Is it possible to compile and run C# code on-the-fly on mobile?

Question

Hi, all:

What I want to do here is to make a console in game, which is common in games with some script language like Lua.

And, as Unity uses C#, I think it might not be necessary to employ another script language, and also it could save some CSharp-Lua binding work.

After some experiments with CodeDomProvider, I could run up the console in PC setting, but I cannot figure out how to make it run on Android.

From the DDMS, I get this error log:

 08-28 22:32:53.490: I/Unity(29077): SystemException: Error running gmcs: Cannot find the specified file
 08-28 22:32:53.490: I/Unity(29077):   at Mono.CSharp.CSharpCodeCompiler.CompileFromFileBatch (System.CodeDom.Compiler.CompilerParameters options, System.String[] fileNames) [0x00000] in <filename unknown>:0 
 08-28 22:32:53.490: I/Unity(29077):   at Mono.CSharp.CSharpCodeCompiler.CompileFromSourceBatch (System.CodeDom.Compiler.CompilerParameters options, System.String[] sources) [0x00000] in <filename unknown>:0 
 08-28 22:32:53.490: I/Unity(29077):   at Mono.CSharp.CSharpCodeCompiler.CompileAssemblyFromSourceBatch (System.CodeDom.Compiler.CompilerParameters options, System.String[] sources) [0x00000] in <filename unknown>:0 
 08-28 22:32:53.490: I/Unity(29077):   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromSource (System.CodeDom.Compiler.CompilerParameters options, System.String[] fileNames) [0x00000] in <filename unknown>:0 
 08-28 22:32:53.490: I/Unity(29077):   at InputScript._CompileCode (System.String code) [0x00000] in <filename unknown>:0 
 08-28 22:32:53.490: I/Unity(29077):   at InputScript.OnGUI () [0x00000] in <filename unknown>:0

It looks like the compiler gmcs is not around on Android Mono Runtime(?)

So, does that mean Mono cannot compile C# code on-the-fly on mobile? And I still have to use Lua as the script?

Answer 1

Some weird issues arise after switching from unity3.5 to unity4.1.3. With some trial & errors, finally I found a workaround, just skip referencing Mono.Cecil & UnityEditor, and it will be okay.

I post my code(modified) below in case someone is interested.

 using UnityEngine;
 using System.Collections;
 using System;
 using Mono.CSharp;
 
 public class CmdConsole : MonoBehaviour/*Singleton<CmdConsole>*/
 {
     public KeyCode[] m_ShortcutKeys = new KeyCode[]{KeyCode.LeftAlt, KeyCode.F12}; //the keys used to open Console;
     public bool m_IsConsoleOpen = false;
 
     private string m_editstr = "";
     private string m_result = "";
 
     private int m_cmdId = 0; //used to identify cmd
 
     // Use this for initialization
     void Start () {
         Mono.CSharp.Evaluator.Init(new string[] { });
         foreach (System.Reflection.Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
         {
             //Dbg.Log("refer: {0}", assembly.FullName);
             if( assembly.FullName.Contains("Cecil") || assembly.FullName.Contains("UnityEditor") )
                 continue;
             Mono.CSharp.Evaluator.ReferenceAssembly(assembly);
         }
         Evaluator.Run ("using UnityEngine;\n" + 
                        "using System;"
                        );
     }
 
     void Update() {
         //check if the console should be opened
         if (m_IsConsoleOpen)
             return;
 
         bool bAllKeysDown = true;
         foreach ( KeyCode kc in m_ShortcutKeys )
         {
             if( !Input.GetKey(kc) )
             {
                 bAllKeysDown = false;
                 break;
             }
         }
 
         if( bAllKeysDown )
         {
             m_IsConsoleOpen = true;
         }
     }
 
     void OnGUI()
     {
         if (!m_IsConsoleOpen)
             return;
 
         m_editstr = GUI.TextArea(new Rect(10, 10, 400, 100), m_editstr);
 
         if( GUI.Button(new Rect(420, 60, 100, 40), "Execute") )
         {
             ++m_cmdId;
             bool bSuccess = Run(m_editstr);
             m_result = string.Format("{0}: {1}", m_cmdId, bSuccess ? "OK" : "Fail");
             m_editstr = ""; //clear the script
         }
 
         if( GUI.Button(new Rect(530, 60, 100, 40), "Close") )
         {
             m_IsConsoleOpen = false;
         }
 
         if (m_result.Length > 0)
         {
             GUI.TextArea(new Rect(420, 10, 200, 30), m_result);
         }
     }
 
 
     public bool Run(string cmd) {
         return Evaluator.Run(cmd);
     }
 
 }

Is it possible to compile and run C# code on-the-fly on mobile?

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