Calling C# from VB.Net with arguments by reference

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hi

Hi

I am trying to call a C# function where I pass an argument by argument by
reference.

Here is the C#
using System;

namespace TheCSharpBit
{
/// <summary>
/// Summary description for Class1.
/// </summary>
public class Class1
{
unsafe public string CSharpFunction(int *myArg)
{
int i;
string s;

i = *myArg;

s = i.ToString() ;

*myArg=5;

return "From CSharpFunction " + s;
}

}
}

Here is a VB code snippet.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim obj As New TheCSharpBit.Class1
Dim i As Integer

i = 3

Label1.Text = obj.CSharpFunction(i)

Console.WriteLine(i)

obj = Nothing
End Sub

Whan I complie I get the following error:
'CSharpFunction' has a return type that is not supported or parameter types
that are not supported.

I know the problem is with the parameter, so how do I pass the address of I
to the C# function CsharpFunction.

Thanks for your help

Chris
 
I know the problem is with the parameter, so how do I pass the address of I
to the C# function CsharpFunction.
Click to expand...

Unless you have a good reason for using pointers, change the C# method
signature to


public string CSharpFunction(ref int myArg)




Mattias
 
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