Calling a Delphi DLL from a C# .NET application

Question

EDIT: I\'ve posted a better implementation of this, below. I left this here so the responses would make sense.

I\'ve done numerous searches for the

Answer 1

It is easier to retireve a string using PString:

function DelphiFunction(inputString : PAnsiChar;
                    var outputStringBuffer : PString;
                    var errorMsgBuffer : PString)
                    : WordBool; stdcall; export;
var 
  s : string;
begin
  try
    s := inputString;
    outputStringBuffer:=PString(AnsiString(s));
    Result := true;
  except
    on e : exception do
    begin
      s:= 'error';
      errorMsgBuffer:=PString(AnsiString(e.Message));
      Result := false;
    end;
  end;
end;

In c# then:

    const int stringBufferSize = 1024;

    var  str = new    IntPtr(stringBufferSize);

    string loginResult = Marshal.PtrToStringAnsi(str);