Streaming SFTP Download

Demonstrates how to download a file chunk by chunk from an SSH server.

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// Needs #include <CkSFtp.h>
// Needs #include <CkByteData.h>

    CkString strOut;

    //  Important: It is helpful to send the contents of the
    //  sftp.LastErrorText property when requesting support.

    CkSFtp sftp;

    //  Any string automatically begins a fully-functional 30-day trial.
    bool success;
    success = sftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Set some timeouts, in milliseconds:
    sftp.put_ConnectTimeoutMs(5000);
    sftp.put_IdleTimeoutMs(15000);

    //  Connect to the SSH server.
    //  The standard SSH port = 22
    //  The hostname may be a hostname or IP address.
    long port;
    const char * hostname;
    hostname = "www.my-ssh-server.com";
    port = 22;
    success = sftp.Connect(hostname,port);
    if (success != true) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Authenticate with the SSH server.  Chilkat SFTP supports
    //  both password-based authenication as well as public-key
    //  authentication.  This example uses password authenication.
    success = sftp.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  After authenticating, the SFTP subsystem must be initialized:
    success = sftp.InitializeSftp();
    if (success != true) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Open a file on the server:
    const char * handle;
    handle = sftp.openFile("hamlet.xml","readOnly","openExisting");
    if (handle == 0 ) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    unsigned char *pData = 0;
    CkByteData dataChunk;

    bool bEof;
    bEof = false;

    long chunkSize;
    chunkSize = 10000;
    long numBytesReceived;
    while (!bEof) {

        success = sftp.ReadFileBytes(handle,chunkSize,dataChunk);
        if (success == true) {

            //  Do whatever  you wish with the data received...
            //  It is possible that if the EOF is reached, 0 bytes will be returned.
            numBytesReceived = dataChunk.getSize();
            pData = dataChunk.getData();

            strOut.append("numBytesReceived = ");
            strOut.appendInt(numBytesReceived);
            strOut.append("\r\n");

        }
        else {
            strOut.append(sftp.lastErrorText());
            strOut.append("\r\n");
            break;
        }

        bEof = sftp.Eof(handle);
    }

    //  Close the file.
    success = sftp.CloseHandle(handle);
    if (success != true) {
        strOut.append(sftp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Success.\r\n");

    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());