source: trunk/ab5.0/ablib/src/Classes/System/IO/StreamWriter.ab@ 682

/*
@file Include/Classes/System/IO/StreamWriter.ab
@brief StreamWriterの実装。
*/

Namespace System
Namespace IO

/*
@brief ストリームへの書き込みを行うTextWriterの派生。
@date 2008/03/09
@auther Egtra
*/
Class StreamWriter
    Inherits TextWriter
Public
    /*
    @date 2008/03/09
    @auther Egtra
    */
    Sub StreamWriter(path As String)
        init(New FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None), Nothing)
    End Sub

    /*
    @date 2008/03/09
    @auther Egtra
    */
    Sub StreamWriter(stream As Stream)
        init(stream, Nothing)
    End Sub

    /*
    @date 2009/02/16
    @auther Egtra
    */
    Sub StreamWriter(stream As Stream, encoding As Text.Encoding)
        init(stream, encoding)
    End Sub

    /*
    @brief 基になるストリームを取得する
    @date 2008/09/02
    @auther NoWest
    */
    Function BaseStream () As System.IO.Stream
        Return s
    End Function

    Override Sub Flush()
        Flush(False)
    End Sub

    Sub Flush(last As Boolean)
#ifdef UNICODE
        encoder.Encode(StrPtr(buf), buf.Length As SIZE_T, s, last)
        buf.Remove(0, buf.Length As SIZE_T)
#else
        Dim p = StrPtr(buf)
        Dim i = 0 As SIZE_T
        Dim mbLen = 0 As SIZE_T
        While i <= buf.Length
            mbLen = i
            'ヌル文字で終わっていないので、CharNextは使えない
            If IsDBCSLeadByte(p[i]) Then
                i += 2
            Else
                i += 1
            End If
        Wend
        Dim wcBuf As PCWSTR
        Dim wcLen = GetStr(p, mbLen, wcBuf)
        encoder.Encode(wcBuf, wcLen, s, last)
        buf.Remove(0, mbLen)
        If last Then
            If buf.Length <> 0 Then
                s.WriteByte(Asc("?"))
                buf.Length = 0  
            End If
        End If
#endif
    End Sub

Protected
    Override Sub Dispose(disposing As Boolean)
        If disposing Then
            Flush(True)
            s.Dispose()
        End If
    End Sub

Private
    Sub init(stream As Stream, e As Text.Encoding)
        s = stream
        buf = New Text.StringBuilder(4096)
        If ActiveBasic.IsNothing(e) Then
            '暫定。正式版ではUTF-8を標準とする。
            encoder = New Text.Detail.WindowsCodePageEncoder(CP_ACP)
        Else
            encoder = e.GetEncoder()
        End If
    End Sub

    encoder As Text.Encoder
    s As System.IO.Stream
End Class

End Namespace
End Namespace