Lazarus Pascal

Example: Http.SetUrlVar method

Demonstrates the HTTP SetUrlVar method. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder,
  Chilkat.Http;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  url: string;
  sbJson: TStringBuilder;
  statusCode: Integer;

begin
  success := False;

  http := THttp.Create;

  url := 'https://finnhub.io/api/v1/quote?symbol={$symbol}&token={$api_key}';

  //  When the request is sent, the {$symbol} is replaced with "MSFT"
  //  and the {$api_key} is replaced with "1234567890ABCDEF"
  http.SetUrlVar('symbol','MSFT');
  http.SetUrlVar('api_key','1234567890ABCDEF');

  sbJson := TStringBuilder.Create;
  success := http.QuickGetSb(url,sbJson);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := http.LastStatus;
  if (statusCode <> 200) then
    begin
      WriteLn('Status code: ' + statusCode);
      WriteLn('Error Message:');
      WriteLn(sbJson.GetAsString());
    end
  else
    begin
      WriteLn('JSON Stock Quote:');
      WriteLn(sbJson.GetAsString());
    end;

  //  Output:

  //  JSON Stock Quote:
  //  {"c":522.98,"d":0.5,"dp":0.0957,"h":524.51,"l":520.86,"o":524.28,"pc":522.48,"t":1755271948}


  http.Free;
  sbJson.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.