C将sockaddr转换为sockaddr_in

Question

由于某些原因，我的指针需要指向sockaddr而不是sockaddr_in，为了使用sin_family，sin_pot和sin_addr与sockaddr指针，我怎么能转换这两个结构？ 这是我的代码

static int proxy_getaddr(char *HostName, int Port, SockAddrType *Result)
      .......

Result->sin_family=AF_INET;
Result->sin_port=htons((unsigned short)Port);
     ........

memcpy((char*)&Result->sin_addr,(char*)Host->h_addr,sizeof(Result->sin_addr));

正如您可能看到我需要转换的指针是结果，我的控制台错误是

 ‘const struct sockaddr’ has no member named ‘sin_family’
 ‘const struct sockaddr’ has no member named ‘sin_port’
‘const struct sockaddr’ has no member named ‘sin_addr’