創建ActiveDirectory用戶時出現IDispatch空指標例外

我正在撰寫一個 C 本機方法來創建一個 Active Directory 用戶。我得到一個空指標例外。此代碼與Microsoft 官方檔案中的代碼完全相同。

我在評論中提到了我收到錯誤的那一行：

HRESULT CreateUserFromADs(
    LPCWSTR pwszName,
    LPCWSTR pwszSAMAccountName,
    LPCWSTR pwszInitialPassword)
{
    HRESULT hr;


    CoInitialize(NULL);
    IADsContainer* pUsers = NULL;
    hr = ADsOpenObject(L"LDAP://WIN-F94H2MP3UJR.Test.local/CN=Users,DC=Test,DC=local", L"Administrator", L"Pass@12",
        ADS_SECURE_AUTHENTICATION, // For secure authentication
        IID_IADs,
        (void**)&pUsers);
    if (SUCCEEDED(hr))
    {
        IDispatch* pDisp = NULL;

        CComBSTR sbstrName = "CN=";
        sbstrName  = pwszName;

        // Create the new object in the User folder.
        hr = pUsers->Create(CComBSTR("user"), sbstrName, &pDisp);

        if (SUCCEEDED(hr))
        {
            IADsUser* padsUser = NULL;

            // Get the IADs interface.

        // Am getting null pointer exception here.
            hr = pDisp->QueryInterface(IID_IADsUser,
                (void**)&padsUser);

            if (SUCCEEDED(hr))
            {
                CComBSTR sbstrProp;
                /*
                The sAMAccountName property is required on operating system
                versions prior to Windows Server 2003.
                The Windows Server 2003 operating system will create a
                sAMAccountName value if one is not specified.
                */
                CComVariant svar;
                svar = pwszSAMAccountName;
                sbstrProp = "sAMAccountName";
                hr = padsUser->Put(sbstrProp, svar);

                /*
                Commit the new user to persistent memory.
                The user does not exist until this is called.
                */
                hr = padsUser->SetInfo();

                /*
                Set the initial password. This must be done after
                SetInfo is called because the user object must
                already exist on the server.
                */
                hr = padsUser->SetPassword(CComBSTR(pwszInitialPassword));

                /*
                Set the pwdLastSet property to zero, which forces the
                user to change the password the next time they log on.
                */
                sbstrProp = "pwdLastSet";
                svar = 0;
                hr = padsUser->Put(sbstrProp, svar);

                /*
                Enable the user account by removing the
                ADS_UF_ACCOUNTDISABLE flag from the userAccountControl
                property. Also, remove the ADS_UF_PASSWD_NOTREQD and
                ADS_UF_DONT_EXPIRE_PASSWD flags from the
                userAccountControl property.
                */
                svar.Clear();
                sbstrProp = "userAccountControl";
                hr = padsUser->Get(sbstrProp, &svar);
                if (SUCCEEDED(hr))
                {
                    svar = svar.lVal & ~(ADS_UF_ACCOUNTDISABLE |
                        ADS_UF_PASSWD_NOTREQD |
                        ADS_UF_DONT_EXPIRE_PASSWD);

                    hr = padsUser->Put(sbstrProp, svar);
                    hr = padsUser->SetInfo();
                }

                hr = padsUser->put_AccountDisabled(VARIANT_FALSE);
                hr = padsUser->SetInfo();

                padsUser->Release();
            }

            pDisp->Release();
        }

        pUsers->Release();
    }
    CoUninitialize();

    return hr;
}

錯誤資訊是

拋出例外：讀取訪問沖突。
pDisp 為 nullptr。

uj5u.com熱心網友回復：

您要求ADsOpenObject()一個IADs*介面指標，但您將它存盤在一個IADsContainer*變數中。那是型別不匹配，IADs并且IADsContainer是不相關的介面。因此，當您呼叫 時pUsers->Create()，您實際上根本沒有IADsContainer::Create()呼叫，而是實際上在呼叫IADs::SetInfo()，它沒有為 分配任何內容pDisp，這就是它保持為 NULL 的原因。

您鏈接到的 Microsoft 檔案不會犯這個錯誤，它要求ADsOpenObject()使用IADsContainer.IADs

您的IID請求必須與您收到的變數型別相匹配。因此，更改IID_IADs為IID_IADsContainer：

IADsContainer* pUsers = NULL;
hr = ADsOpenObject(...,
        IID_IADsContainer,
        (void**)&pUsers);

您應該考慮使用IID_PPV_ARGS()宏來避免再次犯此錯誤：

IADsContainer* pUsers = NULL;
hr = ADsOpenObject(...,
        IID_PPV_ARGS(&pUsers));

附帶說明，您的CreateUserFromADs()函式沒有CoInitialize()直接的業務呼叫，因此您應該洗掉該呼叫。在執行任何與 COM 相關的活動之前，呼叫執行緒負責呼叫CoInitialize/Ex()以建立其并發模型。不是由函式決定代表呼叫執行緒使用哪種并發模型。

標籤：C 视窗 服务器 活动目录 LDAP

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