MessageBox.Show(myUdpClient.Send(sendBytes, sendBytes.Length))?

lss652019 2010-12-22 02:26:57

MessageBox.Show(myUdpClient.Send(sendBytes, sendBytes.Length))这个值是3是什么意思?还有其数字又是什么意思,如:1等等,那个数字是表示发送成功的?

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Missa 2010-12-23

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返回值=3:窗体事件为abort.即在弹出的messagebox上点击了abort按钮.
其他事件可以查阅windows.forms.dialogresault枚举下的值

it_gz_xi 2010-12-22

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The number of bytes sent
发送的字节数

robake 2010-12-22

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO.Ports; namespace UART1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); COMNUM.SelectedIndex = 2; BaudRate.SelectedIndex = 3; DataBit.SelectedIndex = 3; StopBit.SelectedIndex = 1; CheckBit.SelectedIndex = 0; CharDisp.Checked = true; SendChar.Checked = true; CloseComm.Enabled = false; DataSend.Enabled = false; } private void OpenComm_Click(object sender, EventArgs e) { serialPort1.Close(); serialPort1.PortName = COMNUM.Text; serialPort1.BaudRate = Convert.ToInt32(BaudRate.Text); serialPort1.DataBits = Convert.ToInt32(DataBit.Text); int SPnum = 4; SPnum = StopBit.SelectedIndex; switch (SPnum) { case 0: serialPort1.StopBits = StopBits.None; break; case 1: serialPort1.StopBits = StopBits.One; break; case 2: serialPort1.StopBits = StopBits.OnePointFive; break; case 3: serialPort1.StopBits = StopBits.Two; break; default: break; } SPnum = CheckBit.SelectedIndex; switch (SPnum) { case 0: serialPort1.Parity = Parity.None; break; case 1: serialPort1.Parity = Parity.Odd; break; case 2: serialPort1.Parity = Parity.Even; break; default: break; } /***************异常处理！****************/ try { serialPort1.Open(); } catch (Exception ex) { MessageBox.Show("错误："+ex.Message); } /*****************************************/ if (serialPort1.IsOpen) { CloseComm.Enabled = true; DataSend.Enabled = true; OpenComm.Enabled = false; COMNUM.Enabled = false; BaudRate.Enabled = false; DataBit.Enabled = false; StopBit.Enabled = false; CheckBit.Enabled = false; } } private void CloseComm_Click(object sender, EventArgs e) { try { serialPort1.Close(); CloseComm.Enabled = false; DataSend.Enabled = false; OpenComm.Enabled = true; COMNUM.Enabled = true; BaudRate.Enabled = true; DataBit.Enabled = true; StopBit.Enabled = true; CheckBit.Enabled = true; } catch (Exception ex) { MessageBox.Show("错误：" + ex.Message); CloseComm.Enabled = true; DataSend.Enabled = true; OpenComm.Enabled = false; COMNUM.Enabled = false; BaudRate.Enabled = false; DataBit.Enabled = false; StopBit.Enabled = false; CheckBit.Enabled = false; } } private void DataSend_Click(object sender, EventArgs e) { string InputString = SendBox.Text; /**********发送byte[]实例*********/ //byte[] SendBytes = new byte[]{0xff,0xe0,0xd0,0xc0,0xb0,0xa0,0x90,0x80,0x70,0x60}; //int DatasLength = SendBytes.Length; //serialPort1.Write(SendBytes, 0, DatasLength); /*******************************/ if (SendChar.Checked == true) //以字符形式发送，直接发送字符串 { try { char[] SendChars = InputString.ToCharArray(); int CharsLength = SendChars.Length; serialPort1.Encoding = System.Text.Encoding.GetEncoding("GB2312"); //解决中午乱码问题，国标2312编码格式 serialPort1.Write(SendChars, 0, CharsLength); } catch (Exception ex) { MessageBox.Show("错误：" + ex.Message); } } else { if (SendHEX.Checked == true) //以HEX形式发送，输入范围：0~255，即0~FF。 { try { byte SendByte = Convert.ToByte(InputString); try { serialPort1.Write(String.Format("{0:X}",SendByte)); } catch (Exception ex) { MessageBox.Show("错误：" + ex.Message); } } catch (Exception) { MessageBox.Show("请输入0~255，即0x00~0xFF！"); } } } } private void SerialPortDataReceive(object sender, SerialDataReceivedEventArgs e) { int ReceiveNums = serialPort1.BytesToRead; if (HEXDisp.Checked == true) { for (int i = 0; i < ReceiveNums; i++) { ReceiveBox.AppendText(String.Format("{0:X2} ", serialPort1.ReadByte())); } } else { if (CharDisp.Checked == true) { /* for (int i = 0; i < ReceiveNums; i++) { ReceiveBox.AppendText(String.Format("{0:X2}", Convert.ToChar(serialPort1.ReadByte()))); }*/ serialPort1.Encoding = System.Text.Encoding.GetEncoding("GB2312");//解决中午乱码问题，国标2312编码格式 ReceiveBox.AppendText(serialPort1.ReadExisting()); } } } private void ClearSend_Click(object sender, EventArgs e) { SendBox.Clear(); } private void ClearReceive_Click(object sender, EventArgs e) { ReceiveBox.Clear(); } private void Exit_Click(object sender, EventArgs e) { try { serialPort1.Close(); } catch (TimeoutException ex) { MessageBox.Show("错误：" + ex.Message); } Close(); } } }

转自：http://www.cnblogs.com/zhili/archive/2012/09/01/2659167.html 引用：前一个专题简单介绍了TCP编程的一些知识，UDP与TCP地位相当的另一个传输层协议，它也是当下流行的很多主流网络应用（例如QQ、MSN和Skype等一些即时通信软件传输层都是应用UDP协议的）底层的传输基础，所以在本专题中就简单介绍下UDP的工作原理和UDP编...

这样势必会加重服务器的负担，而P2P则改变了以服务器为中心的状态，使每个节点可以先从服务器上个下载一部分，然后再相互从对方或者其他节点下载其余部分。采用这种方式，当大量客户端同时下载时，就不会形成网络堵塞现象了。MessageBox.Show(“请先输入要寻找的种子资源名”, “提示”);MessageBox.Show(“请输入发布的资源名！协议的实现，这些类在System.Net.PeerToPeer命名空间里。这里就简单实现了资源发现的一个程序。微软帮我们已经封装好了对。在C/S架构中，所有。

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; using ...

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