GetIfTable API function

[Greg1997]

Hi All,

I'm trying to convert VB6 code using IPHelper APIs into VB.NET(VS 2005).
The problem I have: GetIfTable function returns error code 87 - "Invalid parameter" when I call it second time.

Any ideas on usage of GetIfTable in VB.NET?

Thanks,
Greg

 

[jmcilhinney]

Perhaps you'd like to show how you're using it and what its declaration looks like?

 

[Greg1997]

GetIfTable declaration

jmcilhinney,

Thanks for reply.
The problem was in GetIfTable function declaration:
First parameter should be passed ByVal, not ByRef.

Thanks,
Greg

 

[JohnH]

Well, if it works for you it works for you, but the definition for GetIfTable first parameter is ByRef. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/getiftable.asp (C++ can limit by reference in/out/ref)
VB.Net:

Declare Function GetIfTable Lib "IPHLPAPI.dll" (ByRef pIfTable As PMIB_IFTABLE, ByRef pdwSize As Int32, ByVal border As Int32) As Int32