Fixed a BUG of VC++ 6.0

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