Unity C ＃ e-learning (10) -- unitywebrequest (2)

Unity C# E-learning （ Ten ）——UnityWebRequest（ Two ）

One .Unity Custom get data provided DownLoadHandler

Unity Help us define some related classes , The class used to parse the downloaded data , Use the corresponding class to handle the downloaded data , They will internally process the downloaded data into corresponding types , Easy to use

1.DownLoadHandlerBuffer（ For simple data storage , Get the corresponding binary data ）

private IEnumerator DownLoadBuffer()
{
    UnityWebRequest req = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/xxx.jpg",
        UnityWebRequest.kHttpVerbGET);
    DownloadHandlerBuffer downloadHandlerBuffer = new DownloadHandlerBuffer();
    req.downloadHandler = downloadHandlerBuffer;
    yield return req.SendWebRequest();
    if (req.result == UnityWebRequest.Result.Success)
    {
        byte[] buffer = downloadHandlerBuffer.data;
        Debug.Log(buffer.Length);
        Debug.Log(" Download successful !");
    }
    else
    {
        Debug.Log(" Download failed :"+req.result);
    }
}

2.DownLoadHandlerFile（ For downloading files and saving them to disk , Less memory usage ）

private IEnumerator DownLoadFile()
{
    UnityWebRequest req = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/xxx.jpg", UnityWebRequest.kHttpVerbGET);
    req.downloadHandler = new DownloadHandlerFile(Application.persistentDataPath + "/WebDownLoad.jpg");
    yield return req.SendWebRequest();
    Debug.Log(req.result);
}

3.DownLoadHandlerTexture（ For downloading pictures ）

private IEnumerator DownLoadTexture()
{
    UnityWebRequest req = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/xxx.jpg", UnityWebRequest.kHttpVerbGET);
    DownloadHandlerTexture downloadHandlerTexture = new DownloadHandlerTexture();
    req.downloadHandler = downloadHandlerTexture;
    yield return req.SendWebRequest();
    if (req.result == UnityWebRequest.Result.Success)
    {
        Debug.Log(downloadHandlerTexture.texture);
        Debug.Log(" Download successful !");
    }
    else
    {
        Debug.Log(" Download failed :"+req.result);
    }
}

4.DownLoadHandlerAssetBundle（ For extraction AssetBundle）

private IEnumerator DownLoadAssetBundle()
{
    UnityWebRequest req = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/photo.ywj", UnityWebRequest.kHttpVerbGET);
    DownloadHandlerAssetBundle downloadHandlerAssetBundle = new DownloadHandlerAssetBundle(req.url,0);
    req.downloadHandler = downloadHandlerAssetBundle;
    yield return req.SendWebRequest();
    if (req.result == UnityWebRequest.Result.Success)
    {
        Debug.Log(downloadHandlerAssetBundle.assetBundle.name);
        Debug.Log(" Download successful !");
    }
    else
    {
        Debug.Log(" Download failed :"+req.result);
    }
}

5.DownLoadHandlerAudioClip（ For downloading audio files ）

private IEnumerator DownLoadAudioClip()
{
    UnityWebRequest req = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/music.mp3", UnityWebRequest.kHttpVerbGET);
    DownloadHandlerAudioClip downloadHandlerAudioClip = new DownloadHandlerAudioClip(req.url,AudioType.MPEG);
    req.downloadHandler = downloadHandlerAudioClip;
    yield return req.SendWebRequest();
    if (req.result == UnityWebRequest.Result.Success)
    {
        Debug.Log(downloadHandlerAudioClip.audioClip);
        Debug.Log(" Download successful !");
    }
    else
    {
        Debug.Log(" Download failed :"+req.result);
    }
}

Two . Customize DownLoadHandler To process data

• When we need to expand the data , Can be inherited from DownloadHandlerScript Class to extend it

public class CustomDownLoadFileHandler : DownloadHandlerScript
{
    
    private string _savePath;
    private byte[] _cacheBytes;
    private int _index;
    public CustomDownLoadFileHandler() : base()
    {
    
    }
    public CustomDownLoadFileHandler(byte[] bytes) : base(bytes)
    {
    
        
    }
    public CustomDownLoadFileHandler(string path) : base()
    {
    
        this._savePath = path;
    }

    protected override byte[] GetData()
    {
    
        return _cacheBytes;
    }

    // After receiving data from the network , Methods that will be called at each frame 
    protected override bool ReceiveData(byte[] buffer, int dataLength)
    {
    
        buffer.CopyTo(_cacheBytes,_index);
        _index += dataLength;
        return true;
    }

    // Received... From server contentLength Header will call 
    protected override void ReceiveContentLengthHeader(ulong contentLength)
    {
    
        _cacheBytes = new byte[contentLength];
    }

    // The message has been received , Methods that will be called automatically 
    protected override void CompleteContent()
    {
    
        File.WriteAllBytes(_savePath,_cacheBytes);
    }
}

To test

private IEnumerator CustomDownLoadFile()
{
    UnityWebRequest unityWebRequest = new UnityWebRequest("http://192.168.1.103:8080/Http_Server/xxx.jpg",
        UnityWebRequest.kHttpVerbGET);
    unityWebRequest.downloadHandler = new CustomDownLoadFileHandler(Application.persistentDataPath+"/zzsCustom.jpg");
    yield return unityWebRequest.SendWebRequest();
    Debug.Log(unityWebRequest.result);
}

3、 ... and . Customize DownLoadHandler Exercise handling

public class DownLoadHandlerMsg : DownloadHandlerScript
{
    
    private byte[] _cacheBuffer;
    private int _index;
    private MsgBase _msgBase;
    public DownLoadHandlerMsg()
    {
    
        
    }

    public T GetMsg<T>() where T : MsgBase
    {
    
        return _msgBase as T;
    }

    protected override byte[] GetData()
    {
    
        return _cacheBuffer;
    }

    protected override void ReceiveContentLengthHeader(ulong contentLength)
    {
    
        _cacheBuffer = new byte[contentLength];
    }

    protected override bool ReceiveData(byte[] buffer, int dataLength)
    {
    
        buffer.CopyTo(_cacheBuffer,_index);
        _index += dataLength;
        return true;
    }

    protected override void CompleteContent()
    {
    
        int index = 0;
        int msgId = BitConverter.ToInt32(_cacheBuffer,index);
        index += 4;
        int msgLength = BitConverter.ToInt32(_cacheBuffer, index);
        index += 4;
        switch (msgId)
        {
    
            case 1001:
                _msgBase = new PlayerMsg();
                _msgBase.Reading(_cacheBuffer, index);
                break;
        }
        Debug.Log(_msgBase == null ? " news Id error !" : " Message parsing succeeded !");
    }
}

Test code

private IEnumerator Start()
{
    UnityWebRequest unityWebRequest = new UnityWebRequest("", UnityWebRequest.kHttpVerbGET);
    unityWebRequest.downloadHandler = new DownLoadHandlerMsg();
    yield return unityWebRequest.SendWebRequest();
    Debug.Log(unityWebRequest.result);
}