Question

c# 编程 屏蔽TAB+ALT组合键

c#中屏蔽TAB+ALT组合键C#调用api做全局键盘hook,网上的都没看懂，直接传个源代码给我吧，谢了

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;namespace FindOtherComputerIp
{
class lockScreen
{
public delegate int HookProc(int nCode, int wParam, IntPtr lParam); //委托
static int hHook = 0;
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，Acrobat Reader会在你截取之前获得键盘。
HookProc KeyBoardHookProcedure;
//键盘Hook结构函数
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
private GCHandle _hookProcHandle;
[DllImport(@"native.dll")]
public extern static bool FuckSysKey(bool enAble); //禁用alt+ctrl+del //设置钩子
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
//抽掉钩子
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll")]
//调用下一个钩子
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam); [DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId(); [DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name); //主进程模块 [DllImport("User32.dll")]
public static extern IntPtr FindWindowEx(IntPtr ph, IntPtr ch, String cn, String wn);
[DllImport("User32.dll")]
public static extern bool ShowWindow(IntPtr hWnd, long nCmdShow); public const uint spi_screensaverrunning = 97;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam, ref bool pvParam, uint fWinIni);

public void Hook_Start()
{

// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);
_hookProcHandle = GCHandle.Alloc(KeyBoardHookProcedure);
hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
KeyBoardHookProcedure,
GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0); //如果设置钩子失败.
if (hHook == 0)
{
Hook_Clear();

}
}
} //取消钩子事件
public void Hook_Clear()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
//如果去掉钩子失败.
if (!retKeyboard) throw new Exception("钩子卸载失败.");
} //这里可以添加自己想要的信息处理
public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{
KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));

if (kbh.vkCode == (int)System.Windows.Forms.Keys.Tab && (int)System.Windows.Forms.Control.ModifierKeys == (int)System.Windows.Forms.Keys.Alt) //截获Alt+Tab
{
return 1;
}
}
return CallNextHookEx(hHook, nCode, wParam, lParam);
}

}
}

Answer 2

最简单方法是使用RegisterHotKey函数。在调用该函数后你的进程会在ALT-TAB按下时比系统先得到通知。然后在你的程序中处理WM_HOTKEY消息.
public class Win32Hook
{

[DllImport("kernel32")]
public static extern int GetCurrentThreadId();

[DllImport( "user32",
CharSet=CharSet.Auto,CallingConvention=CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(
HookType idHook,
HOOKPROC lpfn,
int hmod,
int dwThreadId);

public enum HookType
{
WH_KEYBOARD = 2
}

public delegate int HOOKPROC(int nCode, int wParam, int lParam);

public void SetHook()
{
// set the keyboard hook
SetWindowsHookEx(HookType.WH_KEYBOARD,
new HOOKPROC(this.MyKeyboardProc),
0,
GetCurrentThreadId());
}

public int MyKeyboardProc(int nCode, int wParam, int lParam)
{
//Perform your process
return 0;
}
}

And then you can install the hook procedure by the following code:

Win32Hook hook = new Win32Hook();
hook.SetHook();