Hi Petevick,
I successfully P/Invoke IcmpSendEcho2 and it's working almost perfect. But there are still two things that annoyed me. Here is the IcmpSendEcho2 DllImport:
<DllImport("iphlpapi.dll", SetLastError:=True)> _
Private Shared Function IcmpSendEcho2(ByVal icmpHandle As IntPtr, _
ByVal hEvent As Int32, _
ByVal ApcRoutine As Int32, _
ByVal ApcContext As Int32, _
ByVal destinationAddress As Int32, _
ByVal requestData As String, _
ByVal requestSize As Int32, _
ByRef requestOptions As ICMP_OPTIONS, _
ByRef replyBuffer As ICMP_ECHO_REPLY, _
ByVal replySize As Int32, _
ByVal timeout As Int32) As Int32
1. When the destination host is unknown or its offline, there is still too long time out using IcmpSendEcho2. Is there a way to solve it, using hEvent.. according to this (http://msdn.microsoft.com/en-us/library/ms927418.aspx):
This function sends an ICMP echo request and the call returns either immediately,
if the Event parameter is non-NULL
In my case, I use it as Int32 which is null :confused: because I don't really know how to implement it as EventHandler
2. The time for DNS is too long if it's not in my network (it's just hang for 5-6seconds). I use this to resolve the IP address, before I start pinging:
Try
ipEntry = Net.Dns.GetHostEntry(DestinationHost.Text)
destinationIP = ipEntry.AddressList(0)
Catch ex As Exception
End Try
Can you please give me a hand in this with suggestion, or just point me in the right direction?
Thank you!