When I use the POI-HLSF to extract the text from the slides.
My code is very easy:
PowerPointExtractor ppe = new PowerPointExtractor("c:\\4.ppt");
String s = ppe.getText(true,true);
System.out.println(s);
ppe.close();
But there is a error:
java.lang.ClassCastException: org.apache.poi.hslf.record.Slide cannot be
cast to org.apache.poi.hslf.record.MainMaster
I trace the bug, I find that:
For the ppt which has more than 2(include 2) MainMasters, the SlideShow
Constructor could not correctly to get MasterRecords:
SlideListWithText masterSLWT =
_documentRecord.getMasterSlideListWithText();
SlideListWithText slidesSLWT = _documentRecord.getSlideSlideListWithText();
SlideListWithText notesSLWT = _documentRecord.getNotesSlideListWithText();
//find master slides
SlideAtomsSet[] masterSets = new SlideAtomsSet[0];
org.apache.poi.hslf.record.MainMaster[] masterRecords = null;
if (masterSLWT != null){
masterSets = masterSLWT.getSlideAtomsSets();
masterRecords = new org.apache.poi.hslf.record.MainMaster[
masterSets.length];
for(int i=0; i<masterRecords.length; i++) {
masterRecords[i] = (org.apache.poi.hslf.record.MainMaster
)getCoreRecordForSAS(masterSets[i]);
}
}
Eg. The masterSets.length =2, but there is only 1 master records in the
MostRecentCoreRecords, so the there will be a casting error.
And I also find that the test data given in the Src dir, all ppt file are
simple, all of them have only 1 master slide,
Did anyone test the ones which have more than 2 master slides?
--
With respects,
Mingfan.Lu
