Host Python In your Application with IronPython2.0.1 (一): 创建交互环境

上一次用了以前下载的IronPython 2.0 A1版, 今天下载了正式版2.0.1,发现变化不小啊...我过时了.

原有的代码已经不能正常运行, 于是在2.0.1正式版上再调整了一下.

using System;
using System.Collections.Generic;
using System.Text;
using IronPython.Hosting;
using IronPython.Runtime;
using Microsoft.Scripting;
using Microsoft.Scripting.Hosting;

namespace IPConsole {
    class Program {
        static void Main(string[] args) {
            /*
             * 方法一: 通过ScriptRuntimeSetup读取配置文件,加载动态语言引擎
            ScriptRuntimeSetup srs = ScriptRuntimeSetup.ReadConfiguration();
            ScriptRuntime runtime = new ScriptRuntime(srs);
            ScriptEngine engine = runtime.GetEngine("Python");
            *****/

            /*
             * 方法二:通过ScriptRuntime读取配置文件,加载引擎
            ScriptRuntime runtime = ScriptRuntime.CreateFromConfiguration();
            ScriptEngine engine = runtime.GetEngine("Python");
             * ***/

            /*
             * 方法三:直接创建引擎
             * ***/
            ScriptEngine engine = Python.CreateEngine();

            StringBuilder cmdBuff = new StringBuilder();
            string line = "";
            Console.WriteLine(string.Format("IronPython {0} ",  engine.LanguageVersion));  //print version

            ScriptScope scope = engine.CreateScope();
            //进入交互
            while (true) {
                if (cmdBuff.Length == 0) {
                    Console.Write(">>> ");  //first prompt
                }
                else {
                    Console.Write("... ");  //2nd and above prompt
                }

                //get command line
                line = Console.ReadLine();

                cmdBuff.AppendLine(line);

                if (line.StartsWith(" ") | line.StartsWith("\t") | line.EndsWith(":")){
                    //do nothing...get next input 
                }
                else {
                    //get the command and execute it
                    string cmd = cmdBuff.ToString();
                    try {
                        if (cmd.TrimEnd() == "quit") break;

                        //需要创建ScriptSource执行,InteractiveCode为交互环境
                        ScriptSource source = engine.CreateScriptSourceFromString(cmd, SourceCodeKind.InteractiveCode);
                        source.Execute(scope);
                    }
                    catch (Exception e) {
                        Console.WriteLine(e.Message);
                    }
                    //clear command buffer
                    cmdBuff.Length = 0; 
                }
            }
            Console.WriteLine("Quit");
        }
    }
}

在这里,创建引擎共有三种方式,其中前两种需要配置文件app.config配合, 如下:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="microsoft.scripting" type="Microsoft.Scripting.Hosting.Configuration.Section, Microsoft.Scripting" requirePermission="false" />
  </configSections>
  <microsoft.scripting>
    <languages>
      <language names="IronPython,Python,py"
                extensions=".py"
                displayName="IronPython 2.0.1"
                type="IronPython.Runtime.PythonContext,IronPython" />
      <!-- 可以添加其它引擎, 如IronRuby -->
    </languages>
  </microsoft.scripting>
</configuration>

再看一下测试结果吧, 比原来好了. 因为这个交互模式: 输入a也会显示a的值了,而不一定非要print

IronPython 2.0.0.0
>>> a=1
>>> a
1
>>> b=2
>>> b
2
>>> a==b
False
>>> def hello(name):
...     print "hello %s" % name
...
>>> hello('hydonlee')
hello hydonlee
>>> quit
Quit

以后的工作将在2.0.1正式版上进行.不过, 我没有找到api文档?alpha版都有,为什么正式版没有了?