FTP Resume

[Shweta]

Hi,

We are trying to buid an application in c++ which will have FTP
download and FTP resume download facility.FTP download is working
fine but there is a problem with resume download.

For FTP resume download the approach is,

1.Using FTPCommand() winAPI and issuing 'REST offset' command.then
using
'RETR filename' command to retrive the file from the given
offset.However the second command is failing.

The code snipet is

sRequest.Format(_T("REST %d"), 0);
//Send the resume request
HINTERNET *phFtpCommand = NULL;
BOOL bSuccess = FtpCommand(hFTPSession, FALSE, FTP_TRANSFER_TYPE_ASCII
, sRequest, 0, phFtpCommand);
//the above call succeeds

sRequest.Format("RETR TestFTP/Test.txt");
bSuccess = FtpCommand(hFTPSession, 1, FTP_TRANSFER_TYPE_ASCII ,
sRequest, 0, phFtpCommand);

The above function is failing.GetLastError() says that the parameter
is incorrect.

any pointers on how FTP resume is to be implemented are welcomed.

 

[Peter Johansson]

Hi,

We are trying to buid an application in c++ which will have FTP
download and FTP resume download facility.FTP download is working
fine but there is a problem with resume download.

For FTP resume download the approach is,

1.Using FTPCommand() winAPI and issuing 'REST offset' command.then
using
'RETR filename' command to retrive the file from the given
offset.However the second command is failing.

The code snipet is

sRequest.Format(_T("REST %d"), 0);
//Send the resume request
HINTERNET *phFtpCommand = NULL;
BOOL bSuccess = FtpCommand(hFTPSession, FALSE, FTP_TRANSFER_TYPE_ASCII
, sRequest, 0, phFtpCommand);
//the above call succeeds

sRequest.Format("RETR TestFTP/Test.txt");
bSuccess = FtpCommand(hFTPSession, 1, FTP_TRANSFER_TYPE_ASCII ,
sRequest, 0, phFtpCommand);

The above function is failing.GetLastError() says that the parameter
is incorrect.

any pointers on how FTP resume is to be implemented are welcomed.

Sure, just read RFC959 http://www.ietf.org/rfc/rfc0959.txt

/ Peter

 

[Jack Klein]

Hi,

We are trying to buid an application in c++ which will have FTP
download and FTP resume download facility.FTP download is working
fine but there is a problem with resume download.

[snip]

What is your question about the C++ language which has no built-in
support for networking?