mcs/class/corlib/System.IO/StreamWriter.cs

   1 //\r
   2 // System.IO.StreamWriter.cs\r
   3 //\r
   4 // Author:\r
   5 //   Dietmar Maurer (dietmar@ximian.com)\r
   6 //\r
   7 // (C) Ximian, Inc.  http://www.ximian.com\r
   8 //\r
   9 \r
  10 using System.Text;\r
  11 \r
  12 namespace System.IO {\r
  13         \r
  14                 [Serializable]\r
  15         public class StreamWriter : TextWriter {\r
  16 \r
  17                 private Encoding internalEncoding;\r
  18 \r
  19                 private Stream internalStream;\r
  20 \r
  21                 private bool iflush;\r
  22                 \r
  23                 // new public static readonly StreamWriter Null;\r
  24 \r
  25                 public StreamWriter (Stream stream)\r
  26                         : this (stream, null, 0) {}\r
  27 \r
  28                 public StreamWriter (Stream stream, Encoding encoding)\r
  29                         : this (stream, encoding, 0) {}\r
  30 \r
  31                 public StreamWriter (Stream stream, Encoding encoding, int bufferSize)\r
  32                 {\r
  33                         internalStream = stream;\r
  34 \r
  35                         if (encoding == null)\r
  36                                 internalEncoding = Encoding.UTF8;\r
  37                         else\r
  38                                 internalEncoding = encoding;\r
  39                 }\r
  40 \r
  41                 public StreamWriter (string path)\r
  42                         : this (path, false, null, 0) {}\r
  43 \r
  44                 public StreamWriter (string path, bool append)\r
  45                         : this (path, append, null, 0) {}\r
  46 \r
  47                 public StreamWriter (string path, bool append, Encoding encoding)\r
  48                         : this (path, append, encoding, 0) {}\r
  49                 \r
  50                 public StreamWriter (string path, bool append, Encoding encoding, int bufferSize)\r
  51                 {\r
  52                         FileMode mode;\r
  53 \r
  54                         if (append)\r
  55                                 mode = FileMode.Append;\r
  56                         else\r
  57                                 mode = FileMode.Create;\r
  58                         \r
  59                         internalStream = new FileStream (path, mode, FileAccess.Write);\r
  60 \r
  61                         if (append)\r
  62                                 internalStream.Position = internalStream.Length;\r
  63                         else\r
  64                                 internalStream.SetLength (0);\r
  65 \r
  66                         if (encoding == null)\r
  67                                 internalEncoding = Encoding.UTF8;\r
  68                         else\r
  69                                 internalEncoding = encoding;\r
  70                         \r
  71                 }\r
  72 \r
  73                 public virtual bool AutoFlush\r
  74                 {\r
  75 \r
  76                         get {\r
  77                                 return iflush;\r
  78                         }\r
  79 \r
  80                         set {\r
  81                                 iflush = value;\r
  82                         }\r
  83                 }\r
  84 \r
  85                 public virtual Stream BaseStream\r
  86                 {\r
  87                         get {\r
  88                                 return internalStream;\r
  89                         }\r
  90                 }\r
  91 \r
  92                 public override Encoding Encoding\r
  93                 {\r
  94                         get {\r
  95                                 return internalEncoding;\r
  96                         }\r
  97                 }\r
  98 \r
  99                 protected override void Dispose (bool disposing)\r
 100                 {\r
 101                         if (disposing && internalStream != null) {\r
 102                                 internalStream.Close ();\r
 103                                 internalStream = null;\r
 104                         }\r
 105                 }\r
 106 \r
 107                 public override void Flush ()\r
 108                 {\r
 109                         internalStream.Flush ();\r
 110                 }\r
 111                 \r
 112                 public override void Write (char[] buffer, int index, int count)\r
 113                 {\r
 114                         byte[] res = new byte [internalEncoding.GetMaxByteCount (buffer.Length)];\r
 115                         int len;\r
 116 \r
 117                         len = internalEncoding.GetBytes (buffer, index, count, res, 0);\r
 118 \r
 119                         internalStream.Write (res, 0, len);\r
 120 \r
 121                         if (iflush)\r
 122                                 Flush ();\r
 123                         \r
 124                 }\r
 125 \r
 126                 public override void Write(string value)\r
 127                 {\r
 128                         Write (value.ToCharArray (), 0, value.Length);\r
 129                 }\r
 130 \r
 131                          \r
 132         }\r
 133 }\r
 134                         \r
 135                         \r