将cmd输出重定向到文本框

问题描述 投票:0回答:2

我正在将“命令提示符”重新创建到Windows窗体中。该应用程序无法正常运行;而且我不知道为什么。

加载表单时,它可以运行cmd.exe(将cmd信息加载到“ TextBox_Receive”中,但是没有);并且在“ textBox_send”中写入任何命令(发送输入)之后;仅在按“ Enter”键2或3次后才会显示输入。

知道我在这里缺少什么吗?

public partial class Form1 : Form
{
    // Global Variables:
    private static StringBuilder cmdOutput = null;
    Process p;
    StreamWriter SW;

    public Form1()
    {
        InitializeComponent();
        textBox1.Text = Directory.GetCurrentDirectory();
        // TextBox1 Gets the Current Directory
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        checkBox1.Checked = true;
        // This checkBox activates / deactivates writing commands into the "textBox_Send"

        cmdOutput = new StringBuilder("");
        p = new Process();

        p.StartInfo.FileName = "cmd.exe";
        p.StartInfo.UseShellExecute = false;
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.RedirectStandardInput = true;
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.RedirectStandardError = true;
        p.EnableRaisingEvents = true;

        p.OutputDataReceived += new DataReceivedEventHandler(SortOutputHandler);

        p.Start();

        SW = p.StandardInput;

        p.BeginOutputReadLine();
        p.BeginErrorReadLine();            
    }

    private static void SortOutputHandler(object sendingProcess, DataReceivedEventArgs outLine)
// I dont actually understand this part of the code; as this is a "copy" of a snippet i found somewhere. Although it fixed one of my issues to redirect.
    {
        if (!String.IsNullOrEmpty(outLine.Data))
        {
            cmdOutput.Append(Environment.NewLine + outLine.Data);
        }
    }

    private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        // Send "Enter Key" - Send Command
        if (e.KeyChar == 13)
        {
            SW.WriteLine(txtbox_send.Text);
            txtbox_receive.Text = cmdOutput.ToString();
            txtbox_send.Clear();
        }
    }

    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        // Enable / Disable Sending Commands
        if (checkBox1.Checked)
            txtbox_send.Enabled = true;
        else
            txtbox_send.Enabled = false;
    }
}

}

c# redirect cmd output
2个回答
1
投票

我认为您的问题是使用OutputDataReceived。在documentation

该事件在异步读取操作期间启用标准输出。要启动异步读取操作,您必须重定向流程的StandardOutput流,添加事件处理到OutputDataReceived事件,然后调用BeginOutputReadLine。此后,每次处理时都会发出OutputDataReceived事件信号将一行写到重定向的StandardOutput流,直到进程退出或调用CancelOutputRead。

请参阅该页面上的示例代码以获取更多详细信息。

但是-我不确定您是否需要走那条路线。您是否尝试过直接从StandardOutput流中直接读取?


1
投票

您也可以尝试捕获错误数据。

为此:

行后]

p.OutputDataReceived += new DataReceivedEventHandler(SortOutputHandler);

输入此行

p.ErrorDataReceived += new DataReceivedEventHandler(SortOutputHandler);

cmd.exe也可能有问题。

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