Check if internet connection is available?

General JUCE discussion
1

Hi,
does any of you know if is there is a built-in function in Juce to check if an internet connection is available?
Checked Url class already, but maybe there’s another place. Just making sure I didn’t miss something.
Otherwise, a quick check to see if http://www.google.com gives something back could be an alternative I guess :wink:
Or are there other/better ways?
Koen

2

AFAIK the OSes don’t provide that info - I’d suggest pinging google.com or other big sites as the only reliable way to find out.

3

Alright, that’s what we’ll do.
Thanks for confirming.
Koen

4

Hi Jules,

I'd like as well to test my internet connexion;

Could you write down a sample of code that pings a website, please?

Thanks

5

Just try to read from google.com and see if you get any data back.

6

There are lots of reasons specific bits of internet might not be available as well.  You have to be careful what you test for.  You could easily be in a situation where google is available but other sites aren't.  If you are behind a company proxy server for example, or other random filtering. 

Ping is very unreliable unless you know what you are doing. 

Also - depending on the situation you may get a quick yes or no, or you may have to wait ages for the connection to time-out. 

What are you trying to achieve? 

7

Hi, sorry for trouble, I’ve a simple app that want to check if there’s internet connection, if there’s internet connection this code give me a lot of infos in my console, while if there isn’t my app crashes with this error JUCE Message Thread (1): EXC_BAD_ACCESS (code=1, address=0x0) near the line String result = url.createInputStream( false )->readEntireStreamAsString();

Here my code:

      URL url("https://google.com");
         if (url.isWellFormed())
         {
             String result = url.createInputStream(false)->readEntireStreamAsString();
             if (result == "here something that isn't it means that there's no internet connection")
             {
                 DBG("there's no internet");
             }
        }
8

https://docs.juce.com/master/classURL.html#a51958f3f69f2ecaf3d32a00bc1cd6431

Returns a valid input stream, or nullptr if there was an error trying to open it.

Hence you need to check if url.createInputStream(false) don’t returns nullptr

2 Likes
9

I wrote this aeons ago that does what you need: squarepine_core/NetworkConnectivityChecker.h at main · SquarePine/squarepine_core · GitHub

3 Likes
10

Wow, I look at it, amazing!

1 Like