[Dev] something wrong with socket

i want to use socket to connect www.google.com and test it.but there is something wrong with it.

Code:

---

int mysocket = socket(AF_INET,SOCK_STREAM,0);
        NSLog(@"mysocket=%d\n",mysocket);
        struct sockaddr_in sa;
        bzero(&sa, sizeof(sa));
        sa.sin_family = AF_INET;
        sa.sin_port = htons(80);
        sa.sin_addr.s_addr = inet_addr(@"www.google.com");
        int len = sizeof(sa);
       
        int nRet = connect(mysocket,(struct sockaddr *)&sa,len);
        if(nRet == 0)
        {
                NSLog(@"success!\n");
        }
        else
        {
                NSLog(@"error! %d\n",errno);      errno=2]
        }


        char buf[] ="GET / 1.0\r\n User-Agent: Mozilla/5.0\r\n accept: */*\r\n\r\n";
        nRet = send(mysocket,buf,sizeof(buf),0);
        if(nRet == sizeof(buf))
        {
                NSLog(@"nRet=%d!\n",nRet);
        }
        else
        {
                NSLog(@"nRet=%d!\n",nRet);
        }
       

       
        if(nRet >0 )
        {
                char buffer[40000];
                bzero(buffer,sizeof(buffer));
                nRet= 0;
                int nTotal = 0;
              while(nRet >0)
              {
                        nRet  = recv(mysocket,&buffer[nTotal],2048,0);
                        if(nRet>0)
                                nTotal+=nRet;
                }
                if(nTotal > 0)
                {
                }
                else
                {
                NSLog(@"recv error\n");
                }
        }
        else
        {
                NSLog(@"send error\n");
        }

---

[Terminal]

2008-01-15 18:11:11.688 hello[560:d03] mysocket=9
2008-01-15 18:11:11.713 hello[560:d03] error! 2
2008-01-15 18:11:11.716 hello[560:d03] nRet=-1!

when i use the following code ,it works ok!!

Code:

---

        NSMutableURLRequest *theRequest;
        NSString* theURL = [NSMutableString stringWithString:@"http://www.google.com"];
        theRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:theURL]
                                                        cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                        timeoutInterval:15.0];       
        [theRequest setHTTPMethod:@"GET"];
        [theRequest setValue:@"*/*\r\n\r\n" forHTTPHeaderField:@"accept"];
        [theRequest setValue:@"Close" forHTTPHeaderField:@"Connection"];
                       
        urlConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

---

Then why? why does the socket run error? Any one can help me?
Thanks to all!