C++调用WMI类查询获取操作系统名（实例）

#define _WIN32_DCOM
#include <iostream>
#include <comdef.h>
#include <Wbemidl.h>

using namespace std;

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

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

    // 第一步：初始化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.
    }

    // 第二步：设置COM安全级别
    hres = CoInitializeSecurity(
        NULL,
        -1,                          // COM 认证
        NULL,                        // 服务认证
        NULL,                        // 保留NULL
        RPC_C_AUTHN_LEVEL_DEFAULT,   // 默认权限
        RPC_C_IMP_LEVEL_IMPERSONATE, // 默认模拟
        NULL,                        // 认证信息
        EOAC_NONE,                   // Additional capabilities
        NULL                         // Reserved
        );


    if (FAILED(hres))
    {
        cout << "安全级别初始化失败，错误代码 = 0x" << hex << hres << endl;
        CoUninitialize();
        return 1;                    // Program has failed.
    }

    // 第三步：获取初始化本地WMI
    IWbemLocator *pLoc = NULL;

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

    if (FAILED(hres))
    {
        cout << "创建IWbemLocator对象失败，错误代码 = 0x" << hex << hres << endl;
        CoUninitialize();
        return 1;                 // Program has failed.
    }

    // 第四步：通过 IWbemLocator::ConnectServer 方法连接WMI
    IWbemServices *pSvc = NULL;

    // 使用IWbemServices 连接 root\cimv2 命名空间
    hres = pLoc->ConnectServer(
        _bstr_t(L"ROOT\\CIMV2"), // 对象路径
        NULL,                    // 用户名为空默认当前用户
        NULL,                    // 用户密码为空默认当前密码
        0,                       // 本地，NULL表示当前
        NULL,                    // 安全标志
        0,                       // 授权人
        0,                       // 上下文对象
        &pSvc                    // IWbemServices代理指针
        );

    if (FAILED(hres))
    {
        cout << "无法连接，错误代码 = 0x" << hex << hres << endl;
        pLoc->Release();
        CoUninitialize();
        return 1;                // Program has failed.
    }

    cout << "已连接到 ROOT\\CIMV2 WMI 命名空间" << endl;


    // 第五步：设置代理安全级别

    hres = CoSetProxyBlanket(
        pSvc,                        // 要设置的代理指针
        RPC_C_AUTHN_WINNT,           // RPC_C_AUTHN_xxx
        RPC_C_AUTHZ_NONE,            // RPC_C_AUTHZ_xxx
        NULL,                        // 委托服务名
        RPC_C_AUTHN_LEVEL_CALL,      // RPC_C_AUTHN_LEVEL_xxx
        RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
        NULL,                        // 客户端身份
        EOAC_NONE                    // 代理能力
        );

    if (FAILED(hres))
    {
        cout << "代理设置失败，错误代码 = 0x" << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;               // Program has failed.
    }

    // 第六步：使用 IWbemServices 指针获取系统名
    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))
    {
        cout << "查询系统名失败，错误代码 = 0x" << hex << hres << endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;               // Program has failed.
    }

    // 第七步：获取查询数据
    IWbemClassObject *pclsObj = NULL;
    ULONG uReturn = 0;

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

        if (0 == uReturn)
        {
            break;
        }

        VARIANT vtProp;

        // 获取Name属性值
        hr = pclsObj->Get(L"Name", 0, &vtProp, 0, 0);
        wcout << " 系统名 : " << vtProp.bstrVal << endl;
        VariantClear(&vtProp);

        pclsObj->Release();
    }

    // 清理工作
    pSvc->Release();
    pLoc->Release();
    pEnumerator->Release();
    CoUninitialize();
    system("pause");
    return 0;   // Program successfully completed.

}

说明都在源码注释里，效果图：