今天闲着无聊,试着用C#写查看密码框的程序(不仅限于密码框,应该是任何有文本的控件都可以) 代码见下面. 用C++实现起来超简单的这么个东东..用C#复杂得很,我又不想用unsafe,我总觉得用unsafe的话,干嘛不干脆用C++算了. int Length=300; IntPtr THandle=APIs.GetLocalWindow();//取得当前鼠标所在位置的控件句柄 int Address=APIs.VirtualAllocEx(Process.GetCurrentProcess().Handle,0,Length,0x1000,0x04);//在本进程内分配Length大小的内存 APIs.SendMessage(THandle,0x000D,new IntPtr(255),new IntPtr(Address));//发送消息到目标控件,0x000D就是WM_GETTEXT,255的意思是保存返回的值,new IntPtr(Address)是指保存到Address指定的地址 byte[] buf=new byte[Length]; APIs.ReadProcessMemory(Process.GetCurrentProcess().Handle,Address,buf,Length,0);//读取刚才保存的内容 MessageBox.Show(Encoding.Default.GetString(buf));//显示出来测试一下. 其中APIs开头的,是我自己写的API类库,相关声明如下: [DllImport("user32.dll")] public static extern IntPtr WindowFromPoint( POINT lpPoint ); [DllImport("user32.dll")] public static extern int GetCursorPos( out POINT lpPoint ); public static IntPtr GetLocalWindow()//这个只是把上两个结合了一下 { POINT point; GetCursorPos(out point); return WindowFromPoint(point); } //不加Ex的话.上面就不用第一个Handle参数了 [ DllImport( "Kernel32.dll" )] public static extern System.Int32 VirtualAllocEx( System.IntPtr hProcess, System.Int32 lpAddress, System.Int32 dwSize, System.Int16 flAllocationType, System.Int16 flProtect ); [DllImport("User32.dll")] public static extern IntPtr SendMessage( IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam ); [ DllImport( "Kernel32.dll" )] public static extern int ReadProcessMemory( System.IntPtr hProcess, System.Int32 lpBaseAddress, byte[] lpBuffer, long nSize, long lpNumberOfBytesWritten ); ******************************************************************* 因为一般要查看的是外部程序,配合快捷键不失不一种好方法. C#的实现如下: 在初始化窗口的代码里加上 KeyModifiers modifiers=KeyModifiers.Windows;//定义为Win+快捷键,也可定义为别的. RegisterHotKey(Handle, 1001,modifiers,Keys.V);//给Win+V分配ID为1001 override一下WndProc protected override void WndProc( ref Message m ) { const int WM_HOTKEY = 0x0312; switch(m.Msg) { case WM_HOTKEY: switch (m.WParam.ToInt32()) { case 1001: OnHotKeyV(); break; default:break; } break; } base.WndProc(ref m ); } 在OnHotKeyV函数里写上我最开始写的那段代码就可以了. 
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