[Mono-bugs] [Bug 655674] Got exception and program crashes when LayoutKind.Auto is used during P/Invoke

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Wed Dec 1 08:16:07 EST 2010



Zoltan Varga <vargaz at gmail.com> changed:

           What    |Removed                     |Added
                 CC|                            |vargaz at gmail.com

--- Comment #2 from Zoltan Varga <vargaz at gmail.com> 2010-12-01 13:16:06 UTC ---
On net 4.0, I get:

Unhandled Exception: System.ArgumentException: The specified structure must be
blittable or have layout information.
Parameter name: structure
   at System.Runtime.InteropServices.Marshal.StructureToPtr(Object structure,
IntPtr ptr, Boolean fDeleteOld)
   at Program.Main(String[] args)

for this testcase:
using System;
using System.Runtime.InteropServices;

    [StructLayout (LayoutKind.Auto)]
    public class SimpleClass {

class Program
    static void Main (string[] args)
        SimpleClass c = new SimpleClass ();
        IntPtr p = Marshal.AllocHGlobal (1024);
        Marshal.StructureToPtr (c, p, false);

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