(C# UWP/WinRT) Restart/Resume FTP Upload

Demonstrates how to restart / resume an FTP upload.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

ftp.Hostname = "ftp.example.com";
ftp.Username = "login";
ftp.Password = "password";

// Connect and login to the FTP server.
bool success = await ftp.ConnectAsync();
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// Change to the remote directory where the file will be uploaded.
success = await ftp.ChangeRemoteDirAsync("temp");
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

// In this example, assume that a previous FTP upload failed,
// and the incomplete file (bigFile.zip) exists on the FTP server.
// You only need to set the RestartNext property to resume
// the upload.  When RestartNext is set, the next call
// to PutFile (or PutFileFromBinaryData, PutFileFromTextData)
// will automatically resume the upload from the point of failure.
// (The way it works is that the FTP component sends a "SIZE"
// command to the FTP server to find out how many bytes of
// the file already exist on the server.  It then begins
// uploading from that point.

// Note: After PutFile is called, the RestartNext property
// is automatically set to false.
ftp.RestartNext = true;

// Upload a file with restart.
string localFilename = "bigFile.zip";
string remoteFilename = "bigFile.zip";

success = await ftp.PutFileAsync(localFilename,remoteFilename);
if (success != true) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

success = await ftp.DisconnectAsync();

Debug.WriteLine("File Uploaded!");