c# - 在 C# 中捕获 python 打印语句

Question

我正在编写一个 C# 组件，它将一个 ironpython 函数作为参数。

    def test():
        x=x+1
        print "Test"

C#:

    var v = engine.Operations.Invoke(scope.GetVariable("test"));

Var v 为 print 语句返回 null。只有当我有 return(x) 时它才有效。我可以使用 ironpython 捕获打印语句吗？

欢迎评论和链接。另外，是否可以使用命令行捕获它？

Answer 1

这对我有用:

using IronPython.Hosting; 
using Microsoft.Scripting.Hosting; //provides scripting abilities comparable to batch files
using System.IO;
using System;
using System.Text;

var script = @"import sys
def test(): 
    print sys.version
    print >> sys.stderr, 'this goes to stderr'
    return 42";

var scriptEngine = Python.CreateEngine();
var scriptScope = scriptEngine.CreateScope();
scriptEngine.Execute(script, scriptScope);
var testFn = scriptScope.GetVariable("test");
var streamOut = new MemoryStream();
var streamErr = new MemoryStream();
scriptEngine.Runtime.IO.SetOutput(streamOut, Encoding.Default);
scriptEngine.Runtime.IO.SetErrorOutput(streamErr, Encoding.Default);
scriptEngine.Operations.Invoke(testFn);
Console.WriteLine("returned: {0}", scriptEngine.Operations.Invoke(testFn));
Console.WriteLine("captured out:\n{0}", Encoding.Default.GetString(streamOut.ToArray()));
Console.WriteLine("captured err:\n{0}", Encoding.Default.GetString(streamErr.ToArray()));

输出:

returned: 42
captured out:
2.7.5b2 (IronPython 2.7.5b2 (2.7.5.0) on .NET 2.0.50727.5477 (64-bit))

captured err:
this goes to stderr