FIX: OutOfMemoryException Occurs When You Access Non-Fixed Size Safe Arrays in a User-Defined Type (327107)

SYMPTOMS

The following error message occurs when you invoke a method on a Component Object Model (COM) object that returns a user-defined type that contains a Safe array (non-fixed size):

An unhandled exception of type 'System.OutOfMemoryException' occurred in ApplicationName.exe

Additional information: Not enough storage is available to complete this operation.

MORE INFORMATION

Steps to Reproduce the Behavior

Create an ActiveX DLL project in Microsoft Visual Basic 6.0. Paste the following code in the default class module, Class1 (Class1.cls):

Public Type Test
    l As Long
    x() As Integer
End Type

Public Function Func() As Test
    Dim t As Test
    t.l = 100
    Func = t
End Function

Make Project1.dll.
Open Microsoft Visual Studio. NET and then create a Windows Application project in Visual Basic .NET.
Add a reference to Project1.dll.
Add a Button control to Form1.

Copy and then paste the following code after the Windows Form Designer generated code region:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim c As New Project1.Class1()
        c.Func()
    End Sub

Compile and then run the application. Click the button.

REFERENCES

For more information about interop marshaling, visit the following Microsoft Web site:

Interop Marshaling
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconinteropmarshaling.asp