How to modify the data sequence of the dataset

[liuxinming]

The first part of my codes:

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DcmFileFormat fileformat;
OFCondition cond=fileformat.loadFile(sFileName.GetBuffer(0),EXS_JPEGProcess1);
DcmPixelData *pPixData;
cond=pDataset->findAndGetElement(DCM_PixelData,(DcmElement *&)pPixData);

Now I can manage the pixel data.

The second part:

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DcmPixelSequence *pSeq = NULL;
E_TransferSyntax xferSyntax = EXS_Unknown;
const DcmRepresentationParameter *rep = NULL;
cond=pPixData->getEncapsulatedRepresentation(xferSyntax, rep, pSeq);

by which I can operate the pixel sequence.

The third part:

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 DcmPixelItem *pItem;
cond=pSeq->getItem(pItem,j);
DcmPixelItem *pItemBk=(DcmPixelItem *)pItem->clone();
DcmPixelSequence *pNewSeq=new DcmPixelSequence(DCM_PixelData);
cond=pNewSeq->insert(pItemBk);
cond=pDataset->insert(pNewSeq,TRUE,TRUE);

But I don't believe that it will work well, though the cond is still "Normal".

These are all testing codes. What I hope to do are deleting some special frames in a large multiframe file and saving the rest into another file which has the same VR.