VC调用dll问题，请大神帮忙！

本人接触vc6.0时间不长，单独用vc调用dll文件我会，现在有一个原来用delphi调用的dll文件，在
delphi里调用如下：
unit OemLibrary;

interface

type
PTOEMDATA = ^TOEMDATA;
TOEMDATA = array[0..3] of byte;
PByte = ^byte;

// C declaration:
// void OemInit(unsigned char* key);
// bool OemSign(unsigned char* data, unsigned char*& sign);
// void OemCleanup();

{*
*
*}
procedure OemInit; stdcall;

{*
*
*}
function OemSign(data: PByte; var sign: PTOEMDATA): Boolean; stdcall;

{*
*
*}
procedure OemCleanup; stdcall;

implementation

uses SysUtils; // For Exceptions

const DLL_Name = 'OemLibrary.dll';

procedure OemInit; stdcall; external DLL_Name;
function OemSign(data: PByte; var sign: PTOEMDATA): Boolean; stdcall; external DLL_Name;
procedure OemCleanup; stdcall; external DLL_Name;

end.
这个是老外写的，请问用vc调用该dll文件怎么写？请各位高手支招，小弟不胜感激！

http://blog.csdn.net/zhongguoren666/article/details/4615745