Obtain local ip address

Development Programming & Scripting C++
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1

Hi Guys,

I have a problem obtaining my local ipaddress.
Maybe someone could help, it should be quite straight forward :S.

These lines should give me the ip:

TSharedRef<FInternetAddr> LocalAddr = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->GetLocalBindAddr(*GLog);

FString myLocalIp = LocalAddr->ToString(0);

But i always obtain a ipaddress of 0.0.0.0 in the string.
The same problem i have with the RecvFrom function wich contains a pointer to the remote address.
It also returns 0’s all the time :frowning:

Any help would be appreciated.
Thanks in advance.

Cheers.

B

2

Hi,

I’m using GetLocalHostAddr for the local IP (the IP that is used to communicate with your router).

here is some sample code:

bool canBind = false;
TSharedRef<FInternetAddr> localIp = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->GetLocalHostAddr(*GLog, canBind);

if (localIp->IsValid())
{
    GLog->Log(localIp->ToString(false)); // if you want to append the port (true) or not (false).
}
3

Hi!
How do I set up the includes for this to work with a “launcher” version of Unreal Engine? I get compilation errors with just #include “SocketSubsystem.h”, so I guess I need to setup dependency modules, but I don’t understand how.

4

It’s been a while since I’ve done this and our networking has changed since then so this might be incorrect… But I think the header file is just “Networking.h” that is a header that includes a bunch of networking headers (sockets, subsystems, ipv4/6, etc). Then in your project’s Build.cs you will need to add the “Networking” module to your “PublicDependencyModuleNames” list.

5

This worked for me:

#include <SocketSubsystem.h>
#include <IPAddress.h>

bool canBind = false;
TSharedRef<FInternetAddr> localIp = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->GetLocalHostAddr(*GLog, canBind);
return (localIp->IsValid() ? localIp->ToString(false) : "");

And in file ProjectName.Build.cs:

PublicDependencyModuleNames.AddRange(new string[] { /*Some more stuff*/ "Sockets" });
6

Works like a charm, thanks! You should upgrade this to an Answer — except I should point out that this always obtains 127.0.0.1 if you run it on Android, which isn’t useful. But it works great on Windows.

7

Thank you! Works great on Windows. Just a warning for others if you’re developing for Android. It has some weird issue that makes it return 127.0.0.1 no matter what, though. I hope they fix it in the near future. I think it’s related to Issue UE-62267

8

I really need this to work in Android on WiFi :frowning:

9

What about iOS? Does it work there?

10

Thank you. Seems to be working now on Android too.

11

For those still stuck
0.0.0.0 isn’t working for some reason

the following have worked for me

	FIPv4Address Addr;
	FIPv4Address::Parse(localIp->ToString(false), Addr);