c# - 使用 BackgroundWorker.Backgroundworker 显示命令提示符输出

Question

我有一个使用异步后台工作程序执行批处理文件的程序。这是代码:

public static void Execute(CmdObj obj, bool batch)
{
    CmdObj = obj;

    var theWorker = new BackgroundWorker();
    theWorker.RunWorkerCompleted += WorkerCompleted;
    theWorker.WorkerReportsProgress = true;

    if(batch)
    {
        theWorker.DoWork += WorkerBatchWork;
    }else{
        theWorker.DoWork += WorkerCommandWork;
    }
    theWorker.RunWorkerAsync();

}

private static void WorkerBatchWork(object sender, DoWorkEventArgs e)
{
    RunBatch(CmdObj);
}

private static void WorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    var temp = Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase);
    if (temp != null)
        ProgramPath = temp.Substring(6);

    WriteLog(CmdObj.Activity, false);
    WriteLog(CmdObj.Error, true);

    CmdObj.TheButton.Enabled = true;
}

private static void RunBatch(CmdObj obj)
{
    var process = new Process();
    var startInfo = new ProcessStartInfo
                        {
                            FileName = obj.SrcFile,
                            WindowStyle = ProcessWindowStyle.Normal,
                            CreateNoWindow = false,
                            RedirectStandardInput = true,
                            RedirectStandardOutput = false,
                            RedirectStandardError = true,
                            UseShellExecute = false
                        };


    try
    {
        if (!obj.SrcFile.ToLower().Trim().EndsWith(".bat"))
            throw new FileLoadException("Not a valid .bat file",obj.SrcFile);

        process.StartInfo = startInfo;
        process.Start();
        process.WaitForExit();

        //obj.Activity = process.StandardOutput.ReadToEnd();
        obj.Error = process.StandardError.ReadToEnd();

    }
    catch (Exception ex)
    {
        obj.Exception = ex;
    }
    finally
    {
        process.Close();
    }
}

class CmdObj
{
    public string Command { get; set; }
    public string SrcFile { get; set; }
    public string Activity { get; set; }
    public string Error { get; set; }
    public Exception Exception { get; set; }
    public Button TheButton { get; set; }
}

所以当我运行这个程序并选择一个批处理文件来执行时，我得到一个空白的 CMD 窗口。当我的程序执行批处理文件时，有什么方法可以在 CMD 窗口中显示输出吗？或者，如果我可以将 CMD 输出发送到文本框或其他控件(实时)，那也可以。

谢谢!

Answer 1

由于您将以下属性之一设置为 true，您将得到一个空白的黑色窗口

RedirectStandardInput
RedirectStandardOutput
RedirectStandardError 

这实际上会发生，因为您已经告诉您的应用程序从目标进程接收/发送输出/输入

我看到您正在尝试使用这一行从批处理文件中获取输出

//obj.Activity = process.StandardOutput.ReadToEnd();

不幸的是，除非您将 RedirectStandardOutput 设置为 True 以便您的应用程序能够从目标批处理文件中读取输出，否则这不会起作用。否则，输出将为空

示例

private void RunBatch(CmdObj obj)
{
    var process = new Process();
    var startInfo = new ProcessStartInfo
    {
        FileName = obj.SrcFile,
        WindowStyle = ProcessWindowStyle.Normal,
        CreateNoWindow = false,
        RedirectStandardInput = true,
        RedirectStandardOutput = true, //This is required if we want to get the output
        RedirectStandardError = true,
        UseShellExecute = false
    };


    try
    {

        if (!obj.SrcFile.ToLower().Trim().EndsWith(".bat"))
        throw new FileLoadException("Not a valid .bat file",obj.SrcFile);

        process.StartInfo = startInfo;
        process.Start();
        process.WaitForExit();

        obj.Activity = process.StandardOutput.ReadToEnd(); //Get the output from the target process
        obj.Error = process.StandardError.ReadToEnd();

    }
    catch (Exception ex)
    {
        obj.Exception = ex;
    }
    finally
    {
        process.Close(); //Terminate the process after getting what is required
    }
}

注意:UseShellExecute 必须为 False 才能使用 RedirectStandardOutput

谢谢，
希望这对您有所帮助:)