C#文件传送使用较为频繁的场景,是即时聊天工具中的文件传输。比如点对点方面的传送。在一般情况下,C#文件传送都要对通信端口,连接的控制,异常的控制等做好准备。
这个C#文件传送程序是借鉴TcpFileTransferDemo项目的来的。C#文件传送源码很少,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
- {
- ///
- /// SaveFileForm 的摘要说明。
- ///
- 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;
- ///
- /// 必需的设计器变量。
- ///
- 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
- //
- }
- ///
- /// 清理所有正在使用的资源。
- ///
- 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
- ///
- /// 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。
- ///
- 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
- }
- }
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