Unity调用系统窗口选择文件或文件路径

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1.OpenFileName数据接收类，如下：

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;}

2.系统函数调用类， 如下：
public class LocalDialog{    //链接指定系统函数       打开文件对话框    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]    public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);    public static bool GetOFN([In, Out] OpenFileName ofn)    {        return GetOpenFileName(ofn);    }    //链接指定系统函数        另存为对话框    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]    public static extern bool GetSaveFileName([In, Out] OpenFileName ofn);    public static bool GetSFN([In,Out] OpenFileName ofn)    {        return GetSaveFileName(ofn);     }}

3.测试入口类，如下：
using UnityEngine;using System.Collections;using System.Runtime.InteropServices;public class DialogTest : MonoBehaviour {    void OnGUI()    {        if (GUI.Button(new Rect(10,10,100,50),"Open"))        {            OpenFileName openFileName = new OpenFileName();            openFileName.structSize = Marshal.SizeOf(openFileName);            openFileName.filter = "Excel文件(*.xlsx)\0*.xlsx";            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);            }        }    }}


效果如下：

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