(Delphi ActiveX) Upload Media to Twitter

Demonstrates uploading image or video files to Twitter. After uploading, the media_id can be used to attach the uploaded media to a tweet.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
jsonToken: TChilkatJsonObject;
success: Integer;
http: TChilkatHttp;
req: TChilkatHttpRequest;
fac: TCkFileAccess;
jpgBytes: Array of Byte;
resp: IChilkatHttpResponse;
jsonResponse: TChilkatJsonObject;

begin
// It requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Assume we've previously obtained an access token and saved it to a JSON file..
jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/twitter.json');

http := TChilkatHttp.Create(Self);

// Provide the OAuth 1.0a credentials:
http.OAuth1 := 1;
http.OAuthConsumerKey := 'TWITTER_CONSUMER_KEY';
http.OAuthConsumerSecret := 'TWITTER_CONSUMER_SECRET';
http.OAuthToken := jsonToken.StringOf('oauth_token');
http.OAuthTokenSecret := jsonToken.StringOf('oauth_token_secret');

req := TChilkatHttpRequest.Create(Self);
req.HttpVerb := 'POST';
req.ContentType := 'multipart/form-data';
req.Path := '/1.1/media/upload.json';

req.AddHeader('Expect','100-continue');

// Add a JPEG image file to the upload.
fac := TCkFileAccess.Create(Self);

jpgBytes := fac.ReadEntireFile('qa_data/jpg/starfish.jpg');
req.AddBytesForUpload('media','starfish.jpg',jpgBytes);

resp := http.SynchronousRequest('upload.twitter.com',443,1,req.ControlInterface);
if (http.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

jsonResponse := TChilkatJsonObject.Create(Self);
jsonResponse.EmitCompact := 0;
jsonResponse.Load(resp.BodyStr);

if (resp.StatusCode <> 200) then
  begin
    Memo1.Lines.Add(jsonResponse.Emit());
    Exit;
  end;

// Show the successful response:
Memo1.Lines.Add(jsonResponse.Emit());
Memo1.Lines.Add('Success.');

// A successful JSON response looks like this:

// 	{
// 	  "media_id": 793137045996646400,
// 	  "media_id_string": "793137045996646400",
// 	  "size": 6229,
// 	  "expires_after_secs": 86400,
// 	  "image": {
// 	    "image_type": "image\/jpeg",
// 	    "w": 120,
// 	    "h": 120
// 	  }
// 	}
// 

// Get the information from the JSON:
Memo1.Lines.Add('media_id_string = ' + jsonResponse.StringOf('media_id_string'));
Memo1.Lines.Add('size = ' + IntToStr(jsonResponse.IntOf('size')));
Memo1.Lines.Add('image_type = ' + jsonResponse.StringOf('image.image_type'));
Memo1.Lines.Add('height/width = ' + IntToStr(jsonResponse.IntOf('image.w')) + ',' + IntToStr(jsonResponse.IntOf('image.h')));
end;