unity 打开电脑本地文件夹

1.调用方法如下

这是选择路径

2.代码如下

using System;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;

/// <summary>
/// 调用系统代码,打开本地文件夹
/// </summary>
[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;
}

[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 static class FolderBrowserHelper
{

    #region Window

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    private static extern bool GetOpenFileName([In, Out] OpenFileName ofn);

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

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    private static extern bool GetOpenFileName([In, Out] OpenDialogFile ofn);

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    private static extern bool GetSaveFileName([In, Out] OpenDialogFile ofn);

    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    private static extern IntPtr SHBrowseForFolder([In, Out] OpenDialogDir ofn);

    [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    private static extern bool SHGetPathFromIDList([In] IntPtr pidl, [In, Out] char[] fileName);

    #endregion

    public const string IMAGEFILTER = "图片文件(*.jpg;*.png)\0*.jpg;*.png";
    public const string ALLFILTER = "所有文件(*.*)\0*.*";

    /// <summary>
    /// 选择文件
    /// </summary>
    /// <param name="callback">返回选择文件夹的路径</param>
    /// <param name="filter">文件类型筛选器</param>
    public static void SelectFile(Action<string> callback, string filter = ALLFILTER)
    {
        try
        {
            OpenFileName openFileName = new OpenFileName();
            openFileName.structSize  = Marshal.SizeOf(openFileName);
            // openFileName.initialDir = "初始目录"

            openFileName.filter = filter;
            openFileName.file = new string(new char[256]);
            openFileName.maxFile = openFileName.file.Length;
            openFileName.fileTitle = new string(new char[64]);
            openFileName.maxFileTitle = openFileName.fileTitle.Length;
            openFileName.title = "选择文件";
            openFileName.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;
            if (GetSaveFileName(openFileName))
            {
                string filepath = openFileName.file; //选择的文件路径;  
                if (File.Exists(filepath))
                {
                    if (callback != null)
                        callback(filepath);
                    return;
                }
            }
        }
        catch (Exception e)
        {
            Debug.LogError(e);
        }

        if (callback != null)
            callback(string.Empty);
    }

    /// <summary>
    /// 调用WindowsExploer 并返回所选文件夹路径
    /// </summary>
    /// <param name="dialogtitle">打开对话框的标题</param>
    /// <returns>所选文件夹路径</returns>
    public static string GetPathFromWindowsExplorer(string dialogtitle = "请选择下载路径")
    {
        try
        {
            OpenDialogDir ofn2 = new OpenDialogDir();
            ofn2.pszDisplayName = new string(new char[2048]);
            ; // 存放目录路径缓冲区  
            ofn2.lpszTitle = dialogtitle; // 标题  
            ofn2.ulFlags = 0x00000040; // 新的样式,带编辑框  
            IntPtr pidlPtr = SHBrowseForFolder(ofn2);

            char[] charArray = new char[2048];

            for (int i = 0; i < 2048; i++)
            {
                charArray[i] = '\0';
            }

            SHGetPathFromIDList(pidlPtr, charArray);
            string res = new string(charArray);
            res = res.Substring(0, res.IndexOf('\0'));
            return res;
        }
        catch (Exception e)
        {
            Debug.LogError(e);
        }

        return string.Empty;
    }

    /// <summary>
    /// 打开目录
    /// </summary>
    /// <param name="path">将要打开的文件目录</param>
    public static void OpenFolder(string path)
    {
        System.Diagnostics.Process.Start("explorer.exe", path);
    }
}

3.选择一个文件夹,然后把文件夹里面的东西复制到另一个文件夹里面

 /// <summary>
    /// 选择一个文件夹,然后把文件夹里面的东西复制到另一个文件夹里面
    /// </summary>
    /// <param name="sourcePath">选择的路径</param>
    /// <param name="destPath">另一个路径</param>
    public void CopyFolder(string sourcePath, string destPath)
    {
        if (Directory.Exists(sourcePath))
        {
            if (!Directory.Exists(destPath))
            {
                try
                {
                    Directory.CreateDirectory(destPath);
                }
                catch (Exception ex)
                {
                    throw new Exception("创建目标目录失败:" + ex.Message);
                }
            }
            List<string> files = new List<string>(Directory.GetFiles(sourcePath));
            files.ForEach(c =>
            {
                string destFile = Path.Combine(destPath, Path.GetFileName(c));
                File.Copy(c, destFile, true);

            });
            List<string> folders = new List<string>(Directory.GetDirectories(sourcePath));
            folders.ForEach(c =>
            {
                string destDir = Path.Combine(destPath, Path.GetFileName(c));
                CopyFolder(c, destDir);
            });
        }
        else
        {
            throw new DirectoryNotFoundException("源目录不存在!");
        }
    }

4.选择本地文件并打开

/// <summary>
    /// 选择本地文件并打开
    /// </summary>
    public void onRead()
    {     
        OpenFileName ofn = new OpenFileName();

        ofn.structSize = Marshal.SizeOf(ofn);

        ofn.filter = "Excel文件(*.dxf)\0*.dxf";

        ofn.file = new string(new char[256]);

        ofn.maxFile = ofn.file.Length;

        ofn.fileTitle = new string(new char[64]);

        ofn.maxFileTitle = ofn.fileTitle.Length;
        string path = Application.streamingAssetsPath;
        path = path.Replace('/', '\\');
        //默认路径
        ofn.initialDir = path;
        //ofn.initialDir = "D:\\MyProject\\UnityOpenCV\\Assets\\StreamingAssets";
        ofn.title = "Open Project";

        ofn.defExt = "DXF";//显示文件的类型
                           //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

        if (ofn.file != "")
        {
            if (WindowDll.GetOpenFileName(ofn))
            {
                
                Manager._Instantiate.LoadDXF(ofn.file);
                //print(ofn.file);
                OnClickAdd(ofn.file);
                GameManager.instance_.btn_shengcheng3wei.transform.GetChild(3).gameObject.SetActive(true);
            }
            else
            {
                GameManager.instance_.btn_shengcheng3wei.SetActive(false);

                GameManager.instance_.QuXiaoDaoRuCad();
             
            }
        }
        
    }