Plugin for controlling Internet Explorer

dRaakje · 31st October 2003, 13:23

Just relalized something. I think the problem is with bstr ownership.
When I do this:
vtBandGUID1.bstrVal = _bstr_t(szBarCLSID);

the _bstr_t class knows its being assigned to another BSTR and so relinguishes control over the BSTR (Or allocates a new BSTR)

When I do:
vtBandGUID2.bstrVal = bBarCLSID;

Nothing special is done and the call of ShowBandObject doesn't have access to the bstr that is being passed on.
VariantClear() afterwards isn't even necessary...

Or am I completely off track here... I have to admit, I've been bluffing my way through COM without really understanding it :P

Remco

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31st October 2003, 13:23	#1
dRaakje Junior Member Join Date: Oct 2003 Location: Netherlands Posts: 23	Just relalized something. I think the problem is with bstr ownership. When I do this: vtBandGUID1.bstrVal = _bstr_t(szBarCLSID); the _bstr_t class knows its being assigned to another BSTR and so relinguishes control over the BSTR (Or allocates a new BSTR) When I do: vtBandGUID2.bstrVal = bBarCLSID; Nothing special is done and the call of ShowBandObject doesn't have access to the bstr that is being passed on. VariantClear() afterwards isn't even necessary... Or am I completely off track here... I have to admit, I've been bluffing my way through COM without really understanding it :P Remco