BSTR和QString互转

1、QString转BSTR：

std::wstring str_ = QString("some texts").toStdWString();
BSTR bstr_ = SysAllocString(str_.c_str());

2、BSTR转QString：

BSTR bstrTest = SysAllocString(L"ConvertMe");
QString qstringTest = QString::fromUtf16(bstrTest);