VC ATL, Safearray and IDL??

M
#1 / 4

Safearray and IDL??

Hi Folks,

I want pass back an Array on strings, so I thought I would use SAFEARRAY
*pMyArray, but the MIDL complains that SAFEARRAY* is a PVOID and it doesn't
like VOIDS, PVOIDS etc.

Any idea what to do??

Cheers

Martin

Thu, 23 Sep 2004 23:21:55 GMT

Jeff Henkel
#2 / 4

Safearray and IDL??

Embed the SAFEARRAY in a LPVARIANT. i.e. something like this:

STDMETHODIMP CMyClass::MyMethod(/*[out, retval]*/ LPVARIANT pMyArray)
{
if (pMyArray)
{
VariantInit(*pMyArray);
pMyArray->vt = VT_BSTR | VT_ARRAY;
pMyArray->parray = SafeArrayCreateVector(VT_BSTR, 0, nStrings);
// fill the array
return S_OK;
}
return E_INVALIDARG;

Quote:

}

Quote:

> Hi Folks,

> I want pass back an Array on strings, so I thought I would use
SAFEARRAY
> *pMyArray, but the MIDL complains that SAFEARRAY* is a PVOID and it
doesn't
> like VOIDS, PVOIDS etc.

> Any idea what to do??

> Cheers

> Martin

Fri, 24 Sep 2004 04:11:58 GMT

Edwin Schil
#3 / 4

Safearray and IDL??

I think he means something different.

try the following in IDL:

typedef SAFEARRAY(LONG) MyData ; // Use your datatype instead of
LONG

[id(1), helpstring("MyFunc")] HRESULT MyFunc([out]MyArray* MyData);

Edwin

Quote:

> Embed the SAFEARRAY in a LPVARIANT. i.e. something like this:

> STDMETHODIMP CMyClass::MyMethod(/*[out, retval]*/ LPVARIANT pMyArray)
> {
> if (pMyArray)
> {
> VariantInit(*pMyArray);
> pMyArray->vt = VT_BSTR | VT_ARRAY;
> pMyArray->parray = SafeArrayCreateVector(VT_BSTR, 0, nStrings);
> // fill the array
> return S_OK;
> }
> return E_INVALIDARG;
> }

> > Hi Folks,

> > I want pass back an Array on strings, so I thought I would use
> SAFEARRAY
> > *pMyArray, but the MIDL complains that SAFEARRAY* is a PVOID and it
> doesn't
> > like VOIDS, PVOIDS etc.

> > Any idea what to do??

> > Cheers

> > Martin

Fri, 24 Sep 2004 15:04:57 GMT

M
#4 / 4

Safearray and IDL??

Thanks both for some really usefull suggestions!!
Martin

Quote:

> I think he means something different.

> try the following in IDL:

> typedef SAFEARRAY(LONG) MyData ; // Use your datatype instead of
> LONG

> [id(1), helpstring("MyFunc")] HRESULT MyFunc([out]MyArray* MyData);

> Edwin

> > Embed the SAFEARRAY in a LPVARIANT. i.e. something like this:

> > STDMETHODIMP CMyClass::MyMethod(/*[out, retval]*/ LPVARIANT pMyArray)
> > {
> > if (pMyArray)
> > {
> > VariantInit(*pMyArray);
> > pMyArray->vt = VT_BSTR | VT_ARRAY;
> > pMyArray->parray = SafeArrayCreateVector(VT_BSTR, 0, nStrings);
> > // fill the array
> > return S_OK;
> > }
> > return E_INVALIDARG;
> > }

> > > Hi Folks,

> > > I want pass back an Array on strings, so I thought I would use
> > SAFEARRAY
> > > *pMyArray, but the MIDL complains that SAFEARRAY* is a PVOID and it
> > doesn't
> > > like VOIDS, PVOIDS etc.

> > > Any idea what to do??

> > > Cheers

> > > Martin

Sat, 25 Sep 2004 04:02:15 GMT