using c++ 6.0 DLL in VB.Net program, passing user defined Type

[nickolais909]

Hello,
I have an old C++ DLL that I am wishing to use in a VB.NET program.
Previously I had a VB6 program that would pass a Type to a DLL
function. For example, I would pass a variable of this Type in:

Public Type ListInfo ' structure to hold information about the list
file
FileIndex As Integer
filename(MAXNAME) As Byte
FileNum As Integer
FileIcon As Integer
End Type

I am writing a new VB.NET program that will use the same DLL that was
used by the VB6 program, but I have had to update the data type to be a
structure:

Public Structure ListInfo ' structure to hold information about
the list file
Dim FileIndex As Short
Dim filename() As Byte
Dim FileNum As Short
Dim FileIcon As Short
End Structure
'integers made Shorts b/c of Int size change

My DLL does not like the new data type. Does anyone know of a solution?

 

[Herfried K. Wagner [MVP]]

I have an old C++ DLL that I am wishing to use in a VB.NET program.
Previously I had a VB6 program that would pass a Type to a DLL
function. For example, I would pass a variable of this Type in:

Public Type ListInfo ' structure to hold information about the list
file
FileIndex As Integer
filename(MAXNAME) As Byte
FileNum As Integer
FileIcon As Integer
End Type

I am writing a new VB.NET program that will use the same DLL that was
used by the VB6 program, but I have had to update the data type to be a
structure:

Public Structure ListInfo ' structure to hold information about
the list file
Dim FileIndex As Short
Dim filename() As Byte
Dim FileNum As Short
Dim FileIcon As Short
End Structure
'integers made Shorts b/c of Int size change

My DLL does not like the new data type. Does anyone know of a solution?

\\\
Imports System.Runtime.InteropServices

Public Structure ListInfo
Public FileIndex As Short
<MarshalAs(UnmanagedType.ByValArray, SizeConst:=MAXNAME)> _
Public filename() As Byte
Public FileNum As Short
Public FileIcon As Short
End Structure
///