求教，99分

Question

我在一个类里写个两个方法a()和b()，其中a()要调用b()的返回值，我就在a()中调用了b()，但是报错，不可以这样调？谢谢

Answer 1

long Verify(
    SensorHandle_t hSensor,
    long Mode, long Row, long Col,
    PENROLLINFO pEnrolledData )
{
    unsigned char *pImageData;
    ENROLLINFO VerifyData;
    long dFlag, compressFlag;
    BOOL Done = FALSE;
    long lReturnValue = -1;    char Message[128];#ifdef EMBEDDED_SYSTEM
    pImageData = ImageDataBuffer;
#else
    pImageData = (unsigned char *) calloc( Row*Col, sizeof( unsigned char) );
    if ( pImageData == NULL )
    {
        sprintf( Message, "\nERROR in Verify(): Fail to allocate system memory.\n" );
        //OutputMessage( Message );
        return lReturnValue;
    }
#endif    /* Suggested security level for verification is V_MATCH_MEDIUM_SEC.
       Depending on application, refer to SDK manual for all the
       available security levels.
    */
    setMatcherSecurity( V_MATCH_MEDIUM_SEC );    dFlag = 0;
    compressFlag = FP_COMPRESS_FLAG;    /* This loop is continuous until a matched fingerprint is input,
       or timeout happened.
       If timeout happens, it means user don't want to verify.
       Note that timeout period is adjustable in CaptureFingerprint().
    */
    while ( !Done )
    {
        if ( CaptureFingerprint( hSensor, Mode, Row, Col, VERIFICATION, pImageData ) )
        {
            /* Extract minutiae (information) from the fingerprint */
            VerifyData.lMinuQuality = 
            fpProcess( pImageData, Row, Col, 
                       (void *)VerifyData.Minutiae,
                       &VerifyData.nMinutiae,
                       NULL, dFlag, compressFlag );            /* Cannot get minutiae from the fingerprint, try again. */
            if ( VerifyData.lMinuQuality < MIN_VERIFY_MINU_QUALITY ||
                 VerifyData.nMinutiae < MIN_VERIFY_MINU_NUMBER )
            {
                sprintf( Message, "\nFail to extract reasonable minutiae. Do capture again." );
                //OutputMessage( Message );
                continue;
            }            if ( matchprints( VerifyData.Minutiae, VerifyData.nMinutiae,
                              pEnrolledData->Minutiae,
                              pEnrolledData->nMinutiae ) >= MIN_VERIFY_MATCHES )
            {
                /* Need to have at least 1 match.
                   Programmer can adjust this value for according to
                   the level of security.
                */
                sprintf( Message, "\n\n!!! A matched finger is detected !!!" );
                //OutputMessage( Message );
                lReturnValue = VFPS_STATUS_SUCCESS;
                break;
            }
            else
            {
                sprintf( Message, "\n*** Not a matched finger ***" );
                //OutputMessage( Message );
                continue;
            }        }
        else
        {
            sprintf( Message, "\nTimeout: Verification abort." );
            //utputMessage( Message );
            break;
        }    }   /* End while ( !Done ) */    /* free resources */
#ifndef EMBEDDED_SYSTEM
    free( pImageData );
#endif    return lReturnValue;}   /* End of Verify */

Answer 2

报错说CaptureFingerprint()-------------undeclared identifier,可我已经定义过CaptureFingerprint().

Answer 3

已经解决，我在verify前面加了  类名::,唉，白忙了这么久

Answer 4

BOOL Print::CaptureFingerprint( 
    SensorHandle_t hSensor,
    long Mode, long Row, long Col,
    CAPTURE_PURPOSE Purpose,
    unsigned char *pImageData )
{
    unsigned long SleepTime;
    long TotalAttempts, QualityAttempts, Flags;
    long lResult, Quality;
    BOOL Done, bResult;    
    SleepTime = 300;    /* 500 mSec */    
    TotalAttempts = 60;   
    
    QualityAttempts = 3;    
    Flags = VFPS_IMAGEPLUS | VFPS_AS_CONTINUOUS;    
    bResult = FALSE;
    Done = FALSE;
    while ( !Done )
    {
        
        lResult = VFPSautosnap( hSensor, pImageData, SleepTime, TotalAttempts,
                                QualityAttempts, &Quality, Flags );        
                switch ( lResult )
        {
                        case VFPS_AS_TIMEOUT:
                Done = TRUE;
                break;                        case VFPS_IMG_LATENT:
                break;            case VFPS_IMG_SUPPRESSED:
                //OutputMessage( "\nPlease lift finger from sensor and put back again." );
                break;                        case VFPS_AS_ACCEPTABLE_QUAL:
                Done = TRUE;
                bResult = TRUE;
                break;            
            case VFPS_AS_POOR_QUAL:
                                if ( Purpose == VERIFICATION )
                {
                    Done = TRUE;
                    bResult = TRUE;
                    break;
                }               
            case VFPS_AS_UNACCEPTABLE_QUAL:
            default:
                
                PromptIfBadQuality( Quality );
                break;        }       }   
    return bResult;}