https://cloud.tencent.com/developer/article/1464507
自行调整页面
连接上以后主动发个数据
namespace TCPClient
{
public partial class Form1 : Form
{
private TcpClient myTcpClient = null;// TcpClient
Thread ConnectThread;//连接线程
string ipAddress;//记录ip地址
int Port = 0;//端口号
private NetworkStream networkstrem = null;//获取网络数据用
private Thread ReceiveThread;//接收消息线程
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
getIPAddress();//刚才写的那个函数.获取电脑IP,并显示在下拉框
}
/// <获取本机 IP 地址>
///
/// </summary>
/// <returns></returns>
private void getIPAddress()
{
IPAddress[] hostipspool = Dns.GetHostAddresses("");//获取本机所以IP
comboBox1.Items.Clear();//清除下拉框里面的内容
foreach (IPAddress ipa in hostipspool)
{
if (ipa.AddressFamily == AddressFamily.InterNetwork)
{
comboBox1.Items.Add(ipa.ToString());//下拉框加入IP数据
comboBox1.SelectedIndex = comboBox1.Items.Count > 0 ? 0 : -1;//显示第一个
}
}
}
private void ConnectMethod()
{
myTcpClient = new TcpClient(); //实例化myTcpClient
try
{
myTcpClient.Connect(ipAddress, Port);//连接服务器
networkstrem = myTcpClient.GetStream();//获取数据流操作实例.(给的方法就是这个......)
try
{
networkstrem.Write(new byte[] { 0x31, 0x32, 0x33 }, 0,3);//发送数据,"123"
}
catch
{
}
//连接上以后往下执行
Invoke((new Action(() =>
{
button1.Text = "断开";
})));
}
catch (Exception)
{
//异常处理函数
Invoke((new Action(() =>
{
button1.Text = "连接";
})));
try { myTcpClient.Close(); }catch { } //关闭连接
}
}
//连接和断开按钮
private void button1_Click(object sender, EventArgs e)
{
if (button1.Text == "连接")
{
ipAddress = comboBox1.Text.ToString();//获取IP地址
Port = Convert.ToInt32(textBox1.Text.ToString());//获取端口号
ConnectThread = new Thread(ConnectMethod);//创建任务
ConnectThread.Start();//启动任务
}
else
{
try { myTcpClient.Close(); } catch { } //关闭连接
Invoke((new Action(() =>
{
button1.Text = "连接";
})));
}
}
private void comboBox1_DropDown(object sender, EventArgs e)
{
getIPAddress();//刚才写的那个函数
}
}
}
测试
现在写接收数据,然后显示
/// <接收消息线程>
///
/// </summary>
private void ReceiveDataMethod()
{
int RecvCnt = 0;
byte[] recvBytes = new byte[1024];
while (true)
{
try
{
RecvCnt = networkstrem.Read(recvBytes, 0, recvBytes.Length);//获取数据
Invoke((new Action(() =>
{
//new ASCIIEncoding().GetString(recvBytes, 0, RecvCnt)//byte转化为字符串
textBox2.AppendText(new ASCIIEncoding().GetString(recvBytes, 0, RecvCnt));//追加显示
})));
}
catch (Exception ex)
{
//异常处理函数
Invoke((new Action(() =>
{
button1.Text = "连接";
})));
try { ReceiveThread.Abort(); }//销毁任务
catch { }
try { networkstrem.Dispose(); }//释放资源
catch { }
try { myTcpClient.Close(); }//关闭TCP
catch { }
}
}
}
测试
关闭窗体的时候,关闭下TCP
再优化一下,,检测服务器主动断开
//检测服务器是主动断开
if ((myTcpClient.Client.Poll(20, SelectMode.SelectRead)) && (myTcpClient.Client.Available == 0))
{
myTcpClient.Close();//关闭以后,后面程序会引发异常
}
测试
现在写发送,自行双击那个按钮,,,让软件添加上那个按钮的点击事件
byte[] sendbyte = Encoding.Default.GetBytes(textBox3.Text.ToString());//获取发送的数据,转为byte
if (sendbyte.Length > 0)
{
try { networkstrem.Write(sendbyte, 0, sendbyte.Length); }//发送数据
catch (Exception) { MessageBox.Show("请检查连接", "提示!"); }
}
else
{
MessageBox.Show("数据不能为空", "提示!");
}
测试
然后做个 Hex发送
/// <字符串转16进制格式,不够自动前面补零>
/// "0054FF" ==> 16进制 0x00 0x54 0xFF
/// </summary>
/// <param name="hexString"></param>
/// <returns></returns>
private static byte[] strToToHexByte(String hexString)
{
int i;
bool Flag = false;
hexString = hexString.Replace(" ", "");//清除空格
if ((hexString.Length % 2) != 0)
{
Flag = true;
}
if (Flag == true)
{
byte[] returnBytes = new byte[(hexString.Length + 1) / 2];
try
{
for (i = 0; i < (hexString.Length - 1) / 2; i++)
{
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
}
returnBytes[returnBytes.Length - 1] = Convert.ToByte(hexString.Substring(hexString.Length - 1, 1).PadLeft(2, '0'), 16);
}
catch
{
for (i = 0; i < returnBytes.Length; i++)
{
returnBytes[i] = 0;
}
MessageBox.Show("超过16进制范围A-F,已初始化为0", "提示");
}
return returnBytes;
}
else
{
byte[] returnBytes = new byte[(hexString.Length) / 2];
try
{
for (i = 0; i < returnBytes.Length; i++)
{
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
}
}
catch
{
for (i = 0; i < returnBytes.Length; i++)
{
returnBytes[i] = 0;
}
MessageBox.Show("超过16进制范围A-F,已初始化为0", "提示");
}
return returnBytes;
}
}
测试
好了,hex显示 和清除 大家自己搞定哈,,,