Delphi调用C++动态库问题，导出函数的参数为结构体。(50分)

#ifdef DYNAMICDLL_EXPORTS
 #define DLL_API _declspec(dllexport)
#else
 #define DLL_API _declspec(dllimport)
#endif

#include <iostream>
#include <string>
struct STXCP
{
 int ndevid;
 std::string strdevName;
};

extern "C"
{
 DLL_API void Test(STXCP &ostxcp);
}

#include "CTest.h"

void Test(STXCP &ostxcp)
{
 ostxcp.ndevid = 10;
 ostxcp.strdevName = "ma5600v3";
}

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type

  //-----------------------
  TXCP = record
    ndevid: integer;
    strdevName: string;
  end;

  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);

  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;


implementation
procedure Test(var oxcp :TXCP);cdecl;external'E:/Delphi/C_Dll/dll/DynamicDLL.dll' name 'Test';
{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  oTest : TXCP;
begin
Test(oTest);
showmessage(oTest.strdevName); //运行到这出错
end;

end.