Create 2024-12-20-c# Win32APi SendMessage 发送字符串到其他应用输入框.md

MisterChangRay · Dec 20, 2024 · c09877a · c09877a
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diff --git a/_posts/2024-12-20-c# Win32APi SendMessage 发送字符串到其他应用输入框.md b/_posts/2024-12-20-c# Win32APi SendMessage 发送字符串到其他应用输入框.md
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+---
+layout: post
+title:  "c# Win32APi SendMessage 发送字符串到其他应用输入框"
+date:   2024-12-20 10:29:20 +0800
+categories:
+      - c#
+      - win32api
+tags:
+      - SendMessage
+      - SendTextMessage
+---
+
+主要是留作记录，今天突然有操作windows窗体程序的需求。 需要自动化输入和点击，方便应用操作。
+
+这里记录了如何查找并发送文本到其他应用输入框, 这里重点查看onclick事件中的逻辑。
+
+首先找到应用窗口，然后遍历并保存所有子窗口。最后调用函数发送即可。 实测密码框也可以发送成功。
+
+
+```c#
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
+using static System.Net.Mime.MediaTypeNames;
+
+namespace testdemo
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+        private List<IntPtr> hwnds = new List<IntPtr>();
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+
+            const uint WM_KEYDOWN = 0x100;
+
+            int hwnd1 = 0;
+            int hwndbtn = 0;
+            int hwndtxt = 0;
+            int hwnm1 = 0;
+            int hwnm2 = 0;
+            // 查找窗口
+            hwnd1 = FindWindow("WindowsForms10.Window.8.app.0.19fd5c7_r3_ad1", "Form1aaaee");
+            //hwnd1 = FindWindow("WindowsForms10.Window.8.app.0.1e09f85_r7_ad1", "AreaCity Geo格式转换工具 Ver:1.3.240505");
+            Console.WriteLine("============");
+
+            //遍历所有子窗口并保存
+            EnumWindowProc childProc = new EnumWindowProc(enumWindowProca);
+            EnumChildWindows(hwnd1, childProc, IntPtr.Zero);
+
+            // 发送字符串到指定输入框消息
+            SendTextMessage(hwnds[0], WM_SETTEXT, 0, UnicodeEncoding.Unicode.GetBytes("ha啊我"));
+
+
+
+        }
+        private  bool enumWindowProca(IntPtr hwnd, IntPtr lParam) {
+            StringBuilder s = new StringBuilder();
+            GetClassName(hwnd, s, 100);
+            Console.WriteLine(s.ToString()) ;
+            Debug.WriteLine(s.ToString());
+            if (s.ToString().Equals("WindowsForms10.Edit.app.0.19fd5c7_r3_ad1")) {
+                hwnds.Add(hwnd);
+            }
+
+            return true;
+           }
+        [DllImport("user32")]
+        private static extern int GetWindowText(IntPtr hWnd, StringBuilder lptrString, int nMaxCount);
+        [DllImport("user32")]
+        private static extern int GetClassName(IntPtr hWnd, StringBuilder lptrString, int nMaxCount);
+
+        private delegate bool EnumWindowProc(IntPtr hwnd, IntPtr lParam);
+
+        [DllImport("user32")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        private static extern bool EnumChildWindows(int window, EnumWindowProc callback, IntPtr lParam);
+
+
+
+        [DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = CharSet.Auto)]
+        private static extern int SendTextMessage(IntPtr hWnd, uint Msg, int wParam, byte[] lParam);
+
+
+        // int hwnd;   //窗口句柄
+        // int process;//进程句柄
+        private const uint LVM_FIRST = 0x1000;
+        private const uint LVM_SETSELECTEDCOLUMN = LVM_FIRST + 140;
+
+        private const uint LVM_GETHEADER = LVM_FIRST + 31;
+        private const uint LVM_SETSELECTIONMARK = LVM_FIRST + 67;
+        private const uint LVM_SETITEMSTATE = LVM_FIRST + 43;
+
+
+        private const uint LVM_GETITEMCOUNT = LVM_FIRST + 4;//获取列表行数
+        private const uint LVM_GETITEMTEXT = LVM_FIRST + 45;//获取列表内的内容
+        private const uint LVM_GETITEMW = LVM_FIRST + 75;
+
+        private const uint HDM_GETITEMCOUNT = 0x1200;//获取列表列数
+
+        private const uint PROCESS_VM_OPERATION = 0x0008;//允许函数VirtualProtectEx使用此句柄修改进程的虚拟内存
+        private const uint PROCESS_VM_READ = 0x0010;//允许函数访问权限
+        private const uint PROCESS_VM_WRITE = 0x0020;//允许函数写入权限
+
+        private const uint MEM_COMMIT = 0x1000;//为特定的页面区域分配内存中或磁盘的页面文件中的物理存储
+        private const uint MEM_RELEASE = 0x8000;
+        private const uint MEM_RESERVE = 0x2000;//保留进程的虚拟地址空间,而不分配任何物理存储
+
+        private const uint PAGE_READWRITE = 4;
+
+        private int LVIF_TEXT = 0x0001;
+        private int LVIF_STATE = 0x0008;
+
+
+        [DllImport("user32.dll")]//查找窗口
+        private static extern int FindWindow(
+                                            string strClassName,    //窗口类名
+                                            string strWindowName    //窗口标题
+        );
+
+        [DllImport("user32.dll")]//在窗口列表中寻找与指定条件相符的第一个子窗口
+        private static extern int FindWindowEx(
+                                              int hwndParent, // handle to parent window
+　　                                          int hwndChildAfter, // handle to child window
