dy.c

linux d

/*dy.c :to use the lib of my.so under linux---date:041201*/

#include <stdio.h>

#include <dlfcn.h> //包含动态链接功能的接口文件
#define SOFILE "./my.so" //指定动态链接库名字

#define SHARED //定义宏,确认共享,以便引用动态函数
#include "datetime.h"

void main(void)
{
	DATETYPE d;
	TIMETYPE t;
	void *dp;
	char *error;
	
	puts("example of lib");
	printf("example of lib");
	
	dp = dlopen(SOFILE,RTLD_LAZY);
	//RTLD_LAZY as a flag :finished in running the function of the lib
	//another flag is RTLD_NOW, means that all the undefined must be solved before the return of the "dlopen" 
	if(dp == NULL)
	{
		fputs(dlerror(),stderr);
		exit(1);
	}
	getdate = dlsym(dp,"getdate");//定位取日期函数
	error = dlerror();//监测错误
	if(error)
	{
		fputs(error,stderr);
		exit(1);
	}
	
	getdate(&d);//调用此共享函数
	printf("current date:%04d-%02d-%02d\n",d.year,d.mon,d.day);
	
	gettime=dlsym(dp,"gettime");//定位取时间函数
	
	error = dlerror();
	if(error)
	{
		fputs(error,stderr);
		exit(1);
	}
	
	gettime(&t);//调用此共享函数
	printf("current time:%02d:%02d:%02d\n",t.hour,t.min,t.sec);
	
	dlclose(dp);
	
	exit(0);
}