Hello guys,
Another oddity with the IronPython 2 hosting API. This one may be the
correct behaviour, but it is different from IronPython 1.
When we set a UTF8 output stream on a runtime we see a UTF8 BOM being
written with the first output. I'm sure this didn't happen with
IronPython 1 because I now have failing tests!
The following code that traps standard out using a custom stream prints:
out: u'\ufeff'
out: 'foobar'
out: '\r\n'
out: 'foobar'
out: '\r\n'
import sys
import clr
clr.AddReference('IronPython')
clr.AddReference('Microsoft.Scripting')
from IronPython.Hosting import Python
from Microsoft.Scripting import SourceCodeKind
from System.Text import Encoding
from System.IO import MemoryStream
class CustomStream(MemoryStream):
def __new__(cls, prefix):
return MemoryStream.__new__(cls)
def __init__(self, prefix):
self._prefix = prefix
def Write(self, buffer, offset, count):
print self._prefix,
print repr(Encoding.UTF8.GetString(buffer, offset, count))
engine = Python.CreateEngine()
engine.Runtime.IO.SetOutput(CustomStream('out:'), Encoding.UTF8)
source = engine.CreateScriptSourceFromString('print "foobar"\r\n',
SourceCodeKind.Statements)
scope = engine.CreateScope()
code = source.Compile()
code.Execute(scope)
code.Execute(scope)
All the best,
Michael Foord
--
http://www.ironpythoninaction.com/
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