AppiumForWindows 菜鸟计划（四）启动服务

看到了那个硕大的三角了么，启动服务就是点它，别犹豫，点吧。

查看主页面文件MainWindowVM.xaml，可以看到启动按钮：

    Command="{Binding LaunchCommand}"

说明该按钮绑定了LaunchCommand，查找：

    public ICommand LaunchCommand    {        get { return _LaunchCommand ?? (_LaunchCommand = new RelayCommand(() => _ExecuteLaunchCommand(), () => _CanExecuteLaunchCommand())); }    }

继续查看：

    private void _ExecuteLaunchCommand()    {        if (_AppiumEngine.IsRunning)        {            _AppiumEngine.Stop();        }        else        {            _AppiumEngine.Start();        }    }

接着我们就找到了真正执行启动服务的地方了：

    public void Start()    {        //setup runner        AppiumServerRunner setup = new AppiumServerRunner(this._NodePath, this._AppiumPackageFolder, _Settings);        // setup basic process info        var appiumServerProcessStartInfo = new ProcessStartInfo();        appiumServerProcessStartInfo.WorkingDirectory = setup.WorkingDirectory;        appiumServerProcessStartInfo.FileName = setup.Filename;        appiumServerProcessStartInfo.Arguments = setup.GetArgumentsCmdLine() + " --log-no-color";        appiumServerProcessStartInfo.RedirectStandardOutput = true;        appiumServerProcessStartInfo.RedirectStandardError = true;        appiumServerProcessStartInfo.CreateNoWindow = true;        appiumServerProcessStartInfo.UseShellExecute = false;        //set up the process and allow the thread to start it        _AppiumServerProcess = new Process();        _AppiumServerProcess.StartInfo = appiumServerProcessStartInfo;        _AppiumServerProcess.OutputDataReceived += _Process_OutputDataReceived;        _AppiumServerProcess.ErrorDataReceived += _Process_ErrorDataReceived;        this._ServerExitMonitorThread = new Thread(() =>        {            _FireOutputData("Starting Node Server");            _OnRunningChanged(true);            this._AppiumServerProcess.Start();            this._AppiumServerProcess.BeginOutputReadLine();            this._AppiumServerProcess.BeginErrorReadLine();            this._AppiumServerProcess.WaitForExit();            _OnRunningChanged(false);            _FireOutputData("Node Server Process Ended");        });        this._ServerExitMonitorThread.Name = "Server Exit Monitor";        this._ServerExitMonitorThread.Priority = ThreadPriority.BelowNormal;        this._ServerExitMonitorThread.Start();    }

额，整体来说就是new 一个ProcessStartInfo，各种初始化，各种赋值，然后交给新new的 Process，再然后起一个Thread，再在然后，执行……
appiumServerProcessStartInfo的详细信息：

如果仔细看上边的代码，就会发现，其实启动和停止走的是同一条路，只不过通过if (_AppiumEngine.IsRunning)进行判断，结束自然调用的就是stop了，没啥可说的了……

        public void Stop()        {            if (IsRunning && null != _ServerExitMonitorThread && _ServerExitMonitorThread.IsAlive && null != _AppiumServerProcess)            {                _AppiumServerProcess.OutputDataReceived -= _Process_OutputDataReceived;                _AppiumServerProcess.ErrorDataReceived -= _Process_ErrorDataReceived;                _AppiumServerProcess.Kill();                _AppiumServerProcess.Dispose();                _AppiumServerProcess = null;                _FireOutputData("Killed Node Server.");                _OnRunningChanged(false);            }        }