Convert IP address to int

 

 

Sometimes there's a need like this , Need to put IP Address conversion into integer storage , Convert to when reading IP Address format

1、 take IP String conversion to integer save

The code is as follows ：

            string address;
            int intAddress;
            string ipAddress;
            while ((address = Console.ReadLine()) != "\\0")
            {
                // take IP Address conversion to byte array 
                byte[] IPArr = IPAddress.Parse(address).GetAddressBytes();

                // Display the contents stored in the byte array , The result is 16 Base display 
                Console.WriteLine(BitConverter.ToString(IPArr, 0, IPArr.Length));

                // Convert byte array to integer 
                intAddress = BitConverter.ToInt32(IPArr, 0);
                Console.WriteLine(intAddress);
                       
            }

            Console.ReadLine();

Running results ：

C0-A8-0A-11  yes IPArr Convert to string Output result of type , It's also 192 168 10 17 Of 16 Base number

285911232 yes IPArr The result of converting to an integer ,C0 It's the lowest , That is to say, the integer is composed of 11-0A-A8-C0 convert to 10 Hexadecimal come , You can try ！

 

2、 take IP The converted integer array is converted to IP Format

It's actually the reverse process of the first part , First convert integer to byte array , Then convert the byte array to IP

The code is as follows ：

 
// Convert an integer to IP
ipAddress = new IPAddress(BitConverter.GetBytes(intAddress)).ToString();

Running results ：

The last line is the original IP

 

3、 summary

  The two processes are mutually inverse ,IP Turn integer ： utilize IPAddress.GetAddressBytes(), obtain IP Byte array format , And then use it BitConverter.ToInt32(), To convert to Int. The algorithm involved , It's nothing more than converting a byte array into 16 Base number , Then the first value of the array is converted into 10 Hexadecimal numbers get integer data ; Integer rotation IP Turn this process around .