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?
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Are you talking about VB.NET or VB6? Your question is tagged with VB6 but it is more likely you mean VB.NET.DAXaholic– DAXaholic2016-07-17 06:45:52 +00:00Commented Jul 17, 2016 at 6:45
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@DAXaholic - corrected!Kanchu– Kanchu2016-07-17 07:59:52 +00:00Commented Jul 17, 2016 at 7:59
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The C# code directly translated to VB.NET should work. If it doesn't, please explain that in the question.Heinzi– Heinzi2016-07-17 08:02:12 +00:00Commented Jul 17, 2016 at 8:02
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@Heinzi - Translation using converter.telerik.com worked! Thank you...Kanchu– Kanchu2016-07-17 08:25:45 +00:00Commented Jul 17, 2016 at 8:25
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@Kanchu: You're welcome! I suggest that you add an answer to your question, so that others with the same problem can profit from your solution.Heinzi– Heinzi2016-07-17 13:19:56 +00:00Commented Jul 17, 2016 at 13:19
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1 Answer
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