protected override int HookCallbackProcedure(int nCode, int wParam, IntPtr lParam)
{
bool flag = false;
if (nCode > -1 && (this.KeyDown != null || this.KeyUp != null || this.KeyPress != null))
{
GlobalHook.KeyboardHookStruct keyboardHookStruct = (GlobalHook.KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(GlobalHook.KeyboardHookStruct));
bool flag2 = (GlobalHook.GetKeyState(162) & 128) != 0 || (GlobalHook.GetKeyState(3) & 128) != 0;
bool flag3 = (GlobalHook.GetKeyState(160) & 128) != 0 || (GlobalHook.GetKeyState(161) & 128) != 0;
bool flag4 = (GlobalHook.GetKeyState(164) & 128) != 0 || (GlobalHook.GetKeyState(165) & 128) != 0;
bool flag5 = GlobalHook.GetKeyState(20) != 0;
KeyEventArgs keyEventArgs = new KeyEventArgs((Keys)(keyboardHookStruct.vkCode | (flag2 ? 131072 : 0) | (flag3 ? 65536 : 0) | (flag4 ? 262144 : 0)));
switch (wParam)
{
case 256:
case 260:
if (this.KeyDown != null)
{
this.KeyDown(this, keyEventArgs);
flag = (flag || keyEventArgs.Handled);
}
break;
case 257:
case 261:
if (this.KeyUp != null)
{
this.KeyUp(this, keyEventArgs);
flag = (flag || keyEventArgs.Handled);
}
break;
}
if (wParam == 256 && !flag && !keyEventArgs.SuppressKeyPress && this.KeyPress != null)
{
byte[] array = new byte[256];
byte[] array2 = new byte[2];
GlobalHook.GetKeyboardState(array);
if (GlobalHook.ToAscii(keyboardHookStruct.vkCode, keyboardHookStruct.scanCode, array, array2, keyboardHookStruct.flags) == 1)
{
char c = (char)array2[0];
if ((flag5 ^ flag3) && char.IsLetter(c))
{
c = char.ToUpper(c);
}
KeyPressEventArgs e = new KeyPressEventArgs(c);
this.KeyPress(this, e);
flag = (flag || keyEventArgs.Handled);
}
}
}
int result;
if (flag)
{
result = 1;
}
else
{
result = GlobalHook.CallNextHookEx(this._handleToHook, nCode, wParam, lParam);
}
return(result);
}