［C#］從ftp server下載檔案＠[C#] 資料結構與影像處理

2010-12-01 10:28:36| 人氣15,055| 回應2 | 上一篇 | 下一篇

［C#］從ftp server下載檔案

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從ftp伺服器下載檔案步驟如下:

1. 建立ftp物件, 連結FTP伺服器

建立FtpWebRequest的物件 request, 並與ftp伺服器的檔案連結.

using System.Net;

        FtpWebRequest request = FtpWebRequest.Create(FTPString) as FtpWebRequest;
        //  FTPString = FTPAddress + "/" + filename

2. 用userid和password登入ftp伺服器

request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = new NetworkCredential(username, password);

3. 將keepalive屬性設為True, 重複使用同一物件實體(instance)

        request.KeepAlive = true;        ///執行後不要關閉連結
      request.UsePassive = true;

   4. 使用binary方法傳送資料

request.UseBinary = true;

5. 將ftp檔案讀入buffer

FtpWebResponse response = request.GetResponse() as FtpWebResponse;
Stream reader = response.GetResponseStream();

MemoryStream memStream = new MemoryStream();

byte[] buffer = new byte[1024]; //每次讀取1024 bytes

         while (true)
         {
                Application.DoEvents();

int bytesRead = reader.Read(buffer, 0, buffer.Length);

                if (bytesRead == 0)
                {
                      //已經沒有資料, 結束下載
                       Application.DoEvents();
                       break;
                 }
                 else
                 {
                        //資料寫入buffer
                        memStream.Write(buffer, 0, bytesRead);

}
}

byte[] downloadedData = memStream.ToArray();

                reader.Close();
                memStream.Close();
                response.Close();

   6. 存檔

用filestream開啟本地磁碟機檔案, 並將檔案資料由 FileStream

      FileStream newFile = new FileStream(saveFile1.FileName, FileMode.Create);
                        newFile.Write(downloadedData, 0, downloadedData.Length);
                        newFile.Close();

FtpWebReguest物件的其他方法

       建立目錄
        FtpWebRequest Request = (FtpWebRequest)WebRequest.Create("ftp://IP address/Directory");
        Request.Credentials = new NetworkCredential("id", "pwd");
        Request.Method = WebRequestMethods.Ftp.MakeDirectory;
        FtpWebResponse Response = (FtpWebResponse)Request.GetResponse();
        Response.Close();

        修改檔案名稱
        FtpWebRequest Request = (FtpWebRequest)WebRequest.Create("ftp://IP address/FileName");
        Request.Credentials = new NetworkCredential("id", "pwd");
        Request.Method = WebRequestMethods.Ftp.Rename;
         Request.RenameTo = "NewFileName";
        FtpWebResponse Response = (FtpWebResponse)Request.GetResponse();
        Response.Close();

        移除檔案
        FtpWebRequest Request = (FtpWebRequest)WebRequest.Create ("ftp://IP address/FileName");
        Request.Credentials = new NetworkCredential("id", "pwd");
        Request.Method = WebRequestMethods.Ftp.DeleteFile;
        FtpWebResponse Response = (FtpWebResponse)Request.GetResponse();
        Response.Close();

參考資料來源：

C# FTP Upload

C# Download File FTP

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台長： Chris C.S Huang