(MFC) HTTP POST JSON and Parse JSON Response

Demonstrates how to send a JSON POST and then parse the JSON response.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkJsonObject json;

    bool success = json.LoadFile("qa_data/json/jsonBodyForHttpPost.json");
    if (success != true) {
        strOut.append(json.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkHttp http;

    CkHttpResponse *resp = http.PostJson2("https://test.something.com/XYZ/API/v1/CreditInsuranceCalculator/CalculatePremiums","application/json",json.emit());
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkJsonObject jsonResp;
    jsonResp.Load(resp->bodyStr());

    jsonResp.put_EmitCompact(false);
    strOut.append(jsonResp.emit());
    strOut.append("\r\n");

    // The JSON response to be parsed looks like this:
    // {
    //   "LifeAmount": 513.85,
    //   "LifeResidualAmount": 123.38,
    //   "CriticalIllnessAmount": 0,
    //   "CriticalIllnessResidualAmount": 0,
    //   "DisabilityAmount": 881.70,
    //   "PolicyFee": 0.00,
    //   "PolicyFeeSecondary": 0,
    //   "PolicyFeeHidden": 50.00,
    //   "PolicyFeeHiddenSecondary": 0
    // }

    // We can get the floating point numbers as strings.  Then convert to double
    // using the appropriate string-to-double conversion for your programming language.
    // For example, in C++ use atof.  In C# use Convert.ToDouble.  
    const char *lifeAmount = jsonResp.stringOf("LifeAmount");
    const char *lifeResidualAmount = jsonResp.stringOf("LifeResidualAmount");

    strOut.append("LifeAmount = ");
    strOut.append(lifeAmount);
    strOut.append("\r\n");
    strOut.append("LifeResidualAmount = ");
    strOut.append(lifeResidualAmount);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }