function that returns the size as 64Bit number.But the function just return a wrong 32Bit number. Damn Microsoft!

Solution: write a derived class(CMyFtpFileFind) from CFtpFileFind,and implementing the GetLength64() member function correctly. Replace this derived class with CFtpFileFind.

Reference: http://www.codeproject.com/KB/bugs/getlength64bug.asp.aspx?print=true

Last version: https://gist.github.com/978421

Source code as following text:

class CMyFtpFileFind : public CFtpFileFind
{
public:
    CMyFtpFileFind(CFtpConnection* pConnection, DWORD dwContext = 1) : CFtpFileFind(pConnection, dwContext)
    {
    }

    virtual ~CMyFtpFileFind() { }

    __int64 GetLength64() const
    {
        ASSERT(m_hContext != NULL);
        ASSERT_VALID(this);
        unsigned __int64 uRet = 0;

        if (m_pFoundInfo != NULL)
        {
            unsigned __int64 uFileSizeLow = ((LPWIN32_FIND_DATA) m_pFoundInfo)->nFileSizeLow;
            unsigned __int64 uFileSizeHigh = ((LPWIN32_FIND_DATA) m_pFoundInfo)->nFileSizeHigh;
            uRet = uFileSizeLow + (uFileSizeHigh << 32);
        }

        return uRet;
    }

}; // CMyFtpFileFind