using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using UnityEngine;
 
public static class FolderPicker
{

 
    public static string GetPath()
    {
        OpenDialogDir ofn2 = new OpenDialogDir();
 
        ofn2.pszDisplayName = new string(new char[2000]);
        ofn2.lpszTitle = "请选择至 package\\mu3_Data\\StreamingAssets\\assets";
        // ofn2.pidlRoot = IntPtr.Zero;
        IntPtr pidlPtr = DllOpenFileDialog.SHBrowseForFolder(ofn2);
        // return "";
 
        char[] charArray = new char[2000];
        for (int i = 0; i < 2000; i++)
            charArray[i] = '\0';
 
        DllOpenFileDialog.SHGetPathFromIDList(pidlPtr, charArray);
        string fullDirPath = new String(charArray);
        fullDirPath = fullDirPath.Substring(0, fullDirPath.IndexOf('\0'));
 
        fullDirPath += "\\";
 
        Debug.Log(fullDirPath);
        return fullDirPath;
    }
 
    public static string GetFilePath()
    {
        string filepath = "";
        OpenDialogFile pth = new OpenDialogFile();
        pth.structSize = Marshal.SizeOf(pth);
        pth.filter = "All files (*.*)|*.*";
        pth.file = new string(new char[256]);
        pth.maxFile = pth.file.Length;
        pth.fileTitle = new string(new char[64]);
        pth.maxFileTitle = pth.fileTitle.Length;
        pth.initialDir = Application.dataPath; //默认路径
        pth.title = "请选择文件";
        pth.defExt = "";
        pth.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;
        if (DllOpenFileDialog.GetSaveFileName(pth))
            // if (DllOpenFileDialog.GetOpenFileName(pth))
        {
            filepath = pth.file; //选择的文件路径; 
            Debug.Log(filepath);
        }
 
        return filepath;
    }
 
}
 
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenDialogFile
{
    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;
}
 
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class OpenDialogDir
{
    public IntPtr hwndOwner = IntPtr.Zero;
    public IntPtr pidlRoot = IntPtr.Zero;
    public String pszDisplayName = null;
    public String lpszTitle = null;
    public UInt32 ulFlags = 0;
    public IntPtr lpfn = IntPtr.Zero;
    public IntPtr lParam = IntPtr.Zero;
    public int iImage = 0;
}
 
public class DllOpenFileDialog
{
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetOpenFileName([In, Out] OpenDialogFile ofn);
 
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetSaveFileName([In, Out] OpenDialogFile ofn);
 
    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern IntPtr SHBrowseForFolder([In, Out] OpenDialogDir ofn);
 
    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool SHGetPathFromIDList([In] IntPtr pidl, [In, Out] char[] fileName);
}