CODEWITHSUNDEEP
vb.netvisual-c++dll
Debu
Debu

Reputation: 19

Passing array vb.net to vc++ managed DLL

I want to pass a one dimensional array vb.net to vc++ managed DLL,in visual studio 2008.Dll is created.In VB.net, During building time it's give one error.

//ERROR

error BC30657: 'abc' has a return type that is not supported or parameter 
type that are not supported .

//My Dll code // MyCDll.h

#pragma once

using namespace System;
#include "stdafx.h"

namespace MyCDll
{       
    public ref class Class1
    {
            public:
                static int abc(int nu[])
            {
               int i,value=0;

               for (i=1;i<5;i++)
               {    
                  if(nu[i])
                  {
                      value=i+1;

                  }
               }
               //Return the position of the number in the array.
               return value;                   
            }           
    };
}

The vb.net code:

Imports System.IO
Imports System.Runtime.InteropServices
Module Module1
    'Dim result As Integer

    Sub Main()
              Dim nums() As Integer = New Integer() {1, 2, 3, 4, 5, 6}
              'Dim nums() As Integer =  {1, 2, 3, 4, 5, 6}
         Dim obj As New MyCDll.Class1


         Console.WriteLine(obj.abc(ByVal nums() As Integer)As Integer)

        'result = obj.abc(ByVal nums()As Integer)

       Console.ReadLine()
    End Sub

End Module

Upvotes: 1

Views: 385

Answers (2)

Debu
Debu

Reputation: 19

Arrays in managed C++ need to use the managed syntax.

 static int abc(array<int>^ nu)

Upvotes: 1

alwaysVBNET
alwaysVBNET

Reputation: 3310

You are not calling the dll function correctly. The way you have it coded will give you compilation errors. You need to pass the parameter (array of integers) like this:

obj.abc(nums())

This will return a value. Therefore you need to get that value and convert it to string, like below, and then print it:

Console.WriteLine(CStr(obj.abc(nums())))

Try this

        Dim intArray As New List(Of Integer)
        intArray.Add(1)
        intArray.Add(2)
        Dim sResult as string 
       sResult = obj.abc(intArray.ToArray())

Upvotes: 0

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