private static IntPtr LowLevelKeyboardProc(Int32 nCode, IntPtr wParam, Win32.KBDLLHOOKSTRUCT lParam)
{
var wParamInt = wParam.ToInt32();
var result = 0;
if (nCode == Win32.HC_ACTION)
{
switch (wParamInt)
{
case Win32.WM_KEYDOWN:
case Win32.WM_SYSKEYDOWN:
case Win32.WM_KEYUP:
case Win32.WM_SYSKEYUP:
result = OnKey(wParamInt, lParam);
break;
}
}
if (result != 0)
{
return(new IntPtr(result));
}
return(Win32.CallNextHookEx(_hook, nCode, wParam, lParam));
}
private static int OnKey(Int32 msg, Win32.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)
{
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 int OnKey(Int32 msg, Win32.KBDLLHOOKSTRUCT key)
{
var result = 0;
foreach (var notificationEntry in NotificationEntries)
{
if (GetFocusWindow() == notificationEntry.WindowHandle && notificationEntry.KeyCode == key.vkCode)
{
var modifierKeys = GetModifierKeyState();
if (notificationEntry.ModifierKeys != 0 && (modifierKeys & notificationEntry.ModifierKeys) == 0)
{
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;
}
}
}
return(result);
}
