注释请参考：http://www.jianshu.com/p/4aefd84031d0

// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"


#define _WIN32_DCOM //com组件
#include <iostream> 
#include <iomanip>//setw函数设置位宽
using namespace std;
#include <comdef.h>
#include <Wbemidl.h>

#pragma comment(lib, "wbemuuid.lib") //链接动态数据库

int main(int argc, char **argv)
{
    HRESULT hres;

    // Initialize COM.
    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.
    }

    // Initialize 
    hres = CoInitializeSecurity(
        NULL,
        -1,      // COM negotiates service                  
        NULL,    // Authentication services
        NULL,    // Reserved
        RPC_C_AUTHN_LEVEL_DEFAULT,    // authentication
        RPC_C_IMP_LEVEL_IMPERSONATE,  // 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.
    }

    // Obtain the initial locator to Windows Management
    // on a particular host computer.
    IWbemLocator *pLoc = 0;

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

    if (FAILED(hres))
    {
        cout << "Failed to create IWbemLocator object. "
            << "Error code = 0x"
            << hex << hres << endl;
        CoUninitialize();
        return 1;       // Program has failed.
    }

    IWbemServices *pSvc = 0;

    // Connect to the root\cimv2 namespace with the
    // current user and obtain pointer pSvc
    // to make IWbemServices calls.

    hres = pLoc->ConnectServer(

        _bstr_t(L"ROOT\\CIMV2"), // WMI namespace
        NULL,                    // User name
        NULL,                    // User password
        0,                       // Locale
        NULL,                    // Security flags                 
        0,                       // Authority       
        0,                       // Context object
        &pSvc                    // IWbemServices proxy
        );

    if (FAILED(hres))
    {
        cout << "Could not connect. Error code = 0x"
            << hex << hres << endl;
        pLoc->Release();
        CoUninitialize();
        return 1;                // Program has failed.
    }

    cout << "Connected to ROOT\\CIMV2 WMI namespace" << endl;

    // Set the IWbemServices proxy so that impersonation
    // of the user (client) occurs.
    hres = CoSetProxyBlanket(

        pSvc,                         // the proxy to set
        RPC_C_AUTHN_WINNT,            // authentication service
        RPC_C_AUTHZ_NONE,             // authorization service
        NULL,                         // Server principal name
        RPC_C_AUTHN_LEVEL_CALL,       // authentication level
        RPC_C_IMP_LEVEL_IMPERSONATE,  // impersonation level
        NULL,                         // client identity 
        EOAC_NONE                     // proxy capabilities     
        );

    if (FAILED(hres))
    {
        cout << "Could not set proxy blanket. Error code = 0x"
            << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;               // Program has failed.
    }


    // Use the IWbemServices pointer to make requests of WMI. 
    // Make requests here:

    // For example, query for all the running processes
    IEnumWbemClassObject* pEnumerator = NULL;
    hres = pSvc->ExecQuery(
        bstr_t("WQL"),
        bstr_t("SELECT * FROM Win32_Process"),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
        NULL,
        &pEnumerator);

    if (FAILED(hres))
    {
        cout << "Query for processes failed. "
            << "Error code = 0x"
            << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;               // Program has failed.
    }
    else
    {
        IWbemClassObject *pclsObj;
        ULONG uReturn = 0;

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

            if (0 == uReturn)
            {
                break;
            }

            VARIANT vtProp;

            // Get the value of the Name property added with  Process Id
            hres = pclsObj->Get(L"ProcessID", 0, &vtProp, 0, 0);
            cout << "ID:"<<setw(8) << (vtProp.uiVal) << ends;
            hres = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);
            wcout << "Name : " << vtProp.bstrVal << endl;
            

            VariantClear(&vtProp);
        }

    }

    // Cleanup
    // ========

    pSvc->Release();
    pLoc->Release();
    CoUninitialize();
    getchar();
    return 0;   // Program successfully completed.
}