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IsolatedStorageFileStream.Handle プロパティ

  • [アーティクル]

現在の IsolatedStorageFileStream オブジェクトによってカプセル化されるファイルのファイル ハンドルを取得します。 IsolatedStorageFileStream ではこのプロパティへのアクセスは許可されておらず、 IsolatedStorageException がスローされます。

Overrides Public ReadOnly Property Handle As IntPtr
[C#]
public override IntPtr Handle {get;}
[C++]
public: __property IntPtr get_Handle();
[JScript]
public override function get Handle() : IntPtr;

プロパティ値

現在の IsolatedStorageFileStream オブジェクトによってカプセル化されるファイルのファイル ハンドル。

例外

例外の種類 条件
IsolatedStorageException プロパティがアクセスされました。

解説

詳細については、「 Handle 」を参照してください。

使用例

[Visual Basic, C#, C++] Handle プロパティのコード例を次に示します。

 
Private Function GetPrefsForUser() As Boolean
    Try
        ' Retrieve an IsolatedStorageFile for the current Domain and Assembly.
        Dim isoFile As IsolatedStorageFile = _
            IsolatedStorageFile.GetStore(IsolatedStorageScope.User _
            Or IsolatedStorageScope.Assembly _
            Or IsolatedStorageScope.Domain, Nothing, Nothing)

        Dim isoStream As New IsolatedStorageFileStream(Me.userName, FileMode.Open, _
            FileAccess.Read, FileShare.Read)
        ' farThe code executes to this point only if a file corresponding to the username exists.
        ' Though you can perform operations on the stream, you cannot get a handle to the file.
        Try

            Dim aFileHandle As IntPtr = isoStream.Handle
            Console.WriteLine(("A pointer to a file handle has been obtained. " & aFileHandle.ToString() & " " & aFileHandle.GetHashCode()))

        Catch ex As Exception
            ' Handle the exception.
            Console.WriteLine("Expected exception")
            Console.WriteLine(ex.ToString())
        End Try

        Dim reader As New StreamReader(isoStream)
        ' Read the data.
        Me.NewsUrl = reader.ReadLine()
        Me.SportsUrl = reader.ReadLine()
        reader.Close()
        isoFile.Close()
        Return False
    Catch ex As System.IO.FileNotFoundException
        ' Expected exception if a file cannot be found. This indicates that we have a new user.
        Return True
    End Try
End Function 'GetPrefsForUser


[C#] 
private bool GetPrefsForUser()
{
    try 
    {

        // Retrieve an IsolatedStorageFile for the current Domain and Assembly.
        IsolatedStorageFile isoFile =
            IsolatedStorageFile.GetStore(IsolatedStorageScope.User |
            IsolatedStorageScope.Assembly |
            IsolatedStorageScope.Domain ,
            null,
            null);

        IsolatedStorageFileStream isoStream =
            new IsolatedStorageFileStream( this.userName,
            FileMode.Open,
            FileAccess.Read,
            FileShare.Read);  

        // The code executes to this point only if a file corresponding to the username exists.
        // Though you can perform operations on the stream, you cannot get a handle to the file.

        try
        {

            IntPtr aFileHandle = isoStream.Handle;
            Console.WriteLine("A pointer to a file handle has been obtained. "
                + aFileHandle.ToString() + " "
                + aFileHandle.GetHashCode());
        }

        catch (Exception e) 
        {
            // Handle the exception.
            Console.WriteLine("Expected exception");
            Console.WriteLine(e);
        }

        StreamReader reader = new StreamReader(isoStream);
        // Read the data.
        this.NewsUrl = reader.ReadLine();
        this.SportsUrl = reader.ReadLine();
        reader.Close();
        isoFile.Close();
        return false;
    }
    catch (System.IO.FileNotFoundException) 
    {
        // Expected exception if a file cannot be found. This indicates that we have a new user.
        return true;
    }
}

[C++] 
bool GetPrefsForUser()
{
   try 
   {
      // Retrieve an IsolatedStorageFile for the current Domain and Assembly.
      IsolatedStorageFile* isoFile =
         IsolatedStorageFile::GetStore(
         static_cast<IsolatedStorageScope>(IsolatedStorageScope::User | 
         IsolatedStorageScope::Assembly |
         IsolatedStorageScope::Domain),
         (Type*)0, 0);
      IsolatedStorageFileStream* isoStream = new IsolatedStorageFileStream(this->userName,
         FileMode::Open,  
         FileAccess::ReadWrite,
         isoFile);
      // farThe code executes to this point only if a file corresponding to the username exists.
      // Though you can perform operations on the stream, you cannot get a handle to the file.
      try
      {

         IntPtr aFileHandle = isoStream->Handle;
         Console::WriteLine(S"A pointer to a file handle has been obtained. {0} {1}",
            __box(aFileHandle), __box(aFileHandle.GetHashCode()));
      }

      catch (Exception* e) 
      {
         // Handle the exception.
         Console::WriteLine(S"Expected exception");
         Console::WriteLine(e->ToString());
      }

      StreamReader* reader = new StreamReader(isoStream);
      // Read the data.
      this->NewsUrl = reader->ReadLine();
      this->SportsUrl = reader->ReadLine();
      reader->Close();
      isoFile->Close();
      isoStream->Close();
      return false;
   }
   catch (Exception* e) 
   {
      // Expected exception if a file cannot be found. This indicates that we have a new user.
      String* errorMessage = e->ToString();
      return true;
   }
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン 言語のフィルタ をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

.NET Framework セキュリティ:

参照

IsolatedStorageFileStream クラス | IsolatedStorageFileStream メンバ | System.IO.IsolatedStorage 名前空間