Microsoft KB Archive/193558

= COleServerDoc and CArchive Corrupts Large Files =

Article ID: 193558

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q193558



SYMPTOMS
Applications that use the IStorage and IStream classes, or other classes derived from them, to save data in the form of OLE Structured Storage may generate corrupted data files when the size of the output file exceeds some threshold.

For example, an application that uses the CArchive method of the COleServerDoc base class may result in the following error being generated or logged:

0x80030109 (STG_E_DOCFILECORRUPT)

In such cases, the resultant output file may be smaller than expected with the first part of the file being overwritten with data that should have been near the end of the file.



CAUSE
The code that implements this functionality uses one of two modes of operation depending on the amount of memory that is available in a particular memory heap. A problem in the low-memory mode results in the output file being corrupted. Generation of a large or very fragmented file may tend to use up more of the memory in this heap, resulting in corrupted output being generated.

The size threshold at which corruption takes place will depend on various factors unique to each system but would typically only affect files larger than 80 MB.



RESOLUTION
A supported fix that corrects this problem is now available from Microsoft, but has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

The English version of this fix should have the following file attributes or later:

  Date      Time                 Size    File Name     Platform -  09/25/98  01:07p              698,640  Ole32.dll     (x86) 03/24/98 06:02p              102,160  Rpcss.exe     (x86)

09/25/98 01:07p            1,249,552  Ole32.dll     (Alpha) 03/24/98 06:04p              181,008  Rpcss.exe     (Alpha)



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0.

Additional query words: 4.00

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB193558

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