Error LNK2019: unresolved external symbol "char * __stdcall _com_util::ConvertBSTRToString(wchar_t *)"

Error 2 error LNK2019: unresolved external symbol "char * __stdcall _com_util::ConvertBSTRToString(wchar_t *)" (<?ConvertBSTRToString@_com_util@@YGPADPA_W@Z>) referenced in function "public: char const * __thiscall _bstr_t::Data_t::GetString(void)const " (<?GetString@Data_t@_bstr_t@@QBEPBDXZ>) main.obj CPUTest

I met this error when programming a WMI C++ query application.

MSDN Says :When calling a function in a static library or DLL that takes a wchar_t type (note that BSTR and LPWSTR resolve to wchar_t*), you may get an LNK2001 unresolved external symbol error.This error is caused by the /Zc:wchar_t compiler option, which is set to on by default in new MFC projects. This option causes the compiler to treat wchar_t as a native type. Before Visual C++ .NET, wchar_t was treated as an unsigned short.If the main project and library do not use the same setting for /Zc:wchar_t, this will cause a mismatch of function signatures. To avoid this problem, rebuild the library with the /Zc:wchar_t compiler option, or turn it off in the main project using the Treat wchar_t as Built-in Type setting on the Language property page in the Property Pages dialog box.

Add this:
#ifdef _DEBUG
# pragma comment(lib, "comsuppwd.lib")
# pragma comment(lib, "comsuppw.lib")
# pragma comment(lib, "wbemuuid.lib")