public static void OnInitProgress(System.IntPtr callback, System.UInt32 stage, System.UInt32 nowSize, System.UInt32 totalSize)
{
GCHandle handle = GCHandle.FromIntPtr(callback);
mImpCB = (IIPSMobilePufferCallbackInterface)handle.Target;
mImpCB.OnPufferInitProgress(stage, nowSize, totalSize);
}