如何获取 cmd 的输出

本文关键字：cmd 输出 获取 何获取 | 更新日期: 2023-09-27 18:37:00

我想在字符串中获取cmd结果的输出

void getDevices()
{
      Process p = new Process();
      ProcessStartInfo proc = new ProcessStartInfo();
      proc.FileName = @"C:'Users'mehmetcan'Desktop'adt-bundle-windows-x86-20130917'sdk'platform-tools'adb.exe";
      proc.Arguments = @"devices";
      Process.Start(proc);
      String output = p.StandardOutput.ReadToEnd();           
}

错误： 系统中发生"系统无效操作异常"类型的未处理异常.dll

如何获取 cmd 的输出

你必须给你的进程一个ProcessStartInfo，告诉它你将读取输出。

下面是一个示例：

ProcessStartInfo startinfo = new ProcessStartInfo();
startinfo.FileName = @"C:'Users'mehmetcan'Desktop'adt-bundle-windows-x86-20130917'sdk'platform-tools'adb.exe";
startinfo.Arguments = @"devices";
startinfo.RedirectStandardOutput = true;
startinfo.RedirectStandardError = true;
// Note: declare process as a variable in the class as it needs to be used in the event handlers
process = new Process();
process.StartInfo = startinfo;
process.OutputDataReceived += process_DataReceived;
process.ErrorDataReceived += process_DataReceived;
process.Start();
process.BeginOutputReadLine();
process.BeginErrorReadLine();

然后是接收数据的事件处理程序（每次进程输出某些内容时都调用）：

private void process_DataReceived(object sender, DataReceivedEventArgs e)
{
    // null data means we've received everything
    if (e.Data == null) {
        process.CancelOutputRead();
        process.CancelErrorRead();
        return;
    }
    // e.Data is the string with the output from the process
    Console.Write(e.Data);
}

请注意，每当进程输出某些内容时都会调用process_DataReceived，如果您需要的是获得完整的输出，那么您可以这样做：

process_output = ""; // reset output before starting the process
ProcessStartInfo startinfo = new ProcessStartInfo();
startinfo.FileName = @"C:'Users'mehmetcan'Desktop'adt-bundle-windows-x86-20130917'sdk'platform-tools'adb.exe";
startinfo.Arguments = @"devices";
startinfo.RedirectStandardOutput = true;
startinfo.RedirectStandardError = true;
Process process = new Process();
process.StartInfo = startinfo;
process.OutputDataReceived += process_DataReceived;
process.ErrorDataReceived += process_DataReceived;
process.Start();
process.BeginOutputReadLine();
process.BeginErrorReadLine();
// check end of answer if you need to wait for the process to terminate

声明一个对process_DataReceived和process_Exited都可用的字符串变量，例如包含方法的类中的变量：

string process_output; // will accumulate the output of the process

然后是事件处理程序：

private void process_DataReceived(object sender, DataReceivedEventArgs e)
{
    // null data means we've received everything
    if (e.Data == null) {
        process.CancelOutputRead();
        process.CancelErrorRead();
        // do something with the output:
        Console.Write(process_output);
        return;
    }
    // append the output to the accumulator
    process_output += e.Data;
}
进程

退出后，您仍然可以接收输出数据，因此如果您需要等待进程完成，则可以添加一个标志（布尔值）并仅在收到 process_DataReceived 中的空数据时才将其设置为 false。发生这种情况时，您只能确保已收到流程的所有输出。

从"process_DataReceived"访问用户界面

如果必须从process_DataReceived访问 UI 元素，则可以使用其调度程序来实现。下面是一个示例：

private void process_DataReceived(object sender, DataReceivedEventArgs e)
{
    // null data means we've received everything
    if (e.Data == null) {
        process.CancelOutputRead();
        process.CancelErrorRead();
        // with WPF:
        mylabel.Dispatcher.Invoke(new Action(() => {
            mylabel.Content = process_output;
        }));
        // with WinForms
        mylabel.Invoke((MethodInvoker) (() =>
        {
            mylabel.Text = process_output;
        }));
        return;
    }
    // append the output to the accumulator
    process_output += e.Data;
}

像这样尝试怎么样：-

public static void Main()
    {
        ProcessStartInfo proc = new ProcessStartInfo();
        proc.FileName = @"C:'Users'mehmetcan'Desktop'adt-bundle-windows-x86-20130917'sdk'platform-tools'adb.exe";
         proc.Arguments = @"devices";
        Process p = Process.Start(proc);
        p.OutputDataReceived += (sender, e) => Console.WriteLine(e.Data);
        p.BeginOutputReadLine();
        p.Start();
        p.WaitForExit();
        Thread.Sleep(5000);
    }

另请检查 Process.OutputDataReceived 和 Process.BeginOutputReadLine

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