CStreamReader 类 (internal class)
下面就是 mcs/class/corlib/System/CStreamReader.cs：
001: //
002: // System.CStreamReader
003: //
004: // Authors:
005: // Dietmar Maurer ([email protected])
006: // Miguel de Icaza ([email protected])
007: // Dick Porter ([email protected])
008: // Sebastien Pouliot <[email protected]>
009: //
010: // (C) Ximian, Inc. http://www.ximian.com
011: // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
012: //
013: // Permission is hereby granted, free of charge, to any person obtaining
014: // a copy of this software and associated documentation files (the
015: // "Software"), to deal in the Software without restriction, including
016: // without limitation the rights to use, copy, modify, merge, publish,
017: // distribute, sublicense, and/or sell copies of the Software, and to
018: // permit persons to whom the Software is furnished to do so, subject to
019: // the following conditions:
020: //
021: // The above copyright notice and this permission notice shall be
022: // included in all copies or substantial portions of the Software.
023: //
024: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
025: // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
026: // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
027: // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
028: // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
029: // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
030: // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
031: //
032: #if !NET_2_1
033: using System.Text;
034: using System.Runtime.InteropServices;
035:
036: namespace System.IO {
037: class CStreamReader : StreamReader {
038: TermInfoDriver driver;
039:
040: public CStreamReader(Stream stream, Encoding encoding)
041: : base (stream, encoding)
042: {
043: driver = (TermInfoDriver) ConsoleDriver.driver;
044: }
045:
046: public override int Peek ()
047: {
048: try {
049: return base.Peek ();
050: } catch (IOException) {
051: }
052:
053: return -1;
054: }
055:
056: public override int Read ()
057: {
058: try {
059: ConsoleKeyInfo key = Console.ReadKey ();
060: return key.KeyChar;
061: } catch (IOException) {
062: }
063:
064: return(-1);
065: }
066:
067: public override int Read ([In, Out] char [] dest, int index, int count)
068: {
069: if (dest == null)
070: throw new ArgumentNullException ("dest");
071: if (index < 0)
072: throw new ArgumentOutOfRangeException ("index", "< 0");
073: if (count < 0)
074: throw new ArgumentOutOfRangeException ("count", "< 0");
075: // ordered to avoid possible integer overflow
076: if (index > dest.Length - count)
077: throw new ArgumentException ("index + count > dest.Length");
078:
079: try {
080: return driver.Read (dest, index, count);
081: } catch (IOException) {
082: }
083:
084: return 0;
085: }
086:
087: public override string ReadLine ()
088: {
089: try {
090: return driver.ReadLine ();
091: } catch (IOException) {
092: }
093:
094: return null;
095: }
096:
097: public override string ReadToEnd ()
098: {
099: try {
100: return (base.ReadToEnd ());
101: } catch (IOException) {
102: }
103:
104: return null;
105: }
106: }
107: }
108: #endif
上述源程序定义了 CStreamReader 类。该类位于 System.IO 命名空间中，继承自 StreamReader 类，是 internal 的，只能在本程序集内部使用。我想 CStreamReader 这个名称应该意味着 Console Stream Reader。
第 2 行的注释“System.CStreamReader”有误，应改为“System.IO.CStreamReader”。此外，CStreamReader.cs 放在 mcs/class/corlib/System 目录下也不合理，应该放在 mcs/class/corlib/System.IO 目录下才对。
第 38 行定义了一个类型为 TermInfoDriver 的私有实例字段 driver。
第 40 行到第 44 行的公共构造函数用它的两个参数调用其基类 StreamReader 的相应构造函数，然后对 driver 字段进行赋值。
第 46 行到第 54 行以及第 97 行到第 105 行的两个公共方法重写了基类 StreamReader 对应的虚方法，并简单地调用基类的对应的虚方法，捕获并忽略 IOException 异常。
第 56 行到第 65 行的 Read 公共方法重写了基类 StreamReader 对应的虚方法，通过调用 Console 类的公共静态方法 ReadKey 来达到目的，同样捕获并忽略 IOException 异常。
第 67 行到第 95 行的两个公共方法重写了基类 StreamReader 对应的虚方法，通过私有实例字段 driver 调用 TermInfoDriver 类相应的公共实例方法来达到目的，同样捕获并忽略 IOException 异常。
在 Console.dll 项目中，CStreamReader 类在 Console.cs 中被使用。
CStreamWriter 类 (internal class)
下面就是 mcs/class/corlib/System/CStreamWriter.cs：
001: //
002: // System.CStreamWriter
003: //
004: // Authors:
005: // Dietmar Maurer ([email protected])
006: // Paolo Molaro ([email protected])
007: // Dick Porter ([email protected])
008: //
009: // (c) 2006 Novell, Inc. http://www.novell.com
010: //
011:
012: //
013: // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
014: //
015: // Permission is hereby granted, free of charge, to any person obtaining
016: // a copy of this software and associated documentation files (the
017: // "Software"), to deal in the Software without restriction, including
018: // without limitation the rights to use, copy, modify, merge, publish,
019: // distribute, sublicense, and/or sell copies of the Software, and to
020: // permit persons to whom the Software is furnished to do so, subject to
021: // the following conditions:
022: //
023: // The above copyright notice and this permission notice shall be
024: // included in all copies or substantial portions of the Software.
