C++

Restart/Resume FTP Download

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Resume downloading a file from an FTP server. C++

#include <CkFtp2.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkFtp2 ftp;

    ftp.put_Hostname("ftp.example.com");
    ftp.put_Username("login");
    ftp.put_Password("password");

    //  Connect and login to the FTP server.
    success = ftp.Connect();
    if (success != true) {
        std::cout << ftp.lastErrorText() << "\r\n";
        return;
    }

    //  Change to the remote directory where the file is located.
    //  This step is only necessary if the file is not in the root directory
    //  for the FTP account.
    success = ftp.ChangeRemoteDir("temp");
    if (success != true) {
        std::cout << ftp.lastErrorText() << "\r\n";
        return;
    }

    //  To resume a download, it is assumed that the partial file
    //  is already present on the local filesystem.
    //  You only need to set the RestartNext property to resume
    //  the download.  The Chilkat FTP component sets the resume
    //  point by getting the existing size of the target (local) file.
    ftp.put_RestartNext(true);

    const char *localFilename = "big.zip";
    const char *remoteFilename = "big.zip";

    //  Resume downloading...
    success = ftp.GetFile(remoteFilename,localFilename);
    if (success != true) {
        std::cout << ftp.lastErrorText() << "\r\n";
        return;
    }

    success = ftp.Disconnect();

    std::cout << "File Downloaded!" << "\r\n";
    }