Metrologic Optimus R, Programming Manual

Page: 155 / 241

Chapter 3 Terminal Specific Function Library 149
name.sin_family = AF_INET;
name.sin_port = htons (3000);
phostent = gethostbyname ("server1.Metrologic.com.tw");
if (!phostent) {
printf ("Can not get IP from DNS server");
.......................
}
memcpy (&name.sin_addr, phostent->h_addr_list[0], 4);
if (connect (s, (struct sockaddr*) &name, sizeof (name)) < 0) {
printf ("Error in Establishing connection");
.......................
}
Description
This routine searches for information by the given host name specified by the
character-string parameter
hnp
. It then returns a pointer to a struct hostent
structure describing an internet host referenced by name.
This routine gets the IP address of the specified host from DNS server.
The IP address of DNS server must be specified when calling
SetNetConfig.
Or, it can be automatically retrieved from DHCP server, if DhcpEnable is
set.
Return If successful, it returns a pointer.
On error, it returns a NULL pointer.
See Also DNS_resolver, gethostbyaddr
getpeername
Purpose To get name of a connected peer.
Syntax int getpeername (SOCKET s, struct sockaddr *name, int *namelen);
s Descriptor identifying a socket
name Pointer to a sockaddr structure receiving the remote IP address
and port number
namelen Pointer to an integer containing the length of
name
Example SOCKET s;
struct sockaddr_in remote_name;
int size_of_name;
........................
size_of_name = sizeof (remote_name);