Return C array to VB.NET

Question

I have a general purpose C DLL, with functions to return pointer to a double array.

I have been able to use it in Perl and C# (Return C++ array to C#) as per my requirement.

How do I use the array (double) being returned by the DLL in VB.NET?

Are you talking about VB.NET or VB6? Your question is tagged with VB6 but it is more likely you mean VB.NET. — DAXaholic, Jul 17 '16 at 06:45
The C# code directly translated to VB.NET should work. If it doesn't, please explain that in the question. — Heinzi, Jul 17 '16 at 08:02
@Heinzi - Translation using http://converter.telerik.com/ worked! Thank you... — Kanchu, Jul 17 '16 at 08:25
@Kanchu: You're welcome! I suggest that you [add an answer to your question](http://stackoverflow.com/help/self-answer), so that others with the same problem can profit from your solution. — Heinzi, Jul 17 '16 at 13:19

Kanchu · Answer 1 · 2016-07-18T16:37:19.380

As suggested by @Heinzi:

Imports System.Runtime.InteropServices

Declare Function functionReturnsArrayPointer Lib "cLibrary.dll" _
        (ByVal argument1 As Double, ByVal argument2 As Integer) As IntPtr

Sub Main()
    Dim arrayWithResult As Double() = New Double(2) {}
    Dim pointerToArray As IntPtr = functionReturnsArrayPointer(12.345, 6)

    Marshal.Copy(pointerToArray, arrayWithResult, 0, 2)
    ' Can also be done as:
    ' Marshal.Copy(functionReturnsArrayPointer(12.345, 6), arrayWithResult, 0, 2)

    ' Do whatever with array
End Sub

Return C array to VB.NET

1 Answers1