wstring转BSTR和VARIANT
wstring str=L"haha";
BSTR bstr = SysAllocString(str.c_str());
VARIANT var;
var.vt = VT_BSTR;
var.bstrVal = bstr;
BSTR和VARIANT转wstring
BSTR bstr = L"hahah";
VARIANT var;
var.vt = VT_BSTR;
var.bstrVal = L"bbbb";
wstring str = (_bstr_t)bstr;
wstring str2 = (_bstr_t)var.bstrVal;
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