C#传送文件接收端程序

OStack程序员社区-中国程序员成长平台 › 门户 › 编程› Node.js›Node.js教程

原作者: [db:作者] 来自: [db:来源] 收藏邀请

//程序是借鉴TcpFileTransferDemo项目的来的.谢谢原作者.在BAIDU.GOOGLE里面好难找到这个代码的下载.希望大家能跟原作者多多学习交流.成为好朋友.好的代码总是很难寻找到合适的.C#传文件源码很少.好辛苦.好感谢原作者.还有改进的地方就是可以用多线程进行大文件传送.

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

using System.Data;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace CSharpData
{
/// <summary>
/// SaveFileForm 的摘要说明。
/// </summary>
public class SaveFileForm : System.Windows.Forms.Form
{
  private System.Windows.Forms.Panel panel1;
  private System.Windows.Forms.TextBox textBox2;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.TextBox textBox1;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Button button4;
  private System.Windows.Forms.Button button3;
  private System.Windows.Forms.Button button2;
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.StatusBar statusBar1;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public SaveFileForm()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   setStatusDelegate = new SetStatusDelegate(SetStatus);
   getSaveFileDelegate = new GetSaveFileDelegate(GetSaveFile);
   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if(components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.panel1 = new System.Windows.Forms.Panel();
   this.textBox2 = new System.Windows.Forms.TextBox();
   this.label2 = new System.Windows.Forms.Label();
   this.textBox1 = new System.Windows.Forms.TextBox();
   this.label1 = new System.Windows.Forms.Label();
   this.button4 = new System.Windows.Forms.Button();
   this.button3 = new System.Windows.Forms.Button();
   this.button2 = new System.Windows.Forms.Button();
   this.button1 = new System.Windows.Forms.Button();
   this.statusBar1 = new System.Windows.Forms.StatusBar();
   this.panel1.SuspendLayout();
   this.SuspendLayout();
   //
   // panel1
   //
   this.panel1.Controls.Add(this.textBox2);
   this.panel1.Controls.Add(this.label2);
   this.panel1.Controls.Add(this.textBox1);
   this.panel1.Controls.Add(this.label1);
   this.panel1.Controls.Add(this.button4);
   this.panel1.Controls.Add(this.button3);
   this.panel1.Controls.Add(this.button2);
   this.panel1.Controls.Add(this.button1);
   this.panel1.Location = new System.Drawing.Point(8, 16);
   this.panel1.Name = "panel1";
   this.panel1.Size = new System.Drawing.Size(272, 152);
   this.panel1.TabIndex = 0;
   //
   // textBox2
   //
   this.textBox2.Location = new System.Drawing.Point(96, 64);
   this.textBox2.Name = "textBox2";
   this.textBox2.TabIndex = 15;
   this.textBox2.Text = "800";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(8, 72);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(80, 16);
   this.label2.TabIndex = 14;
   this.label2.Text = "通信端口";
   //
   // textBox1
   //
   this.textBox1.Location = new System.Drawing.Point(96, 24);
   this.textBox1.Name = "textBox1";
   this.textBox1.TabIndex = 13;
   this.textBox1.Text = "192.168.1.250";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(8, 32);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(80, 16);
   this.label1.TabIndex = 12;
   this.label1.Text = "IP地址";
   //
   // button4
   //
   this.button4.Location = new System.Drawing.Point(160, 104);
   this.button4.Name = "button4";
   this.button4.Size = new System.Drawing.Size(64, 23);
   this.button4.TabIndex = 11;
   this.button4.Text = "接收文件";
   this.button4.Click += new System.EventHandler(this.button4_Click);
   //
   // button3
   //
   this.button3.Location = new System.Drawing.Point(56, 104);
   this.button3.Name = "button3";
   this.button3.Size = new System.Drawing.Size(64, 23);
   this.button3.TabIndex = 10;
   this.button3.Text = "发送文件";
   this.button3.Click += new System.EventHandler(this.button3_Click);
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(200, 64);
   this.button2.Name = "button2";
   this.button2.Size = new System.Drawing.Size(64, 23);
   this.button2.TabIndex = 9;
   this.button2.Text = "停止监听";
   this.button2.Click += new System.EventHandler(this.button2_Click);
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(200, 24);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(64, 23);
   this.button1.TabIndex = 8;
   this.button1.Text = "开始监听";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // statusBar1
   //
   this.statusBar1.Location = new System.Drawing.Point(0, 191);
   this.statusBar1.Name = "statusBar1";
   this.statusBar1.Size = new System.Drawing.Size(292, 22);
   this.statusBar1.TabIndex = 1;
   this.statusBar1.Text = "statusBar1";
   //
   // SaveFileForm
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(292, 213);
   this.Controls.Add(this.statusBar1);
   this.Controls.Add(this.panel1);
   this.Name = "SaveFileForm";
   this.Text = "局域网内接收文件";
   this.panel1.ResumeLayout(false);
   this.ResumeLayout(false);

