Re: Selectively disallowing PInvoke

From: Geoff Schwab [MSFT] (a-geosch_at_online.microsoft.com)
Date: 11/17/03 

Date: Mon, 17 Nov 2003 11:24:51 -0800

Hi Nandakumar,

I assume you want this control from the managed side of the code. Can you
get enough control by using namespaces combined with internal? I do
something similar in a graphics engine by doing the following...

namespace GXGraphicsLibrary
{
    // This is only available internal to GXGraphicsLibrary
    internal class GAPI
    {
        [DllImport("gx.dll", EntryPoint="#1")]
        extern public static IntPtr GxBeginDraw();
    }

    // This is visible to anyone accessing GXGraphicsLibrary
    public class Windows
    {
        [DllImport("coredll.dll")]
        extern public static IntPtr GetCapture();
    }
}

You should also be able to control each P/Invoke individually using internal
where I have the declarations as public, though I have not tried this...

namespace GXGraphicsLibrary
{
    public class Imports
    {
        // This is only available internal to GXGraphicsLibrary
        [DllImport("gx.dll", EntryPoint="#1")]
        extern internal static IntPtr GxBeginDraw();

        // This is visible to anyone accessing GXGraphicsLibrary
        [DllImport("coredll.dll")]
        extern public static IntPtr GetCapture();
    }
} 

-- 
Geoff Schwab
Program Manager
Excell Data Corporation
http://msdn.com/mobility
http://msdn.microsoft.com/mobility/prodtechinfo/devtools/netcf/FAQ/default.aspx
This posting is provided "AS IS" with no warranties, and confers no rights.
"Nandakumar Sankaran" <Nandakumar@bsquare.com> wrote in message
news:uA0k5WwqDHA.2244@TK2MSFTNGP12.phx.gbl...
> Hi, I'm wondering if there is a way in a Windows CE.Net environment to
> selectively permit managed applications to call into native DLLs (through
> PInvoke). In other words, I want to allow certain applications to be able
to
> call into native DLLs and disallow other apps from doing the same.
>
> Thanks for any suggestions.
> Nandakumar
>
>

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