Function xiGetImage 

pub unsafe extern "C" fn xiGetImage(
    hDevice: HANDLE,
    timeout: DWORD,
    img: LPXI_IMG,
) -> XI_RETURN

\brief Return pointer to image structure

Allows the user to retrieve the frame into LPXI_IMG structure.

@param[in] hDevice handle to device @param[in] timeout time interval required to wait for the image (in milliseconds). @param[out] img pointer to image info structure @return XI_OK on success, error value otherwise.