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use delphi dll in c#

3 replies on 1 page. Most recent reply: Apr 5, 2010 11:45 AM by Alex Kazanskiy

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Erdos Andras

Posts: 1
Nickname: easoft
Registered: May, 2004

use delphi dll in c#

Posted: May 20, 2004 5:58 AM

Hi

I want use dll (Delphi 7) in c#

example

delphi

procedure GetNev(s:PChar);export;
begin
ShowMessage(s) ;
end;
exports GetNev;

c#

[DllImport( "project1.dll", CallingConvention = CallingConvention.StdCall, CharSet=CharSet.Unicode )]
public static extern void GetNev(string s);

GetNev("hello");

problem:
Message is: */-/_:? (not "Hello")

what is tha problem???

Thanks Erdosa

erdos.andras@eduweb.hu

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: use delphi dll in c#

Posted: Jun 4, 2004 8:13 AM

It might be that the string is double byte in C# and single in Delphi.

Another way to call Delphi code from C# is to use COM Automation. In that case you'll be using BSTRs which should also help to alleviate the double/single byte confusion.

Joe Cheng

Posts: 65
Nickname: jcheng
Registered: Oct, 2002

Re: use delphi dll in c#

Posted: Jun 8, 2004 9:05 AM

If Matt's correct about the double/single byte conversion, I think you can fix it by just changing CharSet.Unicode to CharSet.Ansi.

Alex Kazanskiy

Posts: 1
Nickname: kazanskiy
Registered: Apr, 2010

Re: use delphi dll in c#

Posted: Apr 5, 2010 11:45 AM

Delphi declaration should be

procedure GetNev(s:PChar);export; stdcall;

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