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LoadTypeLibEx signature and use (COM interop)
f#.net interop

Simple question: What would be signature and how can I call this method from F#?

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[ DllImport( "oleaut32.dll", CharSet = CharSet.Unicode, PreserveSig = false )]
private static extern void LoadTypeLibEx( String strTypeLibName, RegKind regKind, 
       [ MarshalAs( UnmanagedType.Interface )] out Object typeLib);

I got this so far: 

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[<DllImport( "oleaut32.dll", CharSet = CharSet.Unicode, PreserveSig = false)>]
extern void LoadTypeLibEx(String strTypeLibName, RegKind regKind, 
       [<MarshalAs(UnmanagedType.Interface)>] [<Out>] Object typeLib)

but it seems that I cannot get the typeLib object back - it either cannot be cast to ITypeLib or it is null.
Thank you for any hint on this.

.

Thanks to Keith Battocchi this signature works:

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[<DllImport("oleaut32.dll", CharSet = CharSet.Unicode, PreserveSig = false )>]
extern [<MarshalAs(UnmanagedType.Interface)>]obj LoadTypeLibEx(string libName, int regKind)
By on 12/9/2011 12:05 PM ()

What's ITypeLib?

By on 12/9/2011 11:40 AM ()

ITypeLib is an interface (System.Runtime.InteropServices.ComTypes.ITypeLib) that shoud be returned in 'out typeLib' parameter

By on 12/9/2011 11:44 AM ()

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