Calling a Delphi DLL from C# produces unexpected results

Question

I have a Delphi DLL that I did not write, but need to call from a C# ASP.NET 3.5 app. Here is the function definition I got from the developers:

function Cr         


        

Answer 1

I've never done this but try changing your code to:

function CreateCode(SerialID : String;
    StartDateOfYear, YearOfStartDate, YearOfEndDate, DatePeriod : Word;
    CodeType,RecordNumber,StartHour,EndHour : Byte) : PChar; stdcall;
    external 'CreateCodeDLL.dll';

Note the extra stdcall.

Edit2: As you can see from the other replies you either have to do the change above or write a wrapper dll that does the same thing.