(Objective-C) FTP Non-Recursive Sync Directory (Download)

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Download files from the server that have filenames matchhing a pattern, and don't yet exist in a local directory.

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#import <CkoFtp2.h>
#import <CkoStringBuilder.h>
#import <CkoStringTable.h>
#import <NSString.h>

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

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

ftp.Hostname = @"ftp.example.com";
ftp.Username = @"myUsername";
ftp.Password = @"myPassword";
ftp.Port = [NSNumber numberWithInt:21];
ftp.AuthTls = YES;

// Connect and login to the FTP server.
BOOL success = [ftp Connect];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Change to the remote directory where the files are located.
// This step is only necessary if the files are not in the root directory
// of the FTP account.
success = [ftp ChangeRemoteDir: @"qa"];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// Indicate that we only want to download files with filenames ending in ".txt"
ftp.SyncMustMatch = @"*.txt";

// Modes for synchronization are as follows:
// mode=0: Download all files
// mode=1: Download all files that do not exist on the local filesystem.
// mode=2: Download newer or non-existant files.
// mode=3: Download only newer files. If a file does not already exist on the local filesystem, it is not downloaded from the server.
// mode=5: Download only missing files or files with size differences.
// mode=6: Same as mode 5, but also download newer files.
// mode=99: Do not download files, but instead delete remote files that do not exist locally.
int mode = 1;

// Download all files matching "*.txt" from the current remote ftp directory.
// The files are downloaded into c:/temp/qa_output
success = [ftp SyncLocalDir: @"c:/temp/qa_output" mode: [NSNumber numberWithInt: mode]];
if (success != YES) {
    NSLog(@"%@",ftp.LastErrorText);
    return;
}

// We can see what files were downloaded in the SyncedFiles property,
// which lists the files one per line.
NSLog(@"%@",ftp.SyncedFiles);

// Perhaps we wish to delete the files we just downloaded from the server..
CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
[sb Append: ftp.SyncedFiles];

CkoStringTable *st = [[CkoStringTable alloc] init];
[st AppendFromSb: sb];

int numFiles = [st.Count intValue];
int i = 0;
NSString *remoteFilename = 0;
while (i < numFiles) {
    remoteFilename = [st StringAt: [NSNumber numberWithInt: i]];
    NSLog(@"%@%@%@",@"Deleting ",remoteFilename,@" from the FTP server");
    success = [ftp DeleteRemoteFile: remoteFilename];
    if (success != YES) {
        NSLog(@"%@",ftp.LastErrorText);
        return;
    }

    i = i + 1;
}

success = [ftp Disconnect];