C++/CLI Code Snippet - Get local computer IP address

C++/CLI Code Snippet - Get local computer IP address

This .Net C++/CLI code snippet get the IP address from the local machine. This function uses System.Net namespace to get local machine hostname and then get a array of IPAddress objects. Modify the exception handling section to meet your project requirements.

/// <summary>
/// Gets IP addresses of the local computer
/// </summary>
System::String ^GetLocalIP()
{
    System::String ^_IP = nullptr;

    // Resolves a host name or IP address to an IPHostEntry instance.
    // IPHostEntry - Provides a container class for Internet host address information. 
    System::Net::IPHostEntry ^_IPHostEntry = System::Net::Dns::GetHostEntry(System::Net::Dns::GetHostName());

    // IPAddress class contains the address of a computer on an IP network. 
    for each (System::Net::IPAddress ^_IPAddress in _IPHostEntry->AddressList)
    {
        // InterNetwork indicates that an IP version 4 address is expected 
        // when a Socket connects to an endpoint
        if (_IPAddress->AddressFamily.ToString() == "InterNetwork")
        {
            _IP = _IPAddress->ToString();
        }
    }
    return _IP;
}

Here is a simple example showing how to use above function (GetLocalIP) to display local machine IP address.

Console::WriteLine("Local computer IP address : " + GetLocalIP());

This .Net code snippet gets the array of all the IPAddress objects. Use this method if you are writing sockets applications, a computer can have multiple IP addresses with one or more NIC cards.

/// <summary>
/// Gets IP addresses object list from the local computer
/// </summary>
array<System::Net::IPAddress^> ^GetLocalIPList()
{
    // Resolves a host name or IP address to an IPHostEntry instance.
    // IPHostEntry - Provides a container class for Internet host address information. 
    System::Net::IPHostEntry ^_IPHostEntry = System::Net::Dns::GetHostEntry(System::Net::Dns::GetHostName());

    // return a list of IP addresses that are associated with a host. 
    return _IPHostEntry->AddressList;
}

Here is a simple example showing how to use above function (GetLocalIPList) to display all the IP addresses from local machine.

// display all IP addresses of local machine
for each (System::Net::IPAddress ^_IPAddress in GetLocalIPList())
	Console::WriteLine(_IPAddress->ToString());


// display all IP addresses of local machine with addressing scheme
for each (System::Net::IPAddress ^_IPAddress in GetLocalIPList())
	Console::WriteLine(_IPAddress->AddressFamily.ToString() + " = " + _IPAddress->ToString());

C++/CLI Keywords Used:

• DNS
• IPAddress
• GetHostEntry
• IPHostEntry
• AddressList
• AddressFamily
• InterNetwork
• Exception

Code Snippet Information:

• Applies To: Visual Studio, .Net, C++, CLI, DNS, Domain Name System, IPAddress, GetHostEntry, IPHostEntry, AddressFamily, InterNetwork, Socket programming, Networking, Network monitoring
• Programming Language : C++/CLI

External Resources:

• Dns.GetHostEntry Method (String)
• IPHostEntry Class
• IPAddress Class
• IPHostEntry.AddressList Property
• AddressFamily Enumeration
• Exception Class

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