c# - 在 C# 中启动应用程序的 linux 服务，该应用程序从 tcp 端口读取并启动 GTK 窗口

Question

我正在使用 C# 和 mono 为 linux (ubuntu 11.04) 编写应用程序。这个应用程序是一个服务器，它从我制作的客户端发送的 tcp 端口 (9898) 读取消息(一个 url)。服务器收到 URL 并弹出一个窗口(gtk 窗口)，我在其中使用 WebKit 从 URL 嵌入 HTML 代码。当我执行程序时一切正常，但我需要这个应用程序在启动时运行，所以我制作了一个在计算机启动时运行的 shell 脚本。该脚本执行这一行“mono NetworkServer.exe &”。当我打开我的计算机时，该进程处于事件状态并且 NetworkServer.exe 正在运行，但是如果我尝试连接客户端，则程序在尝试创建窗口时崩溃。如果我手动启动|重新启动脚本，一切正常，所以问题是在系统启动时启动应用程序。

这是脚本(我删除了一些功能以使其更简单):

#! /bin/sh

### BEGIN INIT INFO
# Provides:             visitord
# Required-Start:       $local_fs $remote_fs $network
# Required-Stop:        $local_fs $remote_fs $network
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    Create a deamon that initializes the NetworkServer.exe
### END INIT INFO

#GLOBAL VARIABLES
ROOT_ID=0                                   # Root ID
USER_ID=$(id -u)                            # User ID of the user who is running the script
PATH=/sbin:/usr/sbin:/bin:/usr/bin          # 
APP_PATH=/usr/bin/NetworkServer.exe         # The path where the Visitor APP is located
RETURN_VALUE=0                              # The return value
APP_PID=`ps -ef | grep $APP_PATH | grep -v grep | awk '{print$2}'`      # The Visitor APP PID 

. /lib/lsb/init-functions



do_start (){
# if it is running do nothing
if [ -n "$APP_PID" ]; then
    echo "The visitord service is already running (pid $APP_PID)"
    RETURN_VALUE=1
else
    if [ -f $APP_PATH ]; then
        mono $APP_PATH &
        APP_PID=$!
        echo "The visitord service is running (pid $APP_PID)"
        RETURN_VALUE=0
    else
        echo "The VisitorApp doesn't exist, or its location has been changed"
        RETURN_VALUE=1
    fi
fi

}

case "$1" in
  start)
    do_start
    exit $RETURN_VALUE
    ;;
  *)
    echo "Usage: visitord start|stop|restart|status" >&2
    exit 3
    ;;
esac

这是 NetworkServer.cs 代码:

using System;
using System.IO;
using System.Net.Sockets;
using System.Threading;

namespace VisitorApp{

public class NetworkServer{

    private int port;
    private TcpListener tcpListener;

    public NetworkServer(int port){
        this.port = port;
    }

    public  void Start(){

        TextWriter tw = File.AppendText("/var/www/Visitor/log.log");

        try{
            this.tcpListener = new TcpListener(this.port);
            this.tcpListener.Start();
            tw.WriteLine(DateTime.Now+" >> Server started");
        }catch{
            tw.WriteLine(DateTime.Now+" >> The port "+this.port+" is already in use");
            return;
        }finally{
            tw.Close(); 
        }

        int clientNo=0;

        while(true){


            System.Net.Sockets.Socket socketForClient = tcpListener.AcceptSocket();
            clientNo++;

            if (socketForClient.Connected){
                tw = File.AppendText("/var/www/Visitor/log.log");
                tw.WriteLine(DateTime.Now+" >> Client["+clientNo+"] is connected");
                NetworkStream networkStream = new NetworkStream(socketForClient);
                StreamReader streamReader = new StreamReader(networkStream);

                string url;
                try{

                    url = streamReader.ReadLine();
                    tw.WriteLine(DateTime.Now+" >> URL from the Client: "+url);
        //The execution stops here!!!!!!
                    new VisitorWindow("Visitor App",url);
                    tw.WriteLine(DateTime.Now+" >> An open window has been closed");
                }catch{
                    tw.WriteLine(DateTime.Now+" The Client didn't send a URL");

                }finally{
                    tw.Close();
                    socketForClient.Close();
                    networkStream.Close();
                    streamReader.Close();
                }