+                                              string className, //窗口类名            
+                                              string windowName // 窗口标题
+        );
+
+
+        [DllImport("user32.dll")]//在窗口列表中寻找与指定条件相符的第一个子窗口
+        private static extern int FindWindowExW(
+                                              int hwndParent, // handle to parent window
+　　                                          int hwndChildAfter, // handle to child window
+                                              string className, //窗口类名            
+                                              string windowName // 窗口标题
+        );
+        [DllImport("user32.DLL", EntryPoint = "SendMessage", SetLastError = true)]
+        private static extern int SendMessage0(int hWnd, uint Msg, int wParam, StringBuilder lParam);
+
+        [DllImport("user32.DLL", SetLastError = true, CharSet = CharSet.Unicode)]
+        private static extern int SendMessage(int hWnd, uint Msg, int wParam, IntPtr lParam);
+
+        [DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = CharSet.Auto)]
+        private static extern int SendMessageFindItem(int hWnd, uint Msg, int wParam, ref tagLVFINDINFOA lParam);
+
+        [DllImport("user32.DLL")]
+        private static extern int SendMessageKey(int hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
+
+        private struct tagPoint   //结构体
+        {
+            public uint x;
+            public uint y;
+
+        }
+
+
+        /// <summary>
+        /// LVITEM结构体,是列表视图控件的一个重要的数据结构
+        /// 占空间：4(int)x7=28个byte
+        /// </summary>
+        private struct tagLVFINDINFOA   //结构体
+        {
+            public uint flag;
+            public IntPtr psz;
+
+        }
+
+        [DllImport("user32.dll")]//找出某个窗口的创建者(线程或进程),返回创建者的标志符
+        private static extern int GetWindowThreadProcessId(int hwnd, out int processId);
+        [DllImport("kernel32.dll")]//打开一个已存在的进程对象,并返回进程的句柄
+        private static extern int OpenProcess(uint dwDesiredAccess, bool bInheritHandle, int processId);
+        [DllImport("kernel32.dll")]//为指定的进程分配内存地址:成功则返回分配内存的首地址
+        private static extern IntPtr VirtualAllocEx(int hProcess, IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);
+        [DllImport("kernel32.dll")]//从指定内存中读取字节集数据
+        private static extern bool ReadProcessMemory(
+                                            int hProcess, //被读取者的进程句柄
+                                            IntPtr lpBaseAddress,//开始读取的内存地址
+                                            IntPtr lpBuffer, //数据存储变量
+                                            int nSize, //要写入多少字节
+                                            ref uint vNumberOfBytesRead//读取长度
+        );
+        [DllImport("kernel32.dll")]//将数据写入内存中
+        private static extern bool WriteProcessMemory(
+                                            int hProcess,//由OpenProcess返回的进程句柄
+                                            IntPtr lpBaseAddress, //要写的内存首地址,再写入之前,此函数将先检查目标地址是否可用,并能容纳待写入的数据
+                                            IntPtr lpBuffer, //指向要写的数据的指针
+                                            int nSize, //要写入的字节数
+                                            ref uint vNumberOfBytesRead
+        );
+        [DllImport("kernel32.dll")]
+        private static extern bool CloseHandle(int handle);
+        [DllImport("kernel32.dll")]//在其它进程中释放申请的虚拟内存空间
+        private static extern bool VirtualFreeEx(
+                                    int hProcess,//目标进程的句柄,该句柄必须拥有PROCESS_VM_OPERATION的权限
+                                    IntPtr lpAddress,//指向要释放的虚拟内存空间首地址的指针
+                                    uint dwSize,
+                                    uint dwFreeType//释放类型
+        );
+
+
+
+        /// <summary>
+        /// LVITEM结构体,是列表视图控件的一个重要的数据结构
+        /// 占空间：4(int)x7=28个byte
+        /// </summary>
+        private struct LVITEM  //结构体
+        {
+            public int mask;//说明此结构中哪些成员是有效的
+            public int iItem;//项目的索引值(可以视为行号)从0开始
+            public int iSubItem; //子项的索引值(可以视为列号)从0开始
+            public int state;//子项的状态
+            public int stateMask; //状态有效的屏蔽位
+            public int pszText;  //主项或子项的名称
+            public int cchTextMax;//pszText所指向的缓冲区大小
+        }
+
+
+
+
+        public struct COPYDATASTRUCT
+        {
+            public IntPtr dwData; //可以是任意值
+            public int cbData;    //指定lpData内存区域的字节数
+            [MarshalAs(UnmanagedType.LPStr)]
+            public string lpData; //发送给目录窗口所在进程的数据
+        }
+
+        const uint WM_SETTEXT = 0x000C;
+
+        const int BM_CLICK = 0xF5;
+    }
+
+
+}
+```