(Unicode C++) Restart/Resume FTP Download

Resume downloading a file from an FTP server.

Chilkat C/C++ Library Downloads
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#include <CkFtp2W.h>

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

    CkFtp2W ftp;

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

    // Connect and login to the FTP server.
    bool success = ftp.Connect();
    if (success != true) {
        wprintf(L"%s\n",ftp.lastErrorText());
        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(L"temp");
    if (success != true) {
        wprintf(L"%s\n",ftp.lastErrorText());
        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 wchar_t *localFilename = L"big.zip";
    const wchar_t *remoteFilename = L"big.zip";

    // Resume downloading...
    success = ftp.GetFile(remoteFilename,localFilename);
    if (success != true) {
        wprintf(L"%s\n",ftp.lastErrorText());
        return;
    }

    success = ftp.Disconnect();

    wprintf(L"File Downloaded!\n");
    }