(Objective-C) SFTP Synchronize Directory Tree - Download

Demonstrates how to download files to synchronize a local directory tree with a remote directory tree. The SyncTreeDownload method recursively descends the remote directory tree and downloads files based on existence, last-mod date/time and/or size differences.

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#import <CkoSFtp.h>
#import <NSString.h>

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

CkoSFtp *sftp = [[CkoSFtp alloc] init];

BOOL success = [sftp Connect: @"my-ssh-server.com" port: [NSNumber numberWithInt: 22]];
if (success == YES) {
    success = [sftp AuthenticatePw: @"mySshLogin" password: @"mySshPassword"];
}

if (success == YES) {
    success = [sftp InitializeSftp];
}

if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Synchronize the remote directory tree rooted at "syncDownloadTest/xml"
// with the local directory tree rooted at "qa_output"
// Both directories are relative paths.  The remote directory
// is relative to the HOME directory of the SSH user account.
// The local directory is relative to the current working directory of the process.
// It is also possible to use absolute paths.

NSString *remoteDir = @"syncDownloadTest/xml";
NSString *localDir = @"qa_output";

// Possible modes that can be passed to the SyncTreeDownload method are:
// 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.

// This example will use mode 6 to download missing, newer, or files with size differences.
int mode = 6;
// This example will turn on recursion to synchronize the entire tree. 
// Recursion can be turned off to synchronize the files of a single directory.
BOOL recursive = YES;
success = [sftp SyncTreeDownload: remoteDir localRoot: localDir mode: [NSNumber numberWithInt: mode] recurse: recursive];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Success.");