补丁更新服务器二(多线程下载+进度条)
- -为了做补丁服务器就差这个下载,所以就做了这个- -测试用
https://files.cnblogs.com/ajaxren/DowonFile2008_07_27.rar 原代码用2008写的
界面,同时下栽两个
(我的图画的好差啊)
newDownFile--下载类
newDownFile.ExecDown(ABDownFileChange inputDownFileChange)开始下载
/// <summary>
/// 更改通知进度条
/// </summary>
public class DownFileChangeProgressBar: ABDownFileChange
/// <summary>
/// 不需要更改通知
/// </summary>
public class DownFileNoChange: ABDownFileChange
--------------------下面的代码注意看注释啊
using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Net;using System.IO;using System.Threading;namespace DowonFile
{
/// <summary>
/// 新的下载类
/// </summary> public class newDownFile { /// <summary> /// 下载文件的信息 /// </summary> WebClient DownWebClientCurrent = new WebClient(); /// <summary> /// /// </summary> public newDownFile() { } /// <summary> /// 开始下载 /// </summary> public void ExecDown(ABDownFileChange inputDownFileChange) { Thread th = new Thread(new ParameterizedThreadStart(DownFileManagement)); //--设置为后台主线程 th.IsBackground = true; th.Start(inputDownFileChange); } /// 下载文件的管理者 /// </summary> private void DownFileManagement(object InputDownFIleInfo) { ABDownFileChange ThreadDownFIleInfo = InputDownFIleInfo as ABDownFileChange; string _DownUrl = ThreadDownFIleInfo.DownUrl; string _saveFile = ThreadDownFIleInfo.SaveFile; long fbytes; if (_saveFile != "") { //---确定文件的长度 fbytes = this.GetDownFileCount(ThreadDownFIleInfo.DownUrl); //-----读取不了 if (fbytes == -1) {//--当可以通知的时候 if (ThreadDownFIleInfo.isChange) ThreadDownFIleInfo.Error("错误"); return; } //-----------------------------下载对象，--------- 下载长度 byte[] mbyte = this.DownFile(ThreadDownFIleInfo, fbytes); this.SaveFile(mbyte, _saveFile); } } object l = new object(); /// <summary> /// 开始下载 /// </summary> /// <returns></returns> private byte[] DownFile( ABDownFileChange inputDownFileChange,long fbytes) { Stream strm = null; //--这里的锁是必须的否则－在多线程访问的时候会有 i/o错误 lock(l) { strm= DownWebClientCurrent.OpenRead(inputDownFileChange.DownUrl); } StreamReader reader = new StreamReader(strm, System.Text.Encoding.GetEncoding("gb2312")); byte[] mbyte = new byte[fbytes]; int allmybyte = (int)mbyte.Length; int startmbyte = 0; ////--准许通知首先设置长度 //if (inputDownFileChange.isChange) // inputDownFileChange.setCount(allmybyte, true); while (fbytes > 0) { int m = strm.Read(mbyte, startmbyte, allmybyte); if (m == 0) break; startmbyte += m; allmybyte -= m; //--准许通知，---开始发送更改通知 if (inputDownFileChange.isChange) inputDownFileChange.Change(m,(int)mbyte.Length); } strm.Close(); return mbyte; } /// <summary> /// 得到文件的长度 /// </summary> /// <returns></returns> public long GetDownFileCount(string _DownUrl) { WebRequest wr_request = WebRequest.Create(_DownUrl); WebResponse wr_response = wr_request.GetResponse(); long fbytes = wr_response.ContentLength; wr_response.Close(); return fbytes; } /// <summary> /// 保存文件 /// </summary> public void SaveFile(byte[] mbyte, string _saveFile) { FileStream fstrm = new FileStream(_saveFile, FileMode.OpenOrCreate, FileAccess.Write); fstrm.Write(mbyte, 0, mbyte.Length); fstrm.Close(); } }
}
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DowonFile{ /// <summary> /// 当发生更改的时候通知的类 /// </summary> public abstract class ABDownFileChange { public string DownUrl;// = _downUrl; public string SaveFile;// = _saveFile; /// <summary> /// 是否通知 /// </summary> public bool isChange = false; /// <summary> /// 不通知 /// </summary> public ABDownFileChange() { } /// <summary> /// 自有设定true是通知 /// </summary> /// <param name="inputIsChange"></param> public ABDownFileChange(bool inputIsChange) { isChange = inputIsChange; } /// <summary> ///设置更改 /// </summary> /// <param name="number"></param> public abstract void Change(int number, int count); /// <summary> /// 错误通知 /// </summary> /// <param name="message"></param> public abstract void Error(string message); }}
using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Net;using System.IO;using System.Threading;namespace DowonFile{ /// <summary> /// 更改 /// </summary> public class DownFileChangeProgressBar : ABDownFileChange { private System.Windows.Forms.ProgressBar _progressBar; /// <summary> /// 线程用到的委托 /// </summary> /// <param name="value"></param> delegate void StringParameterDelegate(int number,int count); public DownFileChangeProgressBar(System.Windows.Forms.ProgressBar InputProgressBar):base(true) { this._progressBar = InputProgressBar; } /// <summary> ///设置更改 /// </summary> /// <param name="number"></param> public override void Change(int number, int count) { //--判断是否在ui线程中工作哦 if (this._progressBar.InvokeRequired) { //--这里不可以用BeginInvoke，虽然 BeginInvoke速度快，但是多次调用会出现此线程坏死的错误，应该用Invoke // We're not in the UI thread, so we need to call BeginInvoke this._progressBar.Invoke(new StringParameterDelegate(this.Change), new object[] { number,count }); return; } // Must be on the UI thread if we've got this far，如果在直接设置 this._progressBar.Maximum = count; this._progressBar.Value += number; } /// <summary> /// 错误通知 /// </summary> /// <param name="message"></param> public override void Error(string message) { MessageBox.Show(message); } }}
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DowonFile{ /// <summary> /// 不需要更改通知 /// </summary> public class DownFileNoChange: ABDownFileChange { public DownFileNoChange() { } /// <summary> ///设置更改 /// </summary> /// <param name="number"></param> public override void Change(int number, int count) { } /// <summary> /// 错误通知 /// </summary> /// <param name="message"></param> public override void Error(string message) { } }}
----------------------------------调用using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace DowonFile{ public partial class test4 : Form { //--新的下载类 newDownFile n = new newDownFile(); public test4() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //--这个乡当与下载参数 DownFileChangeProgressBar dfcpb = new DownFileChangeProgressBar(this.progressBar1); saveFileDialog.ShowDialog(); dfcpb.DownUrl = this.textBox1.Text; dfcpb.SaveFile=this.saveFileDialog.FileName; n.ExecDown(dfcpb); } private void button2_Click(object sender, EventArgs e) { //newDownFile n = new newDownFile(); DownFileChangeProgressBar dfcpb = new DownFileChangeProgressBar(this.progressBar2); saveFileDialog.ShowDialog(); dfcpb.DownUrl = this.textBox2.Text; dfcpb.SaveFile = this.saveFileDialog.FileName; n.ExecDown(dfcpb); } }}
看到这里在说说扩展,比如断点续传,首先要记录断开的位置,其次,保存下载的数据,然后第二次下载的时候需要从段开的地方读数据,最后在合并就可以了
