GetFormRegionStorage

Jeff Moll · Joined: 22 Aug 2007 Posts: 1

Hi There!

I'm writing a add-in for Outllook, in unmanaged C++ ( crazy I know ) and am
trying to return a form region from my resources. In the doc’s it says:

Return Value:
“A Variant object representing the storage that Outlook has allocated for
the form region. The type of the return value can be: String representing
that the return value is a local path to an Outlook Form Storage (.OFS) file;
Byte() representing that the return value is an array of bytes that contains
the contents of the .OFS file; IStorage representing that the return value is
a COM storage object IStorage (for C++ only); Nothing or Null, representing
that Outlook could not allocate storage for this form region and will not
load the form region.”

What exactly is a “Byte()” in COM terms? I’ve assumed a COM SafeArray but I
can’t seem to get this working.

If I can’t make a “Byte()” work, how does Outlook use the IStorage
interface? Does it try to open the .ofs file as a named stream within it?

Thank for your help!

Archived from group: microsoft>public>outlook>program_addins

Luk · Joined: 14 Aug 2007 Posts: 1

It's a byte[]

"Jeff Moll" wrote:

> Hi There!
>
> I'm writing a add-in for Outllook, in unmanaged C++ ( crazy I know ) and am
> trying to return a form region from my resources. In the doc’s it says:
>
> Return Value:
> “A Variant object representing the storage that Outlook has allocated for
> the form region. The type of the return value can be: String representing
> that the return value is a local path to an Outlook Form Storage (.OFS) file;
> Byte() representing that the return value is an array of bytes that contains
> the contents of the .OFS file; IStorage representing that the return value is
> a COM storage object IStorage (for C++ only); Nothing or Null, representing
> that Outlook could not allocate storage for this form region and will not
> load the form region.”
>
> What exactly is a “Byte()” in COM terms? I’ve assumed a COM SafeArray but I
> can’t seem to get this working.
>
> If I can’t make a “Byte()” work, how does Outlook use the IStorage
> interface? Does it try to open the .ofs file as a named stream within it?
>
> Thank for your help!
>

Jeff Moll · Joined: 22 Aug 2007 Posts: 1

No offence intended, but that is a less than useful response, particularly
since it is included in the documentation I quoted in the original post.

As it turns out, Outlook is expecting a VARIANT containing a Safearray as
below:

Storage->vt = VT_ARRAY | VT_UI1;
Storage->parray = parray;

"Luk" wrote:

> It's a byte[]
>
> "Jeff Moll" wrote:
>
> > Hi There!
> >
> > I'm writing a add-in for Outllook, in unmanaged C++ ( crazy I know ) and am
> > trying to return a form region from my resources. In the doc’s it says:
> >
> > Return Value:
> > “A Variant object representing the storage that Outlook has allocated for
> > the form region. The type of the return value can be: String representing
> > that the return value is a local path to an Outlook Form Storage (.OFS) file;
> > Byte() representing that the return value is an array of bytes that contains
> > the contents of the .OFS file; IStorage representing that the return value is
> > a COM storage object IStorage (for C++ only); Nothing or Null, representing
> > that Outlook could not allocate storage for this form region and will not
> > load the form region.”
> >
> > What exactly is a “Byte()” in COM terms? I’ve assumed a COM SafeArray but I
> > can’t seem to get this working.
> >
> > If I can’t make a “Byte()” work, how does Outlook use the IStorage
> > interface? Does it try to open the .ofs file as a named stream within it?
> >
> > Thank for your help!
> >

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