025: //
026: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
027: // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
028: // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
029: // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
030: // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
031: // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
032: // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
033: //
034: #if !NET_2_1
035: using System;
036: using System.Text;
037:
038: namespace System.IO {
039: class CStreamWriter : StreamWriter {
040: TermInfoDriver driver;
041:
042: public CStreamWriter (Stream stream, Encoding encoding)
043: : base (stream, encoding)
044: {
045: driver = (TermInfoDriver) ConsoleDriver.driver;
046: }
047:
048: public override void Write (char [] buffer, int index, int count)
049: {
050: if (count <= 0)
051: return;
052:
053: if (!driver.Initialized) {
054: try {
055: base.Write (buffer, index, count);
056: } catch (IOException) {
057: }
058:
059: return;
060: }
061:
062: lock (this) {
063: int last = index + count;
064: int i = index;
065: int n = 0;
066: char c;
067:
068: do {
069: c = buffer [i++];
070:
071: if (driver.IsSpecialKey (c)) {
072: // flush what we have
073: if (n > 0) {
074: try {
075: base.Write (buffer, index, n);
076: } catch (IOException) {
077: }
078:
079: n = 0;
080: }
081:
082: // write the special key
083: driver.WriteSpecialKey (c);
084:
085: index = i;
086: } else {
087: n++;
088: }
089: } while (i < last);
090:
091: if (n > 0) {
092: // write out the remainder of the buffer
093: try {
094: base.Write (buffer, index, n);
095: } catch (IOException) {
096: }
097: }
098: }
099: }
100:
101: public override void Write (char val)
102: {
103: lock (this) {
104: try {
105: if (driver.IsSpecialKey (val))
106: driver.WriteSpecialKey (val);
107: else
108: InternalWriteChar (val);
109: } catch (IOException) {
110: }
111: }
112: }
113:
114: public void WriteKey (ConsoleKeyInfo key)
115: {
116: lock (this) {
117: ConsoleKeyInfo copy = new ConsoleKeyInfo (key);
118: if (driver.IsSpecialKey (copy))
119: driver.WriteSpecialKey (copy);
120: else
121: InternalWriteChar (copy.KeyChar);
122: }
123: }
124:
125: public void InternalWriteString (string val)
126: {
127: try {
128: base.Write (val);
129: } catch (IOException) {
130: }
131: }
132:
133: public void InternalWriteChar (char val)
134: {
135: try {
136: base.Write (val);
137: } catch (IOException) {
138: }
139: }
140:
141: public void InternalWriteChars (char [] buffer, int n)
142: {
143: try {
144: base.Write (buffer, 0, n);
145: } catch (IOException) {
146: }
147: }
148:
149: public override void Write (char [] val)
150: {
151: Write (val, 0, val.Length);
152: }
153:
154: public override void Write (string val)
155: {
156: if (val == null)
157: return;
158:
159: if (driver.Initialized)
160: Write (val.ToCharArray ());
161: else {
162: try {
163: base.Write (val);
164: } catch (IOException){
165:
166: }
167: }
168: }
169: }
170: }
171: #endif
上述源程序定义了 CStreamWriter 类。该类位于 System.IO 命名空间中，继承自 StreamWriter 类，是 internal 的，只能在本程序集内部使用。我想 CStreamWriter 这个名称应该意味着 Console Stream Writer。
第 2 行的注释“System.CStreamWriter”有误，应改为“System.IO.CStreamWriter”。此外，CStreamWriter.cs 放在 mcs/class/corlib/System 目录下也不合理，应该放在 mcs/class/corlib/System.IO 目录下才对。
第 40 行定义了一个类型为 TermInfoDriver 的私有实例字段 driver。
第 42 行到第 46 行的公共构造函数用它的两个参数调用其基类 StreamWriter 的相应构造函数，然后对 driver 字段进行赋值。
第 48 到第 99 行的 Write 公共方法重写了基类 StreamWriter 对应的虚方法。如果检查到私有实例字段 driver 末初始化的话，就通过调用基类对应的虚方法来实现其功能，捕获并忽略 IOException 异常。否则的话，还通过 driver 字段对要写入的字符数组中的特殊字符进行特殊处理。
第 101 行到第 168 行的七个公共方法同样在调用基类的方法时捕获并忽略 IOException 异常。也在必要时通过 driver 字段对特殊字符进行特殊处理。
在 Console.dll 项目中，CStreamWriter 类在 Console.cs 和 TermInfoDriver.cs 中被使用。
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时间： 2024-08-29 03:06:02