C++ 获取本机全部IP地址（有不止一个IP的情况）

typedef struct tagIPInfo
{
char ip[30];
}IPInfo;

bool GetLocalIPs(IPInfo* ips,int maxCnt,int* cnt)
{
//1.初始化wsa
WSADATA wsaData;
int ret=WSAStartup(MAKEWORD(2,2),&wsaData);
if (ret!=0)
{
return false;
}
//2.获取主机名
char hostname[256];
ret=gethostname(hostname,sizeof(hostname));
if (ret==SOCKET_ERROR)
{
return false;
}
//3.获取主机ip
HOSTENT* host=gethostbyname(hostname);
if (host==NULL)
{
return false;
}
//4.逐个转化为char*并拷贝返回
*cnt=host->h_length<maxCnt?host->h_length:maxCnt;
for (int i=0;i<*cnt;i++)
{
in_addr* addr=(in_addr*)*host->h_addr_list;
strcpy(ips[i].ip,inet_ntoa(addr[i]));
}
return true;
}