C#传送文件接收端程序

//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
}
}