using UnityEngine;
using System.Collections;
using System;
using System.Runtime.InteropServices;

namespace Public.File
{
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class OpenFileName
    {
        public int structSize = 0;
        public IntPtr dlgOwner = IntPtr.Zero;
        public IntPtr instance = IntPtr.Zero;
        public String filter = null;
        public String customFilter = null;
        public int maxCustFilter = 0;
        public int filterIndex = 0;
        public String file = null;
        public int maxFile = 0;
        public String fileTitle = null;
        public int maxFileTitle = 0;
        public String initialDir = null;
        public String title = null;
        public int flags = 0;
        public short fileOffset = 0;
        public short fileExtension = 0;
        public String defExt = null;
        public IntPtr custData = IntPtr.Zero;
        public IntPtr hook = IntPtr.Zero;
        public String templateName = null;
        public IntPtr reservedPtr = IntPtr.Zero;
        public int reservedInt = 0;
        public int flagsEx = 0;
    }

    public class DllTest
    {
        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
        public static bool GetOpenFileName1([In, Out] OpenFileName ofn)
        {
            return GetOpenFileName(ofn);
        }

        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        public static extern bool GetSaveFileName([In, Out] OpenFileName ofn);
        public static bool GetSaveFileName1([In, Out] OpenFileName ofn)
        {
            return GetSaveFileName(ofn);
        }
      
    }


    public class OpenWindow
    {
        /// <summary>
        /// 获取指定文件路径
        /// </summary>
        /// <param name="path">待选择的文件夹路径</param>
        /// <param name="filter">文件后缀限定,格式为 "Excel Files(*.xlsx:*.xls)\0*.xlsx:*.xls\0"，默认可选任何文件</param>
        /// <returns></returns>
        public static string GetFilePath(string title,string path=null,string  filter=null)
        {
            OpenFileName ofn = new OpenFileName();
            ofn.structSize = Marshal.SizeOf(ofn);
            if (!string.IsNullOrEmpty(filter))
                ofn.filter = filter;
            else
                ofn.filter = "All Files\0*.*\0\0";
            ofn.file = new string(new char[256]);
            ofn.maxFile = ofn.file.Length;
            ofn.fileTitle = new string(new char[64]);
            ofn.maxFileTitle = ofn.fileTitle.Length;
            if(path==null)
                ofn.initialDir = UnityEngine.Application.dataPath.Replace('/', '\\');//默认路径
            else
                ofn.initialDir = path.Replace('/','\\');//指定路径
            ofn.title = title;
            ofn.defExt = "xml";
            //注意 一下项目不一定要全选 但是0x00000008项不要缺少
            ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;//OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR
            //打开windows框
            if (DllTest.GetOpenFileName(ofn))
            {
                string replay_file_name = ofn.file.ToString();
                Debug.Log(replay_file_name);
                return replay_file_name;
            }
            else
                return null;
        }
    }
}