c++ opencv 动态内存

1.CvMemStorage定义动态内存存储器
  内存存储器是一个用来存储诸如序列、轮廓、图形和子划分等动态增长数据结构的底层结构


2.示例
CvMemStorage *mems = cvCreateMemStorage(100);
CvMemStoragePos mempos;
cvSaveMemStoragePos(mems, &mempos);//保存地址
//cvRestoreMemStoragePos(mems, &mempos);
printf("%x %d\n", mempos.top, mempos.free_space);


CvMemStorage *mems1 = cvCreateChildMemStorage(mems);//创建子块
CvMemStoragePos mempos1;
cvSaveMemStoragePos(mems1, &mempos1);
printf("%x %d\n", mempos1.top, mempos1.free_space);


char strInfo[] = {"123123123"};
CvString str = cvMemStorageAllocString(mems, strInfo, strlen(strInfo));
printf("%s  %d\n", str.ptr, str.len);
cvReleaseMemStorage((CvMemStorage**)&mems);


3.CvSeq是所有OpenCV动态数据结构的基础。序列有两种类型：稠密序列和稀疏序列。
  (1).稠密序列都派生于CvSeq，用来代表可扩展的一维数组------向量、栈、队列和双端队列等，数据间不存在空隙，如果从序列中删除元素或将新元素插入到序列中，则此元素后的相关元素会被移动
  (2).稀疏序列都派生于CvSet，是由节点组成的序列，每个节点或者被占用空间或者是空，由flags标志指定。


4.标准的序列元素类型：
#define CV_SEQ_ELTYPE_POINT          CV_32SC2  /**< (x,y) */


#define CV_SEQ_ELTYPE_CODE           CV_8UC1   /**< freeman code: 0..7 */


#define CV_SEQ_ELTYPE_GENERIC        0


#define CV_SEQ_ELTYPE_PTR            CV_USRTYPE1


#define CV_SEQ_ELTYPE_PPOINT         CV_SEQ_ELTYPE_PTR  /**< &(x,y) */


#define CV_SEQ_ELTYPE_INDEX          CV_32SC1  /**< #(x,y) */


#define CV_SEQ_ELTYPE_GRAPH_EDGE     0  /**< &next_o, &next_d, &vtx_o, &vtx_d */


#define CV_SEQ_ELTYPE_GRAPH_VERTEX   0  /**< first_edge, &(x,y) */


#define CV_SEQ_ELTYPE_TRIAN_ATR      0  /**< vertex of the binary tree   */


#define CV_SEQ_ELTYPE_CONNECTED_COMP 0  /**< connected component  */


#define CV_SEQ_ELTYPE_POINT3D        CV_32FC3  /**< (x,y,z)  */


5.序列操作示例


CvMemStorage * mems = cvCreateMemStorage(0);
//CvSeq *seq = cvCreateSeq(CV_32FC1, sizeof(CvSeq), sizeof(float), mems);
CvSeq *seq = cvCreateSeq(CV_64FC1, sizeof(CvSeq), sizeof(double), mems);
cvSetSeqBlockSize(seq, 500);


for (double i = 500; i >= 0; i -= 1){
cvSeqPush(seq, &i);
}
double fNum[1024 * 10] = {0};
cvCvtSeqToArray(seq, fNum, CV_WHOLE_SEQ);
for (int i = 0; i < seq->total; i++){
printf("%f ", fNum[i]);
}
printf("\n");


cvSeqPop(seq);
printf("%d\n", seq->total);


double dbData = 1230;
cvSeqPushFront(seq, &dbData);
printf("%d\n", seq->total);


cvSeqPopFront(seq);
printf("%d\n", seq->total);


double fArr[] = {1,2,3,4,5,6,7,8,9,10};
cvSeqPushMulti(seq, fArr, 18, 0);
printf("%d\n", seq->total);


cvSeqInsert(seq, 5, &dbData);
printf("%d\n", seq->total);


cvSeqRemove(seq, 5);
printf("%d\n", seq->total);


for (int i = 0; i < seq->total; i++){//打印index
signed char *pT = cvGetSeqElem(seq, i);
int p = cvSeqElemIdx(seq, pT);
printf("%d\n", p);
}


CvMemStorage *mem = cvCreateMemStorage(0);
CvSeq *seq3 = cvSeqSlice(seq, CvSlice(0, seq->total), mem, seq->total);
printf("seq->total = %d\n", seq->total);
printf("seq3->total = %d\n", seq3->total);


CvSeq *seq4 = cvCloneSeq(seq);//拷贝到另外一个序列
printf("seq4->total = %d\n", seq4->total);

cvSeqRemoveSlice(seq, CvSlice(0, 1));//从序列中删除数据
printf("%d\n", seq->total);

cvSeqInsertSlice(seq, seq->total, seq3);//在序列seq中插入一个数组
cvCvtSeqToArray(seq, fNum, CV_WHOLE_SEQ);
for (int i = 0; i < seq->total; i++){
printf("%f ", fNum[i]);
}
printf("\n");


cvSeqInvert(seq);//逆序操作


//cvSeqSort(seq, CmpFunc, NULL);
CvSeqWriter seqWriter;
cvStartAppendToSeq(seq, &seqWriter);
cvStartWriteSeq(CV_64FC1, sizeof(CvSeq), sizeof(double), mem, &seqWriter);
cvEndWriteSeq(&seqWriter);




cvClearSeq(seq);
cvReleaseMemStorage(&mems);

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