getopt_long函数用法

getopt_long函数的原型如下:(#include<getopt.h>)getopt_long(int argc, char * const argv[], const char *optstring, const struct option *longopts,int *longindex);longopts是一个结构体类型,该结构体描述信息如下:struct option{const char *name; //the name of the long optionint has_arg;            //no_argument(0); required_argument(1);optional_argument(2)int *flag;                 //NULL:return val;int val;                    //the value to return}具体的例子: #include<getopt.h> #include<stdio.h> const char *shortopt = "hi:"; struct option longopt[] = { {"help", 0, NULL, 'h'}, {"input", 1, NULL, 'i'} }; int main(int argc, char ** argv){int nextopt = getopt_long(argc, argv, shortopt, longopt, NULL);switch (nextopt){case 'h':printf("this is help option\n");break;case 'i':printf("the string you input is:\n%s\n",optarg);break;}return 0;}测试:./getopt_long -h./getopt_long -i "hello world"