UI Automation技术获取cmd或Powershell命令提示符窗口的实时内容

事先打开的Powershell或cmd窗口中的文本，用其他方式难以拿到。但是用UI Automation可以轻松获取。
本工具在窗体上加入了一个Timer控件，每秒钟都查找桌面上是否有Powershell或cmd窗口，如果有就获取文本区域的内容。
代码如下：

using System;
using System.Windows.Automation;
using System.Windows.Forms;
using System.Text.RegularExpressions;
namespace PowerShellTracker_CS
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            PropertyCondition PC1 = new PropertyCondition(property: AutomationElement.ControlTypeProperty, value: ControlType.Window);
            PropertyCondition PC2 = new PropertyCondition(property: AutomationElement.ClassNameProperty, value: "ConsoleWindowClass");
            AutomationElement PS = AutomationElement.RootElement.FindFirst(scope: TreeScope.Children, condition: new AndCondition(PC1,PC2));
            if (PS == null)
            {}
                else
            {PropertyCondition PC3 = new PropertyCondition(property: AutomationElement.NameProperty, value: "Text Area");
                PropertyCondition PC4 = new PropertyCondition(property: AutomationElement.ControlTypeProperty, value: ControlType.Document);
                AutomationElement TA = PS.FindFirst(scope: TreeScope.Children, condition: new AndCondition(PC3, PC4));
                if(TA == null)
                {
                    textBox1.Text = "未找到窗口。";
                }
                else
                {
                    TextPattern TP = (TextPattern)TA.GetCurrentPattern(TextPattern.Pattern);
                    System.Windows.Automation.Text.TextPatternRange TR = TP.DocumentRange;
                    string Source= TR.GetText(-1);                   
                    MatchCollection MC= Regex.Matches(Source, ".+");
                    Source ="";
                    string LastLine = "";
                    foreach(Match match in MC)
                    {
                        if (match.Value == "\r")
                        { }
                        else
                        {
                            Source += match.Value + "\r\n";
                            LastLine = match.Value;
                        }
                    }
                    textBox1.Text = Source + "最后一行是：" + LastLine;
                    textBox1.SelectionStart = textBox1.TextLength;
                    textBox1.ScrollToCaret();
                }
            }

        }
    }
}
 

Imports System.Windows.Automation
Imports System.Windows.Forms
Imports System.Text.RegularExpressions
Public Class Form1
    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        Dim PC1 As PropertyCondition = New PropertyCondition([property]:=AutomationElement.ControlTypeProperty, value:=ControlType.Window)
        Dim PC2 As PropertyCondition = New PropertyCondition([property]:=AutomationElement.ClassNameProperty, value:="ConsoleWindowClass")
        Dim PS As AutomationElement = AutomationElement.RootElement.FindFirst(scope:=TreeScope.Children, condition:=New AndCondition(PC1, PC2))

        If PS Is Nothing Then
        Else
            Dim PC3 As PropertyCondition = New PropertyCondition([property]:=AutomationElement.NameProperty, value:="Text Area")
            Dim PC4 As PropertyCondition = New PropertyCondition([property]:=AutomationElement.ControlTypeProperty, value:=ControlType.Document)
            Dim TA As AutomationElement = PS.FindFirst(scope:=TreeScope.Children, condition:=New AndCondition(PC3, PC4))

            If TA Is Nothing Then
                TextBox1.Text = "未找到窗口。"
            Else
                Dim TP As TextPattern = CType(TA.GetCurrentPattern(TextPattern.Pattern), TextPattern)
                Dim TR As Text.TextPatternRange = TP.DocumentRange
                Dim Source As String = TR.GetText(-1)
                Dim MC As MatchCollection = Regex.Matches(Source, ".+")
                Source = ""
                Dim LastLine As String = ""
                For Each match As Match In MC
                    If match.Value = vbCr Then
                    Else
                        Source += match.Value & vbCrLf
                        LastLine = match.Value
                    End If
                Next
                TextBox1.Text = Source & "最后一行是：" & LastLine
                TextBox1.SelectionStart = TextBox1.TextLength
                TextBox1.ScrollToCaret()
            End If
        End If
    End Sub
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load
        With Me.Timer1
            .Interval = 1000
            .Enabled = True
        End With
    End Sub
End Class