Andreas, James,
Both of your ways to add the port number work! My app can now send/recv data
over Wifi and cell networks seamlessly. This will buy me some time before I can
get around to rearchitecting everything to use the modern URL approach.
Many thanks!!!
-Carl
> On Jan 16, 2018, at 2:11 PM, Andreas Fink <af...@list.fink.org> wrote:
>
> getaddrinfo returns a host's address. The port is not used here. Its more
> like "dnsname" to "ip" translation.
> and your "http" would be looked up in /etc/services file statically. You can
> set port in the struct sockaddr
>
>
> struct addrinfo *addrInfos = NULL;
> int port = 12345;
>
> int res =getaddrinfo("www.myserver.com
> <http://www.myserver.com/>","http", NULL, &addrInfos);
> if(res==0)
> {
> struct addrinfo *thisAddr = addrInfos;
>
> while(thisAddr)
> {
> /* you might only want IPv4 or IPv6 records */
> if(thisAddr->ai_family == AF_INET)
> {
> struct sockaddr_in *sa = (struct sockaddr_in
> *)thisAddr->ai_addr;
> sa->port = htons(port);
>
> /* here your sockaddr is usable for connections over IPv4 to
> port 12345 */
> }
> else if(thisAddr->ai_family == AF_INET6))
> {
> struct sockaddr_in6 *sa6 = (struct sockaddr_in
> *)thisAddr->ai_addr;
> sa6->port = htons(port);
> /* here your sockaddr is usable for connections over IPv6 to
> port 12345 */
> }
>
> /* but there might be more servers in the list....*/
> thisAddr = thisAddr->ai_next;
> }
> freeaddrinfo(addrInfos);
> }
>
>
On Jan 16, 2018, at 1:58 PM, James R Cutler <james.cut...@consultant.com> wrote:
The man page for getaddrinfo implies that
> error = getaddrinfo(“www.myserver.com:12345
> <http://www.myserver.com:12345/>", "http", &hints, &res0);
should rather be
> error = getaddrinfo(“www.myserver.com
> <http://www.myserver.com:12345/>", “12345", &hints, &res0);
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