How do I know which process trigger the injected keyboard (backstage?)

Question

My application is detecting the keyboard input, and also the injected flag keyboard.

below is my code, I want to get the process triggered the LLKHF_INJECTED flag keyboard input event.

static LRESULT   CALLBACK    KeyboardHookProc_LL(int   nCode,WPARAM   wparam,LPARAM   lparam)    
{  
	PKBDLLHOOKSTRUCT pPoint;
	int ID = (int)wparam;
	global_params::UserRequestInfo uri;
	HWND fgWindow;
	EventHooker::KeyItem key_params;
	if ( nCode == HC_ACTION ){
		pPoint = PKBDLLHOOKSTRUCT(lparam);
		// pass the key event program generated
		// NOTE: LLKHF_INJECTED means the key down event
		// is stimulated by program using SendInput, but
		// not by User.
		switch ( ID ){
				case WM_SYSKEYDOWN: // ALT+key down send wm_syskeydown
				case WM_KEYDOWN:
					if (WaitForSingleObject(hKeySynMutex, 0) == WAIT_OBJECT_0) {
						if (pPoint->flags & LLKHF_INJECTED)
						{
							//TODO get which process triggered the injected keyboard
							key_params.uri.nInjected = 1;
						}
						else
						{
							key_params.uri.nInjected = 0;
						}
						HandleKeyPressed(key_params);
						ReleaseMutex(hKeySynMutex);
					}
					break;
				case WM_KEYUP:
					break;
				case WM_SYSKEYUP:
					break;
				default:
					break;
		}
		utility::InitSecAuthTimer(FALSE);
	}
next:
	return CallNextHookEx(0,nCode,wparam,lparam);
}