c++代码调用WMI 得到机器Model name.

最新推荐文章于 2021-08-21 18:17:25 发布

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#c++ #null #initialization #instantiation #service #security

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本文提供了一个使用Windows Management Instrumentation (WMI)的示例代码，该代码演示了如何通过WMI查询计算机系统的Model属性。

以下samle code 是使用WMI的一个例子，可以得到Model.如果要得到BIOS的其它内容，可以改换参数。

#include <windows.h>
#include <objbase.h>
#include <atlbase.h>
#include <iostream>
#include <wbemidl.h>
#include <comutil.h>
#pragma comment(lib, "comsuppw.lib")

int main( int argc, TCHAR** argv )
{
    int result = 0;
HRESULT hr = CoInitializeEx( NULL, COINIT_MULTITHREADED );
if ( FAILED( hr ) )
{
  std::cerr << "COM initialization failed" << std::endl;
  return -1;
}

// setup process-wide security context
hr = CoInitializeSecurity( NULL, // we're not a server
          -1, // we're not a server
          NULL, // dito
          NULL, // reserved
          RPC_C_AUTHN_LEVEL_DEFAULT, // let DCOM decide
          RPC_C_IMP_LEVEL_IMPERSONATE,
          NULL,
          EOAC_NONE,
          NULL );
if ( FAILED( hr ) )
{
  std::cerr << "Security initialization failed" << std::endl;
  return -1;
}

// we're going to use CComPtr<>s, whose lifetime must end BEFORE CoUnitialize is called
{
  // connect to WMI
  CComPtr< IWbemLocator > locator;
  hr = CoCreateInstance( CLSID_WbemAdministrativeLocator, NULL,
       CLSCTX_INPROC_SERVER,
       IID_IWbemLocator, reinterpret_cast< void** >( &locator ) );
  if ( FAILED( hr ) )
  {
   std::cerr << "Instantiation of IWbemLocator failed" << std::endl;
   return -1;
  }

  // connect to local service with current credentials
  CComPtr< IWbemServices > service;
  hr = locator->ConnectServer( L"root\\cimv2", NULL, NULL, NULL,
          WBEM_FLAG_CONNECT_USE_MAX_WAIT,
          NULL, NULL, &service );
if ( SUCCEEDED( hr ) )
  {
     CComPtr< IEnumWbemClassObject > enumerator;
   hr = service->ExecQuery( L"WQL", L"SELECT * FROM Win32_computersystem",
             WBEM_FLAG_FORWARD_ONLY, NULL, &enumerator );

   if ( SUCCEEDED( hr ) )
   {
    CComPtr< IWbemClassObject > ptrInfo = NULL;
    ULONG retcnt;
    hr = enumerator->Next( WBEM_INFINITE, 1L, reinterpret_cast<IWbemClassObject**>( &ptrInfo ), &retcnt );
    if ( SUCCEEDED( hr ) )
    {
     if ( retcnt > 0 )
     {

          _variant_t var_val;
             hr = ptrInfo->Get( L"Model", 0, &var_val, NULL, NULL );
              if ( SUCCEEDED( hr ) )
      {
       _bstr_t str = var_val;


       std::cout << str << std::endl;
      }
      else
      {
       std::cerr << "IWbemClassObject::Get failed" << std::endl;
       result = -1;
      }
     }
     else
     {
      std::cout << "Enumeration empty" << std::endl;
     }
    }
    else
    {
     std::cerr << "Error in iterating through enumeration" << std::cerr;
     result = -1;
    }

   }
   else
   {
    std::cerr << "Query failed" << std::endl;
    result = -1;
   }
  }
  else
  {
   std::cerr << "Couldn't connect to service" << std::endl;
   result = -1;
  }

}
CoUninitialize();

return result;
}