1
두 가지 코드가 있는데, 글로벌 후크를 등록한다는 점에서 매우 유사합니다.글로벌 키보드 후크가 작동하지만 글로벌 쉘 후크가 실패합니다.
public class KeyboardHook : IDisposable
{
#region Events
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void HookEventHandler(object sender, KeyboardHookEventArgs e);
public event HookEventHandler KeyDown;
public event HookEventHandler KeyUp;
#endregion
#region Constants
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private const int WM_SYSKEYDOWN = 0x0104;
private LowLevelKeyboardProc _proc = null;
private static IntPtr _hookID = IntPtr.Zero;
#endregion
#region Imports
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
#endregion
#region Constructor
public KeyboardHook()
{
_proc = new LowLevelKeyboardProc(HookCallback);
_hookID = SetHook(_proc);
}
#endregion
#region Methods
private IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
//if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
if (nCode >= 0 && (wParam == (IntPtr)WM_KEYDOWN || wParam == (IntPtr)WM_SYSKEYDOWN))
{
int vkCode = Marshal.ReadInt32(lParam);
WinForms.Keys key = (WinForms.Keys)vkCode;
if (this.KeyDown != null)
this.KeyDown(this, new KeyboardHookEventArgs(vkCode));
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
#endregion
#region Destructor
public void Dispose()
{
UnhookWindowsHookEx(_hookID);
}
#endregion
}
글로벌 쉘 후크 등록 :
등록 글로벌 키보드 후크 어떤 이유로, 키보드 후크 작품
public enum ShellEvents
{
HSHELL_WINDOWCREATED = 1,
HSHELL_WINDOWDESTROYED = 2,
HSHELL_ACTIVATESHELLWINDOW = 3,
HSHELL_WINDOWACTIVATED = 4,
HSHELL_GETMINRECT = 5,
HSHELL_REDRAW = 6,
HSHELL_TASKMAN = 7,
HSHELL_LANGUAGE = 8,
HSHELL_ACCESSIBILITYSTATE = 11
}
public class ShellHook
{
#region Events
private delegate IntPtr ShellProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void HookEventHandler(object sender, ShellHookEventArgs e);
public event HookEventHandler WindowActivated;
#endregion
#region Constants
private const int WH_SHELL = 10;
private ShellProc _proc = null;
private static IntPtr _hookID = IntPtr.Zero;
#endregion
#region Imports
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,
ShellProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
[DllImport("user32.dll")]
static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);
#endregion
#region Fields
#endregion
#region Constructor
public ShellHook()
{
_proc = new ShellProc(HookCallback);
_hookID = SetHook(_proc);
}
#endregion
#region Methods
private IntPtr SetHook(ShellProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_SHELL, proc,
GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam.Equals(ShellEvents.HSHELL_WINDOWACTIVATED))
{
string windowTitle = GetWindowTitle(wParam);
if (this.WindowActivated != null)
this.WindowActivated(this, new ShellHookEventArgs(windowTitle));
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private string GetWindowTitle(IntPtr hWnd)
{
const int nChars = 256;
StringBuilder Buff = new StringBuilder(nChars);
if (GetWindowText(hWnd, Buff, nChars) > 0)
{
return Buff.ToString();
}
return null;
}
#endregion
#region Destructor
public void Dispose()
{
UnhookWindowsHookEx(_hookID);
}
#endregion
}
을하지만, 쉘 후크 실패 (SetWindowsHookEx 반환 0 콜백에 도달하지 못함).
왜 그런가?