typedef struct{int audio_volume;int tone_volume;int networkMode;char sn[32];char reamin[2048 - 32 -sizeof(int)* 3];}sys_params_t;// 编译时断言 #define COMPILE_TIME_ASSERT(cond,msg)\ extern char __compile_time_assertion_##msg[(cond)? 1:-1] COMPILE_TIME_ASSERT(sizeof(sys_params_t)== 2048,sys_params_t_size_must_be_2048);