CvSeq

CvSeq 에 대해서 알아보자.

C:\Program Files\OpenCV\docs\ref\opencvref_cxcore.htm (설치되어있을 경우에만, 확인바람)

사용되는 함수들

StartReadSeq()

void cvStartReadSeq( const CvSeq* seq, CvSeqReader* reader, int reverse=0 );

seq 
Sequence. 
reader 
Reader state; initialized by the function. 
reverse 
Determines the direction of the sequence traversal. If reverse is 0, the reader is positioned at the first sequence element, otherwise it is positioned at the last element. 
 

CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* seq = cvCreateSeq( CV_32SC1, sizeof(CvSeq), sizeof(int), storage );
CvSeqWriter writer;
CvSeqReader reader;
int i;

cvStartAppendToSeq( seq, &writer );
for( i = 0; i < 10; i++ )
{
    int val = rand()%100;
    CV_WRITE_SEQ_ELEM( val, writer );
    printf("%d is written\n", val );
}
cvEndWriteSeq( &writer );

cvStartReadSeq( seq, &reader, 0 );
for( i = 0; i < seq->total; i++ )
{
    int val;
#if 1
    CV_READ_SEQ_ELEM( val, reader );
    printf("%d is read\n", val );
#else /* alternative way, that is preferable if sequence elements are large,
         or their size/type is unknown at compile time */
    printf("%d is read\n", *(int*)reader.ptr );
    CV_NEXT_SEQ_ELEM( seq->elem_size, reader );
#endif
}
...

cvReleaseStorage( &storage );