ProtoBuf在Unity3D中的简单使用！

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目前Unity3D依然是移动手机开发的主流开发工具。

而在移动端推荐的打包解包方法是使用Protobuf协议：主要优点就是效率高，传输量小，节省带宽。而想要在Android和IOS端都能使用Protobuf，我使用的方法是把Protobuf-net源代码拷贝到项目中的Scripts文件夹中，而当拷贝到文件夹时会出现如下错误。（文章结尾附有源代码）

我们只需要在Assets目录下创建smcs.rsp文件，并在文件中写入-unsafe，重新编译，即可发现错误消失。

这样前期配置工作就完成了，下面就是简单的编码部分。

1、首先创建一个cs文件，命名为Person.cs，具体源码如下

[ProtoContract]public class Person {    [ProtoMember(1)]    public int Id { get; set; }    [ProtoMember(2)]    public string Name { get; set; }    [ProtoMember(3)]    public Address Address { set; get; }    public override string ToString()    {        return "Id = " + Id + " " + "Name = " + Name + " " + "Address = " + Address;    }}[ProtoContract]public class Address{    [ProtoMember(1)]    public string Line1 { get; set; }    [ProtoMember(2)]    public string Line2 { get; set; }    public override string ToString()    {        return "Line1 = " + Line1 + " " + "Line2 = " + Line2;    }}

2、在项目中创建一个Test.cs文件，并挂载到Main Camera上

public class Test : MonoBehaviour{    List<Person> persons = new List<Person>();    void Start()    {        Person p1 = new Person()        {            Address = new Address() {Line1 = "one line address", Line2 = "two line address"},            Id = 1,            Name = "肖明"        };        Person p2 = new Person() {Address = new Address() {Line1 = "one line", Line2 = "two line"}, Id = 1, Name = "肖红"};        persons.Add(p1);        persons.Add(p2);        using (var file = File.Create("test.bin"))//把对象序列化到文件中        {            Serializer.Serialize(file,persons);        }    }     void OnGUI()    {        if (GUILayout.Button("反序列化"))        {            Deserialize();        }    }    void Deserialize()    {        List<Person> personList =new List<Person>();        using (var file = File.OpenRead("test.bin"))        {            personList = Serializer.Deserialize<List<Person>>(file);        }        foreach (var person in personList)        {            Debug.Log(person);        }    }}

3、运行程序，你会发现在你的项目根目录中有一个test.bin文件，里面就存放的是我们被序列化的对象

4、点击场景中的反序列化Button，，会看到输出了如下字符串

5、我简单写了一个protobuf工具类，主要提供把对象序列化到文件或者内存中去，和把文件或者内存中的数据反序列化出来，下面是主要源代码

public class ProtobufHelper{    /// <summary>    /// 把对象序列化到内存中    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="t"></param>    /// <returns></returns>    public static string Serialize<T>(T t)    {        using (MemoryStream ms = new MemoryStream())        {            Serializer.Serialize(ms, t);            return Encoding.UTF8.GetString(ms.ToArray());        }    }    /// <summary>    /// 把对象序列化到文件中    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="path"></param>    /// <param name="t"></param>    public static void Serialize<T>(string path, T t)    {        using (var file = File.Create(path))        {            Serializer.Serialize(file,t);        }    }    /// <summary>    /// 把对象从内存中反序列化回来    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="content"></param>    /// <returns></returns>    public static T Deserialize<T>(string content)    {        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(content)))        {            T t = Serializer.Deserialize<T>(ms);            return t;        }    }    /// <summary>    /// 把对象从文件中反序列化回来    /// </summary>    /// <typeparam name="T"></typeparam>    /// <param name="s"></param>    /// <returns></returns>    public static T Deserialize<T>(Stream s)    {        return Serializer.Deserialize<T>(s);    }}

6、下面是这个类的简单实用方法（把数据序列化到内存中，并把对象从内存中反序列化回来），在Test.cs修改代码如下

public class Test : MonoBehaviour{    List<Person> persons = new List<Person>();    string strResult = String.Empty;    void Start()    {        Person p1 = new Person()        {            Address = new Address() {Line1 = "one line address", Line2 = "two line address"},            Id = 1,            Name = "肖明"        };        Person p2 = new Person() {Address = new Address() {Line1 = "one line", Line2 = "two line"}, Id = 1, Name = "肖红"};        persons.Add(p1);        persons.Add(p2);        strResult = ProtobufHelper.Serialize(persons);//序列化到内存中    }     void OnGUI()    {        if (GUILayout.Button("反序列化"))        {            Deserialize();        }    }    void Deserialize()    {        List<Person> personList =new List<Person>();        personList = ProtobufHelper.Deserialize<List<Person>>(strResult);从内存中反序列化出来        foreach (var person in personList)        {            Debug.Log(person);        }    }}

7、下面是把数据序列化到文件中，并把对象从文件中反序列化回来，在Test.cs修改代码如下

public class Test : MonoBehaviour{    List<Person> persons = new List<Person>();    private string path;    void Start()    {        path = Application.streamingAssetsPath + "/test.bin";        Person p1 = new Person()        {            Address = new Address() {Line1 = "one line address", Line2 = "two line address"},            Id = 1,            Name = "肖明"        };        Person p2 = new Person() {Address = new Address() {Line1 = "one line", Line2 = "two line"}, Id = 1, Name = "肖红"};        persons.Add(p1);        persons.Add(p2);        ProtobufHelper.Serialize<List<Person>>(path,persons);//把对象序列化到文件中    }     void OnGUI()    {        if (GUILayout.Button("反序列化"))        {            Deserialize();        }    }    void Deserialize()    {        List<Person> personList =new List<Person>();        using (var file = File.OpenRead(path))//从文件中读取        {            personList = ProtobufHelper.Deserialize<List<Person>>(file);        }        foreach (var person in personList)        {            Debug.Log(person);        }    }}

8.这就是一个简单的Protobuf序列化与反序列化介绍，我附上protobuf-net源代码供大家下载

链接：http://pan.baidu.com/s/1kUBZDYZ 密码：4b01

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