            }
        }
    }

    public static void Main(){

        new Thread(new ThreadStart(
            delegate {
                new NetworkServer(9898).Start();
            })).Start();
    }
}
}

这是 Client.cs 代码:

using System;
using System.IO;
using System.Net.Sockets;

namespace Client{

public class Client{

    private TcpClient clientSocket;
    private string server;
    private int port;
    private string url;

    public Client(string server, int port, string url){
        this.clientSocket = new TcpClient();
        this.server = server;
        this.port = port;
        this.url = url;
    }

    public void Connect(){

        try{
            this.clientSocket.Connect(this.server,this.port);
        }catch{
            Console.WriteLine("Unable to connect to server: "+this.server+" port: "+this.port);
            return;
        }
        NetworkStream serverStream = this.clientSocket.GetStream();
        StreamWriter streamWriter = new System.IO.StreamWriter(serverStream);

        try{

            streamWriter.WriteLine(url);
            streamWriter.Flush();
        }catch{

            Console.WriteLine("Exception writing to the Server");

        }finally{
            this.clientSocket.Close();
            serverStream.Close();
            streamWriter.Close();
        }

    }

    public static void Main(){
        Client c = new Client("localhost",9898,"http://www.stackoverflow.com");
        c.Connect();
    }
}
}

VisitorWindow.cs代码:

using System;
using System.IO;
using Gtk;
using WebKit;

namespace VisitorApp{

public class VisitorWindow {

    private string windowName;
    private string url;
    private Gtk.Window window;
    public TextWriter tw;

    public VisitorWindow(string windowName, string url){
        this.windowName = windowName;
        this.url = url;

        try{
            this.CreateWindow();
        }catch(Exception exc){
            this.tw.WriteLine(DateTime.Now+" >> "+exc.ToString());
        }finally{
            this.tw.Close();    
        }
    }

    public void CreateWindow(){
        this.tw = File.AppendText("/var/www/Visitor/log.log");
        this.tw.WriteLine(DateTime.Now+" >> Before Application.Init");
        Application.Init ();
        this.tw.WriteLine(DateTime.Now+" >> After Application.Init");

        //Set the graphical properties of the window
        this.window = new Gtk.Window (this.windowName);
        this.tw.WriteLine(DateTime.Now+" >> After Gtk.Window (this.windowName)");
        window.SetDefaultSize(1000,800);
        this.tw.WriteLine(DateTime.Now+" >> After window.SetDefaultSize(1000,800)");
        //window.FullScreen();

        //Adding events for actions
        window.DeleteEvent += new DeleteEventHandler (OnWindowDelete);
        this.tw.WriteLine(DateTime.Now+" >> After DeleteEventHandler (OnWindowDelete)");
        //Create the embed content
        ScrolledWindow scroll = new ScrolledWindow ();
        this.tw.WriteLine(DateTime.Now+" >> After new scroll");

        WebView webView = new WebView();
        this.tw.WriteLine(DateTime.Now+" >> After new WebView();");

        webView.Open (this.url);
        this.tw.WriteLine(DateTime.Now+" >>  webView.Open (this.url);");
        scroll.Add (webView);  
        this.tw.WriteLine(DateTime.Now+" >>  scroll.Add (webView);");
        window.Add (scroll);
        this.tw.WriteLine(DateTime.Now+" >>  window.Add (scroll);");

        window.ShowAll();
        this.tw.WriteLine(DateTime.Now+" >>  window.ShowAll()");
        Application.Run ();
        this.tw.WriteLine(DateTime.Now+" >>  Application.Run ");
    }
    void OnWindowDelete (object obj, DeleteEventArgs args){
        Application.Quit();
    }
}
}

日志文件:

04/24/2012 08:23:27 >> Server started
04/24/2012 08:24:56 >> Client[1] is connected
04/24/2012 08:24:56 >> URL from the Client: http://www.stackoverflow.com

日志文件中没有错误，抛出任何异常，只是它崩溃了......任何帮助都会非常有用!!

Answer 1

可能有帮助的一件事是您说当您尝试连接客户端时程序崩溃。错误信息是什么？

我想补充的另一件事是您的 Client.cs 对我来说不合适。可能只是我太挑剔了，但是 Client 类的 Main 方法创建了它自己的一个实例。如何创建 Client 对象？你说当你的 Linux 机器启动时 NetworkServer.exe 正在运行，它只会在你创建客户端时崩溃。