(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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#include <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkJsonObject.h>
#include <CkHttpResponse.h>

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

    CkHttp http;

    CkHttpRequest req;

    // Load a JSON file containing strings with Polish chars.
    CkJsonObject json;
    bool success = json.LoadFile("qa_data/json/has_polish_chars.json");
    if (success == false) {
        std::cout << json.lastErrorText() << "\r\n";
        return;
    }

    // Add the request params expected by the server-side:
    req.AddParam("tytul",json.stringOf("tytul"));
    req.AddParam("tresc",json.stringOf("tresc"));

    // Indicate we wish to explicitly send the charset attribute in the HTTP request header.
    req.put_SendCharset(true);

    // 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.
    CkHttpResponse *resp = 0;
    resp = http.PostUrlEncoded("https://www.chilkatsoft.com/echoPost.cshtml",req);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << http.lastHeader() << "\r\n";
    std::cout << resp->bodyStr() << "\r\n";

    // 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.

    delete resp;

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

    req.put_SendCharset(true);
    req.put_Charset("windows-1250");

    resp = http.PostUrlEncoded("https://www.chilkatsoft.com/echoPost.cshtml",req);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << http.lastHeader() << "\r\n";
    std::cout << resp->bodyStr() << "\r\n";

    // 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>
    // --------------------------------------------------

    delete resp;
    }