通过inet_addr和gethostbyname获得IP地址有什么区别啊？

richardzhangs

通过inet_addr和gethostbyname获得IP地址有什么区别啊？谢谢

lenovo

inet_addr能得到IP？

heiniaoyuyoulin

inet_addr将字符串转化为IP地址，而gethostbyneme是通过主机名称获得IP地址，两个功能完全不一样

ubuntuer

LZ比较懵^_^    man下这两个函数就清楚了

单眼皮大姐

gethostbyname(char *name)  返回 struct hostent 结构的指针，该域的一个子域关联了主机的IP地址。 其通过主机名获得IP地址，而inet_addr()是将一个点分割的IP地址（如192。168。22。30）转换为32位网络字节顺序的IP地址。楼主自己看看有什么区别。

wxfjx

sin.sin_addr.s_addr = inet_addr("127.0.0.1");

inet_addr 是将字符串“127.0.0.1” 转换成IP地址，

Name: inet_addr
Prototype: uint32_t inet_addr (const char *name)
Description:
This function converts the IPv4 Internet host address name from the standard numbers-and-dots notation into binary data. If the input is not valid, inet_addr returns INADDR_NONE. This is an obsolete interface to inet_aton, described immediately above. It is obsolete because INADDR_NONE is a valid address (255.255.255.255), and inet_aton provides a cleaner way to indicate error return.
Header files: arpa/inet.h

Name: gethostbyname
Prototype: struct hostent * gethostbyname (const char *name)
Description:
The gethostbyname function returns information about the host named name. If the lookup fails, it returns a null pointer.
Header files: netdb.h

[ 本帖最后由 wxfjx 于 2009-12-23 22:39 编辑 ]

@sky

这问题确实有点.....