[英]My program freeze, before reading from NetworkStream
你好,我是一名学生,我还不习惯 c#。 我正在编写一个带有服务器和客户端的程序,它们通过套接字连接。 我正在尝试实现一种从 stream 读取数据的方法,当数据可用时,使用 while 循环。 如果在读/写 stream 之前使用 MessageBox.Show() 显示消息,我可以避免崩溃。 我不知道为什么没有显示消息的程序不起作用...
public partial class Form1 : Form
{
const int port = 22222;
const string ip = "127.0.0.1";
IPAddress ipServer = IPAddress.Parse(ip);
TcpListener server = null;
TcpClient client = null;
Thread thServer = null;
Thread thClient = null;
NetworkStream dataStream = null;
const int a = 11;
const int n = 251;
string receivedMessage = "";
bool? izbira = null;
public Form1()
{
InitializeComponent();
thServer = new Thread(new ThreadStart(startServer));
thServer.IsBackground = true;
thServer.Start();
}
void startServer() {
server = new TcpListener(ipServer, port);
server.Start();
textBox4.Invoke(new Action(() => textBox4.AppendText("Strežnik: zagnan na: IP: " + ip + ", port:" + port)));
client = new TcpClient();
client = server.AcceptTcpClient();
NetworkStream dataStream = client.GetStream();
textBox4.Invoke(new Action(() => textBox4.AppendText(Environment.NewLine + "Strežnik: Sprejet nov uporabnik")));
if (izbira == true)
{
byte[] message = new byte[1024];
if(dataStream.DataAvailable)
dataStream.Read(message, 0, message.Length);
receivedMessage = Encoding.UTF8.GetString(message);
textBox4.Invoke(new Action(() => textBox4.AppendText(Environment.NewLine + "Strežnik: Dobil sem sporočilo: " + receivedMessage)));
message = new byte[1024];
message = Encoding.UTF8.GetBytes("drugo sporocilo!");
dataStream.Write(message, 0, message.Length);
}
else {
byte[] message = new byte[1024];
message = Encoding.UTF8.GetBytes("serbus");
dataStream.Write(message, 0, message.Length);
}
}
void button1_Click(object sender, EventArgs e) {
if (izbira == null) {
textBox4.Invoke(new Action(() => textBox4.AppendText(Environment.NewLine + "Izbrati morate ali boste datoteko prenesli ali poslali!")));
return;
}
this.button1.Enabled = false;
client = new TcpClient();
IPAddress insertedIp = IPAddress.Parse(textBox1.Text);
client.Connect(insertedIp, Convert.ToInt32(textBox3.Text));
dataStream = client.GetStream();
if (izbira == true)
{
byte[] message = new byte[1024];
message = Encoding.UTF8.GetBytes("hejj");
dataStream.Write(message, 0, message.Length);
message = new byte[1024];
MessageBox.Show("");
while (true)
{
if (dataStream.DataAvailable)
{
dataStream.Read(message, 0, message.Length);
break;
}
}
receivedMessage = Encoding.UTF8.GetString(message);
textBox4.Invoke(new Action(() => textBox4.AppendText(Environment.NewLine + "Strežnik: Dobil sem sporočilo: " + receivedMessage)));
}
else {
byte[] message = new byte[1024];
MessageBox.Show("Serbus");
while (true)
{
if (dataStream.DataAvailable)
{
dataStream.Read(message, 0, message.Length);
break;
}
}
receivedMessage = Encoding.UTF8.GetString(message);
textBox4.Invoke(new Action(() => textBox4.AppendText(Environment.NewLine + "Strežnik: Dobil sem sporočilo: " + receivedMessage)));
}
}
void buttonUpload_Click(object sender, EventArgs e) {
izbira = true;
this.buttonDownload.Enabled = false;
}
void buttonDownload_Click(object sender, EventArgs e) {
izbira = false;
this.buttonUpload.Enabled = false;
this.button2.Text = "Prenesi";
}
现在这主要是猜测,因为我们几乎没有足够的代码来肯定地说什么:
JiT 编译器呢?
它的目的之一是检测死代码。 它削减了它预测不会产生影响的代码。 不幸的是,它仍然只是一个计算机程序,所以会发生误报。 例如,试图强制 x32 框架安装出现 OOM 异常,我不得不 go不让JiT 删除代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace OOM_32_forced
{
class Program
{
static void Main(string[] args)
{
//each short is 2 byte big, Int32.MaxValue is 2^31.
//So this will require a bit above 2^32 byte, or 2 GiB
short[] Array = new short[Int32.MaxValue];
/*need to actually access that array
Otherwise JIT compiler and optimisations will just skip
the array definition and creation */
foreach (short value in Array)
Console.WriteLine(value);
}
}
}
MessageBox 将防止整个 function 被删除为死代码。 向用户输出某些东西总是被假定为“有效果”。 然而,它的单独部分仍然有资格进行死代码检测。
很遗憾,您没有向我们提供最小的、完整的可验证示例。 因此,我们无法真正帮助您进一步弄清楚。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.