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my Vc DLL Source is
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#ifndef IZZIXFELAPI32_H
#define IZZIXFELAPI32_H

#ifdef IZZIXFELAPI32_EXPORTS
#define IZZIXFELAPI32_API __declspec(dllexport)
#else
#define IZZIXFELAPI32_API __declspec(dllimport)
#endif

#define MAX_FEATUREVECT_LEN 480
#define HIGH_LEVEL 2
#define MEDIUM_LEVEL 1
#define LOW_LEVEL 0

// Error code of FingerAPI 
#define FPAPIERR_NO 0 
#define FPAPIERR_OK 1
#define FPAPIERR_GENERAL_ERROR -1
#define FPAPIERR_CAN_NOT_OPEN_DEVICE -2

#define FPAPIERR_MATCH_FAILED -101
#define FPAPIERR_CAN_NOT_ALLOC_MEMORY -201
#define FPAPIERR_VECT_FAILED -301 
#define FPAPIERR_INVALID_IMAGESIZE -401
#define FPAPIERR_FAKER_FINGERPRINT -501

#define FPAPIERR_LEFT_FINGERPRINT -601
#define FPAPIERR_RIGHT_FINGERPRINT -602
#define FPAPIERR_UP_FINGERPRINT -603
#define FPAPIERR_DOWN_FINGERPRINT -604
#define FPAPIERR_SMALL_FINGERPRINT -605

#define FPAPIERR_TOO_WET -701
#define FPAPIERR_TOO_DRY -702


typedef struct
{
BYTE Data[MAX_FEATUREVECT_LEN];
} MINUTIAVECT, *LPMINUTIAVECT;


#ifdef __cplusplus
#define EXTWRN_C extern "C"
#else
#define EXTWRN_C
#endif

#ifdef __cplusplus
extern "C" {
#endif


namespace IzzixFELAPI32
{
void __stdcall DESEncode0(UCHAR *src,UCHAR *dec,UCHAR *key,int num);
void __stdcall DESEncode1(UCHAR *src,UCHAR *dec,UCHAR *key);
int __stdcall DESDecode(UCHAR *src,UCHAR *dec,UCHAR *key);
int __stdcall GetFinger(INT DeviceNumber,BYTE* pRawImage,LPMINUTIAVECT pFeature);
int __stdcall MatchFingerOneToOne(LPMINUTIAVECT pFeatureVect1,
LPMINUTIAVECT pFeatureVect2,
int securitylevel
);

int __stdcall MatchFingerOneToN(
LPMINUTIAVECT pFeatureVect,
LPMINUTIAVECT pDataBaseVects,
int nDataBaseSize,
int securitylevel,
int* pDataBaseIDs,
int* pAlwaysNULL
);

int __stdcall CollectFeature(LPMINUTIAVECT pFeatureVect1,
LPMINUTIAVECT pFeatureVect2,
LPMINUTIAVECT pFeatureVect3,
LPMINUTIAVECT pCollectVect
);

int __stdcall DisplayImage(HWND hWnd,int x1,int y1,int x2,int y2,
BYTE* pImage,int nWidth,int nHeight);

int __stdcall IsAvailableDevice(INT DeviceNumber);
int __stdcall GetSortedIndex(LPMINUTIAVECT pFeatureVect,
LPMINUTIAVECT pDataBaseVects,
int nDataBaseSize,
int* pIndex
);

int __stdcall GetFingerAPIVersion(UCHAR *Version);
int __stdcall GetSerial(INT DeviceNumber,UCHAR *Serial);
int __stdcall ConvertToISO(LPMINUTIAVECT pFeature,int fPos,unsigned char* Template);
int __stdcall ConvertFromISO(unsigned char* Template,LPMINUTIAVECT pFeature);
int __stdcall GetTouchStatus(INT DeviceNumber, BOOL &bTouch);
int __stdcall GetDevInfos(INT DeviceNumber, int *nProductType, int *nSensorType);
}

#ifdef __cplusplus
}
#endif
#endif

Function "DisplayImage" and "GetFinger"
The two do not use at all.
I want to know how to use the structure

-> AccessViolationException
-> Attempted to read or write protected memory. This is often an indication that other memory is corrupt.