I have the following:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button3_Click(object sender, EventArgs e)
{
try
{
var strExpression = @"
import sys
sys.stdout=my.write
print 'ABC'
";
var engine = Python.CreateEngine();
var scope = engine.CreateScope();
var sourceCode = engine.CreateScriptSourceFromString(strExpression);
scope.SetVariable("my", this);
var actual = sourceCode.Execute<string>(scope);
textBox1.Text += actual;
}
catch (Sy开发者_运维百科stem.Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
public void write(string s)
{
textBox1.Text += s;
}
}
But I am getting an Exception
that says there is no write
.
What am I doing incorrectly?
You can set a stream and a textwriter directly from c#:
engine.Runtime.IO.SetOutput(stream, txtWriter);
engine.Runtime.IO.SetErrorOutput(stream, txtWriter);
To redirect the output for example you could override TextWriter class with a new one writing on your textbox.
e.g.
in my application I did an override of StreamWriter class that rises events when something is written on the stream (here just a part of the code):
public class MyEvtArgs<T> : EventArgs
{
public T Value
{
get;
private set;
}
public MyEvtArgs(T value)
{
this.Value = value;
}
}
public class EventRaisingStreamWriter : StreamWriter
{
#region Event
public event EventHandler<MyEvtArgs<string>> StringWritten;
#endregion
#region CTOR
public EventRaisingStreamWriter(Stream s):base(s)
{ }
#endregion
#region Private Methods
private void LaunchEvent(string txtWritten)
{
if (StringWritten != null)
{
StringWritten(this, new MyEvtArgs<string>(txtWritten));
}
}
#endregion
#region Overrides
public override void Write(string value)
{
base.Write(value);
LaunchEvent(value);
}
public override void Write(bool value)
{
base.Write(value);
LaunchEvent(value.ToString());
}
// here override all writing methods...
#endregion
}
Then in your application you should just do something like:
MemoryStream ms = new MemoryStream();
EventRaisingStreamWriter outputWr = new EventRaisingStreamWriter(ms);
outputWr.StringWritten += new EventHandler<MyEvtArgs<string>>(sWr_StringWritten);
var engine = Python.CreateEngine();
engine.Runtime.IO.SetOutput(ms, outputWr);
engine.CreateScriptSourceFromString("print 'hello world!'").Execute();
void sWr_StringWritten(object sender, MyEvtArgs<string> e)
{
textBox1.Text += e.Value;
}
Your example is close to working.
The problem you saw is because sys.stdout=my.write
should be sys.stdout=my
.
It also appears that Python expects to find a boolean softspace
attribute.
I have made these two changes in the code below. Hopefully this should now work as you expected.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button3_Click(object sender, EventArgs e)
{
try
{
var strExpression = @"
import sys
sys.stdout=my
print 'ABC' ";
var engine = Python.CreateEngine();
var scope = engine.CreateScope();
var sourceCode = engine.CreateScriptSourceFromString(strExpression);
scope.SetVariable("my", this);
var actual = sourceCode.Execute(scope);
textBox1.Text += actual;
} catch (System.Exception ex) {
MessageBox.Show(ex.ToString());
}
}
public bool softspace;
public void write(string s)
{
textBox1.Text += s;
}
}
This worked fine for me
pyRuntime = Python.CreateRuntime();
pyRuntime.IO.SetOutput(Console.OpenStandardOutput(), new UTF8Encoding(true, false));
精彩评论