Contoh Kode untuk Mendeteksi Tabrakan Penamaan Skema

Topik ini mencakup contoh kode yang mendeteksi tabrakan penamaan skema.

Contoh kode C/C++ berikut mengkueri skema untuk atribut penamaan kunci pada classSchema atau atributSkema objek.

Ini mengembalikan TRUE jika atribut atau kelas yang bertentangan ditemukan. Ini mengembalikan FALSE jika atribut atau kelas dengan cnyang ditentukan , lDAPDisplayName, OID , skemaIDGUID, atau linkID tidak bertentangan dengan skema dan, oleh karena itu, aman untuk ditambahkan ke skema.

/********************************************************************

    FindCollidingAttributesOrClasses()

********************************************************************/

HRESULT FindCollidingAttributesOrClasses(
    IDirectorySearch *pSchemaNC, // IDirectorySearch pointer to 
                                 // schema naming context.
    LPWSTR szName,
    LPWSTR szLDAPDisplayName,
    LPWSTR szOID,
    const GUID * pSchemaIDGUID,
    DWORD dwLinkID, // Value is zero (0) if the attribute is not linked,
                    // or if checking for class.
    BOOL *pfIsColliding)
{
    if (!pSchemaNC || 
        !szName ||
        !szLDAPDisplayName || 
        !szOID || 
        !pSchemaIDGUID)
    {
        return E_POINTER;
    }
 
    HRESULT hr = E_FAIL;
        
    LPWSTR szBuffer = NULL;
        
    hr = ADsEncodeBinaryData((LPBYTE)pSchemaIDGUID, 
                             sizeof(GUID), 
                             &szBuffer);
    if (SUCCEEDED(hr))
    {
        LPWSTR pwszFormatLinkID = L"(|(cn=%s)(lDAPDisplayName=%s)(attributeID=%s)(governsID=%s)(schemaIDGUID=%s)(linkID=%d))";
        LPWSTR pwszFormatNoLinkID = L"(|(cn=%s)(lDAPDisplayName=%s)(attributeID=%s)(governsID=%s)(schemaIDGUID=%s))";
        LPWSTR szFilter = new WCHAR[lstrlenW(pwszFormatLinkID) + 
                                    lstrlenW(szName) + 
                                    lstrlenW(szLDAPDisplayName) + 
                                    lstrlenW(szOID) + 
                                    lstrlenW(szOID) +
                                    lstrlenW(szBuffer) +
                                    20 +
                                    1];

        if(szFilter)
        {
            if (dwLinkID > 0L)
            {
                swprintf_s(szFilter,
                    pwszFormatLinkID,
                    szName,
                    szLDAPDisplayName,
                    szOID,
                    szOID,
                    szBuffer,
                    dwLinkID);
            }
            else
            {
                swprintf_s(szFilter,
                    pwszFormatNoLinkID,
                    szName,
                    szLDAPDisplayName,
                    szOID,
                    szOID,
                    szBuffer);
            }
            
            // Attributes are one-level deep in the Schema 
            // container so only search one level.
            ADS_SEARCHPREF_INFO SearchPrefs[2];
            SearchPrefs[0].dwSearchPref = ADS_SEARCHPREF_SEARCH_SCOPE;
            SearchPrefs[0].vValue.dwType = ADSTYPE_INTEGER;
            SearchPrefs[0].vValue.Integer = ADS_SCOPE_ONELEVEL;

            SearchPrefs[1].dwSearchPref = ADS_SEARCHPREF_PAGESIZE;
            SearchPrefs[1].vValue.dwType = ADSTYPE_INTEGER;
            SearchPrefs[1].vValue.Integer = 1000;
            
            int iCount = 0;
            
            // Set the search preference
            hr = pSchemaNC->SetSearchPreference(
                   SearchPrefs, 
                   sizeof(SearchPrefs)/sizeof(ADS_SEARCHPREF_INFO)
                 );
            if (SUCCEEDED(hr))
            {
                LPWSTR pszAttribs[] = {
                    L"lDAPDisplayName", 
                    L"cn", 
                    L"attributeID", 
                    L"governsID", 
                    L"schemaIDGUID", 
                    L"linkID", 
                    L"objectCategory"
                };

                // Handle used for searching
                ADS_SEARCH_HANDLE hSearch = NULL;
                DWORD x = 0L;
                
                hr = pSchemaNC->ExecuteSearch(szFilter,
                                pszAttribs,
                                sizeof(pszAttribs)/sizeof(LPWSTR),
                                &hSearch);
                if (SUCCEEDED(hr))
                {
                    // Call IDirectorySearch::GetNextRow() 
                    // to retrieve the next row  of data.
                    hr = pSchemaNC->GetFirstRow(hSearch);
                    while (hr != S_ADS_NOMORE_ROWS)
                    {
                        // Keep track of count.
                        iCount++;

                        // Get the next row
                        hr = pSchemaNC->GetNextRow(hSearch);
                    }
            
                    // Close the search handle to cleanup
                    pSchemaNC->CloseSearchHandle(hSearch);

                    if(SUCCEEDED(hr))
                    {
                        if (0 == iCount)
                        {
                            *pfIsColliding = FALSE;
                        }
                        else
                        {
                            *pfIsColliding = TRUE;
                        }

                        hr = S_OK;
                    }
                }
            }

            delete szFilter;
        }
            
        FreeADsMem(szBuffer);
    }
    
    return hr;
}