windows下WMI使用C++查询用户硬件信息

最近需要做下用户信息统计，发现WMI真是个好东西，同时觉得COM这东西，还真不能少>_<！！

下面是源码：

/********************************************************************
	created:	2014/02/18
	author:		baesky
	
	purpose:	Gater user infomation
*********************************************************************/
#include <comdef.h>
#include <Wbemidl.h>

# pragma comment(lib, "wbemuuid.lib")

struct UserInfo
{
	/** your spec*/
};

/** video card and OS */
bool GetUserInfo(UserInfo& Info)
{
	HRESULT hres;

	hres =  CoInitialize( NULL );
	if (FAILED(hres))
	{
		return false;                 
	}

	hres =  CoInitializeSecurity(
		NULL, 
		-1,                          
		NULL,                        
		NULL,                        
		RPC_C_AUTHN_LEVEL_DEFAULT,   
		RPC_C_IMP_LEVEL_IMPERSONATE, 
		NULL,                        
		EOAC_NONE,                   
		NULL                         
		);


	if (FAILED(hres))
	{
		CoUninitialize();
		return false;                   
	}

	IWbemLocator *pLoc = NULL;

	hres = CoCreateInstance(
		CLSID_WbemLocator,             
		0, 
		CLSCTX_INPROC_SERVER, 
		IID_IWbemLocator, (LPVOID *) &pLoc);

	if (FAILED(hres))
	{
		CoUninitialize();
		return false;                 
	}

	IWbemServices *pSvc = NULL;

	hres = pLoc->ConnectServer(
		_bstr_t(L"ROOT\\CIMV2"), 
		NULL,                    
		NULL,                    
		0,                       
		NULL,                    
		0,                       
		0,                       
		&pSvc                    
		);

	if (FAILED(hres))
	{
		pLoc->Release();     
		CoUninitialize();
		return false;               
	}

	hres = CoSetProxyBlanket(
		pSvc,                        
		RPC_C_AUTHN_WINNT,           
		RPC_C_AUTHZ_NONE,            
		NULL,                        
		RPC_C_AUTHN_LEVEL_CALL,      
		RPC_C_IMP_LEVEL_IMPERSONATE, 
		NULL,                        
		EOAC_NONE                    
		);

	if (FAILED(hres))
	{
		pSvc->Release();
		pLoc->Release();     
		CoUninitialize();
		return false;               
	}

	IEnumWbemClassObject* pEnumerator = NULL;
	hres = pSvc->ExecQuery(
		bstr_t("WQL"), 
		bstr_t("SELECT * FROM Win32_OperatingSystem"),
		WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
		NULL,
		&pEnumerator);

	if (FAILED(hres))
	{
		pSvc->Release();
		pLoc->Release();
		CoUninitialize();
		return false;               
	}

	IWbemClassObject *pclsObj;
	ULONG uReturn = 0;

	while (pEnumerator)
	{
		HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
			&pclsObj, &uReturn);

		if(0 == uReturn)
		{
			break;
		}

		VARIANT vtProp;

		hr = pclsObj->Get(L"Caption", 0, &vtProp, 0, 0);  //os
		//vtProp.bstrVal is what you need.

		//VariantClear(&vtProp);
		//hr = pclsObj->Get(L"CSDVersion", 0, &vtProp, 0, 0); // example "sp3"
		//VariantClear(&vtProp);
		//hr = pclsObj->Get(L"OSArchitecture", 0, &vtProp, 0, 0); // example x64
		//VariantClear(&vtProp);

		pclsObj->Release();
	}
	
	pEnumerator->Release();
	pEnumerator=NULL;
	hres = pSvc->ExecQuery(
		bstr_t("WQL"), 
		bstr_t("SELECT * FROM Win32_VideoController"),
		WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
		NULL,
		&pEnumerator);

	if (FAILED(hres))
	{
		pSvc->Release();
		pLoc->Release();
		CoUninitialize();
		return false;               
	}

	while (pEnumerator)
	{
		HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
			&pclsObj, &uReturn);

		if(0 == uReturn)
		{
			break;
		}

		VARIANT vtProp;

		hr = pclsObj->Get(L"Caption", 0, &vtProp, 0, 0);  //video desc
                /** 
                  .,,,,,,,,,,,,,,,,,,,,,,your logic
                 */
		VariantClear(&vtProp);
		pclsObj->Release();
	}

	pEnumerator->Release();
	pEnumerator=NULL;
	hres = pSvc->ExecQuery(
		bstr_t("WQL"), 
		bstr_t("SELECT * FROM Win32_Processor"),
		WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
		NULL,
		&pEnumerator);

	if (FAILED(hres))
	{
		pSvc->Release();
		pLoc->Release();
		CoUninitialize();
		return false;               
	}

	while (pEnumerator)
	{
		HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, 
			&pclsObj, &uReturn);

		if(0 == uReturn)
		{
			break;
		}

		VARIANT vtProp;

		hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);  //video desc
		 /** 
                  .,,,,,,,,,,,,,,,,,,,,,,your logic
                 */
		VariantClear(&vtProp);
		pclsObj->Release();
	}
	
	pSvc->Release();
	pLoc->Release();
	pEnumerator->Release();
	
	CoUninitialize();

	return true;
}