(Objective-C) Send HTTP POST using non-UTF8 such as Windows-1250

Demonstrates how to specify the character encoding (charset) to be used for the body of an HTTP POST.

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#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoJsonObject.h>
#import <CkoHttpResponse.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

// Load a JSON file containing strings with Polish chars.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/json/has_polish_chars.json"];
if (success == NO) {
    NSLog(@"%@",json.LastErrorText);
    return;
}

// Add the request params expected by the server-side:
[req AddParam: @"tytul" value: [json StringOf: @"tytul"]];
[req AddParam: @"tresc" value: [json StringOf: @"tresc"]];

// Indicate we wish to explicitly send the charset attribute in the HTTP request header.
req.SendCharset = YES;

// Send the POST
// You can send the POST to the URL below.  It will respond with the request body in quoted-printable format.
// Using quoted-printable, we can easily see the binary bytes for the accented chars.
CkoHttpResponse *resp = 0;
resp = [http PostUrlEncoded: @"https://www.chilkatsoft.com/echoPost.cshtml" req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@",http.LastHeader);
NSLog(@"%@",resp.BodyStr);

// Sample output:

// --------------------------------------------------
// POST /echoPost.cshtml HTTP/1.1
// Host: www.chilkatsoft.com
// Content-Type: application/x-www-form-urlencoded; charset=utf-8
// Content-Length: 79
// 
// <pre>tytul=3DPrzyk%C5%82ad&amp;tresc=3DPrzyk%C5%82ad
// %82oszenie</pre>
// --------------------------------------------------

// We can see by the %C5%82 that utf-8 was sent, because %C5%82 is the 2-byte representation of a particular Polish char.

// -----------------------
// However.. we can change the charset used for the HTTP request by specifying the request object's charset.

req.SendCharset = YES;
req.Charset = @"windows-1250";

resp = [http PostUrlEncoded: @"https://www.chilkatsoft.com/echoPost.cshtml" req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@",http.LastHeader);
NSLog(@"%@",resp.BodyStr);

// Sample output...
// You can see how the bytes used for the Polish chars are now 1-byte per char (i.e. using Windows-1250) 

// --------------------------------------------------
// POST /echoPost.cshtml HTTP/1.1
// Host: www.chilkatsoft.com
// Content-Type: application/x-www-form-urlencoded; charset=windows-1250
// Content-Length: 70
// 
// <pre>tytul=3DPrzyk%B3ad&amp;tresc=3DPrzyk%B3ad
// e</pre>
// --------------------------------------------------