Unity打开电脑本地文件夹选择图片替换

Posted 2023-03-31 小马学习笔记

Unity打开电脑本地文件夹选择图片替换

• • 创建工程添加对应的UI如图所示
  • 创建ChangeImage脚本来监听按钮事件
  • 创建OpenFileName脚本
  • 将代码挂在到窗口，点击运行

创建工程添加对应的UI如图所示

创建ChangeImage脚本来监听按钮事件

/****************************************************
    文件：ChangeImage.cs
	作者：Mark
    日期：#CreateTime#
	功能：用于替换图片
*****************************************************/

using System;
using System.Collections;
using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
public class ChangeImage : MonoBehaviour 

    public Image currentImage;//当前图片
    public Button selectBtn;//选择图片的按钮
    private void Start()
    
        selectBtn.onClick.AddListener(OnSelectBtnOnclick);//监听按是否被按下，按下则执行括号中的方法
    
//当按钮被按下时执行该脚本，打开本地文件夹
    private void OnSelectBtnOnclick()
    
        OpenFileName ofn = new OpenFileName();

        ofn.structSize = Marshal.SizeOf(ofn);
        //可进行修改选择的文件类型
        ofn.filter = "图片文件(*.jpg*.png)\\0*.jpg;*.png";
        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.title = "选择需要替换的图片";

        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))
        
            StartCoroutine(LoadTextrue(ofn.file));
        
    
    //加载选择的图片并进行替换    IEnumerator LoadTextrue(string path)
    
        UnityWebRequest unityWebRequest = new UnityWebRequest("file:///" + path);
        DownloadHandlerTexture handlerTexture = new DownloadHandlerTexture(true);
        unityWebRequest.downloadHandler = handlerTexture;
        yield return unityWebRequest.SendWebRequest();
        if (unityWebRequest.isNetworkError || unityWebRequest.isHttpError)
        
            print(unityWebRequest.error);
        
        else
        
            Texture2D t = handlerTexture.texture;
            //将选择的图片替换上去
            currentImage.sprite = Sprite.Create(t, new Rect(0, 0, t.width, t.height), Vector2.one);
        
    

其中OpenFileName 的类为打开windows文件夹的类 不需要任何操作 复制即用

创建OpenFileName脚本

/****************************************************
    文件：OpenFileName.cs
	作者：Mark
    日期：#CreateTime#
	功能：打开文件夹
*****************************************************/

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);
    

将代码挂在到窗口，点击运行

100个 Unity实用技能| Unity将本地图片文件显示到Image组件中 通用方法整理

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• 也可以简单把 Unity 理解为一个游戏引擎，可以用来专业制作游戏！

• 🎬 博客主页：https://xiaoy.blog.csdn.net

• 🎥 本文由 呆呆敲代码的小Y 原创，首发于 CSDN🙉

• 🎄 学习专栏推荐：Unity系统学习专栏

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• ------------------❤️分割线❤️-------------------------

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Unity 实用小技能学习

Unity将本地图片文件显示到Image组件中 通用方法整理

本文总结了两种将本地图片文件显示到Image组件中 的两种方法，下面一起来看一下吧！

方法一：通过命名空间 System.IO 加载本地图片文件

using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class Demo : MonoBehaviour

	public Image _faceSearchImage;
	private Texture2D m_Tex;

	/// <summary>
	/// 根据路径读取本地文件并转换为Texture2D文件
	/// </summary>
	/// <param name="path"></param>
	private void LoadFromFile(string path)
	
		m_Tex = new Texture2D(1, 1);
		//读取图片字节流
		m_Tex.LoadImage(ReadPNG(path));

		//变换格式
		Sprite tempSprite = Sprite.Create(m_Tex, new Rect(0, 0, m_Tex.width, m_Tex.height), new Vector2(10, 10));
		_faceSearchImage.sprite = tempSprite;//赋值
	

	private byte[] ReadPNG(string path)
	
		Debug.Log(path);
		FileStream fileStream = new FileStream(path, FileMode.Open, System.IO.FileAccess.Read);

		fileStream.Seek(0, SeekOrigin.Begin);
		//创建文件长度的buffer
		byte[] binary = new byte[fileStream.Length];
		fileStream.Read(binary, 0, (int)fileStream.Length);
		fileStream.Close();
		fileStream.Dispose();
		fileStream = null;

		return binary;
	

方法二：通使用 UnityWebRequest 加载本地图片文件

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class Demo : MonoBehaviour

	public Image _faceSearchImage;

	//根据路径或者URL读取本地文件并转换为Texture2D文件
	public void GetBookSprite(string url)
	
		StartCoroutine(DownSprite(url));
	

	IEnumerator DownSprite(string url)
	
		var uri = new System.Uri(Path.Combine(url));
		UnityWebRequest www = UnityWebRequest.Get(uri);
		DownloadHandlerTexture texDl = new DownloadHandlerTexture(true);
		www.downloadHandler = texDl;

		yield return www.SendWebRequest();

		if (www.isHttpError || www.isNetworkError)
		
			Debug.LogError(www.error);
		
		else
		
			Texture2D tex = new Texture2D(1, 1);
			tex = texDl.texture;
			Sprite sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f));
			_faceSearchImage.sprite = sprite;
		
	

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