c# 通过win32 api 得到指定Console application Content

Posted 2020-11-30 小小高

已知的问题：
　 1. 调试的时候会报IO 异常，非调试环境是正常的
   2. Windows 应用程序才可以使用,可以用非windows应用程序包一层

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using windowsApiAcitonSimulation.Win32Action;

namespace winFormTest
{
    static class Program
    {
      






        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool AttachConsole(uint dwProcessId);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern IntPtr GetStdHandle(int nStdHandle);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool ReadConsoleOutputCharacter(IntPtr hConsoleOutput, [Out] StringBuilder lpCharacter, uint length, Coord bufferCoord, out uint lpNumberOfCharactersRead);

        [StructLayout(LayoutKind.Sequential)]
        public struct Coord
        {
            public short X;
            public short Y;
        }


        
        public static string ReadCharacterAt(int x, int y, int length)
        {
            IntPtr consoleHandle = GetStdHandle(-11);

            if (consoleHandle == IntPtr.Zero)
            {
                return null;
            }
            Coord position = new Coord
            {
                X = (short)x,
                Y = (short)y
            };
            StringBuilder result = new StringBuilder(length);
            uint read = 0;
            if (ReadConsoleOutputCharacter(consoleHandle, result, (uint)length, position, out read))
            {
                return result.ToString();
            }
            else
            {
                return null;
            }
        }

        /// <summary>
        /// 关闭进程
        /// </summary>
        /// <param name="processName">进程名</param>
        private static Process GetNgrokProcess(string processName)
        {
            Process[] myproc = Process.GetProcesses();
            foreach (Process item in myproc)
            {
                if (item.ProcessName == processName)
                {
                    return item;
                }
            }
            return null;
        }
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {

            var process = GetNgrokProcess("ngrok");

            //注意要是 Windows 应用程序才可以 AttachConsole成功
            var flag = AttachConsole((uint)process.Id);

            Console.CursorLeft = 0;
            Console.CursorTop = 0;
            string content = ReadCharacterAt(0, 2, 45);

            //if (content?.IndexOf("reconnecting") > -1)
            //{
            //    var ptr = WindowsApiHelp.FindWindow("ConsoleWindowClass", @"ngrok.bat");
            //    if (ptr == IntPtr.Zero)
            //    {
            //        ptr = WindowsApiHelp.FindWindow("ConsoleWindowClass", @"选择ngrok.bat");
            //    }
            //    var pid = GetCurrentProcessID(ptr);
            //    WindowsApiHelp.SendMessage(ptr, WindowsMessages.WM_CLOSE, 0, 0);
            //}



        }

      
    }
}