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c#windows-runtimeipv6
DaveUK
DaveUK

Reputation: 1580

C# - WinRT - Convert IPv6 address stored as a byte array to string

I have an IPv6 address provided as a byte[16] array and I would like to convert it to string (for the purpose of logging).

I would normally achieve this in C# using the System.Net.IPAddress constructor, but it seems that System.Net.IPAddress is not available in C# for WinRT/Windows Store. Does anyone have an equivalent way to do this conversion/formatting?

Upvotes: 1

Views: 1360

Answers (3)

Steven Liekens
Steven Liekens

Reputation: 14088

Converting a byte array to a valid IPv6 address is easy enough.

// Precondition: bytes.Length == 16
string ConvertToIPv6Address(byte[] bytes)
{
    var str = new StringBuilder();
    for (var i = 0; i < bytes.Length; i+=2)
    {
        var segment = (ushort)bytes[i] << 8 | bytes[i + 1];         
        str.AppendFormat("{0:X}", segment);
        if (i + 2 != bytes.Length)
        {
            str.Append(':');
        }           
    }

    return str.ToString();
}

Collapsing empty segments is a little more involved, but generally not needed for anything other than display purposes.

Upvotes: 1

DaveUK
DaveUK

Reputation: 1580

I solved this manually by just creating the full IPv6 string two bytes at a time with colon seperator. Then, I passed that string to Windows.Networking.HostName and accessed it's DisplayName property, which gave me back the compressed version (i.e. 0000 replaced with 0 and with a single :: replacement if applicable).

At least HostName saved me some of the work :) It's still a shame that there isn't a full IPAddress replacement though :(

Upvotes: 0

Jonathon Reinhart
Jonathon Reinhart

Reputation: 137398

I believe Windows.Networking.HostName is the replacement for IPAddress.

Edit: But I'm not sure that you can create one from a byte[].

See also:

Upvotes: 0

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