سلام دوست عزیز
یک راه اینست که متد ProcessCmdKey مربوط به Form را Override کنید ، به طور مثال برای غیر فعال کردن کلید TAB میتوانید از کد زیر استفاده نمایید :
if (keyData == Keys.Tab)
{
MessageBox.Show("Sorry , Tab Key is disabled!");
return true;
}
else
return base.ProcessCmdKey(ref msg, keyData);
اما برای غیر فعال کردن کلیدهای LWin و RWin در ویندوز اکس پی باید از تکنیک LowLevelKeyboardHoocking و از تابع API به نام LowLevelKeyboardProc استفاده نمایید :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using Microsoft.Win32;
using System.Xml;
using System.Collections;
using System.IO.Ports;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace WindowsApplication64
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public class KeyboardFilter
{
private Keys[] mFilter;
private IntPtr mHook;
private LowLevelKeyboardProc mProc;
public KeyboardFilter(Keys[] keysToFilter)
{
// Install hook
mFilter = keysToFilter;
ProcessModule mod = Process.GetCurrentProcess().MainModule;
mProc = new LowLevelKeyboardProc(KeyboardProc); // Avoid garbage collector problems
mHook = SetWindowsHookEx(13, mProc, GetModuleHandle(mod.ModuleName), 0);
if (mHook == IntPtr.Zero) throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to set hook");
}
public void Dispose()
{
// Release hook
if (mHook != IntPtr.Zero)
{
UnhookWindowsHookEx(mHook);
mHook = IntPtr.Zero;
}
}
private IntPtr KeyboardProc(int nCode, IntPtr wp, IntPtr lp)
{
// Callback, filter key
if (nCode >= 0)
{
KBDLLHOOKSTRUCT info = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT));
foreach (Keys key in mFilter)
if ((key & Keys.KeyCode) == info.key && CheckModifier(key)) return (IntPtr)1;
}
return CallNextHookEx(mHook, nCode, wp, lp);
}
private bool CheckModifier(Keys key)
{
// Check if modifier key in required state
if ((key & Keys.Control) == Keys.Control &&
GetAsyncKeyState(Keys.LControlKey) == 0 && GetAsyncKeyState(Keys.RControlKey) == 0) return false;
if ((key & Keys.Shift) == Keys.Shift &&
GetAsyncKeyState(Keys.LShiftKey) == 0 && GetAsyncKeyState(Keys.RShiftKey) == 0) return false;
if ((key & Keys.Alt) == Keys.Alt &&
GetAsyncKeyState(Keys.LMenu) == 0 && GetAsyncKeyState(Keys.RMenu) == 0) return false;
return true;
}
// P/Invoke declarations
[StructLayout(LayoutKind.Sequential)]
private struct KBDLLHOOKSTRUCT
{
public Keys key;
public int scanCode;
public int flags;
public int time;
public IntPtr extra;
}
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int id, LowLevelKeyboardProc callback, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool UnhookWindowsHookEx(IntPtr hook);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wp, IntPtr lp);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string name);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern short GetAsyncKeyState(Keys key);
}
private void Form1_Load(object sender, EventArgs e)
{
KeyboardFilter filter = new KeyboardFilter(new Keys[] { Keys.LWin, Keys.RWin });
}
}
}
//ref : http://forums.microsoft.com/MSDN/Sho...43470&SiteID=1
چجوری می شه تاثیر یک کلید فشار داده شده رو خنثی کرد؟
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