Document比較

public class EngineLoader : IDisposable
{
    public EngineLoader()
    {
        // これらの変数を、FREngine.dll へのフルパス、Customer Project ID、
        // および該当する場合は Online License トークンファイルへのパスと Online License パスワードで初期化します
        string enginePath = "";
        string customerProjectId = "";
        string licensePath = "";
        string licensePassword = "";
        // FREngine.dll ライブラリを読み込みます
        dllHandle = LoadLibraryEx(enginePath, IntPtr.Zero, LOAD_WITH_ALTERED_SEARCH_PATH);
           
        try
        {
            if (dllHandle == IntPtr.Zero)
            {
                throw new Exception("Can't load " + enginePath);
            }
            IntPtr initializeEnginePtr = GetProcAddress(dllHandle, "InitializeEngine");
            if (initializeEnginePtr == IntPtr.Zero)
            {
                throw new Exception("Can't find InitializeEngine function");
            }
            IntPtr deinitializeEnginePtr = GetProcAddress(dllHandle, "DeinitializeEngine");
            if (deinitializeEnginePtr == IntPtr.Zero)
            {
                throw new Exception("Can't find DeinitializeEngine function");
            }
            IntPtr dllCanUnloadNowPtr = GetProcAddress(dllHandle, "DllCanUnloadNow");
            if (dllCanUnloadNowPtr == IntPtr.Zero)
            {
                throw new Exception("Can't find DllCanUnloadNow function");
            }
            // ポインターをデリゲートに変換します
            initializeEngine = (InitializeEngine)Marshal.GetDelegateForFunctionPointer(
                initializeEnginePtr, typeof(InitializeEngine));
            deinitializeEngine = (DeinitializeEngine)Marshal.GetDelegateForFunctionPointer(
                deinitializeEnginePtr, typeof(DeinitializeEngine));
            dllCanUnloadNow = (DllCanUnloadNow)Marshal.GetDelegateForFunctionPointer(
                dllCanUnloadNowPtr, typeof(DllCanUnloadNow));
            // InitializeEngine 関数を呼び出し、 
            // Online License ファイルへのパスと Online License パスワードを渡します
            int hresult = initializeEngine(customerProjectId, licensePath, licensePassword, 
                "", "", false, ref engine);
            Marshal.ThrowExceptionForHR(hresult);
        }
        catch (Exception)
        {
            // FREngine.dll ライブラリを解放します
            engine = null;
            // FreeLibrary の呼び出し前にすべてのオブジェクトを削除します
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();
            FreeLibrary(dllHandle);
            dllHandle = IntPtr.Zero;
            initializeEngine = null;
            deinitializeEngine = null;
            dllCanUnloadNow = null;
            throw;
        }
    }
    // Kernel32.dll 関数
    [DllImport("kernel32.dll")]
    private static extern IntPtr LoadLibraryEx(string dllToLoad, IntPtr reserved, uint flags);
    private const uint LOAD_WITH_ALTERED_SEARCH_PATH = 0x00000008;
    [DllImport("kernel32.dll")]
    private static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
    [DllImport("kernel32.dll")]
    private static extern bool FreeLibrary(IntPtr hModule);
    // FREngine.dll 関数
    [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode)]
    private delegate int InitializeEngine(string customerProjectId, string licensePath, 
        string licensePassword, string tempFolder, string dataFolder, bool isSharedCPUCoresMode, 
        ref FREngine.IEngine engine);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DeinitializeEngine();
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DllCanUnloadNow();
    // private 変数
    private FREngine.IEngine engine = null;
    // FREngine.dll へのハンドル
    private IntPtr dllHandle = IntPtr.Zero;
    private InitializeEngine initializeEngine = null;
    private DeinitializeEngine deinitializeEngine = null;
    private DllCanUnloadNow dllCanUnloadNow = null;
}

// 画像ファイルから FRDocument オブジェクトを作成
FREngine.IFRDocument frDocument = engine.CreateFRDocumentFromImage( "C:\\MyImage.tif", null );

// 既定のパラメーターで文書を処理
// 必要に応じて変更できます。たとえば、事前にプロファイルを読み込めます
frDocument.Process( null );

// 文書の比較を実行します 
FREngine.IComparator comparator = engine.CreateComparator();
FREngine.IComparisonResult comparatorResult = 
    comparator.CompareDocuments( referenceFRDocument, userFRDocument, null, null );

// 検出された変更と元の文書内でのその位置に関する情報を取得します
FREngine.IChanges changes = comparatorResult.Changes;
foreach( FREngine.IChange change in changes ) {
      FREngine.ModificationTypeEnum modificationType = change.ModificationType;
      FREngine.IChangeLocation referenceLocation = change.ReferenceLocation;
      // これで、担当者が確認できるようにページ上でこれらの変更を強調表示できます
      ... 
}

// XML 形式で保存します
comparisonResult.Export( "C:\\ComparisonResult.xml", FREngine.ComparatorExportFormatEnum.CEF_Xml, null );

public class EngineLoader : IDisposable
{
    // FineReader Engine をアンロードする
    public void Dispose()
    {
        if (engine == null)
        {
            // Engine はロードされていない
            return;
        }
        engine = null;
        // FreeLibrary を呼び出す前にすべてのオブジェクトを削除する
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
        int hresult = deinitializeEngine();
 
        hresult = dllCanUnloadNow();
        if (hresult == 0)
        {
            FreeLibrary(dllHandle);
        }
        dllHandle = IntPtr.Zero;
        initializeEngine = null;
        deinitializeEngine = null;
        dllCanUnloadNow = null;
        // クリーンアップ後に例外をスローする
        Marshal.ThrowExceptionForHR(hresult);
    }
    // Kernel32.dll の関数
    [DllImport("kernel32.dll")]
    private static extern IntPtr LoadLibraryEx(string dllToLoad, IntPtr reserved, uint flags);
    private const uint LOAD_WITH_ALTERED_SEARCH_PATH = 0x00000008;
    [DllImport("kernel32.dll")]
    private static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
    [DllImport("kernel32.dll")]
    private static extern bool FreeLibrary(IntPtr hModule);
    // FREngine.dll の関数
    [UnmanagedFunctionPointer(CallingConvention.StdCall, CharSet = CharSet.Unicode)]
    private delegate int InitializeEngine( string customerProjectId, string LicensePath, string LicensePassword, , , , ref FREngine.IEngine engine);
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DeinitializeEngine();
    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    private delegate int DllCanUnloadNow();
    // プライベート変数
    private FREngine.IEngine engine = null;
    // FREngine.dll へのハンドル
    private IntPtr dllHandle = IntPtr.Zero;
    private InitializeEngine initializeEngine = null;
    private DeinitializeEngine deinitializeEngine = null;
    private DllCanUnloadNow dllCanUnloadNow = null;
}