前言

一、導(dǎo)入AVpro插件

AVpro插件是一款很強(qiáng)大的視頻播放插件，配合Unity使用有意想不到的效果，他的各項(xiàng)功能網(wǎng)上都有，我就不進(jìn)行展開討論了。
該插件的獲取方式為AssetStore中購(gòu)買下載，該插件有一個(gè)免費(fèi)版本可供使用，付費(fèi)版本的功能強(qiáng)大一點(diǎn)。
有需要的也可以私信我，我分享給你，你只能用于學(xué)習(xí)，不可用于商用。

將下載好的AVpro導(dǎo)入U(xiǎn)nity。

二、插件對(duì)應(yīng)的UI界面

圖中顯示視頻的GUI主要是導(dǎo)入AVPro之后創(chuàng)建的，右鍵UI/AVproVideouGUI

在該GUI的Inspector窗口有一個(gè)Display uGui的組件，該組件中有一個(gè)MediaPlayer的選項(xiàng)，該選項(xiàng)是一個(gè)播放器，右鍵添加該播放器并且拉入到該位置。

三、創(chuàng)建ChangeVideo腳本

/****************************************************
    文件：ChangeVideo.cs
	作者：Mark
    日期：#CreateTime#
	功能：替換視頻
*****************************************************/

using RenderHeads.Media.AVProVideo;
using System.Collections;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
public class ChangeVideo : MonoBehaviour 
{
    public Button changeVideoBtn;  //替換視頻的按鈕
    public MediaPlayer mediaPlayer;//AVpro的播放器
    public DisplayUGUI displayUGUI;//AVpro的UGUI
    private string savePath = Application.streamingAssetsPath + "/1.mp4";//視頻加載后的保存位置
    private void Start()
    {
        changeVideoBtn.onClick.AddListener(onRead);//監(jiān)聽按鈕是否點(diǎn)擊，如果點(diǎn)擊就執(zhí)行打開窗口
    }
    private void onRead()
    {
        OpenFileName ofn = new OpenFileName();

        ofn.structSize = Marshal.SizeOf(ofn);

        ofn.filter = "視頻文件(*.mp4*.mov)\0*.mp4;*.mov";

        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('/', '\\');
        //默認(rèn)路徑
        ofn.initialDir = path;

        ofn.title = "選擇需要替換的視頻";

        ofn.defExt = "mp4";//顯示文件的類型
                           //注意 一下項(xiàng)目不一定要全選 但是0x00000008項(xiàng)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(Download(ofn.file));
        }

    }
    IEnumerator Download(string url)
    {
        mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.RelativeToStreamingAssetsFolder, null, false);
        UnityWebRequest request = UnityWebRequest.Get(url);
        request.SendWebRequest();
        if (request.isHttpError || request.isNetworkError)
        {
            //print("當(dāng)前的下載發(fā)生錯(cuò)誤" + request.error);
            yield break;
        }
        while (!request.isDone)
        {
            //獲取視頻讀取進(jìn)度，有需要可以加入
            //print("當(dāng)前的下載進(jìn)度為：" + request.downloadProgress);
            //downloadProgress.text = (request.downloadProgress * 100).ToString() + "%";
            yield return 0;
        }
        if (request.isDone)
        {
            //downloadProgress.text = "100%";
            using (FileStream fs = new FileStream(savePath, FileMode.Create))
            {
                byte[] results = request.downloadHandler.data;
                fs.Write(results, 0, results.Length);
                fs.Flush();
                fs.Close();
            }
        }
        mediaPlayer.OpenVideoFromFile(MediaPlayer.FileLocation.RelativeToStreamingAssetsFolder, savePath, false);
        //加載成功后打開并且播放
        mediaPlayer.m_AutoOpen = true;
        mediaPlayer.Play();
    }

}

四、創(chuàng)建OpenFileName類用于打開窗口

/****************************************************
    文件：OpenFileName.cs
	作者：Mark
    日期：#CreateTime#
	功能：打開文件夾
*****************************************************/

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);
    }
}

五、掛載腳本并且運(yùn)行

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