Thanks for the help Anssi :D. I think I'm going to have to learn C++.
Cheers Chuckie Ice
From: "Anssi Kolehmainen" <[EMAIL PROTECTED]>
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Subject: RE: [WinPcap-users] Capturing/Sending Packets In Visual Basic
Date: Sun, 2 May 2004 13:42:30 +0300
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> Hey, I found out about your projects and WinPCap a little > while ago. So far, > I can see all of you have put forth a lot of effort into > making this. I had > a few questions though, since I'm not really a proficient C++ > User. I do > have C++, and all the example files work, but I wanted to > know if it was > possible to use WPCap.dll or Packet.dll in Visual Basic using > API calls. I > have tried to convert some of the C++ API to VB, but it just > doesn't seem to > work. Here is an example: > > Private Declare Function PacketGetAdapterNames Lib > "packet.dll" (pStr As > String, BufferSize As Long) As Boolean > > I thought this would be a correct API call, but it seems to > have errors when > I call it. If anyone could help me on this issue, I would > greatly appriciate > it. Thanks!
C function BOOLEAN PacketGetAdapterNames (PTSTR pStr, PULONG BufferSize)
Would translate to Private Declare Function PacketGetAdapterNames lib "packet.dll" (byval pStr as String, byref BufferSize as long) as long
One big thing with VB is that it _doesn't_ support multi-threading. Multi threading happens if you use callback functions (like pcap_loop).
Translating functions from C to VB is easy when you remember few simple things: - ByVal = direct value - ByRef = pointer to value (usually P or LP in front of C type) - With strings byval = pointer to string, byref = pointer to pointer to string - PTSTR = pointer to string = byval string - PULONG = pointer to long = byref long - BOOLEAN = long - Nearly everything are longs - C int = VB long - C short = VB integer
Following might work.
Public Type PACKET hEvent as long Overlapped as long Buffer as byte*1048576 Length as long BytesReceived as long bIoComplete as long End Type
Private Declare Function PacketReceivePacket lib "packet.dll" (byref Adapter
as ADAPTER, byref Packet as PACKET, sync as long) as long
But it might not work because you "need" to use PakcetAllocatePacket & PacketInitPacket... Maybe 'Dim lppacket as long' might work...
In short: It can be done but it is a real pain because VB doesn't have pointers. (Like C/C++ has)
Anssi Kolehmainen
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