C++调用WMI类查询获取操作系统名

 #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(, COINIT_MULTITHREADED);
     if (FAILED(hres))
     {
         cout << "Failed to initialize COM library. Error code = 0x"
             << hex << hres << endl;
         return ;                  // Program has failed.
     }

     // 第二步：设置COM安全级别
     hres = CoInitializeSecurity(
         NULL,
         -,                          // 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 ;                    // Program has failed.
     }

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

     hres = CoCreateInstance(CLSID_WbemLocator, , 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 ;                 // 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
         ,                       // 本地，NULL表示当前
         NULL,                    // 安全标志
         ,                       // 授权人
         ,                       // 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 ;                // 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 ;               // 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 ;               // Program has failed.
     }

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

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

         if ( == uReturn)
         {
             break;
         }

         VARIANT vtProp;

         // 获取Name属性值
         hr = pclsObj->Get(L"Name", , &vtProp, , );
         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 ;   // Program successfully completed.

 }

说明都在源码注释里，效果图：