(Objective-C) SCP Download/Upload Binary Files as Encoded Strings

Demonstrates how to upload and download binary files as encoded strings (base64, hex, etc.) using the SCP protocol (Secure Copy Protocol over SSH).

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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];

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

// Connect to an SSH server:
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
// in our SCP object.
CkoScp *scp = [[CkoScp alloc] init];

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

NSString *remotePath = @"images/starfish.jpg";

// Download the binary file and return as a base64 string.
// See <a href="http://www.cknotes.com/chilkat-binary-encoding-list/">List of Encodings</a> for a list of possible encodings.
NSString *encodedJpg = [scp DownloadBinaryEncoded: remotePath encoding: @"base64"];
if (scp.LastMethodSuccess != YES) {
    NSLog(@"%@",scp.LastErrorText);
    return;
}

remotePath = @"images/starfish2.jpg";

// Now upload from the base64 string to the SSH server.
// Insided the call to UploadBinaryEncoded, the base64 string is decoded,
// and the decoded bytes are uploaded.  The resulting starfish2.jpg on the
// server will be identical to the original starfish.jpg
success = [scp UploadBinaryEncoded: remotePath encodedData: encodedJpg encoding: @"base64"];
if (success != YES) {
    NSLog(@"%@",scp.LastErrorText);
    return;
}

NSLog(@"%@",@"SCP download/upload binary encoded success.");

// Disconnect
[ssh Disconnect];