Objective-C

Limit FTP DownloadTree by Modification Date

Demonstrates the Chilkat Ftp2.SetOldestDateStr method, which sets the oldest remote modification time eligible for DownloadTree. The only argument is an RFC 822 date-time string; files older than it are skipped. It is a void method.

Background: This is a date filter for the recursive download: set a cutoff and DownloadTree pulls only files modified on or after it, ignoring everything older. It is ideal for fetching just recent activity — new logs, today's uploads — from a directory that also holds a large archive you do not want to re-download. The RFC 822 string carries a timezone so the cutoff is unambiguous.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoFtp2.h>

BOOL success = NO;

//  Demonstrates the Ftp2.SetOldestDateStr method, which sets the oldest remote modification time
//  eligible for DownloadTree.  The only argument is an RFC 822 date-time string.  It is a void
//  method.

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 == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

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

//  Only files modified on or after this date will be considered by DownloadTree.  Files older
//  than this are skipped.
[ftp SetOldestDateStr: @"Wed, 01 Jul 2026 00:00:00 -0000"];

//  Download only the recently-modified files in the remote tree.
success = [ftp DownloadTree: @"qa_output/recent"];
if (success == NO) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Downloaded recently modified files.");

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