Log In After ConnectOnly on an FTP Server

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Demonstrates the Chilkat Ftp2.LoginAfterConnectOnly method, which authenticates a control connection previously established by ConnectOnly. It takes no arguments, sends USER, PASS, and ACCT when required, then performs normal post-login initialization.

Background: This is the second half of the two-step connect. Beyond sending the credentials, it runs the same post-login setup Connect would — for example issuing TYPE I and any auto-negotiated features — so the session ends up in the same ready state either way. The value of the split is entirely in what you can do in the gap between the two calls.

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bool success = false;

//  Demonstrates the Ftp2.LoginAfterConnectOnly method, which authenticates a control connection
//  previously established by ConnectOnly.  It takes no arguments and sends USER, PASS, and (when
//  required) ACCT, then performs normal post-login initialization.

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

ftp.Hostname = "ftp.example.com";
ftp.Port = 21;

//  First connect without logging in.
success = ftp.ConnectOnly();
if (success == false) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

//  Set credentials (for example, after inspecting the greeting), then log in.
ftp.Username = "myFtpLogin";
ftp.Password = "myPassword";

success = ftp.LoginAfterConnectOnly();
if (success == false) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}

Debug.WriteLine("Logged in.");

success = ftp.Disconnect();
if (success == false) {
    Debug.WriteLine(ftp.LastErrorText);
    return;
}