Test if host is online

[Marc-André]

I would like to find a simple way to test if a computer is online.

I found a lot of code on internet about using existing ping class...but the
code was not looking really good. There must be a simple way to do that?

Thanks!

[Ignacio Machin \( .NET/ C# MVP \)]

hi,

if you want to know if a host is accesible a ping MAY be helpful, it may
also be filtered out so you cannot really trust on it.

You could also try to connect to a known service that host provide, in this
case you have the drawback that the service may be down but the host still
up :)
It depends of your intentions about what is the best solution.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation


"Marc-André" <Marc-André@discussio ns.microsoft.co m> wrote in message
news:5B******** *************** ***********@mic rosoft.com...

I would like to find a simple way to test if a computer is online.

I found a lot of code on internet about using existing ping class...but
the
code was not looking really good. There must be a simple way to do that?

Thanks!

[Marc-André]

Well, I would like to go with a ping...but I have notice that c# doesn't
containt a easy way to do a ping. I have try to use a existing ping
application (http://www.dataidee.com/ping/ping.htm)

The problem is that you got to be a admin on the computer to use
"SocketType.Raw "

I can't belive theres nothing simple that let you know if a computer is
online...

"Ignacio Machin ( .NET/ C# MVP )" wrote:

hi,

if you want to know if a host is accesible a ping MAY be helpful, it may
also be filtered out so you cannot really trust on it.

You could also try to connect to a known service that host provide, in this
case you have the drawback that the service may be down but the host still
up :)
It depends of your intentions about what is the best solution.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation


"Marc-André" <Marc-André@discussi ons.microsoft.c om> wrote in message
news:5B******** *************** ***********@mic rosoft.com...

I would like to find a simple way to test if a computer is online.

I found a lot of code on internet about using existing ping class...but
the
code was not looking really good. There must be a simple way to do that?

Thanks!

[Marc-André]

Well, finally I have found something....

http://spaces.msn.com/members/dotnot...mt&_c=blogpart

private bool isMachineReacha ble(string hostName)

{

System.Net.IPHo stEntry host = System.Net.Dns. GetHostByName(h ostName);

string wqlTemplate = "SELECT StatusCode FROM Win32_PingStatu s WHERE Address
= '{0}'";

System.Manageme nt.ManagementOb jectSearcher query = new
ManagementObjec tSearcher();

query.Query = new ObjectQuery(Str ing.Format(wqlT emplate,
host.AddressLis t[0]));

query.Scope = new ManagementScope ("//localhost/root/cimv2");

ManagementObjec tCollection pings = query.Get();

foreach(Managem entObject ping in pings)
{

if( Convert.ToInt32 (ping.GetProper tyValue("Status Code")) == 0)
return true;
}

return false;
}

If I have a problem with it....I will give youi my feedback on it...

"Marc-André" wrote:

I would like to find a simple way to test if a computer is online.

I found a lot of code on internet about using existing ping class...but the
code was not looking really good. There must be a simple way to do that?

Thanks!

[Willy Denoyette [MVP]]

No need to get the IP address from the hostname using GetHostByName, the
address property takes a host name or an address.

SELECT StatusCode FROM Win32_PingStatu s WHERE Address='MyHost name'
Willy.

"Marc-André" <Ma******@discu ssions.microsof t.com> wrote in message
news:1E******** *************** ***********@mic rosoft.com...

Well, finally I have found something....

http://spaces.msn.com/members/dotnot...mt&_c=blogpart

private bool isMachineReacha ble(string hostName)

{

System.Net.IPHo stEntry host = System.Net.Dns. GetHostByName(h ostName);

string wqlTemplate = "SELECT StatusCode FROM Win32_PingStatu s WHERE
Address
= '{0}'";

System.Manageme nt.ManagementOb jectSearcher query = new
ManagementObjec tSearcher();

query.Query = new ObjectQuery(Str ing.Format(wqlT emplate,
host.AddressLis t[0]));

query.Scope = new ManagementScope ("//localhost/root/cimv2");

ManagementObjec tCollection pings = query.Get();

foreach(Managem entObject ping in pings)
{

if( Convert.ToInt32 (ping.GetProper tyValue("Status Code")) == 0)
return true;
}

return false;
}

If I have a problem with it....I will give youi my feedback on it...

"Marc-André" wrote:

I would like to find a simple way to test if a computer is online.

I found a lot of code on internet about using existing ping class...but
the
code was not looking really good. There must be a simple way to do that?

Thanks!