Converting BSTR/CString to _bstr_t

[Anonymous]

Does anyone know how to convert BSTR/CString to _bstr_t

[Joao Paulo Figueira]

The _bstr_t constructors accepts both const TCHAR * and BSTR, so it should be direct:

CString strOne(_T("One"));
_bstr_t bstr(strOne);

[Anonymous]

I'm getting this error: error LNK2019: unresolved external symbol "void __cdecl _com_issue_error(long)" (?_com_issue_error@@YAXJ@Z) referenced in function "public: __thiscall _bstr_t::_bstr_t(unsigned short const *)" (??0_bstr_t@@QAE@PBG@Z) Any suggestions?

[Joao Paulo Figueira]

Anonymous wrote: Any suggestions? Yes. You have to declare this function in order to trap COM errors. This function will only be declared once. You can use the following:

void __stdcall _com_issue_error(HRESULT m_hr)
{
TCHAR pcszError[1024];

\_stprintf(pcszError, TEXT("\_com\_issue\_error(%ld)\\n"), m\_hr);
OutputDebugString(pcszError);

}

[Mike Dimmick]

I'd avoid _bstr_t altogether. Use ATL's CComBSTR. It's smaller.