C 库函数 --- sscanf() 从字符串中获取数据到变量

可以从字符串中获取需要的参数，如下：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
   int day, year;
   char weekday[20], month[20], dtm[100];

   strcpy( dtm, "Saturday March 25 1989" );
   sscanf( dtm, "%s %s %d  %d", weekday, month, &day, &year );

   printf("%s %d, %d = %s\n", month, day, year, weekday );
    
   return(0);
}

March 25, 1989 = Saturday

 其他高端用法：

uri = "rtsp://172.18.16.158:10554/udp/av0_0"
sscanf(uri, "rtsp://%[0-9.]:%hu%*s", ip_addr, &port)