Vuforia官网
XAMPP官网
SharpZipLib
截止目前，Vuforia SDK版本为8.1.7，已内置与Unity引擎内。
经常会遇到项目需要动态的增删改识别图，使用云识别上成本又比较高，在识别图体量还不是特别多的情况，利用动态的加载Dataset可以很好的实现识别图的热更新。
1.下载数据包，部署于本地服务器
本次示例通过压缩包形式，在下载数据包是选择下图选项，得到压缩格式的数据包，直接将压缩包部署本地或服务器，省去了下载unitypackge形式还得导入引擎内取出数据包的过程。
这里应用了集成服务器环境XAMPP，一键式安装，开箱即用，局域网直接访问，比lamp server好用不要太多。安装完毕后开启Apache服务，并等待启动成功，随后可自行访问本机的内网IP进行测试，正常情况下你会看到这个XAMPP的默认页面。
进入XAMPP的安装目录进入htdocs文件夹内的dashboard，将数据包放入。并在浏览器内输入路径 内网ip/dashboard/数据包名.zip 如http://192.168.0.108/dashboard/Test.zip 确认数据包URL访问正常。这里需要注意的是Android平台9.0以上的系统，也就是Andorid P会报出Cleartext HTTP traffic to xxx not permitted。会出现无法请求HTTP的资源，HTTPS请求则不会受影响。这里比较简单的解决办法是在Player Settings内设置Target API level版本在API Level28以下,比如Level27 Android 8.1。
2.引用第三方解压库SharpZipLib
在Github内选择releases内下载最新版本，通过压缩文件打开找到其Dll文件，选择并导入合适.NET版本的到Unity内，使用时直接引入命名空间ICSharpCode.SharpZipLib.Zip，并封装对应的解压到指定目录的方法。
3.下载数据包，进行解压并加载
填入数据包的URL地址进行下载，下载完成后解压到沙盒路径内，通过激活数据包来完成识别图的动态加载。代码如下
using ICSharpCode.SharpZipLib.Zip;
using System;
using System.IO;
public class FileDecompression {
/// <summary>
/// 解压功能(下载后直接解压压缩文件到指定目录)
/// </summary>
/// <param name="path">解压目标路径</param>
/// <param name="ZipByte">原始数据</param>
/// <param name="password">解压密码</param>
/// <returns></returns>
public static string SaveZip(string path,byte[] ZipByte,string password = null) {
string result = null;
FileStream fs = null;
ZipInputStream zipStream = null;
ZipEntry ent = null;
string fileName;
if(!Directory.Exists(path)) {
Directory.CreateDirectory(path);
}
try {
//直接使用 将byte转换为Stream，省去先保存到本地在解压的过程
Stream stream = new MemoryStream(ZipByte);
zipStream = new ZipInputStream(stream);
if(!string.IsNullOrEmpty(password)) {
zipStream.Password = password;
}
while((ent = zipStream.GetNextEntry()) != null) {
if(!string.IsNullOrEmpty(ent.Name)) {
fileName = Path.Combine(path,ent.Name);
#region Android
fileName = fileName.Replace('\\','/');
if(fileName.EndsWith("/")) {
Directory.CreateDirectory(fileName);
continue;
}
#endregion
fs = File.Create(fileName);
int size = 2048;
byte[] data = new byte[size];
while(true) {
size = zipStream.Read(data,0,data.Length);
if(size > 0) {
//fs.Write(data, 0, data.Length);
fs.Write(data,0,size);//解决读取不完整情况
}
else
break;
}
}
}
}
catch(Exception e) {
result = e.Message;
}
finally {
if(fs != null) {
fs.Close();
fs.Dispose();
}
if(zipStream != null) {
zipStream.Close();
zipStream.Dispose();
}
if(ent != null) {
ent = null;
}
GC.Collect();
GC.Collect(1);
}
return result;
}
}
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;
public class DownloadUtlitile {
public static IEnumerator DownloadDataset(string url,Action<byte[]> succeedAction,Action<string> failedAction) {
UnityWebRequest unityWebRequest = UnityWebRequest.Get(url);
yield return unityWebRequest.SendWebRequest();
if(unityWebRequest.isDone && string.IsNullOrEmpty(unityWebRequest.error)) {
succeedAction.Invoke(unityWebRequest.downloadHandler.data);
}
else {
failedAction.Invoke(unityWebRequest.error);
}
}
}
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using Vuforia;
public class LoadDataset:MonoBehaviour {
public string url;
public Material material;
// Start is called before the first frame update
void Start() {
VuforiaARController.Instance.RegisterVuforiaStartedCallback(()=> {
LoadDataSetForUrl(url);
});
}
private void LoadDataSetForUrl(string url) {
int startIndex = url.LastIndexOf("/") + 1;
int conut = url.LastIndexOf(".") - startIndex;
string zipName = url.Substring(startIndex,conut);
string filePath = string.Format("{0}/{1}/{2}",Application.persistentDataPath,"dataset",zipName);
string xmlPath = string.Format("{0}/{1}.xml",filePath,zipName);
print(filePath);
if(Directory.Exists(filePath)) {
LoadDataSet(xmlPath);
}
else {
StartCoroutine(DownloadUtlitile.DownloadDataset(url,a => {
print("下载成功");
if(string.IsNullOrEmpty(FileDecompression.SaveZip(filePath,a))) {
print("解压成功");
LoadDataSet(xmlPath);
}
else {
print("解压失败");
}
},a => {
print("下载异常:" + a);
}));
}
}
private void LoadDataSet(string path) {
ObjectTracker tracker = TrackerManager.Instance.GetTracker<ObjectTracker>();
DataSet dataSet = tracker.CreateDataSet();
if(dataSet.Load(path,VuforiaUnity.StorageType.STORAGE_ABSOLUTE)) {
tracker.Stop();
if(!tracker.ActivateDataSet(dataSet)) {
Debug.Log("<color=yellow>Failed to Activate DataSet: " + path + "</color>");
}
if(!tracker.Start()) {
Debug.Log("<color=yellow>Tracker Failed to Start.</color>");
}
IEnumerable<TrackableBehaviour> trackableBehaviours = TrackerManager.Instance.GetStateManager().GetTrackableBehaviours();
foreach(TrackableBehaviour trackableBehaviour in trackableBehaviours) {
trackableBehaviour.gameObject.name = trackableBehaviour.TrackableName;
trackableBehaviour.gameObject.AddComponent<DefaultTrackableEventHandler>();
trackableBehaviour.gameObject.AddComponent<TurnOffBehaviour>();
GameObject gameObject = GameObject.CreatePrimitive(PrimitiveType.Cube);
gameObject.GetComponent<MeshRenderer>().material = material;
gameObject.transform.parent = trackableBehaviour.gameObject.transform;
gameObject.transform.localPosition = Vector3.zero;
gameObject.transform.localRotation = Quaternion.identity;
gameObject.transform.localScale = Vector3.one * 0.5f;
}
}
else {
Debug.LogError("<color=yellow>Failed to load dataset: '" + path + "'</color>");
}
}
}
