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error 12003 while communicating with an ftp server
I am writing an ftp client using MFC. The particular server that my client is communicating with is A Bulletproof ftp server. I connect to the server by creating an CInternetSession object and then I call its member function GetFtpConnection. Randomly, the functions SetCurrentDirectory, OpenFile etc. does not succeed and return error code 12003. I read about that error in MSDN and found that the error 12003 could occur when the server is not a Microsoft server, since it sends back status messages that the MFC functions do not know how to handle. A solution is suggested: Set the flag INTERNET_FLAG_PASSIVE to FALSE and the server won't send any status messages. So my code looks like this now:
CInternetSession* m_pInternetSession = NULL;
try
{
m_pInternetSession = new CInternetSession(m_csAppna
INTERNET_FLAG_DONT_CACHE);
//m_pInternetSession->SetO
//m_pInternetSession->SetO
m_pFtpConnection = m_pInternetSession->GetFtp
m_pcsPassword, INTERNET_DEFAULT_FTP_PORT,
}
catch (CInternetException* pEx)
{
...
}
Before I read about the INTERNET_FLAG_PASSIVE, the code was identical except from the 5:th argument in GetFtpConnection. I have now added FALSE. Before I didn't even give a 5:th argument.
Still the server keeps sending the client messages that generates the error 12003, ie nothing changed when I set this flag.
Does anyone know how to handle this????
CInternetSession* m_pInternetSession = NULL;
try
{
m_pInternetSession = new CInternetSession(m_csAppna
INTERNET_FLAG_DONT_CACHE);
//m_pInternetSession->SetO
//m_pInternetSession->SetO
m_pFtpConnection = m_pInternetSession->GetFtp
m_pcsPassword, INTERNET_DEFAULT_FTP_PORT,
}
catch (CInternetException* pEx)
{
...
}
Before I read about the INTERNET_FLAG_PASSIVE, the code was identical except from the 5:th argument in GetFtpConnection. I have now added FALSE. Before I didn't even give a 5:th argument.
Still the server keeps sending the client messages that generates the error 12003, ie nothing changed when I set this flag.
Does anyone know how to handle this????
ASKER
I am quite sure that it should be false. Quotation from MSDN:
"The above behavior may be avoided by not using the INTERNET_FLAG_PASSIVE flag in the InternetConnect or InternetOpenUrl API. When this flag is not used WinInet uses active semantics for the FTP connection, which avoids the return of the status code, which causes the parsing problem."
"The above behavior may be avoided by not using the INTERNET_FLAG_PASSIVE flag in the InternetConnect or InternetOpenUrl API. When this flag is not used WinInet uses active semantics for the FTP connection, which avoids the return of the status code, which causes the parsing problem."
ASKER CERTIFIED SOLUTION
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Specifies passive or active mode for this FTP session. If set to TRUE, it sets the Win32 API dwFlag to INTERNET_FLAG_PASSIVE.
Maybe you need to set TRUE and not FALSE?