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.NET I/O via Streams
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The .NET namespace System.IO contains the primary .NET types for reading/writing bytes and text to/from data sources. The primary output constructs in this namespace are as follows: System.IO.BinaryWriter: Writes primitive data types as binary values. Create using new BinaryWriter(stream). You can create output streams using File.Create(filename). System.IO.StreamWriter: Writes textual strings and characters to a stream. The text is encoded according to a particular Unicode encoding. Create by using new StreamWriter(stream) and its variants or by using File.CreateText(filename). System.IO.StringWriter: Writes textual strings to a StringBuilder, which eventually can be used to generate a string.
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CHAPTER 4 INTRODUCING IMPERA TIVE PROGRA MMING
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Here is a simple example of using System.IO.File.CreateText to create StreamWriter and write two strings: > let outp = File.CreateText("playlist.txt");; val outp : StreamWriter > outp.WriteLine("Enchanted");; val it : unit = () > outp.WriteLine("Put your records on");; val it : unit = () > outp.Close(); These are the primary input constructs in the System.IO namespace: System.IO.BinaryReader: Reads primitive data types as binary values. When reading the binary data as a string, it interprets the bytes according to a particular Unicode encoding. Create using new BinaryReader(stream). System.IO.StreamReader: Reads a stream as textual strings and characters. The bytes are decoded to strings according to a particular Unicode encoding. Create by using new StreamReader(stream) and its variants or by using File.OpenText(filename). System.IO.StringReader: Reads a string as textual strings and characters. Here is a simple example of using System.IO.File.OpenText to create a StreamReader and read two strings: > let inp = File.OpenText("playlist.txt");; val inp : StreamReader > inp.ReadLine();; val it : string = "Enchanted" > inp.ReadLine();; val it : string = "Put your records on" > inp.Close();; val it : unit = ()
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Tip Whenever you create objects such as a StreamReader that have Close or Dispose operations or
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that implement the IDisposable interface, you should consider how you will eventually close or otherwise dispose of the resource. We discuss this later in this chapter and in 8.
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C HAPTE R 4 IN TRODUCING IMPERATIVE PROGRAM MIN G
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Some Other I/O-Related Types
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The System.IO namespace contains a number of other types, all of which are useful for some corner cases of advanced I/O but that you won t need to use from day to day. For example, you will see the following abstractions when browsing the .NET documentation: System.IO.TextReader: Reads textual strings and characters from an unspecified source. This is the common functionality implemented by the StreamReader and StringReader types and the System.Console.In object. The latter is used to access the stdin input. System.IO.TextWriter: Writes textual strings and characters to an unspecified output. This is the common functionality implemented by the StreamWriter and StringWriter types and the System.Console.Out and System.Console.Error objects. The latter are used to access the stdout and stderr output streams. System.IO.Stream: Provides a generic view of a sequence of bytes. Some functions that are generic over different kinds of output streams make use of these; for example, the formatting function twprintf discussed in section Using printf and Friends writes to any System.IO.TextWriter.
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Using System.Console
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Some simple input/output routines are provided in the System.Console class. For example: > System.Console.WriteLine("Hello World");; Hello World > System.Console.ReadLine();; <enter "I'm still here" here> val it : string = "I'm still here" The System.Console.Out object can also be used as a TextWriter.
Using printf and Friends
Throughout this book we have been using the printfn function, which is one way to print strings from F# values. This is a powerful, extensible technique for type-safe formatting. A related function called sprintf builds strings: > sprintf "Name: %s, Age: %d" "Anna" 3;; val it : string = "Name: Anna, Age: 3" The format strings accepted by printf and sprintf are recognized and parsed by the F# compiler, and their use is statically type checked to ensure the arguments given for the formatting holes are consistent with the formatting directives. For example, if you use an integer where a string is expected, you will see a type error:
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