Does FiltDump.exe support calling IPersistStorage

Question

Hello,

I have one IFilter that supports IPersistStream, and FiltDump calls its Load function, allowing for the debugging of the code.  I need to create another IFilter that supports IPersistStorage, but even after implementing all the interfaces, it's not calling the corresponding Load function.  I would just like confirmation that testing of IPersistStorage IS supported, or that someone has been able to get it working.

Much appreciated.

Rick

Answer 1

Well, I see now that Windows Search does not support IPersistStorage (http://msdn.microsoft.com/en-us/library/windows/desktop/dd940429(v=vs.85).aspx), so there'd be no reason for FiltDump to support.  What's not clear, then, is how Windows Search handles an OLE Compound file.  Is there a way to get to the IStorage from an IStream?

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Rick Mutzke Principal Software Developer Corel Corporation

Answer 2

I'll answer my own question :-)

1. Create an empty LockByteStream, and do a setStream on your IStream.

2. Call StgIsStorageILockBytes on the LockByteStream.

3. Call StgOpenStorageOnILockBytes using the LockByteStream, which returns a pointer to the IStorage.

Bob's your uncle.

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Rick Mutzke Principal Software Developer Corel Corporation