(MFC) Magyar Nemzeti Bank (MNB) Get Currencies

The Magyar Nemzeti Bank (MNB) is the central bank of Hungary. In this role, its primary objective is to achieve and maintain price stability. The MNB website is available to visitors in both Hungarian and English. The MNB provides the Arfolyam (trans. Exchange Rate) API, which can be used to retrieve current and historic currency exchange rates. This service uses SOAP calls issued in XML format.

This example gets a list of currencies.

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

See Also: Using MFC CString in Chilkat

#include <CkRest.h>
#include <CkXml.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

    CkRest rest;
    bool success;

    //  URL: http://www.mnb.hu/arfolyamok.asmx
    bool bTls = false;
    int port = 80;
    bool bAutoReconnect = true;
    success = rest.Connect("www.mnb.hu",port,bTls,bAutoReconnect);
    if (success != true) {
        strOut.append("ConnectFailReason: ");
        strOut.appendInt(rest.get_ConnectFailReason());
        strOut.append("\r\n");
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkXml xml;
    xml.put_Tag("soapenv:Envelope");
    xml.AddAttribute("xmlns:soapenv","http://schemas.xmlsoap.org/soap/envelope/");
    xml.AddAttribute("xmlns:web","http://www.mnb.hu/webservices/");
    xml.UpdateChildContent("soapenv:Header","");
    xml.UpdateChildContent("soapenv:Body|web:GetCurrencies","");

    rest.AddHeader("Content-Type","text/xml");
    rest.AddHeader("SOAPAction","/webservices/MNBArfolyamServiceSoap/GetCurrencies");
    rest.AddHeader("Accept","application/xml");

    CkStringBuilder sbRequestBody;
    xml.GetXmlSb(sbRequestBody);
    CkStringBuilder sbResponseBody;
    success = rest.FullRequestSb("POST","/arfolyamok.asmx",sbRequestBody,sbResponseBody);
    if (success != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int respStatusCode = rest.get_ResponseStatusCode();
    if (respStatusCode >= 400) {
        strOut.append("Response Status Code = ");
        strOut.appendInt(respStatusCode);
        strOut.append("\r\n");
        strOut.append("Response Header:");
        strOut.append("\r\n");
        strOut.append(rest.responseHeader());
        strOut.append("\r\n");
        strOut.append("Response Body:");
        strOut.append("\r\n");
        strOut.append(sbResponseBody.getAsString());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("response status code = ");
    strOut.appendInt(respStatusCode);
    strOut.append("\r\n");

    CkXml xmlResponse;
    xmlResponse.LoadSb(sbResponseBody,true);
    strOut.append(xmlResponse.getXml());
    strOut.append("\r\n");

    //  The XML response contains this:
    //  <?xml version="1.0" encoding="utf-8" ?>
    //  <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
    //      <s:Body>
    //          <GetCurrenciesResponse xmlns="http://www.mnb.hu/webservices/" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    //              <GetCurrenciesResult>&lt;MNBCurrencies&gt;&lt;Currencies&gt;&lt;Curr&gt;HUF&lt;/Curr&gt;&lt;Curr&gt;EUR&lt;/Curr&gt;&lt;Curr&gt;AUD&lt;/Curr&gt; ... &lt;/MNBCurrencies&gt;</GetCurrenciesResult>
    //          </GetCurrenciesResponse>
    //      </s:Body>
    //  </s:Envelope>

    //  Get the GetCurrenciesResult
    const char *resultEncoded = xmlResponse.getChildContent("s:Body|GetCurrenciesResponse|GetCurrenciesResult");
    strOut.append(resultEncoded);
    strOut.append("\r\n");

    //  Entity decode the result to get XML.
    CkStringBuilder sbResult;
    sbResult.Append(resultEncoded);
    sbResult.EntityDecode();

    //  Load it into XML.
    CkXml xmlResult;
    xmlResult.LoadSb(sbResult,true);
    strOut.append(xmlResult.getXml());
    strOut.append("\r\n");

    //  The result is this:

    //  <?xml version="1.0" encoding="utf-8" ?>
    //  <MNBCurrencies>
    //      <Currencies>
    //          <Curr>HUF</Curr>
    //          <Curr>EUR</Curr>
    //          <Curr>AUD</Curr>
    //          <Curr>BGN</Curr>
    //          <Curr>BRL</Curr>
    //          <Curr>CAD</Curr>
    //          <Curr>CHF</Curr>
    //          <Curr>CNY</Curr>
    //          <Curr>CZK</Curr>
    //          <Curr>DKK</Curr>
    //          <Curr>GBP</Curr>
    //          <Curr>HKD</Curr>
    //          <Curr>HRK</Curr>
    //          <Curr>IDR</Curr>
    //          <Curr>ILS</Curr>
    //          <Curr>INR</Curr>
    //          <Curr>ISK</Curr>
    //          <Curr>JPY</Curr>
    //          <Curr>KRW</Curr>
    //          <Curr>MXN</Curr>
    //          <Curr>MYR</Curr>
    //          <Curr>NOK</Curr>
    //          <Curr>NZD</Curr>
    //          <Curr>PHP</Curr>
    //          <Curr>PLN</Curr>
    //          <Curr>RON</Curr>
    //          <Curr>RSD</Curr>
    //          <Curr>RUB</Curr>
    //          <Curr>SEK</Curr>
    //          <Curr>SGD</Curr>
    //          <Curr>THB</Curr>
    //          <Curr>TRY</Curr>
    //          <Curr>UAH</Curr>
    //          <Curr>USD</Curr>
    //          <Curr>ZAR</Curr>
    //          <Curr>ATS</Curr>
    //          <Curr>AUP</Curr>
    //          <Curr>BEF</Curr>
    //          <Curr>BGL</Curr>
    //          <Curr>CYN</Curr>
    //          <Curr>CSD</Curr>
    //          <Curr>CSK</Curr>
    //          <Curr>DDM</Curr>
    //          <Curr>DEM</Curr>
    //          <Curr>EEK</Curr>
    //          <Curr>EGP</Curr>
    //          <Curr>ESP</Curr>
    //          <Curr>FIM</Curr>
    //          <Curr>FRF</Curr>
    //          <Curr>GHP</Curr>
    //          <Curr>GRD</Curr>
    //          <Curr>IEP</Curr>
    //          <Curr>ITL</Curr>
    //          <Curr>KPW</Curr>
    //          <Curr>KWD</Curr>
    //          <Curr>LBP</Curr>
    //          <Curr>LTL</Curr>
    //          <Curr>LUF</Curr>
    //          <Curr>LVL</Curr>
    //          <Curr>MNT</Curr>
    //          <Curr>NLG</Curr>
    //          <Curr>OAL</Curr>
    //          <Curr>OBL</Curr>
    //          <Curr>OFR</Curr>
    //          <Curr>ORB</Curr>
    //          <Curr>PKR</Curr>
    //          <Curr>PTE</Curr>
    //          <Curr>ROL</Curr>
    //          <Curr>SDP</Curr>
    //          <Curr>SIT</Curr>
    //          <Curr>SKK</Curr>
    //          <Curr>SUR</Curr>
    //          <Curr>VND</Curr>
    //          <Curr>XEU</Curr>
    //          <Curr>XTR</Curr>
    //          <Curr>YUD</Curr>
    //      </Currencies>
    //  </MNBCurrencies>
    // 


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }