Pascal (Lazarus/Delphi)

X.com Create Post

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Causes the User to create a Post under the authorized account. Pascal (Lazarus/Delphi)

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.Http,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  json: TJsonObject;
  jsonToken: TJsonObject;
  resp: THttpResponse;
  sbResponseBody: TStringBuilder;
  jResp: TJsonObject;
  respStatusCode: Integer;
  Id: string;
  Text: string;

begin
  success := False;

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

  http := THttp.Create;

  //  Implements the following CURL command:

  //  curl -X POST "https://api.x.com/2/tweets" \
  //  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
  //  -H "Content-Type: application/json" \
  //  -d '{"text":"Hello, X.com! This is my first post using the API."}'

  //  Use the following online tool to generate HTTP code from a CURL command
  //  Convert a cURL Command to HTTP Source Code

  //  Use this online tool to generate code from sample JSON:
  //  Generate Code to Create JSON

  //  The following JSON is sent in the request body.

  //  {
  //    "text": "Hello, X.com! This is my first post using the API."
  //  }

  json := TJsonObject.Create;
  json.UpdateString('text','Hello, X.com! This is my first post using the API.');

  //  Adds the "Authorization: Bearer YOUR_ACCESS_TOKEN" header.
  //  Get our access token.
  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/x.json');
  if (success <> True) then
    begin
      WriteLn('Failed to load x.json');
      Exit;
    end;

  //  Adds the "Authorization: Bearer <token>" header.
  http.AuthToken := jsonToken.StringOf('access_token');

  resp := THttpResponse.Create;
  success := http.HttpJson('POST','https://api.x.com/2/tweets',json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  sbResponseBody := TStringBuilder.Create;
  resp.GetBodySb(sbResponseBody);

  jResp := TJsonObject.Create;
  jResp.LoadSb(sbResponseBody);
  jResp.EmitCompact := False;

  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode >= 400) then
    begin
      WriteLn('Response Header:');
      WriteLn(resp.Header);
      WriteLn('Failed.');
      Exit;
    end;

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  {
  //    "data": {
  //      "id": "1346889436626259968",
  //      "text": "Hello, X.com! This is my first post using the API."
  //    }
  //  }

  //  Sample code for parsing the JSON response...
  //  Use the following online tool to generate parsing code from sample JSON:
  //  Generate Parsing Code from JSON

  Id := jResp.StringOf('data.id');
  Text := jResp.StringOf('data.text');


  http.Free;
  json.Free;
  jsonToken.Free;
  resp.Free;
  sbResponseBody.Free;
  jResp.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.