获取一个窗体上EDit中的文字（基于user32.dll的控件句柄实现）

获取某一窗体上 某一个Edit中的内容，需要使用spy 软件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        [DllImport（“user32.dll“ EntryPoint = “FindWindow“ SetLastError = true）]
        public static extern IntPtr FindWindow（string lpClassName string lpWindowName）;

        [DllImport（“user32.dll“ EntryPoint = “FindWindowEx“ SetLastError = true）]
        public static extern IntPtr FindWindowEx（IntPtr hwndParent IntPtr hwndChildAfter string lpszClass string lpszWindow）;

        [DllImport（“user32.dll“ EntryPoint = “SendMessage“ SetLastError = true CharSet = CharSet.Auto）]
        public static extern int SendMessage（IntPtr hWnd int Msg IntPtr wParam IntPtr lParam）;

        [DllImport（“user32.dll“ EntryPoint = “Sen

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2020-07-30 10:23  WindowsFormsApplication1\
     文件      339456  2020-07-30 10:22  WindowsFormsApplication1\Project1.exe
     目录           0  2020-07-25 08:58  WindowsFormsApplication1\WindowsFormsApplication1\
     文件         187  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\App.config
     文件        3530  2020-07-23 17:16  WindowsFormsApplication1\WindowsFormsApplication1\Form1.Designer.cs
     文件        2777  2020-07-25 08:58  WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs
     文件        5817  2020-07-23 17:16  WindowsFormsApplication1\WindowsFormsApplication1\Form1.resx
     文件         536  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Program.cs
     目录           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\
     文件        1372  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\AssemblyInfo.cs
     文件        2900  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.Designer.cs
     文件        5612  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\Resources.resx
     文件        1111  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.Designer.cs
     文件         249  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\Properties\Settings.settings
     文件        3828  2020-07-24 11:36  WindowsFormsApplication1\WindowsFormsApplication1\WindowsFormsApplication1.csproj
     目录           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\bin\
     目录           0  2020-07-24 11:36  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\
     文件       10240  2020-07-30 10:19  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe
     文件         187  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe.config
     文件       28160  2020-07-30 10:19  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb
     文件       23168  2020-07-30 10:23  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe
     文件         187  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.config
     文件         490  2019-03-19 12:46  WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest
     目录           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\obj\
     目录           0  2020-07-30 10:19  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\
     文件         865  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7217  2020-07-23 17:05  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        1041  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1.sln
     文件           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs
     文件           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs
     文件           0  2020-07-23 16:33  WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs
............此处省略9个文件信息