Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name" - C# Discussion Boards

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name"

9-Jul-09 7:20

Get all interfaces again and search for the one with the right name?

Vengeful Emus9-Jul-09 7:38

Vengeful Emus

9-Jul-09 7:38

The call that provices the adapter names has no option to produce the IP addresses assigned to the interface... therein lies the problem--how to find the IP addresses associated with the network interface

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name" [modified*2]

harold aptroot9-Jul-09 7:44

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name" [modified*2]

9-Jul-09 7:44

IIRC they are in the same order as returned by Dns.GetHostAddresses
That worked for me, anyway.
would the person who 1-voted me care to explain why? Did I remember incorrectly? (couldn't you just have told me so?)

Last modified: 18mins after originally posted --

Dave Kreskowiak9-Jul-09 10:31

Dave Kreskowiak

9-Jul-09 10:31

It lokos like you got hit by a Drive-By Univoter...

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Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name"

harold aptroot9-Jul-09 10:39

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name" [modified]

9-Jul-09 10:39

Yes it would seem so.. he didn't drive around the rest of the forum too much though lol Smile | :)

Dave Kreskowiak9-Jul-09 7:51

Dave Kreskowiak

9-Jul-09 7:51

When you call GetAllNetworkInterfaces, each instance of the NetworkInterface object you get back has a GetIpProperties method. Call that method on each interface and you'll get an IpInterfaceProperties object with all the IP address details in it for that adapter.

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Dave Kreskowiak
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Visual Developer - Visual Basic
2006, 2007, 2008

modified on Thursday, July 9, 2009 4:29 PM

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name"

harold aptroot9-Jul-09 8:05

Re: How do I retreive and interface's IP Address(es) when starting only with "Friendly Adapter Name"

9-Jul-09 8:05

That would be better than my less-than-reliable approach.

Luc Pattyn9-Jul-09 9:20

Luc Pattyn

9-Jul-09 9:20

Hi Harold,

I'm not the one that onevoted you, however since I liked your latest message much more than the previous one, here is a 5.

Smile | :)

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Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

search for nearby wifi networks

Vivek Vijayan9-Jul-09 6:54

Vivek Vijayan

9-Jul-09 6:54

I'm writing a Windows Mobile 6 application in C#.NET. how can i search for wifi connections nearby and get ip

This code was posted by me...

Re: search for nearby wifi networks

Vasudevan Deepak Kumar10-Jul-09 2:26

Vasudevan Deepak Kumar

10-Jul-09 2:26

Didn't you already asked here?

http://www.codeproject.com/Messages/3113762/list-all-wi-fi-network-connections.aspx[^]

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list all wi-fi network connections

Vivek Vijayan9-Jul-09 6:40

Vivek Vijayan

9-Jul-09 6:40

1 want to list all wi-fi network connections using C#.

This code was posted by me...

Blue_Boy9-Jul-09 6:55

Blue_Boy

9-Jul-09 6:55

Try a google search.[^]

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Mycroft Holmes9-Jul-09 11:52

Mycroft Holmes

9-Jul-09 11:52

I love it, I thought I'll take a look at the results for this one. 1st link is to CP, straight back to this message Laugh | :laugh:

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Blue_Boy9-Jul-09 13:16

Blue_Boy

9-Jul-09 13:16

Yeah,it's intersing result search Laugh | :laugh:

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If my post helps you kindly save my time by voting my post.

own == Operator and null Problem [solved]

Vasudevan Deepak Kumar10-Jul-09 2:26

Vasudevan Deepak Kumar

10-Jul-09 2:26

Blue_Boy wrote:
intersing result search

Latest page update phenomenon is the reason that is causing Google to bring this page on top.

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And miles to go before I sleep!

chrisx519-Jul-09 6:34

9-Jul-09 6:34

Hallo Board,
I am facing a problem with a self-written Equal Operator on a list<> class with own classes inside the list.
I want to compare lists thus I redefined the == Operator:

public override bool Equals(object obj)<br />
{<br />
UserList compUserList = (UserList)obj;<br />
foreach (PersonDataSet user in compUserList.list)<br />
{<br />
.... //unimportend internal checks;if all users are the same I want to return true<br />
return true;<br />
}<br />
return false;<br />
}<br />

The problem is now that I checked in my code before writing the own operator if a special UserList has already been created by

if (testUserList != null)

.
Now I get a NullPointer exception wenn testing for 'null'.
This is understandable, but does anyone have an idea how to solve the problem? Maybe a different check to test if an object has been created? Or is a check like this not good at all?

Thanks for your replies!

Regards
Chris

modified on Monday, July 13, 2009 5:32 AM

harold aptroot9-Jul-09 6:51

9-Jul-09 6:51

The operator == is not the same as the Equals method. Even the result can sometimes differ (as is the case with NaN's in float comparisons)
If you want to overload the == operator you would have to overload it.

chrisx519-Jul-09 23:18

9-Jul-09 23:18

I thought these operators were the same?
but I declared

public static bool operator ==(UserList userlist1, UserList userlist2)
{
return (userlist1.Equals(userlist2));
}

as well.
So these operators should be correctly defined.
Or am I wrong?

harold aptroot10-Jul-09 3:37

10-Jul-09 3:37

That should work, although you may be a good idea to test userlist1 for being null before calling Equals on it to avoid a nullref when testing null == userlist2
oh and you'd have to define != as well but the compiler will tell you that

Blue_Boy9-Jul-09 6:53

Blue_Boy

9-Jul-09 6:53

chrisx51 wrote:
testUserList

Does object testUserList exists? Where did you declare it?
Inside your function I can't see any object named testUserList.

I Love T-SQL
"Don't torture yourself,let the life to do it for you."
If my post helps you kindly save my time by voting my post.

chrisx519-Jul-09 23:22

9-Jul-09 23:22

testUserList is being declared in the full programm when a new userlist is being created in another function.
But in the code I need to check a UserList has already been created thus i use if (testUserList != null to check if it really exists.
But my redefined function doesnt like a 'null' as parameter...

DaveyM699-Jul-09 7:37

DaveyM69

9-Jul-09 7:37

From past experience, overloading == and != on a class is generally not a good idea because of the possiblity of it being null.

It works great for structs, but that can bring other problems!

Dave
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chrisx519-Jul-09 23:24

9-Jul-09 23:24

Do you have a better idea to check the equality of an own List<>?
Shall I create a completely new function like ownEqualityCheck(UserList userlist...); ?

DaveyM6910-Jul-09 4:26

DaveyM69

10-Jul-09 4:26

I've just had another look at this. It seems that by converting your class instances to objects, you can do a null check. e.g.

public class Test
{
    private int internalValue;
    public Test(int value)
    {
        internalValue = value;
    }

    public static bool operator ==(Test test1, Test test2)
    {
        object o1 = test1;
        object o2 = test2;
        if (o1 == null || o2 == null)
            return (o1 == null && o2 == null);
        return test1.internalValue == test2.internalValue;
    }
    public static bool operator !=(Test test1, Test test2)
    {
        return !(test1 == test2);
    }
}

chrisx5112-Jul-09 23:32