腾讯的API（add_pic_t）微博中发送文字和图片，下面的方法可以成功发送文字，但是图片无法显示，望高手点教斧正，万分感谢。

川哥编程 2014-03-13 02:33:41

腾讯的API（add_pic_t）微博中发送文字和图片，下面的方法可以成功发送文字，但是图片无法显示，望高手点教斧正，万分感谢。
pic参数描述：要上传的图片的文件名以及图片的内容（在发送请求时，图片内容以二进制数据流的形式发送，见下面的请求示例）。图片仅支持gif、jpeg、jpg、png、bmp及ico格式（所有图片都会重新压缩，gif被重新压缩后不会再有动画效果），图片size小于4M。

add_pic_t: http://wiki.connect.qq.com/add_pic_t

public string AddPicToTencentWeibo(string access_token, string oauth_consumer_key, string openid, string content, string url) {
WebRequest req = WebRequest.Create(url);
HttpWebRequest rq = req as HttpWebRequest;
if (rq == null) {
return null;
}
rq.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
//httpRequest.ContentType = "application/x-www-form-urlencoded";
rq.Method = "POST";

string boundary = Guid.NewGuid().ToString();
string header = string.Format("--{0}", boundary);
string footer = string.Format("--{0}--", boundary);

var sb = new StringBuilder();
rq.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
sb.AppendLine(header);
sb.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0}\"", "access_token"));
sb.AppendLine("Content-Type: text/plain; charset=utf-8");
//contents.AppendLine("Content-Transfer-Encoding: 8bit");
sb.AppendLine();
sb.AppendLine(access_token);

sb.AppendLine(header);
sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", "oauth_consumer_key"));
sb.AppendLine("Content-Type: text/plain; charset=utf-8");
//contents.AppendLine("Content-Transfer-Encoding: 8bit");
sb.AppendLine();
sb.AppendLine(oauth_consumer_key);

sb.AppendLine(header);
sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", "openid"));
sb.AppendLine("Content-Type: text/plain; charset=utf-8");
//contents.AppendLine("Content-Transfer-Encoding: 8bit");
sb.AppendLine();
sb.AppendLine(openid);

sb.AppendLine(header);
sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", "content"));
sb.AppendLine("Content-Type: text/plain; charset=utf-8");
//contents.AppendLine("Content-Transfer-Encoding: 8bit");
sb.AppendLine();
sb.AppendLine(content);

sb.AppendLine(header);
string fileHeader = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"", "pic", "qq_female.jpg");
string fileData = Encoding.Default.GetString(File.ReadAllBytes(Server.MapPath("/ig/lovely/qq_female.jpg")));

sb.AppendLine(fileHeader);
sb.AppendLine("Content-Type:image/jpeg");
sb.AppendLine("Content-Transfer-Encoding: binary");
sb.AppendLine();
sb.AppendLine(fileData);
sb.AppendLine(footer);

byte[] data = Encoding.UTF8.GetBytes(sb.ToString());
rq.ContentLength = data.Length;

Stream stream = rq.GetRequestStream();
stream.Write(data, 0, data.Length);
stream.Close();

Stream stm;
try {
stm = rq.GetResponse().GetResponseStream();
} catch (Exception e) {
return e.ToString();
}

string result = string.Empty;
using (StreamReader reader = new StreamReader(stm, Encoding.UTF8)) {
try {
result = reader.ReadToEnd();
} finally {
reader.Close();
reader.Dispose();
}
}
stm.Close();
stm.Dispose();
return result;
}

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