using System;using System.Collections;using System.Collections.Generic;using System.Runtime.InteropServices;using UnityEngine;//unity3d调用win32打开对话框[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]public struct OpenFileName{    public int structSize;    public IntPtr dlgOwner;    public IntPtr instance;    public string filter;    public string customFilter;    public int maxCustFilter;    public int filterIndex;    public string file;    public int maxFile;    public string fileTitle;    public int maxFileTitle;    public string initialDir;  //打开路径     null    public string title;    public int flags;    public short fileOffset;    public short fileExtension;    public string defExt;    public IntPtr custData;    public IntPtr hook;    public string templateName;    public IntPtr reservedPtr;    public int reservedInt;    public int flagsEx;}public class OpenPDF:MonoBehaviour{    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]    private static extern bool GetOpenFileName([In, Out] OpenFileName ofn);    OpenFileName ofn;    void Start()    {        ofn = new OpenFileName();        ofn.structSize = Marshal.SizeOf(ofn);        ofn.filter = "PDF文件(*.pdf)\0*.pdf;";        ofn.file = new string(new char[256]);        ofn.maxFile = ofn.file.Length;        ofn.fileTitle = new string(new char[64]);        ofn.maxFileTitle = ofn.fileTitle.Length;        ofn.initialDir = "C:\\";        ofn.title = "打开课件";        ofn.defExt = "PDF";        ofn.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;   //OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST| OFN_ALLOWMULTISELECT|OFN_NOCHANGEDIR        }    public void OpenFile()    {        StartCoroutine(SelectFile());    }    IEnumerator SelectFile()    {        yield return 1;        List
     
       fliePath = GetFilePath();        for (int i = 0; i < fliePath.Count; i++)        {            Debug.Log(fliePath[i]);        }    }    /// 
      
    /// 支持同时选择多个文件    /// 
    /// 
          public List
      
        GetFilePath()    {        List
       
         fliePath = new List
        
         ();        if (GetOpenFileName(ofn))        {            string[] filePath = ofn.file.Split('\0');// ‘\0’可表示C++中的NULL            for (int i = 0; i < filePath.Length; i++)            {                if (!string.IsNullOrEmpty(filePath[i])&&i!=0)                {                    fliePath.Add(filePath[0]+ filePath[i]);                }            }        }        else        {            Debug.Log("取消选择");        }        return fliePath;    }}