Delphi DLL Requires Chilkat v11.0.0+

HTTP POST JSON and Parse JSON Response

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

var
success: Boolean;
json: HCkJsonObject;
http: HCkHttp;
resp: HCkHttpResponse;
jsonResp: HCkJsonObject;
lifeAmount: PWideChar;
lifeResidualAmount: PWideChar;

begin
success := False;

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

json := CkJsonObject_Create();

success := CkJsonObject_LoadFile(json,'qa_data/json/jsonBodyForHttpPost.json');
if (success = False) then
  begin
    Memo1.Lines.Add(CkJsonObject__lastErrorText(json));
    Exit;
  end;

http := CkHttp_Create();

resp := CkHttpResponse_Create();
success := CkHttp_HttpJson(http,'POST','https://test.something.com/XYZ/API/v1/CreditInsuranceCalculator/CalculatePremiums',json,'application/json',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

jsonResp := CkJsonObject_Create();
CkJsonObject_Load(jsonResp,CkHttpResponse__bodyStr(resp));

CkJsonObject_putEmitCompact(jsonResp,False);
Memo1.Lines.Add(CkJsonObject__emit(jsonResp));

//  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.  
lifeAmount := CkJsonObject__stringOf(jsonResp,'LifeAmount');
lifeResidualAmount := CkJsonObject__stringOf(jsonResp,'LifeResidualAmount');

Memo1.Lines.Add('LifeAmount = ' + lifeAmount);
Memo1.Lines.Add('LifeResidualAmount = ' + lifeResidualAmount);

CkJsonObject_Dispose(json);
CkHttp_Dispose(http);
CkHttpResponse_Dispose(resp);
CkJsonObject_Dispose(jsonResp);