FTP Download a File with Progress Monitoring

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C++ sample program to download a file from an FTP server with progress monitoring callbacks.

// To get FTP progress monitoring callbacks, declare a C++ class
// that inherits from the CkFtpProgress base class and provide
// implementations for FtpPercentDone and AbortCheck.

class MyFtpProgress : public CkFtpProgress
    {
    // pctDone is a percent value between 1 and 100.
    // FtpPercentDone is called each time pctDone increases.
    // The abort argument can be set to cause the FTP to abort while in progress.
    void FtpPercentDone(long pctDone, bool *abort) 
	{ 
	printf("%d Percent Done!\n",pctDone);

	// In this example, the commented-out code will abort the transfer after it is 40% complete.
	//if (pctDone >= 40)
	    //{
	    //*abort = true;
	    //}
	}

    // Called periodically to check to see if the transfer should be aborted.
    void AbortCheck(bool *abort) 
	{ 
	printf("Abort Check!\n");

	// Set the *abort argument to true to force a transfer to abort.
	// For example:
	//*abort = true;
	}

    };


void FtpDownload(void)
    {
    CkFtp2 ftp;
    MyFtpProgress myProgress;

    ftp.UnlockComponent("anything for 30-day trial");

    ftp.put_Hostname("ftp.chilkatsoft.com");
    ftp.put_Username("***");
    ftp.put_Password("***");

    // non-passive (active) connections are most likely to work if firewalls are present.
    // However, if the data connection cannot be established, try switching to Passive mode instead.
    ftp.put_Passive(false);

    // The HeartbeatMs property controls the frequency of AbortCheck callbacks.
    // The default value is 0 (no callbacks).  Set it to a reasonable number of milliseconds:
    ftp.put_HeartbeatMs(250);

    // Some FTP server may require that the AutoGetSizeForProgress property be set to true.
    // Only do this if you see that percent-done progress events are not firing.  
    ftp.put_AutoGetSizeForProgress(true);

    bool success = ftp.Connect();
    if (!success)
	{
	ftp.SaveLastError("ftpLog.txt");
	return;
	}

    // Call GetFile2 to download with progress monitoring.
    // Call GetFile to download without progress monitoring.
    success = ftp.GetFile2("someFile.dat","someFile.dat",myProgress);
    if (!success)
	{
	ftp.SaveLastError("ftpLog.txt");
	}

    ftp.Disconnect();
    }