Unity3D调用系统窗口选择本地文件(PC端)

 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;
 }

 public class WindowDll
 {
     [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
     public static extern bool GetOpenFileName([In, Out] OpenFileName ofn);
     public static bool GetOpenFileName1([In, Out] OpenFileName ofn)
     {
         return GetOpenFileName(ofn);
     }
 }

 using UnityEngine;
 using System.Collections;
 using System.Runtime.InteropServices;

 public class CameraTest : MonoBehaviour
 {
     public WebCamTexture cameraTexture;
     public string cameraName = "";
     private bool isPlay = false;
     // Use this for initialization
     void Start()
     {
         //StartCoroutine(OpenCamera());
     }

     // Update is called once per frame
     void Update()
     {

     }
     ///
     /// 获取权限打开摄像头
     ///
     ///
     IEnumerator OpenCamera()
     {
         yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
         if (Application.HasUserAuthorization(UserAuthorization.WebCam))
         {
             WebCamDevice[] devices = WebCamTexture.devices;
             cameraName = devices[0].name;
             cameraTexture = new WebCamTexture(cameraName, 320, 240, 15);
             cameraTexture.Play();
             isPlay = true;
         }
     }

     void OnGUI()
     {
         if (isPlay)
         {
             GUI.DrawTexture(new Rect(0, 0, 320, 240), cameraTexture, ScaleMode.ScaleAndCrop);
         }

         if (GUI.Button(new Rect(0, 0, 100, 35), "OpenDialog"))
         {
             OpenFileName ofn = new OpenFileName();

             ofn.structSize = Marshal.SizeOf(ofn);

             ofn.filter = "All Files\0*.*\0\0";

             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 = UnityEngine.Application.dataPath;//默认路径

             ofn.title = "Open Project";

             ofn.defExt = "JPG";//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 (WindowDll.GetOpenFileName(ofn))
             {
                 Debug.Log("Selected file with full path: {0}" + ofn.file);
             }

         }
     }
 }

原文地址点击这里

文件的类型设置

 ofn.filter = "图片文件(*.jpg*.png)\0*.jpg;*.png";