vale, aqui esta el codigo funcionando
Código PHP:
void SimKey(BYTE VK, bool Down)
{
TInput Input;
ZeroMemory(&Input, sizeof(Input));
Input.type = INPUT_KEYBOARD;
Input.ki.wVk = VK;
Input.ki.wScan = MapVirtualKey(VK, 0);
Input.ki.dwFlags = KEYEVENTF_EXTENDEDKEY;
if(!Down) Input.ki.dwFlags = Input.ki.dwFlags || KEYEVENTF_KEYUP;
SendInput(1, &Input, sizeof(Input));
}