C#以二進制流方式讀寫文件

 

///1.判斷遠程文件是否存在 
 
///fileUrl:遠程文件路徑，包括IP地址以及詳細的路徑
 
private bool RemoteFileExists(string fileUrl)
         {
             bool result = false;//下載結果
 
            WebResponse response = null;
             try
             {
                 WebRequest req = WebRequest.Create(fileUrl);
 
                response = req.GetResponse();
 
                result = response == null ? false : true;
 
            }
             catch (Exception ex)
             {
                 result = false;
             }
             finally
             {
                 if (response != null)
                 {
                     response.Close();
                 }
             }
 
            return result;
         }
 
 
 
 
 
 
 
         

         /// 2.通過傳入的url獲取遠程文件數據(二進制流)，大家可以通過Response.BinaryWrite()方法將獲取的數據流輸出
 
        /// </summary>
         /// <param name="url">圖片的URL</param>
         /// <param name="ProxyServer">代理服務器</param>
         /// <returns>圖片內容</returns>
         public byte[] GetFile(string url, string proxyServer)
         {
             WebResponse rsp = null;
             byte[] retBytes = null;
 
            try
             {
                 Uri uri = new Uri(url);
                 WebRequest req = WebRequest.Create(uri);
 
                rsp = req.GetResponse();
                 Stream stream = rsp.GetResponseStream();
 
                if (!string.IsNullOrEmpty(proxyServer))
                 {
                     req.Proxy = new WebProxy(proxyServer);
                 }
 
                using (MemoryStream ms = new MemoryStream())
                 {
                     int b;
                     while ((b = stream.ReadByte()) != -1)
                     {
                         ms.WriteByte((byte)b);
                     }
                     retBytes = ms.ToArray();
                 }
             }
             catch (Exception ex)
             {
                 retBytes = null;
             }
             finally
             {
                 if (rsp != null)
                 {
                     rsp.Close();
                 }
 
 
 
 
 
          ///將本地文件通過httpwebrequest上傳到服務器
 
          ///localFile:本地文件路徑及文件名稱,uploadUrl:遠程路徑(虛擬目錄)
 
          ///在遠程路徑中需要把文件保存在的文件夾打開權限設置，否則上傳會失敗
 
         public bool UploadFileBinary(string localFile, string uploadUrl)
         {
             bool result = false;
             HttpWebRequest req = null;
             Stream reqStream = null;
             FileStream rdr = null;
 
            try
             {
 
                req = (HttpWebRequest)WebRequest.Create(uploadUrl);
 
                req.Method = "PUT";
                 req.AllowWriteStreamBuffering = true;
 
                // Retrieve request stream 
                reqStream = req.GetRequestStream();
 

                // Open the local file
                 rdr = new FileStream(localFile, FileMode.Open);
 
                byte[] inData = new byte[4096];
 
                int bytesRead = rdr.Read(inData, 0, inData.Length);
                 while (bytesRead > 0)
                 {
                     reqStream.Write(inData, 0, bytesRead);
                     bytesRead = rdr.Read(inData, 0, inData.Length);
                 }
 
                rdr.Close();
                 reqStream.Close();
 
                req.GetResponse();
 
                result = true;
             }
             catch (Exception e)
             {
                 result = false;
             }
             finally
             {
                 if (reqStream != null)
                 {
                     reqStream.Close();
                 }
                 if (rdr != null)
                 {
                     rdr.Close();
                 }
             }
             return result;
         }
 

            }
             return retBytes;
         }

本文轉載於：http://www.cnblogs.com/tsgx108/archive/2008/11/18/1335618.html感謝原作者的貢獻。轉載請著名出處