(Objective-C) Send UTF-16 on TCP or TLS Socket

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Demonstrates how to send a string on a connected TCP or SSL/TLS socket such that it is the utf-16 byte representation that is sent.

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#import <CkoSocket.h>
#import <NSString.h>
#import <CkoStringBuilder.h>

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

CkoSocket *socket = [[CkoSocket alloc] init];

BOOL tls = NO;
int maxWaitMs = 20000;
NSString *domainOrIpAddr = @"example.com";
int port = 1234;

// Connect to the whatever is expecting our connection...
BOOL success = [socket Connect: domainOrIpAddr port: [NSNumber numberWithInt: port] ssl: tls maxWaitMs: [NSNumber numberWithInt: maxWaitMs]];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// Let's say we have an XML file saved in the utf-16 byte representation,
// and we want to send it over the connection using the utf-16 byte representation...

// First the file into a Chilkat StringBuilder.
// Tell the LoadFile method that we are reading utf-16 bytes..
CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init];
success = [sbXml LoadFile: @"qa_data/xml/myUtf16.xml" charset: @"utf-16"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load utf-16 XML file..");
    return;
}

// Tell the socket object that we wish to send the utf-16 byte representation of the string.
socket.StringCharset = @"utf-16";

// Send the string as utf-16 bytes.
success = [socket SendSb: sbXml];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// Let's say we wanted to instead send the string as utf-8 bytes.
// Just tell the socket object...
socket.StringCharset = @"utf-8";

// Send the string as utf-8 bytes.
success = [socket SendSb: sbXml];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// If our XML file was utf-8, then just tell the StringBuilder that we're reading utf-8.
// Once the text is properly contained in the StringBuilder, we can send the contents in any other charset (windows-1252, utf-16, utf-8, etc.) 
// as long as it make sense (i.e. we obviously can't send Japanese text using a single-byte charset such as Windows-1252).
success = [sbXml LoadFile: @"qa_data/xml/myUtf8.xml" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load utf-8 XML file..");
    return;
}

// Send as utf-16
socket.StringCharset = @"utf-16";

// Send the string as utf-16 bytes.
success = [socket SendSb: sbXml];
if (success != YES) {
    NSLog(@"%@",socket.LastErrorText);
    return;
}

// ...
// ...