MarshalDirectiveException - Method's type signature is not PInvoke compatible

[AGorodnov]

Hello,
I'm trying to retrieve a structure in C# from a C dll. Really to say I'm not an expert programmer on both C/C#, and will appreciate any comments and suggestions.
Here's a C dll coded structure, to be retrieved..
--

struct MESSAGEE 
{
      int               MsgNo;          
      int               MsgType;       
      char        MsgTypeText[64];
      char        MsgNoText[64];  
      char        MsgText[256];    
};

--
the function to be connected to (C coded)
--

MESSAGEE*  Msg_Listing(
            int         &nMsg,    
            int         Type        
)

--
My code in C# for the structure:
--

 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
        public struct MESSAGEE 
        {
            Int32 MsgNo;
            Int32 MsgType;
            [MarshalAs(UnmanagedType.LPStr, SizeConst = 64)]
            string MsgTypeText;
            [MarshalAs(UnmanagedType.LPStr, SizeConst = 64)]
            string MsgNoText;
            [MarshalAs(UnmanagedType.LPStr, SizeConst = 256)]
            string MsgText;
        }

--
And a DLL function calling :
--

        [DllImport("messagees.dll")] // Connection string
        [return: MarshalAs(UnmanagedType.LPStruct)]
        public static unsafe extern MESSAGEE Msg_Listing([Out]
            Int32 nRules,    // # of defined rules
            Int32 Type    // type of rule checking
            );

--

Thanks a lot in advance!!

[KYAW KYAW OO]

Hi,

I am also started facing this issue and please advise me if you manage to settle it.

I am looking forward to hearing from you soon.


Thanks in advance