不带确认机制的UDP文件传输

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下面介绍一种最普通，方便的UDP文件传输方法。

将下面三步加入到你的程序通信部分就可以实现文件传输了！

第一步：选择传输文件

private void btnFileSend_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlgOpenFile = new OpenFileDialog();
            dlgOpenFile.ShowReadOnly = true;
            if (dlgOpenFile.ShowDialog() == DialogResult.OK)
            {
                try
                {
                        string path = dlgOpenFile.FileName;
     fs = new FileStream(path, FileMode.Open, FileAccess.ReadWrite);
                        SendMessage(ip, "FileName," + fs.Name );               
                }
                catch
                {
                    MessageBox.Show("文件打开失败");
                }
            }
        }

private void ReceiveMessage()
        {
            
            IPEndPoint remote = null;//远端任意主机，从任意端口发送信息
            while (true)
            {
                try
                {
                    byte[] bytes = receiveUdpClient.Receive(ref remote);
                    string receive = Encoding.Unicode.GetString(bytes, 0, bytes.Length);
                    string[] splitString = receive.Split(',');
                    
                    switch (splitString[0])
                    {
                        case"FileName":
                            if (MessageBox.Show("是否接收文件？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                            {
                                FileStream fs1 = null;
                                string[] file = splitString[1].Trim().Split('\\');
                                filePath = "C:\\" + file[file.Length-1];
                                fs1 = new FileStream(filePath, FileMode.Create);
                                fs1.Close();
                                SendMessage(ip, "FileAgree");
                            }
                            else
                            {
                                SendMessage(ip, "FileDeny");
                            }
                            break;
                        case "FileAgree":
                            MessageBox.Show("开始发送文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Question);
                            FileRead(fs);
                            break;
                        case "FileDeny":
                            MessageBox.Show("拒绝接收文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Question);
                            fs.Close();
                            break;
                        case "ACK": FileRead(fs); break;
                        case "File": 
                            FileStream fs2 = null;
                            fs2 = File.OpenWrite(filePath);
                            fs2.Position = fs2.Length; //将待写入内容追加到文件末尾
                            byte[] bytes2 = Encoding.Unicode.GetBytes(splitString[2]);
                            fs2.Write(bytes2, 0, bytes2.Length);
                            fs2.Close();
                            SendMessage(ip, "ACK");
                            break;
                        case "End":MessageBox.Show("接收成功");
                            break;
                    }
                }
                catch
                {
                    break;
                }
            }
        }

int fileSize = 1024; int count = 0;
        private void FileRead(FileStream temp)
        {
            byte[] bytes;
            if (fileSize >= temp.Length - count * fileSize)
            {
                bytes = new byte[temp.Length - count * fileSize];
                int num = fs.Read(bytes, 0, bytes.Length);
                if (num != 0)
                    SendMessage(ip, "File," + fs.Name + "," + Encoding.Unicode.GetString(bytes));
                else
                {
                    SendMessage(ip, "End,");
                    fs.Close(); count = 0;
                }
               
            }
            else
            {
                bytes = new byte[fileSize];//存储读取结果
                int num = fs.Read(bytes, 0, bytes.Length);
                if (num != 0)
                {
                    SendMessage(ip, "File," + fs.Name + "," + Encoding.Unicode.GetString(bytes));
                    count++;
                }
            }
        } 

不带确认机制的UDP文件传输

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原文地址：http://blog.csdn.net/zlele0326/article/details/51334173