在用户态下使用uint64_t

#include <stdio.h>#include <stdint.h> typedef struct{unsigned short msg_type;unsigned short msg_len;//msg body len}st_msg_h; typedef struct { char audio_name[64]; uint64_t time_stamp;//输入的要播放的时间戳绝对时间int dec_ch; }st_msg_start; typedef struct{st_msg_h msg_h;//消息头union {int msg_speed;//A_SPEEDst_msg_start msg_start;//A_STRAT}msg_body;}st_audio_msg;int main(){int a, b, c;printf("long long=%d, uint64_t=%d\n", sizeof(long long), sizeof(uint64_t));a = sizeof(st_msg_h);b = sizeof(st_msg_start);c = sizeof(st_audio_msg);printf("a=%d, b=%d, c=%d\n", a, b, c);return 0;}

关键是包含头文件: stdint.h

运行结果:

[feng@other #34]$makegcc -o a a.c[feng@other #35]$./along long=8, uint64_t=8a=4, b=76, c=80