(MFC) URL Encoding Charset in POST Query Params

Demonstrates how to control the URL encoding charset in POST query params.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkStringBuilder.h>
#include <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // We have the string "MÆRSK".
    const char *nameWin1252Encoded = "M%E6RSK";

    // Note: The DecodeAndAppend method is newly added in Chilkat v9.5.0.87
    CkStringBuilder sb;
    bool success = sb.DecodeAndAppend(nameWin1252Encoded,"url","windows-1252");

    CkHttp http;

    // We're setting the session log filename so we can see the exact request sent.
    http.put_SessionLogFilename("qa_output/sessionLog.txt");

    // First demonstrate a simple application/x-www-form-urlencoded POST

    CkHttpRequest req;

    // Set the Charset = "utf-8" to cause URL encoding to use utf-8.
    req.put_Charset("utf-8");

    req.AddParam("name",sb.getAsString());

    CkHttpResponse *resp = http.PostUrlEncoded("https://www.chilkatsoft.com/something",req);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // This is the request that is sent:
    // Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

    // 	POST /something HTTP/1.1
    // 	Host: www.chilkatsoft.com
    // 	Content-Type: application/x-www-form-urlencoded
    // 	Content-Length: 15
    // 
    // 	name=M%C3%A6RSK

    delete resp;

    // ---------------------------------------------------------------
    // Switch to windows-1252

    req.put_Charset("windows-1252");

    resp = http.PostUrlEncoded("https://www.chilkatsoft.com/something",req);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // This is the request that is sent:
    // Notice that windows-1252 is used in the query param (the letter 'Æ' is %E6)

    // 	POST /something HTTP/1.1
    // 	Host: www.chilkatsoft.com
    // 	Content-Type: application/x-www-form-urlencoded
    // 	Content-Length: 12
    // 
    // 	name=M%E6RSK

    delete resp;

    // ---------------------------------------------------------------
    // Let's do the same with SynchronousRequest, switching back to utf-8

    req.put_Path("/something");
    req.put_HttpVerb("POST");
    req.put_ContentType("application/x-www-form-urlencoded");

    req.put_Charset("utf-8");

    resp = http.SynchronousRequest("www.chilkatsoft.com",443,true,req);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // This is the request that is sent:
    // Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

    // 	POST /something HTTP/1.1
    // 	Host: www.chilkatsoft.com
    // 	Content-Type: application/x-www-form-urlencoded
    // 	Content-Length: 15
    // 
    // 	name=M%C3%A6RSK

    delete resp;

    // ---------------------------------------------------------------
    // Let's do a PostXml where the query params are in the HTTP request start line, 
    // and the Content-Type is text/xml where the body of the request is XML.

    req.put_Path("/something");
    req.put_HttpVerb("POST");
    req.put_ContentType("text/xml");
    success = req.LoadBodyFromString("<test>123</test>","utf-8");
    req.put_Charset("utf-8");

    // Remember... our request object still contains the query param added in the above call to AddParam.

    resp = http.SynchronousRequest("www.chilkatsoft.com",443,true,req);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // This is the request that is sent:
    // Notice that utf-8 is used in the query param (the letter 'Æ' is %C3%A6)

    // 	POST /something?name=M%C3%A6RSK HTTP/1.1
    // 	Host: www.chilkatsoft.com
    // 	Content-Type: text/xml
    // 	Content-Length: 16
    // 
    // 	<test>123</test>

    delete resp;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }