Re: C# calling Delphi-function

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#380

From: Marc Rohloff TeamB
Date: Thu, 21 Apr 2005 11:14

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On Thu, 21 Apr 2005 12:19:53 +0300, ttt wrote:

> I have a problem. Could somebody help me?
> I have C# program that calls a function written with Delphi.
> Why won't this structure work?
> 
> public struct UserInfo
>  {
>      public char[] FirstName;
>      public char[] LastName;
> }

What does your P/Invoke declaration look like?

In .NET arrays are reference types (pointers) and not stored in line
as they are in Delphi. You have to add some attributes to get the
runtime to Marshal them the way you need.


Commonly something like:
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct UserInfo
{
     [MarshalAs(UnmanagedType.ByValArray, SizeConst=80)]
     public char[] FirstName;
     [MarshalAs(UnmanagedType.ByValArray, SizeConst=80)]
     public char[] LastName;
}


-- 
Marc Rohloff [TeamB]
marc rohloff -at- myrealbox -dot- com

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