using HuizhongLibrary.Log;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;

namespace HuizhongLibrary
{
    public class DllInvoke
    {
        [DllImport("kernel32.dll")]
        private extern static IntPtr LoadLibrary(String path);

        [DllImport("kernel32.dll")]
        private extern static IntPtr GetProcAddress(IntPtr lib, String funcName);

        [DllImport("kernel32.dll")]
        private extern static bool FreeLibrary(IntPtr lib);

        private IntPtr hLib;

        public DllInvoke(String DLLPath)
        {
            if (System.IO.File.Exists(DLLPath) == false)
            {
                ErrorFollow.TraceWrite("加载动态库错误", DLLPath, "文件不存在");
                return;
            }
            try
            {
                hLib = LoadLibrary(DLLPath);
            }
            catch (Exception ex)
            {
                ErrorFollow.TraceWrite("加载动态库错误", DLLPath, ex.Message);
            }

        }

        ~DllInvoke()
        {
            FreeLibrary(hLib);
        }

        public int GetHandle()
        {
            return hLib.ToInt32();
        }

        //将要执行的函数转换为委托 
        public Delegate Invoke(String APIName, Type t)
        {
            IntPtr api = GetProcAddress(hLib, APIName);
            return (Delegate)Marshal.GetDelegateForFunctionPointer(api, t);
        }


        public delegate int Compile(String command, StringBuilder inf);
        public void test()
        {
            //编译 
            DllInvoke dll = new DllInvoke("~/Bin/Judge.dll");
            Compile compile = (Compile)dll.Invoke("Compile", typeof(Compile));
            //compile();//这里就是调用我的DLL里定义的Compile函数
        }
    }
}