Very Computer

Hello Folks

I need some help - I guess I'm missing some very fundamental point
somewhere.  I am attempting to write some simple data structures as a Stream
in the Root storage of a new "docfile" - my first attempt at utilizing
structured storage files.  I, uh, well, can't get the "write to file"
function to compile.  In that function, I have declared the Storage and
Stream as:

LPSTORAGE pIStorage;
LPSTREAM  pIStream;

I create the (temporary) file using:

 hr=StgCreateDocfile(0,
STGM_CREATE | STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_DIRECT,
  0, &pIStorage);

When I enter the code such as the line below, as I type "pIStorage->" the
text editor automatic statement completion properly offers the associated
methods pop-up box. Among the options is the CreateStream method.   I have
entered the following statement:

 hr=pIStorage->CreateStream("CONTENTS",
  STGM_CREATE | STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_DIRECT,
  0, 0, &pIStream);

When I attempt to compile the functions containing this and other statements
such as pIStream->Write(...), pIStream->Release(), etc. I get error messages
only for those statements referencing IStorage and IStream methods and the
errors say:

   error C2039: 'CreateStream' : is not a member of 'IStorage'
   see declaration of 'IStorage'

or otherwise as appropriate.

I find this rather confusing since the IDE editor seems to think
CreateStream is a method of IStorage, but the compiler doesn't.  As I said,
I'm probably overlooking something obvious in my first go at this.  Can
someone please show me the error of my ways?

Thanks!

Don

What a confusing language is C++, isn't it? You're trying to invoke
inexistent method CreateStream which takes LPCSTR as the
first parameter. There is a method with the same name which
accepts LPCWSTR as the first parameter and that's why the
auto-complete feature of VC++ kicks in and gives you the method
signature. If you have paid close attention, the parameter type is
outlined along with its name...

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Alexander Nickolov, MCP
Panasonic Technologies Inc.
Speech Technology Laboratory

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