Objective-C

Log In After ConnectOnly on an FTP Server

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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Objective-C

#import <CkoFtp2.h>

BOOL success = NO;

//  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.

CkoFtp2 *ftp = [[CkoFtp2 alloc] init];

ftp.Hostname = @"ftp.example.com";
ftp.Port = [NSNumber numberWithInt:21];

//  First connect without logging in.
success = [ftp ConnectOnly];
if (success == NO) {
    NSLog(@"%@",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 == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Logged in.");

success = [ftp Disconnect];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}