Test if host is online

[Guest]

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,

 

[Guest]

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...

 

[Guest]

Well, finally I have found something....

http://spaces.msn.com/members/dotnoted/PersonalSpace.aspx?_c01_blogpart=blogmgmt&_c=blogpart

private bool isMachineReachable(string hostName)

{

System.Net.IPHostEntry host = System.Net.Dns.GetHostByName(hostName);

string wqlTemplate = "SELECT StatusCode FROM Win32_PingStatus WHERE Address
= '{0}'";

System.Management.ManagementObjectSearcher query = new
ManagementObjectSearcher();

query.Query = new ObjectQuery(String.Format(wqlTemplate,
host.AddressList[0]));

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

ManagementObjectCollection pings = query.Get();

foreach(ManagementObject ping in pings)
{

if( Convert.ToInt32(ping.GetPropertyValue("StatusCode")) == 0)
return true;
}

return false;
}

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

 

[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_PingStatus WHERE Address='MyHostname'


Willy.

Well, finally I have found something....

http://spaces.msn.com/members/dotnoted/PersonalSpace.aspx?_c01_blogpart=blogmgmt&_c=blogpart

private bool isMachineReachable(string hostName)

{

System.Net.IPHostEntry host = System.Net.Dns.GetHostByName(hostName);

string wqlTemplate = "SELECT StatusCode FROM Win32_PingStatus WHERE
Address
= '{0}'";

System.Management.ManagementObjectSearcher query = new
ManagementObjectSearcher();

query.Query = new ObjectQuery(String.Format(wqlTemplate,
host.AddressList[0]));

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

ManagementObjectCollection pings = query.Get();

foreach(ManagementObject ping in pings)
{

if( Convert.ToInt32(ping.GetPropertyValue("StatusCode")) == 0)
return true;
}

return false;
}

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

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!