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delphic++builderolevarianttwebbrowser

OleVariant and SafeSysFreeString

If I am using OleVariant instead of VARIANTARG to store VT_BSTR (VOleStr in OleVariant), do I still need to call SafeSysFreeString when I am done with the string, or is it called automatically by OleVariant, when it goes out of scope?

For example:

{
WB->Navigate("https://www.example.com");
while (WB->ReadyState != Shdocvw::READYSTATE_COMPLETE) Application->ProcessMessages();

DelphiInterface<IOleCommandTarget> pOleCmdTarget;
WB->Document->QueryInterface(IID_IOleCommandTarget, (void**)&pOleCmdTarget);

OleVariant v;

if (pOleCmdTarget->Exec(&CMDSETID_Forms3, IDM_FONTNAME, Shdocvw::MSOCMDEXECOPT_DONTPROMPTUSER, NULL, v)==S_OK)
    {
    // utilize v.VOleStr here...
    }
} // Does OleVariant auto-deallocate (SafeSysFreeString) here?
Solution

  • OleVariant will automatically free its data's memory for you when it goes out of scope.