}
#endregion

  private void button1_Click(object sender, System.EventArgs e)
  {
   port = 0;
   try
   {
    port = int.Parse(textBox2.Text);
    if (port < 1 || port > 65535) throw new ArgumentOutOfRangeException();
   }
   catch
   {
    MessageBox.Show("请输入有效的端口号。");
    textBox2.Focus();
    textBox2.SelectAll();
    return;
   }
   button1.Enabled = false;
   button2.Enabled = true;
   worker = new Thread(new ThreadStart(Start));
   worker.IsBackground = true;
   worker.Start();
  }

  private void button2_Click(object sender, System.EventArgs e)
  {
   try { worker.Abort(); }
   catch {}
  }

  private void button3_Click(object sender, System.EventArgs e)
  {

  }

  private void button4_Click(object sender, System.EventArgs e)
  {

  }

  #region 程序逻辑
  private Thread worker;
  private int port;

  private void Start()
  {
   try // 捕获线程中止异常
   {
    SetStatus("开始侦听端口");
    TcpListener tcpListener = new TcpListener(IPAddress.Any, port);
    try // 捕获开始侦听时出现的错误，例如端口已被占用
    {
     tcpListener.Start();
    }
    catch (Exception e)
    {
     SetStatus("侦听端口出错：" + e.Message);
     InvokeCancel();
     return;
    }
    try // 确保停止侦听
    {
     SetStatus("等待传入连接中");
     while (true) // 一直循环，直到线程被中止。但每次只处理一个连接
     {
      // 没有等待传入的连接就一直等待。不使用异步模型以提高程序可读性
      while (!tcpListener.Pending())
       Thread.Sleep(100);

      TcpClient tcpClient = tcpListener.AcceptTcpClient();
      tcpClient.NoDelay = true;
      tcpClient.ReceiveTimeout = 30000;
      BinaryReader reader = new BinaryReader(tcpClient.GetStream());

      try // 捕获文件传输中途出现的错误，并确保关闭连接
      {
       string filename = reader.ReadString();
       long total = reader.ReadInt64();
       SetStatus("收到文件传输请求，文件名 " + filename +
        "，大小 " + total.ToString() + " 字节");

       string saveAs = GetSaveFile(filename);
       if (saveAs == null)
       {
        SetStatus("操作已取消。等待下一连接中");
        // finally 段会帮忙关闭连接
       }
       else
       {
        SetStatus("接收文件中");
        FileStream fs = File.Create(saveAs);
        try
        {
         byte[] buffer = new byte[8192];
         int len;
         while (total > 0)
         {
          len = reader.Read(buffer, 0, 8192);
          if (len == 0)
           throw new IOException("发送方中止了连接");
          fs.Write(buffer, 0, len);
          SetStatus("接收文件中 - 剩余 " +
           (total -= len).ToString() + " 字节");
         }
         SetStatus("文件已保存至 " + saveAs +
          "。等待下一连接中");
        }
        finally
        {
         fs.Close();
        }
       }
      }
      catch (Exception e)
      {
       SetStatus("文件传输中途出错：" + e.Message);
       InvokeCancel();
      }
      finally
      {
       try { reader.Close(); }
       catch {}
       try { tcpClient.Close(); }
       catch {}
      }
     }
    }
    finally
    {
     tcpListener.Stop();
    }
   }
   catch (ThreadAbortException)
   {
    SetStatus("用户中断");
    InvokeCancel();
   }
   finally
   {
    worker = null;
   }
  }
  #endregion

  #region 线程安全UI操作代码
  private delegate void SetStatusDelegate(string status);
  private SetStatusDelegate setStatusDelegate; // 赋值在构造函数里

  private void SetStatus(string status)
  {
   if (InvokeRequired)
    Invoke(setStatusDelegate, new object[] { status });
   else
    statusBar1.Text = status;
  }

  private void InvokeCancel()
  {
   if (InvokeRequired)
    Invoke(new MethodInvoker(InvokeCancel));
   else
   {
    button2.Enabled = false;
    button1.Enabled = true;
   }
  }

  private delegate string GetSaveFileDelegate(string filename);
  private GetSaveFileDelegate getSaveFileDelegate; //

  private string GetSaveFile(string filename)
  {
   if (InvokeRequired)
    return (string)Invoke(getSaveFileDelegate, new object[] { filename });
   else
   {
    //打开要发送的文件
    SaveFileDialog sfd = new SaveFileDialog();
    sfd.FileName = filename;
    if (sfd.ShowDialog(this) == DialogResult.OK)
     return sfd.FileName;
    else
     return null;
   }
  }
  #endregion
}
}