(Objective-C) SCP Upload Contents of String to Remote File

Demonstrates how to upload the contents of a string variable using the SCP protocol (Secure Copy Protocol over SSH). The text is uploaded to a file in specific remote directory. If the file did not already exist, it is created. If it already existed, it is overwritten.

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#import <CkoSsh.h>
#import <NSString.h>
#import <CkoScp.h>

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

CkoSsh *ssh = [[CkoSsh alloc] init];

// Connect to an SSH server:
NSString *hostname = 0;
int port;

// Hostname may be an IP address or hostname:
hostname = @"www.some-ssh-server.com";
port = 22;

BOOL success = [ssh Connect: hostname port: [NSNumber numberWithInt: port]];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Wait a max of 5 seconds when reading responses..
ssh.IdleTimeoutMs = [NSNumber numberWithInt:5000];

// Authenticate using login/password:
success = [ssh AuthenticatePw: @"myLogin" password: @"myPassword"];
if (success != YES) {
    NSLog(@"%@",ssh.LastErrorText);
    return;
}

// Once the SSH object is connected and authenticated, we use it
// as the underlying transport in our SCP object.
CkoScp *scp = [[CkoScp alloc] init];

success = [scp UseSsh: ssh];
if (success != YES) {
    NSLog(@"%@",scp.LastErrorText);
    return;
}

NSString *content = @"This string will be the contents of the remote file.";
NSString *remotePath = @"uploads/text/testUtf8.txt";

// The utf-8 byte representation of the string will be uploaded.
// See https://www.chilkatsoft.com/p/p_463.asp for a list of valid charsets.
NSString *charset = @"utf-8";

// This uploads to the "uploads/text" directory relative to the HOME
// directory of the SSH user account.  
// Note: The remote target directory must already exist on the SSH server.
success = [scp UploadString: remotePath textData: content charset: charset];
if (success != YES) {
    NSLog(@"%@",scp.LastErrorText);
    return;
}

remotePath = @"uploads/text/testUtf8_withBOM.txt";

// To include the utf-8 preamble (also known as the BOM),
// prefix the charset name with "bom:".  Any charset that can 
// optionally include a BOM can be specified in this way.
charset = @"bom:utf-8";

// Uploads to a remote file that contains text in the 
// utf-8 representation, including the BOM at the start of the file.
success = [scp UploadString: remotePath textData: content charset: charset];
if (success != YES) {
    NSLog(@"%@",scp.LastErrorText);
    return;
}

NSLog(@"%@",@"SCP upload string success.");

// Disconnect
[ssh Disconnect];