WMI and Variables

[grocerykid]

I am struggling to find an answer to this one and i am wondering if any of you can help me:
When accessing WMI in C++ you would normally go something like this:

IEnumWbemClassObject* pEnumerator = NULL;
    hr = pSvc->ExecQuery(
        BSTR(L"WQL"), 
        BSTR(L"SELECT * FROM Win32_ComputerSystem"),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,
        &pEnumerator);

But instead of just hard coding L"SELECT * FROM Win32_ComputerSystem"
is there a way that I can just use a standard char* or WCHAR*?

Any help would be greatly appreciated

[JLBorges]

#include <iostream>
#include <string>
#include <windows.h>

int main()
{
    std::wstring wstr ;
    std::wcout << L"? " && std::getline( std::wcin, wstr ) ;
    BSTR bstr = ::SysAllocStringLen( wstr.data(), wstr.size() ) ; // wstring to BSTR

    std::wstring wstr_cpy( bstr, ::SysStringLen(bstr) ) ; // BSTR to wstring
    ::SysFreeString(bstr) ;
    std::wcout << wstr_cpy << L'\n' ;
}