Question

我无法实现Twitter的[update profile image]方法。有没有人有任何示例代码可以将图像作为原始multiart数据传递给Twitter API？

我正在使用.NET。

Answer 1

您是否查看了以下适用于.NET的Twitter API Libararies？

Answer 2

用于在C＃中连接Twitter的好库是tweet#。这比直接这样做简单得多。

Answer 3

取自LINQ2Twitter project并稍作修改以简化..

    public static String UpdateAvatar(String filePath)
    {
        String avatarUrl= "http://twitter.com/account/update_profile_image.xml";
        String file = Path.GetFileName(filePath);

        string imageType;

        switch (Path.GetExtension(file).ToLower())
        {
            case ".jpg":
            case ".jpeg":
                imageType = "jpg";
                break;
            case ".gif":
                imageType = "gif";
                break;
            case ".png":
                imageType = "png";
                break;
            default:
                throw new ArgumentException(
                    "Can't recognize the extension of the file you're uploading. Please choose either a *.gif, *.jpg, *.jpeg, or *.png file.", filePath);
        }

        string contentBoundaryBase = DateTime.Now.Ticks.ToString("x");
        string beginContentBoundary = string.Format("--{0}\r\n", contentBoundaryBase);
        var contentDisposition = string.Format("Content-Disposition:form-data); name=\"image\"); filename=\"{0}\"\r\nContent-Type: image/{1}\r\n\r\n", file, imageType);
        var endContentBoundary = string.Format("\r\n--{0}--\r\n", contentBoundaryBase);

        var formDataSB = new StringBuilder();

        byte[] fileBytes = null;
        string fileByteString = null;
        Encoding encoding = Encoding.GetEncoding("iso-8859-1");

        using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
        {
            byte[] buffer = new byte[4096];
            var memStr = new MemoryStream();
            memStr.Position = 0;
            int bytesRead = 0;

            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
            {
                memStr.Write(buffer, 0, bytesRead);
            }

            memStr.Position = 0;
            fileByteString = encoding.GetString(memStr.GetBuffer());
        }

        fileBytes =
            encoding.GetBytes(
                formDataSB.ToString() +
                beginContentBoundary +
                contentDisposition +
                fileByteString +
                endContentBoundary);

        var req = (HttpWebRequest)WebRequest.Create(AvatarUpdateURL);
        req.ServicePoint.Expect100Continue = false;
        req.ContentType = "multipart/form-data;boundary=" + contentBoundaryBase;
        req.PreAuthenticate = true;
        req.AllowWriteStreamBuffering = true;
        req.Method = "POST";
        req.ContentLength = fileBytes.Length;
        req.Credentials = new NetworkCredential(Username, Password);

        string responseXml = null;

        using (var reqStream = req.GetRequestStream())
        {
            reqStream.Write(fileBytes, 0, fileBytes.Length);
            reqStream.Flush();
        }

        string httpStatus = string.Empty;
        WebResponse resp = null;

        try
        {
            resp = req.GetResponse();

            httpStatus = resp.Headers["Status"];

            using (var respStream = resp.GetResponseStream())
            using (var respRdr = new StreamReader(respStream))
            {
                responseXml = respRdr.ReadToEnd();
            }
        }
        catch (WebException wex)
        {
            //do something
        }
        finally
        {
            if (resp != null)
            {
                resp.Close();
            }
        }
        return responseXml.ToString();

    }

C＃中的Twitter update_profile_image

3 个答案: