Question about dm_document and dmr_content object

Hi, all

I think i need to read the rendition of a document in. But when I try by IDfSysObject.getContent(). It seems I was wrong. Because I can't cast it to IDfSysObject object. Is dmr_content object a IDfPersistentObject object but not IDfSysObject object? And does anyone can tell me how to read a dmr_content object's contents in??

Thanks!

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mszurap

Content (dmr_content) is not Sysobject so you cannot cast it to IDfSysObject.

Per documentation IDfSysObject.getRenditions(attrNames) returns only attributes (collection of DfTypedObjects) of the content object. As I wrote, you can get the content of it with getContentEx...

All comments

mszurap

Look at IDfSysObject's JavaDocs:

public ByteArrayInputStream getContentEx(String format, int pageNumber) throws DfException

zhoujz

Hi,Miklos Szurap.

Thanks for aplay.

I think i had made your misunderstanding. What I want to know is a rendition object is instance of IDfPersistentObject but not that of IDfSysObject right or not?

My code is as below:

.............IDfCollection renditionCollection = object.getRenditions(RENDITION_ATTR);     
if(null == renditionCollection)
{
  return;
}

while (renditionCollection.next())
{
  strErrorMessage = "Error occured while trying to get the rendition's information.";
  // Get the format name of the rendition.
  String strFormat = renditionCollection.getString("full_format");
  // Get the rendition's object_id.
  IDfId renditionObjectId = renditionCollection.getId("r_object_id");
  if (!strFormat.equals(DeleteRenditionAction.JPEG2000))
  {
      continue;
  }
  else  {          // It throw class cast exception here
      IDfSysObject object =(IDfSysObject) session.getObject(renditionObjectId);  }
}//End of while loop
...............

mszurap

Content (dmr_content) is not Sysobject so you cannot cast it to IDfSysObject.

Per documentation IDfSysObject.getRenditions(attrNames) returns only attributes (collection of DfTypedObjects) of the content object. As I wrote, you can get the content of it with getContentEx...