Delphi ActiveX

Finnhub API - Get Stock Quote

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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
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;
end;