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将图片二进制流上传到服务器
代码...
/// <summary> /// 调用webservice将图片的二进制流上传到服务器 /// </summary> /// <param name="url">上传图片的服务地址</param> /// <param name="file"></param> /// <param name="pic">文件的二进制流</param> /// <param name="paramName">名称...我这里填"file"就没错了,,,,</param> /// <param name="contentType">contentType的值(这里传的是图片类型为:image/jpeg)</param> /// <param name="nvc">键值对,Webservice服务哪里需要的其它数据,比如上传的用户ID及其他信息</param> /// <returns></returns> public static string HttpUploadFile(string url,string file,byte[] pic, string paramName, string contentType, NameValueCollection nvc) { string result = string.Empty; string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x"); byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url); req.ContentType = "multipart/form-data; boundary=" + boundary; req.Method = "POST"; req.KeepAlive = true; req.Credentials = System.Net.CredentialCache.DefaultCredentials; Stream writeStream = req.GetRequestStream(); foreach (string key in nvc.Keys) { writeStream.Write(boundarybytes, 0, boundarybytes.Length); //string formitem = string.Format(formdataTemplate, key, nvc[key]); string formdataTemplate = "Content-Disposition: form-data; name=\"" + key + "\"\r\n\r\n" + nvc[key]; byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formdataTemplate); writeStream.Write(formitembytes, 0, formitembytes.Length); } writeStream.Write(boundarybytes, 0, boundarybytes.Length); string headerTemplate = "Content-Disposition: form-data; name=\""+paramName+"\"; filename=\""+file+"\"\r\nContent-Type: "+contentType+"\r\n\r\n"; //string header = string.Format(headerTemplate, paramName, file, contentType); byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(headerTemplate); writeStream.Write(headerbytes, 0, headerbytes.Length); writeStream.Write(pic, 0, pic.Length); byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n"); writeStream.Write(trailer, 0, trailer.Length); writeStream.Close(); WebResponse response = null; try { response = req.GetResponse(); using (StreamReader streamReader = new StreamReader(response.GetResponseStream())) { result = streamReader.ReadToEnd(); } } catch (Exception ex) { result = ex.Message; } finally { if (response != null) { response.Close(); response = null; } if (writeStream != null) { writeStream.Close(); writeStream = null; } if(req!=null) req = null; } return result; }
调用代码...
byte[] pic = getImage(picUrl.Key,picUrl.Value, HttpTimeOut); string PicUploadUrl ="{webservice路径}"; NameValueCollection nvc = new NameValueCollection(); nvc.Add("example_upload_user_id", "007"); string ret = UploadPic.HttpUploadFile(PicUploadUrl, "picname.jpg",pic, "file", "image/jpeg", nvc);
附加代码...将指定路径的图片转换为二进制流
public static byte[] getImage(string imageUrl, string picType, int HttpTimeOut) { HttpWebRequest request = null; HttpWebResponse response = null; try { Uri uri = new Uri(imageUrl); byte[] buffer = new byte[1 * 1000 * 1024]; request = (HttpWebRequest)WebRequest.Create(uri); request.Timeout = HttpTimeOut; request.Method = "GET"; request.ContentType = "image/" + picType; request.KeepAlive = true; request.AllowAutoRedirect = true; response = (HttpWebResponse)request.GetResponse(); using (Stream stream = response.GetResponseStream()) { using (MemoryStream ms = new MemoryStream()) { buffer = new Byte[1024]; int current = 0; while ((current = stream.Read(buffer, 0, buffer.Length)) != 0) { ms.Write(buffer, 0, current); } return ms.ToArray(); } } /******************************下面这种方式下载图片不完全*********************************/ //using (Stream receiveStream = response.GetResponseStream()) // 网络stream, 不可获取长度 //{ // //BinaryReader reader = new BinaryReader(receiveStream); // bytesRead = receiveStream.Read(buffer, 0, buffer.Length); //} //bytesProcessed += bytesRead; //byte[] bytes = new byte[bytesProcessed]; //Buffer.BlockCopy(buffer, 0, bytes, 0, bytesProcessed); //return bytes; } catch { return new byte[0]; } finally { if (response != null) //如果服务器未响应，那么继续等待相应 { response.Close(); response = null; } if (request == null) { request = null; } } }
感谢我的搭档：lq筒靴...
将图片二进制流上传到服务器
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