Permission Denied in IE w/ iDispatch DISPATCH_PROPERTYGET

Question

Howdy,

I have a activex control that I've written using ATL, and am running into a somewhat serious and confusing problem.

when iDispatch::Invoke is called with DISPATCH_PROPERTYPUT/METHOD everything is fine..

when a return a value to javascript/ie after a method call of a VT_BSTR/with a valid BSTR it works fine and has been.

but when I try var stringValue = Object.stringValue which calls iDispatch/Invoke with the DISPATCH_PROPERTYGET flag and i set the return value to VT_BSTR with a valid BSTR (the exact same one i use with the method calls)

I get a permission denied error box in IE..

now when I return various other datatypes (longs.integers.bool's ..etc) to javascript/ie it works fine (with propertyget / method)

i only get permission denied when returning VT_BSTR

any ideas?/tips?

Answer 1

In your comment above, you're casting c to a BSTR. What is c? If you're not actually calling SysAllocString() to create the BSTR, that could very well be the source of your problem.

Consider using CComBSTR or CComVARIANT to aide you in the process, and also please read Eric's complete guide to BSTR semantics.