"WMI" WMI for c++/com get system Information Process __c++

Using WMI to obtain system information procedures
As an example of obtaining a native system, the process of obtaining system information is as follows:
1 initialization of the COM library
Since the WMI application was written in C + + based on COM technology, the COM library must be initialized, when the call function CoInitializeEx is used to initialize the COM library.
HRESULT hres;
hres = CoInitializeEx (0, coinit_multithreaded);
if (FAILED (hres))
... {
cout << "Failed to initialize COM library. Error code = 0x "
<< hex << hres << Endl;
return 1; Program has failed.
} 2 initialize COM library security level
The call function CoInitializeSecurity is used to initialize the COM security level.
hres = CoInitializeSecurity (
Null
-1,//COM Authentication
NULL,//authentication Services
NULL,//Reserved
Rpc_c_authn_level_default,//DEFAULT Authentication
Rpc_c_imp_level_impersonate,//Default impersonation
NULL,//authentication Info
Eoac_none,//Additional capabilities
NULL//Reserved
);

if (FAILED (hres))
... {
cout << "Failed to initialize security. Error code = 0x "
<< hex << hres << Endl;
CoUninitialize ();
return 1; Program has failed.
} 3) connecting to the WMI namespace
Initializes the WMI locator (an instance of the IWbemLocator type) by calling CoCreateInstance.
hres = CoCreateInstance (
Clsid_wbemlocator,
0,
Clsctx_inproc_server,
Iid_iwbemlocator, (LPVOID *) & Ploc);

if (FAILED (hres))
... {
cout << "Failed to create IWbemLocator object."
<< "ERR code = 0x"
<< hex << hres << Endl;
CoUninitialize ();
return 1; Program has failed.
{4) Creating the WMI service
Calls the IWbemLocator::ConnectServer method, which connects to the WMI namespace through this locator, and creates the service by passing an instance of IWbemServices to the ConnectServer method as a parameter. If we need some BIOS information, the WMI provider you need to use is Win32_BIOS, and you need to connect to the Root//cimv2 namespace.
IWbemServices * psvc = NULL;
hres = Ploc-> connectserver (
_bstr_t (L "root/cimv2"),//Object Path of WMI namespace
NULL,//User name. NULL = Current User
NULL,//User password. NULL = Current
0,//Locale. NULL indicates current
NULL,//security flags.
0,//authority (e.g. Kerberos)
0,//context Object
& PSVC//Pointer to IWbemServices Proxy
);

if (FAILED (hres))
... {
cout << "could not connect. Error code = 0x