public static extern bool PlayM4_SetDecCallBackEx(int nPort, DECCBFUN DecCBFun, IntPtr pDest, int nDestSize);
public static extern bool PlayM4_SetDecCallBackMend(int nPort, DECCBFUN DecCBFun, int nUser);
public static extern bool PlayM4_SetDecCallBack(int nPort, DECCBFUN DecCBFun);