unity打开文件夹、打开文件

1.创建工具

using UnityEngine;

using System.Collections;

using System;

using System.Runtime.InteropServices;

[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;

}

[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 LocalDialog

{

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]

    public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);

    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]

    public static extern bool GetSaveFileName([In, Out] OpenFileName 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);

}

用法：

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

void OpenFile() {
        OpenFileName openFileName = new OpenFileName();

        openFileName.structSize = Marshal.SizeOf(openFileName);

        openFileName.filter = "Excel文件(*.txt)\0*.txt";

        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.initialDir = Application.streamingAssetsPath.Replace('/', '\\');//默认路径

        openFileName.title = "窗口标题";

        openFileName.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;

        if (LocalDialog.GetSaveFileName(openFileName))

        {

            Debug.Log(openFileName.file);

            Debug.Log(openFileName.fileTitle);

        }
    }

    void OpenDirect() {
        OpenDialogDir ofn2 = new OpenDialogDir();
        ofn2.pszDisplayName = new string(new char[2000]); ;     // 存放目录路径缓冲区  
        ofn2.lpszTitle = "Open Project";// 标题  
        //ofn2.ulFlags = BIF_NEWDIALOGSTYLE | BIF_EDITBOX; // 新的样式,带编辑框  
        IntPtr pidlPtr = LocalDialog.SHBrowseForFolder(ofn2);

        char[] charArray = new char[2000];
        for (int i = 0; i < 2000; i++)
            charArray[i] = '\0';

        LocalDialog.SHGetPathFromIDList(pidlPtr, charArray);
        string fullDirPath = new String(charArray);
        fullDirPath = fullDirPath.Substring(0, fullDirPath.IndexOf('\0'));

        Debug.Log(fullDirPath);//这个就是选择的目录路径。
    }