Hi there,

I use an old C API DLL with a function, that returns a
structure like this:

struct err_struct
{
short error_type;
long eppix_status;
char message_data[51];
long error_code;
short isam_error;
char error_text[501];
};

Function is defined like this:
struct err_struct _stdcall DummyFunction(long *);

In C# I define structure and Function like this:
[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi)]
public struct ErrorStruct
{
public short error_type;
public int eppix_status;
public string message_data;
public int error_code;
public short isam_error;
public string error_text;
}
[DllImport("Dummy.DLL",
CallingConvention=CallingConvention.StdCall,
CharSet=CharSet.Ansi)]
public static extern ErrorStruct DummyFunction(ref int
SizeOfCache);

I try to call this function from C# and
receive 'System.Runtime.InteropServices.MarshalDirectiveExc
eption with additional text: The method's sinature is not
PInvoke compartible.

How do I have to define this structure and function in C#
to be able to call this API function?

Regards,
Alex