Hi all,

I have a dll that communicate with access control hardware which stores all transactions in its memory
unfortunately, all docs are in c# which I note able to manage since I know vb6 only

the main structure (Type as in vb6) has the following:

Public Structure sysReply

' Fields
<FieldOffset(0)> _
Public nsysNumber As Short
<FieldOffset(4)> _
Public nType As Integer
<MarshalAs(UnmanagedType.ByValArray, SizeConst:=&H400), FieldOffset(8)> _
Public sBuffer As Char()
End Structur

the sbuffer array is the union of all events

what I understand that there is no union in vb6 but is UDT

so there is many UDT's thats is related to the sbuffer according to the nType in the sysReply structure

my question is how to deal with the above in vb6?

I did the following

Public type sysReply

nsysNumber As integer
nType as integer
sBuffer() As Byte
end type

public sReply as sysReply

there is other structures that is related to the nType



and use copymemory to copy the sysRply to every udt
like:

Dim bytcommstatus As sysReplyCommStatus

CopyMemory ByVal VarPtr(bytcommstatus), ByVal VarPtr(sReply), LenB(bytcommstatus)

With bytcommstatus
debug.print .status
debug.print .error_no

end with

I get get data but I face two problems

- data are not in same order as udt
- application crashes

can someone show me example?

regards