C#获取cmd输出，如真实cmd窗口中所示 [英] C# get cmd output just as shown in real cmd window

问题描述

我有一个 BackgroundWorker 线程，该线程运行一个cmd进程并向其中写入多个命令.有些命令可能需要一段时间才能完成，因此我想向用户显示进度的cmd输出.我运行cmd命令的代码如下:

I have a BackgroundWorker thread that runs a cmd process and writes multiple commands to it. Some of the commands may take a while to complete so I want to show the user the cmd output of the progress. My code for running the cmd commands looks like this:

private void backgroundWorker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    var startInfo = new ProcessStartInfo("cmd.exe")
    {
        UseShellExecute = false,
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        CreateNoWindow = true
    };

    cmd = new Process { StartInfo = startInfo };

    cmd.OutputDataReceived += Cmd_OutputDataReceived;
    cmd.Start();
    cmd.BeginOutputReadLine();

    cmd.StandardInput.WriteLine($"cd {baseFolder}\\External Resources\\img files\\uboot");

    string[] commands = CmdCommands.GetUbootFlashCommands();
    foreach (var command in commands)
        cmd.StandardInput.WriteLine(command);

    cmd.StandardInput.WriteLine($"cd {baseFolder}\\External Resources\\img files\\android");
    commands = CmdCommands.GetKernelFlashCommands();
    foreach (var command in commands)
        cmd.StandardInput.WriteLine(command);

    cmd.StandardInput.WriteLine("exit");
    cmd.WaitForExit();
}

private void Cmd_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    Invoke(new Action(() =>
    {
        txtCmd.Text += e.Data + Environment.NewLine;
    }));
}

但是，如常规cmd窗口所示，cmd输出不会丢失实际输出.这是我的输出结果:

But the cmd output loos nothing the real output as shown in a regular cmd window. Here is how my output looks like:

Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.

C:\>cd C:\img files\uboot

C:\img files\uboot>fastboot flash XXX.bin

C:\img files\uboot>fastboot flash XXX.bin

C:\img files\uboot>cd C:\img files\android

C:\img files\android>fastboot flash kernel

C:\img files\android>fastboot flash system XXX.img

C:\img files\android>fastboot flash userdata XXX.img

C:\img files\android>fastboot flash cache XXX.img

C:\img files\android>exit

这是我打开cmd窗口并键入命令时的输出结果:

And here is how output looks like when I open a cmd window and type in the commands:

Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>cd C:\img files\uboot

C:\img files\uboot>fastboot flash bl2 bl2.bin
target didn't report max-download-size
sending 'bl2' (14 KB)...
OKAY [  0.006s]
writing 'bl2'...
OKAY [  0.042s]
finished. total time: 0.052s

C:\img files\uboot>fastboot flash bootloader u-boot.bin
target didn't report max-download-size
sending 'bootloader' (275 KB)...
OKAY [  0.049s]
writing 'bootloader'...
OKAY [  0.046s]
finished. total time: 0.098s

C:\img files\uboot>cd C:\img files\android

C:\img files\android>fastboot flash kernel zImage-dtb
target didn't report max-download-size
sending 'kernel' (5099 KB)...
OKAY [  0.839s]
writing 'kernel'...
OKAY [  0.145s]
finished. total time: 0.988s

C:\img files\android>fastboot flash system system.img
target didn't report max-download-size
sending 'system' (426874 KB)...
OKAY [ 70.327s]
writing 'system'...
OKAY [ 30.963s]
finished. total time: 101.295s

C:\img files\android>fastboot flash userdata userdata.img
target didn't report max-download-size
sending 'userdata' (35680 KB)...
OKAY [  5.895s]
writing 'userdata'...
OKAY [  2.301s]
finished. total time: 8.200s

C:\img files\android>fastboot flash cache cache.img
target didn't report max-download-size
sending 'cache' (6248 KB)...
OKAY [  1.036s]
writing 'cache'...
OKAY [  0.380s]
finished. total time: 1.422s

C:\img files\android>

如何在我的C#代码中获得此输出?

How do I get this output in my my C# code???

推荐答案

正如@Damien_The_Unbeliever和@ user2033402所建议的那样，似乎由于某种原因，我需要的输出重定向到了 StandardError 而不是到 StandardOutput .

As @Damien_The_Unbeliever and @user2033402 has suggested, it seems that for some reason the output I needed was redirected to the StandardError instead of to the StandardOutput.

所以我的解决方案是以下代码:

So the working solution in my case was this code:

private void backgroundWorker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    var startInfo = new ProcessStartInfo("cmd.exe")
    {
        UseShellExecute = false,
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        RedirectStandardError = true,
        CreateNoWindow = true
    };

    cmd = new Process { StartInfo = startInfo };

    cmd.OutputDataReceived += Cmd_OutputDataReceived;
    cmd.ErrorDataReceived += Cmd_ErrorDataReceived;
    cmd.Start();
    cmd.BeginOutputReadLine();
    cmd.BeginErrorReadLine();

    cmd.StandardInput.WriteLine($"cd {baseFolder}\\External Resources\\img files\\uboot");

    string[] commands = CmdCommands.GetUbootFlashCommands();
    foreach (var command in commands)
        cmd.StandardInput.WriteLine(command);

    cmd.StandardInput.WriteLine($"cd {baseFolder}\\External Resources\\img files\\android");
    commands = CmdCommands.GetKernelFlashCommands();
    foreach (var command in commands)
        cmd.StandardInput.WriteLine(command);

    cmd.StandardInput.WriteLine("exit");
    cmd.WaitForExit();
}

private void Cmd_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    Invoke(new Action(() =>
    {
        txtCmd.Text += e.Data + Environment.NewLine;
    }));
}

private void Cmd_ErrorDataReceived(object sender, DataReceivedEventArgs e)
{
    Invoke(new Action(() =>
    {
        txtCmd.Text += e.Data + Environment.NewLine;
    }));
}

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