Question

我写了编程以获取有关Android设备的信息我使用外部流程创建类apktool：这段代码

命名空间dream_tool { class apktool {

    public StringBuilder output = new StringBuilder();
    public Process cmd = new Process();

    public string RunExternalPing(string a)
    {


        cmd.StartInfo.FileName = "cmd.exe";
        cmd.StartInfo.UseShellExecute = false;
        cmd.StartInfo.CreateNoWindow = true;
        cmd.StartInfo.RedirectStandardOutput = true;
        cmd.StartInfo.RedirectStandardInput = true;
        cmd.StartInfo.Arguments = a;
        cmd.EnableRaisingEvents = true;
        cmd.OutputDataReceived +=
           new DataReceivedEventHandler(cmd_OutputDataReceived);
        //cmd.Exited += new EventHandler(cmd_Exited);
        cmd.Exited += new EventHandler(Form1.instance.cmd_Exited);

        cmd.Start();
        cmd.BeginOutputReadLine();
        cmd.WaitForExit();


        //   StreamWriter sw = cmd.StandardInput;
        //sw.WriteLine(a);

        // cmd.WaitForExit();

        // sw.Close();

        return a;
    }



    private void cmd_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        Form1 frm = new Form1();

        if (!String.IsNullOrEmpty(e.Data))
        {
            output.Append(e.Data + Environment.NewLine);
        }
        cmd.CancelOutputRead();



    }



}

} 并以此代码的形式

public partial class Form1 : Form
{
    public static Form1 instance;
    apktool a2;
    Procees_adb a1 = new Procees_adb();
    List<String> fullFileName;

    public Form1()
    {

        InitializeComponent();
        instance = this;
        a2 = new apktool();

    }

public void cmd_Exited（object sender，EventArgs e） {

        if (RCH_OUT.InvokeRequired)
        {
            RCH_OUT.Invoke(new EventHandler(delegate { RCH_OUT.Text = (a2.output.ToString()); }));
        }
        else
        {
            RCH_OUT.Text = (a2.output.ToString());
            MessageBox.Show(a2.output.ToString());
        }
        if(IsDisposed)
        {
            a2.cmd.Dispose();
        }


        //cmd.Dispose();
    }

private void button2_Click（object sender，EventArgs e） {

         a2.RunExternalPing("/c adb shell getprop ro.product.cpu.abi");


    }
}

[当我第一次按下按钮时，我得到信息，那很好 1

如果我再次按下它它显示我在cmd.BeginOutputReadLine（）;

上的错误

System.InvalidOperationException：＆＃39;已经在流上启动了异步读取操作。＆＃39; enter image description here

通过添加cmd.CancelOutputRead（）;

解决第一个问题

到

        private void cmd_OutputDataReceived(object sender, DataReceivedEventArgs e)

但是现在当第二次按下按钮信息重复时比如图中的那个 enter image description here

System.InvalidOperationException：＆＃39;已在流上启动异步读取操作

0 个答案: