returning strings in a COM method 1

[johpje]

Hi all,

I'm making a COM object in VC++, but I have a problem with a method returning a string.

the code in the COM class is goes like this:

STDMETHODIMP CCOMCLASS::get_String(/* [out/retval] */BSTR *pVal){
	_bstr_t tmp;
	tmp = _bstr_t(XXX);
	*pVal = tmp;
	return S_OK;
}

when i call the method in VB:

    op$ = myComClass.String()

I only get the first character of the string.
and if i replace

	*pVal = tmp;

with

	pVal = new BSTR(tmp);

it returns an empty string.

Can anyone tell me how to resolve this?
Do i have to send an existing fixed length string? If so; how do i modify the strings contents?

thanks,
Johpje

 

[Cagliostro]

I think you should do like this:
STDMETHODIMP CCOMCLASS::get_String(/* [out/retval] */BSTR *pVal){
*pVal = SysAllocString((BSTR)_bstr_t(XXX));
return S_OK;
}

Ion Filipski

ICQ: 95034075
AIM: IonFilipski
filipski@excite.com

 

[johpje]

duh!!

Thanks a lot mate!!