Delphi ActiveX Requires Chilkat v11.4.0+

Finnhub API - Get Stock Quote

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Demonstrates how to get a stock quote from the Finnhub API. Delphi ActiveX

var
success: Integer;
apiKey: WideString;
symbol: WideString;
http: TChilkatHttp;
urlWithoutParams: WideString;
req: TChilkatHttpRequest;
resp: TChilkatHttpResponse;
json: TChilkatJsonObject;
statusCode: Integer;

begin
success := 0;

//  Replace with your actual Finnhub API key.
apiKey := 'YOUR_FINNHUB_API_KEY';
symbol := 'AAPL';

http := TChilkatHttp.Create(Self);

//  This is the URL without params.
urlWithoutParams := 'https://finnhub.io/api/v1/quote';

req := TChilkatHttpRequest.Create(Self);

//  Add params that will be sent in the URL.
req.AddParam('symbol',symbol);
req.AddParam('token',apiKey);

req.HttpVerb := 'GET';

//  Send the request to get the JSON response.
resp := TChilkatHttpResponse.Create(Self);
success := http.HttpReq(urlWithoutParams,req.ControlInterface,resp.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
resp.GetBodyJson(json.ControlInterface);

statusCode := resp.StatusCode;
Memo1.Lines.Add('response status code: ' + IntToStr(statusCode));

json.EmitCompact := 0;
Memo1.Lines.Add(json.Emit());

//  Sample result:

//  {
//    "c": 248.8,
//    "d": -4.09,
//    "dp": -1.6173,
//    "h": 255.493,
//    "l": 248.07,
//    "o": 253.9,
//    "pc": 252.89,
//    "t": 1774641600
//  }

if (statusCode = 200) then
  begin
    //  Add the symbol to the top of the result.
    json.AddStringAt(0,'symbol',symbol);

    //  Rename members for clarification.
    json.Rename('c','currentPrice');
    json.Rename('d','change');
    json.Rename('dp','percentChange');
    json.Rename('h','high');
    json.Rename('l','low');
    json.Rename('o','open');
    json.Rename('pc','prevClose');
    json.Rename('t','unixTime');

    Memo1.Lines.Add(json.Emit());

  end
else
  begin
    Memo1.Lines.Add('Failed');
  end;