Passing a structur to a DLL ???

Hi :) I'm trying to work with UNRAR.DLL but i have problem
to passing structur to a dll function, anybody can help me ?
because i become crazy with bmax incomplete doc ....

Here is the UNRAR SDK :
http://www.blitz3dfr.com/tempo/UnRARDLL.rar

Here is my test :

Incbin "unrar.dll"

Const DllName:String = "unrar.dll"
Local DllHandle = LoadLibraryA(DllName)

If DLLhandle = 0 Then
	Notify "Unable to initialize unrar.dll"
	End
EndIf

Const ERAR_END_ARCHIVE = 10
Const ERAR_NO_MEMORY = 11
Const ERAR_BAD_DATA = 12
Const ERAR_BAD_ARCHIVE = 13 
Const ERAR_UNKNOWN_FORMAT = 14
Const ERAR_EOPEN = 15 
Const ERAR_ECREATE = 16
Const ERAR_ECLOSE = 17 
Const ERAR_EREAD = 18 
Const ERAR_EWRITE = 19 
Const ERAR_SMALL_BUF = 20
Const RAR_OM_LIST = 0 
Const RAR_OM_EXTRACT = 1 
Const RAR_SKIP = 0
Const RAR_TEST = 1 
Const RAR_EXTRACT = 2 
Const RAR_VOL_ASK = 0
Const RAR_VOL_NOTIFY = 1

Global RARGetDllVersion()"Win32" = GetProcAddress(DllHandle,"RARGetDllVersion")
Global RAROpenArchive(Structur:Int Ptr)"Win32" = GetProcAddress(DllHandle,"RAROpenArchiveData")


Type RARHeaderData
	Field RAR_ArcName:String
	Field RAR_FileName:String
	Field RAR_flags:Long
	Field RAR_PackSize:Long
	Field RAR_UnpSize:Long
	Field RAR_HostOS:Long
	Field RAR_FileCRC:Long
	Field RAR_FileTime:Long
	Field RAR_UnpVer:Long
	Field RAR_Method:Long
	Field RAR_FileAttr:Long
	Field RAR_CmtBuf:String
	Field RAR_CmtBufSize:Long
	Field RAR_CmtSize:Long
	Field RAR_CmtState:Long
End Type

Type RAROpenArchiveData
	Field RAR_ArcName:String
	Field RAR_OpenMode:Long
	Field RAR_OpenResult:Long
	Field RAR_CmtBuf[0]
	Field RAR_CmtBufSize:Long
	Field RAR_CmtSize:Long
	Field RAR_CmtState:Long
End Type


Global A:RAROpenArchiveData=New RAROpenArchiveData
A.RAR_ArcName="unrar.rar"
A.RAR_OpenMode=RAR_OM_LIST
A.RAR_CmtBufSize=16384



Print "Version : "+RARGetDllVersion()

RAROpenArchive(Int Ptr(Byte Ptr(A)))

The UNRAR.H say that :

#ifndef _UNRAR_DLL_
#define _UNRAR_DLL_

#define ERAR_END_ARCHIVE     10
#define ERAR_NO_MEMORY       11
#define ERAR_BAD_DATA        12
#define ERAR_BAD_ARCHIVE     13
#define ERAR_UNKNOWN_FORMAT  14
#define ERAR_EOPEN           15
#define ERAR_ECREATE         16
#define ERAR_ECLOSE          17
#define ERAR_EREAD           18
#define ERAR_EWRITE          19
#define ERAR_SMALL_BUF       20
#define ERAR_UNKNOWN         21

#define RAR_OM_LIST           0
#define RAR_OM_EXTRACT        1

#define RAR_SKIP              0
#define RAR_TEST              1
#define RAR_EXTRACT           2

#define RAR_VOL_ASK           0
#define RAR_VOL_NOTIFY        1

#define RAR_DLL_VERSION       4

struct RARHeaderData
{
  char         ArcName[260];
  char         FileName[260];
  unsigned int Flags;
  unsigned int PackSize;
  unsigned int UnpSize;
  unsigned int HostOS;
  unsigned int FileCRC;
  unsigned int FileTime;
  unsigned int UnpVer;
  unsigned int Method;
  unsigned int FileAttr;
  char         *CmtBuf;
  unsigned int CmtBufSize;
  unsigned int CmtSize;
  unsigned int CmtState;
};


struct RARHeaderDataEx
{
  char         ArcName[1024];
  wchar_t      ArcNameW[1024];
  char         FileName[1024];
  wchar_t      FileNameW[1024];
  unsigned int Flags;
  unsigned int PackSize;
  unsigned int PackSizeHigh;
  unsigned int UnpSize;
  unsigned int UnpSizeHigh;
  unsigned int HostOS;

  unsigned int FileCRC;
  unsigned int FileTime;
  unsigned int UnpVer;
  unsigned int Method;
  unsigned int FileAttr;
  char         *CmtBuf;
  unsigned int CmtBufSize;
  unsigned int CmtSize;
  unsigned int CmtState;
  unsigned int Reserved[1024];
};


struct RAROpenArchiveData
{
  char         *ArcName;
  unsigned int OpenMode;
  unsigned int OpenResult;
  char         *CmtBuf;
  unsigned int CmtBufSize;
  unsigned int CmtSize;
  unsigned int CmtState;
};

struct RAROpenArchiveDataEx
{
  char         *ArcName;
  wchar_t      *ArcNameW;
  unsigned int OpenMode;
  unsigned int OpenResult;
  char         *CmtBuf;
  unsigned int CmtBufSize;
  unsigned int CmtSize;
  unsigned int CmtState;
  unsigned int Flags;
  unsigned int Reserved[32];
};

enum UNRARCALLBACK_MESSAGES {
  UCM_CHANGEVOLUME,UCM_PROCESSDATA,UCM_NEEDPASSWORD
};

typedef int (CALLBACK *UNRARCALLBACK)(UINT msg,LONG UserData,LONG P1,LONG P2);

typedef int (PASCAL *CHANGEVOLPROC)(char *ArcName,int Mode);
typedef int (PASCAL *PROCESSDATAPROC)(unsigned char *Addr,int Size);

#ifdef __cplusplus
extern "C" {
#endif

HANDLE PASCAL RAROpenArchive(struct RAROpenArchiveData *ArchiveData);
HANDLE PASCAL RAROpenArchiveEx(struct RAROpenArchiveDataEx *ArchiveData);
int    PASCAL RARCloseArchive(HANDLE hArcData);
int    PASCAL RARReadHeader(HANDLE hArcData,struct RARHeaderData *HeaderData);
int    PASCAL RARReadHeaderEx(HANDLE hArcData,struct RARHeaderDataEx *HeaderData);
int    PASCAL RARProcessFile(HANDLE hArcData,int Operation,char *DestPath,char *DestName);
int    PASCAL RARProcessFileW(HANDLE hArcData,int Operation,wchar_t *DestPath,wchar_t *DestName);
void   PASCAL RARSetCallback(HANDLE hArcData,UNRARCALLBACK Callback,LONG UserData);
void   PASCAL RARSetChangeVolProc(HANDLE hArcData,CHANGEVOLPROC ChangeVolProc);
void   PASCAL RARSetProcessDataProc(HANDLE hArcData,PROCESSDATAPROC ProcessDataProc);
void   PASCAL RARSetPassword(HANDLE hArcData,char *Password);
int    PASCAL RARGetDllVersion();

#ifdef __cplusplus
}
#endif

#endif