Re: Network communication with NSFileHandle & NSSocketPort

FROM : Gary L. Wade
DATE : Wed Mar 19 22:00:52 2008

Well, this code works for me whether I have an IP address or domain name in the string:

    addr.sin_addr.s_addr = inet_addr (theCStringInternetAddress);
    if (INADDR_NONE == addr.sin_addr.s_addr)
    {
        struct hostent*    theHostInfo;

        theHostInfo = gethostbyname (theCStringInternetAddress);
        if (NULL != theHostInfo)
        {
            addr.sin_family = theHostInfo->h_addrtype;
            memcpy (&addr.sin_addr.s_addr,
                theHostInfo->h_addr,
                theHostInfo->h_length);
        }
    }

>
>On Mar 19, 2008, at 4:31 PM, Sherm Pendley wrote:
>

>> Looks reasonable. Now if I could only figure out why I forgot about 
>> NSSocketPort...
>>
>> I think maybe I need to write a network app to jog my memory. 
>> Obviously I haven't looked at these classes recently enough. :-)

>
>I couldn't get it to work. Apple's documentation makes it sound like 
>NSSocketPort can work for general network sockets, but a little 
>Googling led me to some old postings that say it was really only ever 
>designed for use with DO and doesn't work as advertised as a full-
>service socket wrapper.
>
>I did get the process as you described working fine in a little test 
>app, except for one thing - I can only get it to work if I provide the 
>address as dot separated octets, like:
>
>    NSString *address = @"66.250.146.128";
>    
>    struct sockaddr_in addr;
>    bzero( &addr, sizeof(struct sockaddr_in));
>         addr.sin_family = AF_INET;
>    addr.sin_addr.s_addr = inet_addr([address UTF8String]);
>    addr.sin_port = htons( 119 );
>
>         int fd = socket( AF_INET, SOCK_STREAM, 0 );
>    
>    
>    if ( connect( fd, (struct sockaddr *)&addr,  sizeof(addr)) < 0 )
>    {
>        NSLog(@"Error connecting");
>        return;
>    }
>    
>    self.fh =[[[NSFileHandle alloc] initWithFileDescriptor:fd] 
>autorelease];
>    [fh writeData:[@"LIST NEWSGROUPS\r\n" dataUsingEncoding: 
>NSUTF8StringEncoding]];
>    [fh readInBackgroundAndNotify];
>    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
>    [nc addObserver:self selector:@selector(finish:) 
>name:NSFileHandleReadToEndOfFileCompletionNotification object:fh];
>    [nc addObserver:self selector:@selector(process:) 
>name:NSFileHandleReadCompletionNotification object:fh];
>
>But I'm darned if I can figure out how to get it to work with a 
>hostname (like @"apple.com"). I've tried using gethostbyname and a few 
>other things I've found on the web, but nothing seems to work except 
>using the octet string, although I'm sure that's just because I 
>haven't worked with sockets in years and am forgetting something 
>really stupid. :)
>
>Thanks for all the help.
>Jeff
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