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COleDocument double size

Posted on 1998-08-22
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Last Modified: 2013-11-20
I have a COleDocument, default from AppWizard, with a call to EnableCompoundFile() on the constructor.
When I save an existing document, the size is doubled. For example, a new name document save to 83k, and if I save it again, it got 163k and stay to this size on future save.
Does someone know why, and a workaround to always save like the first time (why the littlest size) ?
I cannot change the document format (not calling EnableCompoundFile() to get a flat document for example), because I absolutely need a compatibility with older documents.
I’ve try to force m_strPathName to empty before OnSaveDocument, or delete the file, but the document already open in my application is locked and cannot be created or deleted.

Thank you for your help.
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Question by:dmunoz
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Expert Comment

by:Answers2000
ID: 1321149
I think this is a consequence of OLE compound files rather than anything you're doing.

I know some M$ apps generate hug files.  PC World had a utility (command line) a while a go to recover space.
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Author Comment

by:dmunoz
ID: 1321150
Yes, I think too that it's an OLE consequence.
But I cannot switch to flat (not OLE) because of my need to
keep compatibility with old files.

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Expert Comment

by:Bridge
ID: 1321151
COleDocument is the base for documents that support visual editing. This requires extra functionality, primarily the presentation data associated with the OLE document. Seeing as this is a data is in the form of a metafile it will take up plenty of space.
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Author Comment

by:dmunoz
ID: 1321152
Ok Bridge, but it dont explain with the first save is smaller than the others. What I need is an explanation why this size is double, an possibly a way to work araound, and save next documents in the form of the first one.

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Author Comment

by:dmunoz
ID: 1321153
Ok, this seem to be a hard one...
so, I double the price ;-))

Please help...

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Accepted Solution

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Bridge earned 200 total points
ID: 1321154
Right lets try again.
The IStorage object within the OLE Document m_lpRootStg saves itself using the commit command within the OLEDOC1.cpp file. The parameter it uses is STGC_ONLYIFCURRENT. From the help this seems to be a 'safe' commit which preservers data. To avoid this the STGC_OVERWRITE should be used instead.
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Author Comment

by:dmunoz
ID: 1321155
Thank you Bridge.
Your answer perfectly fit my need.

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