关于winform屏蔽锁-白红宇

关于winform屏蔽锁

阅读量：6407 次

发布时间：2019-06-23

本文共 4833 字，大约阅读时间需要 16 分钟。

在项目里经常要设计一个窗体全屏，然后屏蔽一些窗体的事件，比如屏蔽开始按钮 alt+F4等等按钮，这里给出示例代码希望对大家有帮助

1         static int hHook = 0; //全局钩子数   2   3         public const int WH_KEYBOARD_LL = 13;  //LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取   4   5         //委托     6         public delegate int HookProc(int nCode, int wParam, IntPtr lParam);   7         event HookProc KeyBoardHookProcedure;   8   9         //键盘Hook结构   10         [StructLayout(LayoutKind.Sequential)]  11         public class KeyBoardHookStruct  12         {
    13             public int vkCode;  14             public int scanCode;  15             public int flags;  16             public int time;  17             public int dwExtraInfo;  18         }  19  20     #region DllImport  21         //设置钩子    22         [DllImport("user32.dll")]  23         public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);  24         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  25         //抽掉钩子    26         public static extern bool UnhookWindowsHookEx(int idHook);  27         [DllImport("user32.dll")]  28         //调用下一个钩子    29         public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);  30  31         [DllImport("kernel32.dll")]  32         public static extern int GetCurrentThreadId();  33  34         [DllImport("kernel32.dll")]  35         public static extern IntPtr GetModuleHandle(string name);  36  37         #endregion  38  39      #region 自定义事件函数  40  41         public void Hook_Start()  42         {
    43             // 安装键盘钩子    44             if (hHook == 0)  45             {
    46                 KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);    47  48                 hHook = SetWindowsHookEx(WH_KEYBOARD_LL,KeyBoardHookProcedure,GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);  49  50                 //如果设置钩子失败.    51                 if (hHook == 0)  52                 {
    53                     Hook_Clear();  54                     //throw new Exception("设置Hook失败!");    55                 }  56             }  57         }  58  59         //取消钩子事件    60         public void Hook_Clear()  61         {
    62             bool retKeyboard = true;  63             if (hHook != 0)  64             {
    65                 retKeyboard = UnhookWindowsHookEx(hHook);  66                 hHook = 0;  67             }  68             //如果去掉钩子失败.    69             if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");  70         }  71  72   //这里添加自己想要的信息处理    73         public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)  74         {
    75           if (nCode >= 0)  76           {
    77               KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));  78               if (kbh.vkCode == 91)  // 截获左win(开始菜单键)  79               {
    80                   return 1;  81               }  82               if (kbh.vkCode == 92)// 截获右win  83               {
    84                   return 1;  85               }  86               //截获Ctrl+Esc  87               if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control)  88               {
    89                   return 1;  90               }  91               //截获alt+f4  92               if (kbh.vkCode == (int)Keys.F4 && (int)Control.ModifierKeys == (int)Keys.Alt)   93               {
    94                   return 1;  95               }  96               //截获alt+tab  97               if (kbh.vkCode == (int)Keys.Tab && (int)Control.ModifierKeys == (int)Keys.Alt)  98               {
    99                   return 1; 100               } 101               //截获Ctrl+Shift+Esc 102               if (kbh.vkCode == (int)Keys.Escape && (int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Shift) 103               {
   104                   return 1; 105               } 106               //截获alt+空格 107               if (kbh.vkCode == (int)Keys.Space && (int)Control.ModifierKeys == (int)Keys.Alt) 108               {
   109                   return 1; 110               } 111               //截获Ctrl+Alt+Delete 112               if ((int)Control.ModifierKeys == (int)Keys.Control + (int)Keys.Alt + (int)Keys.Delete)      113               {
   114                   return 1; 115               } 116 117 118           } 119             return CallNextHookEx(hHook, nCode, wParam, lParam); 120         } 121 122         #endregion 123 124 125         private void frmMain_Load(object sender, EventArgs e) 126       {
   127           Hook_Start(); 128       } 129 130       private void frmMain_FormClosing(object sender, FormClosingEventArgs e) 131       {
   132           Hook_Clear(); 133       }