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