(Objective-C) SFTP Resume Download

Demonstrates how to resume an SFTP download from a previous partial download.

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

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

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

// Set some timeouts, in milliseconds:
sftp.ConnectTimeoutMs = [NSNumber numberWithInt:5000];
sftp.IdleTimeoutMs = [NSNumber numberWithInt:10000];

// Connect to the SSH server.  
// The standard SSH port = 22
// The hostname may be a hostname or IP address.
NSString *hostname = @"sftp.example.com";
int port = 22;
BOOL success = [sftp Connect: hostname port: [NSNumber numberWithInt: port]];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Authenticate with the SSH server.  Chilkat SFTP supports
// both password-based authenication as well as public-key
// authentication.  This example uses password authenication.
success = [sftp AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// After authenticating, the SFTP subsystem must be initialized:
success = [sftp InitializeSftp];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

// Download the file:
NSString *remoteFilePath = 0;
NSString *localFilePath = 0;
localFilePath = @"c:/temp/hamlet.xml";
remoteFilePath = @"subdir1/subdir2/hamlet.xml";
// The ResumeDownloadFileByName method will check
// the local file and begin downloading the remote file
// at the appropriate point.  For example, if the local
// file is already 215624 bytes long, it will begin downloading
// the remote file at the 215625'th byte -- appending to
// the local file.
success = [sftp ResumeDownloadFileByName: remoteFilePath localFilePath: localFilePath];
if (success != YES) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

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