Exempelkod för uppdatering av schemacachen

Följande C/C++-funktioner hämtar DNS-namnet på schemahanteraren (GetSchemaMasterDNSName) och uppdaterar schemacachen i schemahanteraren (UpdateSchemaMasterCache). Om du vill använda dessa funktioner anropar du GetSchemaMasterDNSName för att hämta schemahanterarens DNS-namn, skickar schemahanterarens DNS-namn till UpdateSchemaMasterCache, anropar CoTaskMemFree på strängen som innehåller schemats HUVUD-DNS-namn.

Mer information finns i Uppdatera schemacachen.

HRESULT UpdateSchemaMasterCache(LPOLESTR szSchemaMasterDNSName)
{
if (!szSchemaMasterDNSName)
   return E_POINTER;
HRESULT hr = E_FAIL;
IADs *pObject = NULL;
VARIANT var;
LPOLESTR szPath = new OLECHAR[MAX_PATH];
wcscpy_s(szPath,L"LDAP://");
wcscat_s(szPath,szSchemaMasterDNSName);
wcscat_s(szPath,L"/rootDSE");
hr = ADsOpenObject(szPath,
         NULL,
         NULL,
         ADS_SECURE_AUTHENTICATION, // Use Secure Authentication.
         IID_IADs,
         (void**)&pObject);
if (SUCCEEDED(hr))
{
  VariantInit(&var);
  var.vt = VT_I4;
  var.lVal = 1L;
  hr = pObject->Put(CComBSTR("schemaUpdateNow"), var);
  if (SUCCEEDED(hr))
  {
    hr = pObject->SetInfo();
    if (SUCCEEDED(hr))
      MessageBox(NULL,L"Updated",L"Extend Schema Wizard",MB_OK|MB_ICONEXCLAMATION);
    else
      MessageBox(NULL,L"Update Failed",L"Extend Schema Wizard",MB_OK|MB_ICONEXCLAMATION);
  }
}
if (pObject)
  pObject->Release();
 
return hr;
}
 
HRESULT GetSchemaMasterDNSName(LPOLESTR *pszSchemaMasterDNSName)
{
if (!pszSchemaMasterDNSName)
   return E_POINTER;
HRESULT hr = E_FAIL;
IADs *pObject = NULL;
IADs *pTempSchema = NULL;
IADs *pNTDS = NULL;
IADs *pServer = NULL;
BSTR bstrParent;
LPOLESTR szPath = new OLECHAR[MAX_PATH];
VARIANT var, varRole,varComputer;
hr = ADsOpenObject(L"LDAP://rootDSE",
         NULL,
         NULL,
         ADS_SECURE_AUTHENTICATION, // Use Secure Authentication.
         IID_IADs,
         (void**)&pObject);
if (SUCCEEDED(hr))
{
  hr = pObject->Get(CComBSTR("schemaNamingContext"), &var);
  if (SUCCEEDED(hr))
  {
    wcscpy_s(szPath,L"LDAP://");
    wcscat_s(szPath,var.bstrVal);
    hr = ADsOpenObject(szPath,
             NULL,
             NULL,
             ADS_SECURE_AUTHENTICATION, // Use Secure Authentication.
             IID_IADs,
             (void**)&pTempSchema);
 
    if (SUCCEEDED(hr))
    {
      // Read the fsmoRoleOwner attribute to see which server is the schema master.
      hr = pTempSchema->Get(CComBSTR("fsmoRoleOwner"), &varRole);
      if (SUCCEEDED(hr))
      {
        // fsmoRoleOwner attribute returns the nTDSDSA object.
        // The parent is the server object.
        // Bind to NTDSDSA object and get the parent object.
        wcscpy_s(szPath,L"LDAP://");
        wcscat_s(szPath,varRole.bstrVal);
        hr = ADsOpenObject(szPath,
             NULL,
             NULL,
             ADS_SECURE_AUTHENTICATION, // Use Secure Authentication.
             IID_IADs,
             (void**)&pNTDS);
        if (SUCCEEDED(hr))
        {
          hr = pNTDS->get_Parent(&bstrParent);
          if (SUCCEEDED(hr))
          {
            // Bind to server object
            // and get the reference to the computer object.
            wcscpy_s(szPath,bstrParent);
            hr = ADsOpenObject(szPath,
               NULL,
               NULL,
               ADS_SECURE_AUTHENTICATION, // Use Secure Authentication.
               IID_IADs,
               (void**)&pServer);
            if (SUCCEEDED(hr))
            {
              // Get the dns name of the server.
              hr = pServer->Get(CCOmBSTR("dNSHostName"), &varComputer);
              if (SUCCEEDED(hr))
              {
                *pszSchemaMasterDNSName = (OLECHAR *)CoTaskMemAlloc (sizeof(OLECHAR)*(wcslen(varComputer.bstrVal)+1));
                if (*pszSchemaMasterDNSName)
                {
                  wcscpy_s(*pszSchemaMasterDNSName, varComputer.bstrVal);
                }
                else
                {
                  hr = E_OUTOFMEMORY;
                }
              }
              VariantClear(&varComputer);
            }
            if (pServer)
              pServer->Release();
          }
          SysFreeString(bstrParent);
        }
        if (pNTDS)
          pNTDS->Release();
      }
      VariantClear(&varRole);
    }
    if (pTempSchema)
      pTempSchema->Release();
  }
  VariantClear(&var);
}
if (pObject)
    pObject->Release();
 
return hr;
}