Re: [Ikvm-developers] Trouble with C# Console.SetOut and Console.SetError and Java PrintSream

[Jeroen F. <je...@su...>]

Hi,

For maximum compatibility System.out/err/in use the underlying streams and the Java encodings, so if you want to redirect you have to either do it at the stdout/stderr/stdin level or use Java's System.setOut(), System.setErr() or System.setIn().

Regards,
Jeroen

> -----Original Message-----
> From: Dr O'Neil Delpratt [mailto:on...@sa...]
> Sent: Tuesday, October 29, 2013 16:16
> To: ikv...@li...
> Cc: me...@da...; Michael Kay
> Subject: [Ikvm-developers] Trouble with C# Console.SetOut and
> Console.SetError and Java PrintSream
> 
> Hi,
> 
> In C# it is possible to set the Console.Out and Console.Error to a
> TextWriter. However, in my simple java program below a call to
> System.out.println does not write to the the TextWriter, but instead
> writes to the console window. Is this the expected behaviour for IKVM?
> Does IKVM not map the java System.out to its equivelent under C#, i.e.
> Console.out? I am using IKVM 0.46.0.2.
> This problem is from a user support issue at:
> https://saxonica.plan.io/boards/3/topics/5823
> 
> Java Program:
> 
> public class ProgTest {
> 
>      public ProgTest(){}
> 
>      public void print(){
>          java.io.PrintStream out = System.out;
>          out.println("Test of the java printstream");
>      }
> 
>      public static void main(){
>          ProgTest test = new ProgTest();
>          test.print();
>      }
> }
> 
> -------------------------------------
> C# Program snippet:
> 
> class Program
>      {
>          static void Main(string[] args)
>          {
>              // Cache the default Console TextWriter so we can use it
> again later.
>              TextWriter defaultWriter = Console.Out;
> 
>              // Create a RecordingTextWriter and set it to be used for
> Console.Out and Console.Error
>              RecordingTextWriter writer = new RecordingTextWriter();
>              Console.SetOut(writer);
>              Console.SetError(writer);
> 
>              // Perform some operations that will write to the Console,
> which has been set to the RecordingTextWriter.
>              performOperation();
> 
>              // Now that everything is done, set Console.Out back to the
> default value and display the result:
>              Console.SetOut(defaultWriter);
>              Console.WriteLine("The RecordingTextWriter object recorded
> the following string:\n" + writer.Record.ToString());
>          }
> 
>          private static void performOperation()
>          {
>              // Will record to the RecordingTextWriter class
>              Console.WriteLine("I'm writing on the default Console.
> Next, I want to see what Saxon writes on the default Console.");
> 
>              // Next, create some Saxon classes and make them dump
> errors on the Console.
>              try
>              {
>                  ProgTest test = new ProgTest();
>                  test.print();
>             }
>              catch (Exception ex)
>              {
>                  Console.Error.WriteLine("Oh no!  There was an error!");
>                  Console.Error.WriteLine(ex.ToString());
>              }
>          }
>      }
> 
>      public class RecordingTextWriter : TextWriter
>      {
>          public StringBuilder Record { get; private set; }
> 
>          public RecordingTextWriter()
>          {
>              Record = new StringBuilder();
>          }
> 
>          // Override Write and WriteLine so that the values recorded go
> to the Record StringBuilder.
>          public override void Write(string value)
>          {
>              Record.Append(value);
>          }
>          public override void WriteLine(string value)
>          {
>              Record.AppendLine(value);
>          }
>          public override void WriteLine()
>          {
>              Record.AppendLine();
>          }
> 
>          public override Encoding Encoding
>          {
>              get { throw new NotImplementedException(); }
>          }
>      }
> }
> 
> Kind regards,
> 
> O'Neil
> 
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