private static int OnKey(int msg, NativeMethods.KBDLLHOOKSTRUCT key)
{
var result = 0;
foreach (var notificationEntry in NotificationEntries)
{
// It error code is Null, have to ignore the exception
// For some unknow raison, sometime GetFocuseWindows throw an exception
// Mainly when the station is unlocked, or after an admin password is asked
try
{
if (GetFocusWindow() != notificationEntry.WindowHandle || notificationEntry.KeyCode != key.vkCode)
{
continue;
}
var modifierKeys = GetModifierKeyState();
if (!ModifierKeysMatch(notificationEntry.ModifierKeys, modifierKeys))
{
continue;
}
var wParam = new IntPtr(msg);
var lParam = new HookKeyMsgData
{
KeyCode = key.vkCode,
ModifierKeys = modifierKeys,
WasBlocked = notificationEntry.Block
};
if (!PostMessage(notificationEntry.WindowHandle, HookKeyMsg, wParam, lParam))
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (notificationEntry.Block)
{
result = 1;
}
}
catch (Win32Exception e)
{
if (e.NativeErrorCode != 0)
{
throw;
}
}
}
return(result);
}
private static IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, NativeMethods.KBDLLHOOKSTRUCT lParam)
{
var wParamInt = wParam.ToInt32();
var result = 0;
if (nCode != NativeMethods.HC_ACTION)
{
return(NativeMethods.CallNextHookEx(_hook, nCode, wParam, lParam));
}
// ReSharper disable once SwitchStatementMissingSomeCases
switch (wParamInt)
{
case NativeMethods.WM_KEYDOWN:
case NativeMethods.WM_SYSKEYDOWN:
case NativeMethods.WM_KEYUP:
case NativeMethods.WM_SYSKEYUP:
result = OnKey(wParamInt, lParam);
break;
}
return(result != 0 ? new IntPtr(result) : NativeMethods.CallNextHookEx(_hook, nCode, wParam, lParam));
}
