Unityから画像付きツイート(update_with_media)をする。WWWクラスでは multipart/form-data が使えないのでTCPを直接叩く

UniTwi.cs

// 断片

		TcpClient tc = new TcpClient();
		tc.Connect("api.twitter.com", 80);

		using (NetworkStream ns = tc.GetStream())
		{
			System.IO.StreamWriter sw = new System.IO.StreamWriter(ns);
			System.IO.StreamReader sr = new System.IO.StreamReader(ns);


			string req = "POST /1.1/statuses/update_with_media.json HTTP/1.1\r\n";

			req += "Accept: */*\r\n";
			req += "User-Agent: Unity\r\n";
			req += "Content-Type: multipart/form-data, boundary=\""+BOUNDARY+"\"\r\n";

			req += "Authorization: "+auth;
			req += "\r\n";
			req += "Connection: close\r\n";
			req += "Host: api.twitter.com\r\n";
			req += "Content-Length: "+contents.Length.ToString() +"\r\n\r\n";
	

			req += contents;

			sw.Write(req);

			Debug.Log( req );

			sw.Flush();


			Debug.Log ( sr.ReadToEnd() );
		}
		tc.Close();

バウンダリは何でもいいっぽい

    string BOUNDARY = "_KARAAGE_KARAAGE_KARAAGE_KARAAGE";

データ部分。PNGはBASE64化したけどRAWでもいいはず。

    string contents ="--"+BOUNDARY+"\r\n";

    contents += "Content-Disposition: form-data; name=\"status\"\r\n";
    contents += "\r\n";
    contents += "Tweet from Unity!!\r\n";
    contents += "--"+BOUNDARY+"\r\n";
    contents += "Content-Disposition: form-data; name=\"media[]\"; filename=\"TEST.png\"\r\n";
    contents += "Content-Type: application/octet-stream\r\n";
    contents += "Content-Transfer-Encoding: base64\r\n";
    contents += "\r\n";
    contents += "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAAAXNSR0IArs4c\n";
    contents += "6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAwSURB\n";
    contents += "VDhPlcexDQAwCMAw/j+XB8ruJarkxfP2j08++eSTTz755JNPPvnkk08++bBz\n";
    contents += "NrbxENvBoHQAAAAASUVORK5CYII=\n";
    contents += "\r\n";
    contents += "--"+BOUNDARY+"--\r\n";

OAuthがメンドイ。そこさえ乗り切ればなんとかなる。