getinfo(float *info) {}

How can I use this method in VB ?
I tried:
Dim i as single
getinfo(i)

But at runtime it says : "wrong argument type"

The problem is coming from the float* I guess.
Is there a solution ?

Thanks
Ludovic Launer

HRESULT GetInfo(float *info)

with a type lib def like this

HRESULT GetInfo([out,retval] float *info)

if that is the case, you would access the method like this

Dim i as single
i=getinfo()

since a return value to VB is the final argument to VC.

Vincent Minden

I added a method using the class wizard. Could that be the problem ?
In that case how should I declare in VC a method for my activeX which would
be able to change the values of its given parameters ?

Same kind of question : Can a VC method in an activeX control return an
"array" which could be used in VB ? how ?

Thanks.

Ludovic Launer

void getinfo([in, out] single* info);

I believe.  Then recompile the COM object and try it again in VB.

As for Arrays, yes, however, it's not as easy as you'd hope.  (i.e. the code
above is not the right first step.)  If it's pure VB (not VBScript), I
believe you can get away with:

void getmoreinfo([out, in] long * psizeInOut, [out, size_is(*psizeInOut)]
single arrayOut[]);

However, I'm not 100% sure that will work, and it's definitely not
recommended.

The "right" way to do it is with a SAFEARRAY, but that's a complicated topic
in and of itself:

void getsafeinfo([out,retval] VARIANT* info);

where the Variant contains the SAFEARRAY.  FWIW, I highly recommend picking
up a book on this topic.  Which book depends on whether you're using ATL or
MFC or coding this stuff manually.

One final topic, you might try the following newsgroups for COM stuff.
You'll get a little better response to these types of questions:

microsoft.public.vc.mfcole  (If you're using MFC to write your ActiveX
stuff)
microsoft.public.vc.activex.templatelib (If you're using ATL to write your
ActiveX stuff)
microsoft.public.win32.programmer.ole (Generic COM group)

HTH

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