So, the problem is. How can I specify my Include path in XCode (gcc -I./mypath).

Tap on your project target, and click “Get Info“, tap on “Build” tab and search “Path” as showed in the figure above. Then click on the “Header Search Paths” options and add your favorite include paths for selected target.

When you’re working on Data, probably you store it as a Key-Value Pair on a BTree or something similar, and maybe this key is an aggregation of information… Maybe you’ve one bit of flag, N bytes of ParentKey, and others…

Now, the problem is… How can a “foreign” server sort correctly my keys? The solution is to send to the server the information on how to sort.. or a method to do it… but today, I’m focusing on the first one.

The code below show an implementation in Python of the Generic Key Comparer. At the end of the source code you can find an usage example. The Full Source Code is available here. Generic Key Comparer Source Code.

def __indexOfOne(data, tokens, offset):
   for i in xrange(offset, len(data)):
   if data[i] in tokens:
      return i
   return -1

def rawComparer(data1, data2, comparer):
   typeIds = [ 's', 'u', 'c', 'i', 'f', 'x' ]
   pyBinMap = {
      ('u', 1): 'B', ('u', 2): 'H', ('u', 4):'L', ('u', 8):'Q',
      ('i', 1): 'b', ('i', 2): 'h', ('i', 4):'l', ('i', 8):'q',
      ('f', 4): 'f', ('f', 8): 'd'
   }

   p = i = 0
   while i < len(comparer):
      nextIdx = __indexOfOne(comparer, typeIds, i + 1)
      if (nextIdx < 0): nextIdx = len(comparer)

      format = None
      length = 1 if (i + 1) == nextIdx else int(comparer[i+1:nextIdx])
      if comparer[i] == 's':
         format = str(length) + 's'
      elif comparer[i] == 'c':
         format = 'c'
      elif (comparer[i], length) in pyBinMap:
         format = pyBinMap[(comparer[i], length)]         

      if format != None:
         d1 = struct.unpack(format, data1[p:p+length])[0]
         d2 = struct.unpack(format, data2[p:p+length])[0]

         if d1 < d2:
            return -1
         elif d1 > d2:
            return 1         

      p += length
      i = nextIdx
   return 0

# Usage Example
if __name__ == '__main__':
  data1 = struct.pack('4sLch', 'test', 10, 'A', -3)
  data2 = struct.pack('4sLch', 'test', 10, 'A', -3)
  print 'Equal (test 10 A -3)', rawComparer(data1, data2, 's4u4ci2')

  data1 = struct.pack('4sLch', 'test', 10, 'A', 1)
  data2 = struct.pack('4sLch', 'test', 10, 'A', 0)
  print '(test 10 A 1) > (test 10 A 0)', rawComparer(data1, data2, 's4u4ci2')

  data1 = struct.pack('4sLch', 'test', 10, 'A', 0)
  data2 = struct.pack('4sLch', 'test', 10, 'A', 1)
  print '(test 10 A 0) < (test 10 A 1)', rawComparer(data1, data2, 's4u4ci2')

char str[] = "Hi, I'm a test. (This is just a test). "
             "Join The #qt IRC Channel!"
             "GNU/Linux - theo@gmail.com";
char delims[] = " !\"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~";

char *result = NULL;
result = strtok(str, delims);
while(result != NULL) {
    printf("%s\n", result);
    result = strtok(NULL, delims);
}

…and this is the Qt way.

QString str = "Hi, I'm a test. (This is just a test). "
        "Join The #qt IRC Channel! GNU/Linux - theo@gmail.com";
QString delim = QRegExp::escape(" !\"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~");
QRegExp regexp(QString("[%1]").arg(delim),Qt::CaseSensitive,QRegExp::RegExp2);
qDebug() << str.split(regexp, QString::SkipEmptyParts);

...
unsigned char checkDigest[SHA_DIGEST_LENGTH];
unsigned char shaDigest[SHA_DIGEST_LENGTH];
const char *userKey = "Matteo License";
unsigned char *signature = NULL;
unsigned int signatureLength = 0;

/* Generate Your RSA Key Pair */
RSA *rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);

/* Generate SHA1 of User Key */
SHA1(userKey, strlen(userKey), shaDigest);

/* Create License Key for the User Key */
signature = OPENSSL_malloc(RSA_size(rsa));
signatureLength = RSA_private_encrypt(SHA_DIGEST_LENGTH, shaDigest,
                                 signature, rsa, RSA_PKCS1_PADDING);

/* Check if User Signature is a valid License Key */
if (RSA_public_decrypt(signatureLength, signature, checkDigest,
                                rsa, RSA_PKCS1_PADDING) != SHA_DIGEST_LENGTH)
{
      /* Valid License Key */
} else {
      /* Invalid License Key */
}

free(signature);
RSA_free(rsa);
...

You need to store the RSA Public Key in your app and then give to each user a generated signature, and it’s all.
Ok, this is a really base example (less than 10 lines of code) if you don’t want reinvent a License Key system, take a look at AquaticPrime Framework (http://www.aquaticmac.com/).

function qPing ($host, $port, $timeout = 5) {
    $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
    if ($socket === false) return(1);

    if (!socket_set_nonblock($socket))
        return(2);

    $time = time();
    while (!@socket_connect($socket, $host, $port)) {
        $err = socket_last_error($socket);
        if ($err == 115 || $err == 114) {
            if ((time() - $time) >= $timeout) {
                socket_close($socket);
                return(3);    # Connection timed out.
            }
            usleep(500);
            continue;
        }
        echo $err . ' ' . socket_strerror($err) . "\n";
        return(4);
    }

    socket_close($socket);
    return(0);
}