wp7之《够酷悦音播放器》 使用线程池实现多线程下载 （二）断点续传下载

  前面写到 多线程下载，没有写断点续传下载。为了完整性，补写了这篇 ；下面用代码说话

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/// <summary>

        /// 下载方法(带进度条)

        /// </summary>

        /// <param name="URL">服务器URL地址</param>

        /// <param name="Filename">存放到本地的路径</param>

        /// <param name="Prog">进度条</param>

        public static void DownFile(string URL, string Filename, ProgressBar Prog)

        {

 

            try

            {

                HttpWebRequest Myrq = (HttpWebRequest)HttpWebRequest.Create(URL);

 

 

                HttpWebResponse myrp = (HttpWebResponse)Myrq.GetResponse();

                long totalBytes = myrp.ContentLength;

                Prog.Maximum = (int)totalBytes;

                Stream st = myrp.GetResponseStream();

                Stream so = new FileStream(Filename, FileMode.Create);

                long totalDownloadedByte = 0;

                byte[] by = new byte[1024];

                int osize = st.Read(by, 0, (int)by.Length);

                while (osize > 0)

                {

                    totalDownloadedByte = osize + totalDownloadedByte;

                    Application.DoEvents();

                    so.Write(by, 0, osize);

                    Prog.Value = (int)totalDownloadedByte;

                    osize = st.Read(by, 0, (int)by.Length);

                }

                so.Close();

                st.Close();

                MessageBox.Show("下载完毕!", "下载提示：", MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);

            }

 

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk,

                    MessageBoxDefaultButton.Button1);

            }

 

 

 

 

 

 

 

方法二：

 

            ////打开上次下载的文件或新建文件

            //long lStartPos = 0;

            //FileStream fs;

            //if (File.Exists(Filename))

            //{

            //    fs = File.OpenWrite(Filename);

            //    lStartPos = fs.Length;

            //    fs.Seek(lStartPos, System.IO.SeekOrigin.Current); //移动文件流中的当前指针

            //}

            //else

            //{

            //    fs = new FileStream(Filename, FileMode.Create);

            //    lStartPos = 0;

            //}

            //try

            //{

            //    HttpWebRequest Myrq = (HttpWebRequest)HttpWebRequest.Create(URL);

 

            //    if (lStartPos > 0)

            //        Myrq.AddRange((int)lStartPos); //设置Range值

 

            //    HttpWebResponse myrp = (HttpWebResponse)Myrq.GetResponse();

            //    long totalBytes = myrp.ContentLength;

            //    Prog.Maximum = (int)totalBytes;

            //    Stream st = myrp.GetResponseStream();

            //    Stream so = new FileStream(Filename, FileMode.Create);

            //    long totalDownloadedByte = 0;

            //    byte[] by = new byte[1024];

            //    int osize = st.Read(by, 0, (int)by.Length);

            //    while (osize > 0)

            //    {

            //        totalDownloadedByte = osize + totalDownloadedByte;

            //        Application.DoEvents();

            //        so.Write(by, 0, osize);

            //        Prog.Value = (int)totalDownloadedByte;

            //        osize = st.Read(by, 0, (int)by.Length);

            //    }

            //    so.Close();

            //    st.Close();

            //    MessageBox.Show("下载完毕!", "下载提示：", MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);

            //}

 

            //catch (Exception ex)

            //{

            //    MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk,

            //        MessageBoxDefaultButton.Button1);

            //}

 

        }