linux 网络编程 inet_pton & inet_ntop函数

#include <arpa/inet.h>int inet_pton(int family,const char * strptr,void * addrptr); ????返回：1--成功, 0--输入不是有效的表达格式 , -1--出错const char * inet_ntop(int family,const void * addrptr,char * strptr,size_t len);其中len =sizeof(* strptr) ????返回： 指向结果的指针--成功 , NULL--出错程序代码：#include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/ioctl.h>#include <stdlib.h>#include <netdb.h>#include <arpa/inet.h>#include <netinet/in.h>#include <strings.h>int main(int argc,char ** argv){ ???char dst[100]; ???int sockfd = socket(AF_INET,SOCK_STREAM,0); ????struct sockaddr_in serv; ???????memset(&serv,0,sizeof(struct sockaddr_in)); ???????serv.sin_family = AF_INET; ???serv.sin_port = htons(5555); ???//serv.sin_addr.s_addr = INADDR_ANY; ???//以下serv.sin_addr.s_addr可替换为 serv.sin_addr ???if((inet_pton(AF_INET,"127.0.0.1",&serv.sin_addr.s_addr))==0) ???????printf("inet_pton \n"); ???????if((inet_ntop(AF_INET,&serv.sin_addr.s_addr,dst,sizeof(dst)))==NULL) ???????printf("inet_ntop\n"); ???printf("dst=%s,sizeof(dst)=%d\n",dst,sizeof(dst)); ???????bind(sockfd,(struct sockaddr *)&serv,sizeof(serv)); ???listen(sockfd,15); ???return 0;}