StringStream in C

Question

I want to be able to build a string from a class that I create that derives from Stream  Specifically  I want to be able to write code like this   void Print Stream stream           Some code that operates on a Stream     void Main         StringStream stream   new StringStream        Print stream       string myString   stream GetResult        Can I create a class called StringStream that makes this possible  Or is such a class already available   Update  In my example  the method Print is provided in a third-party external DLL  As you can see  the argument that Print expects is a Stream  After printing to the Stream  I want to be able to retrieve its content as a string

User · Answer

You can create a MemoryStream from a String and use that in any third-party function that requires a stream  In this case  MemoryStream  with the help of UTF8 GetBytes  provides the functionality of Java s StringStream   From String examples  String content    stuff   using  MemoryStream stream   new MemoryStream System Text Encoding UTF8 GetBytes content          Print stream     or whatever action you need to perform with the stream     stream Seek 0  SeekOrigin Begin     If you need to use the same stream again  don t forget to reset it      UseAgain stream       To String example  stream Seek 0  SeekOrigin Begin   string s  using  var readr   new StreamReader stream         s   readr ReadToEnd        and don t forget to dispose the stream if you created it

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You can use a StringWriter to write values to a string   It provides a stream-like syntax  though does not derive from Stream  which works with an underlying StringBuilder

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Since your Print   method presumably deals with Text data  could you rewrite it to accept a TextWriter parameter   The library provides a StringWriter  TextWriter but not a StringStream   I suppose you could create one by wrapping a MemoryStream  but is it really necessary     After the Update   void Main        string myString      outside using    using  MemoryStream stream   new MemoryStream              Print stream        myString   Encoding UTF8 GetString stream ToArray                     You may want to change UTF8 to ASCII  depending on the encoding used by Print

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You can use tandem of MemoryStream and StreamReader classes   void Main         string myString       using  var stream   new MemoryStream                  Print stream            stream Position   0          using  var reader   new StreamReader stream                         myString   reader ReadToEnd

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You have a number of options   One is to not use streams  but use the TextWriter     void Print TextWriter writer                 void Main            var textWriter   new StringWriter        Print writer       string myString   textWriter ToString           It s likely that TextWriter is the appropriate level of abstraction for your print function  Streams are aimed at writing binary data  while TextWriter works at a higher abstraction level  specifically geared towards outputting strings   If your motivation is that you also want your Print function to write to files  you can get a text writer from a filestream as well   void Print TextWriter writer        void PrintToFile string filePath          using var textWriter   new StreamWriter filePath                   Print writer              If you REALLY want a stream you can look at MemoryStream

User · Answer

I see a lot of good answers here  but none that directly address the lack of a StringStream class in C    So I have written one of my own     public class StringStream   Stream       private readonly MemoryStream  memory      public StringStream string text                 memory   new MemoryStream Encoding UTF8 GetBytes text              public StringStream                  memory   new MemoryStream              public StringStream int capacity                 memory   new MemoryStream capacity             public override void Flush                  memory Flush              public override int Read byte   buffer  int offset  int count                return   memory Read buffer  offset  count             public override long Seek long offset  SeekOrigin origin                return  memory Seek offset  origin             public override void SetLength long value                 memory SetLength value             public override void Write byte   buffer  int offset  int count                 memory Write buffer  offset  count           return            public override bool CanRead   gt   memory CanRead      public override bool CanSeek   gt   memory CanSeek      public override bool CanWrite   gt   memory CanWrite      public override long Length   gt    memory Length      public override long Position               get   gt   memory Position          set   gt   memory Position   value            public override string ToString                 return System Text Encoding UTF8 GetString  memory GetBuffer    0   int   memory Length             public override int ReadByte                 return  memory ReadByte              public override void WriteByte byte value                 memory WriteByte value             An example of its use             string s0                Lorem ipsum dolor sit amet  consectetur adipiscing elit  sed do eiusmod tempor r n                 incididunt ut labore et dolore magna aliqua  Ut enim ad minim veniam  quis nostrud r n                 exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat  Duis aute irure dolor r n                 in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur  Excepteur sint r n                 occaecat cupidatat non proident  sunt in culpa qui officia deserunt mollit anim id est laborum  r n           StringStream ss0   new StringStream s0           StringStream ss1   new StringStream            int line   1          Console WriteLine  Contents of input stream              Console WriteLine            using  StreamReader reader   new StreamReader ss0                         using  StreamWriter writer   new StreamWriter ss1                                 while   reader EndOfStream                                        string s   reader ReadLine                        Console WriteLine  Line     line            s                       writer WriteLine s                                                      Console WriteLine            Console WriteLine  Contents of output stream              Console WriteLine            Console Write ss1 ToString

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