Objective-C

Check FTP Connection and Login Status

Demonstrates the connection-status properties ConnectVerified, LoginVerified, ConnectFailReason, and Greeting.

Background: When Connect fails, these properties separate the possible causes: ConnectVerified shows whether the TCP connection was established at all, LoginVerified whether authentication then succeeded, and ConnectFailReason gives a numeric code pinpointing the failure — far more actionable than a generic error for distinguishing, say, an unreachable host from a bad password. The Greeting captures the server's opening banner, sometimes useful for identifying the server or its policies.

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Objective-C

#import <CkoFtp2.h>

BOOL success = NO;

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

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"myFtpLogin";

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
ftp.Password = @"myPassword";

success = [ftp Connect];
if (success != YES) {
    //  ConnectFailReason gives a numeric code describing why Connect failed.
    NSLog(@"%@%d",@"Connect failed, reason code: ",[ftp.ConnectFailReason intValue]);
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

//  After a successful connect, these flags report what succeeded.
NSLog(@"%@%d",@"TCP connection verified: ",ftp.ConnectVerified);
NSLog(@"%@%d",@"Login verified: ",ftp.LoginVerified);

//  The Greeting property holds the server's initial greeting banner.
NSLog(@"%@%@",@"Server greeting: ",ftp.Greeting);

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