【Unity3d】【項目學習心得】從資源服務器下載資源(三)

 

【Unity3d】【項目學習心得】從資源服務器下載資源(三)

上一篇我們分析了 從資源服務器下載資源(二)  接下來我們繼續分析 LoadManager類。

當我們的任務下載完成後，我們需要對任務的委託進行回調到調用對象。

我們初步加入的委託有 complete、process、error ，接下來分別對這三個委託寫相應的回調。

/// <summary>
///  下載錯誤回調
/// </summary>
public void ErrorDelegateHandle(LoadRequest request) {
    if (request.errorFunction != null) {
        int count = request.errorFunction.GetInvocationList().GetLength(0);
        for (int i = 0; i < count; i++) {
            LoadRequest.ErrorDelegate errorFunc = (LoadRequest.ErrorDelegate)request.errorFunction.GetInvocationList()[i];
            try {
                errorFunc.Invoke(request);
            } catch (Exception e) {
                Debug.LogWarning("exception:" + e.Message);
            }
        }
    }
}

/// <summary>
///  下載進度回調
/// </summary>
public void ProcessDelegateHandle(LoadRequest request) {
    if (request.processFunction != null) {
        int count = request.processFunction.GetInvocationList().GetLength(0);
        for (int i = 0; i < count; i++) {
            LoadRequest.ProcessDelegate processFunc = (LoadRequest.ProcessDelegate)request.processFunction.GetInvocationList()[i];
            try {
                processFunc.Invoke(request.wwwObject.progress, request.wwwObject.bytesDownloaded);
            } catch (Exception e) {
                Debug.LogWarning("exception:" + e.Message);
            }
        }
    }
}

/// <summary>
///  任務下載完成回調
/// </summary>
/// <param name="request"></param>
/// <param name="param"></param>
public void CompleteDelegateHandle(LoadRequest request, LoadParam param) {
    if (request.completeFunction != null) {
        int count = request.completeFunction.GetInvocationList().GetLength(0);
        for (int i = 0; i < count; i++) {
            if (i < request.customParams.Count) {
                param.param = request.customParams[i];
            }
            LoadRequest.DownCompleteDelegate completeFunc = (LoadRequest.DownCompleteDelegate)request.completeFunction.GetInvocationList()[i];
            try {
                completeFunc.Invoke(param);
            } catch (Exception exception) {
                Debug.LogWarning("exception:" + exception.Message);
            }
        }
    }
}

1. 在上面我們注意到有一個陌生的類 LoadParam. 這個類是用來做什麼的呢？

很簡單，因爲我們下載完成後會進行存儲所有的下載結果，方便後續下載相同資源時可以馬上調用。所以我們需要專門的對象來存放。

我們把所有類型寫到一個類裏面，然後標註好該對象的對應URL、filetype。

如下：

/**
 * 任務下載的資源
 * create by chensh 2014.10.27 10:35
 */

using UnityEngine;
using System.Collections;


namespace AssemblyCSharp {
    public class LoadParam {
        // 加載的文件類型
        public string fileType;
        // 加載的路徑
        public string url;

        // 自定義參數
        public object param = null;
        // 圖片
        public Texture2D texture2D;
        // 文本
        public string text = "";
        // unity3d格式文件，目前針對場景打包的unity3d格式文件
        public AssetBundle assetBundle = null;
        // json文件
        public string jsonData;
        // 二進制文件
        public byte[] byteArr;
        // 音頻文件
        public AudioClip audioClip;
        // 模塊資源打包格式文件
        public UIAtlas uiAtlas;
        // fbx打包的文件對象
        public UnityEngine.Object mainAsset;
        // font文件
        public UIFont font;

    }
}

2. 此時我們需要一個函數。來解析下載完後的資源，並保存到 LoadParam 中。

/// <summary>
    ///  解析下載內容
    /// </summary>
    public LoadParam ParseLoadParamFromLoadRequest(LoadRequest request) {
        LoadParam param = new LoadParam();
        param.url = request.requestURL;
        param.priority = request.priotiry; // 爲何param需要記錄優先級？
        param.fileType = request.fileType;

        switch (request.fileType) {
            case LoadFileType.IMAGE:
                try {
                    param.texture2D = request.wwwObject.texture;
                    param.texture2D.Compress(false);    // compress 有何影響
                } catch (Exception exception) {
                    Debug.LogWarning("read texture2d error:" + request.requestURL +"\n" + exception.Message);
                }
                break;
            case LoadFileType.TXT:
                try {
                    param.text = request.wwwObject.text;
                } catch (Exception exception) {
                    Debug.LogWarning("read text error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.UNITY3D:
                try {
                    if (request.wwwObject.assetBundle != null) {
                        param.assetBundle = request.wwwObject.assetBundle;
                    }
                } catch (Exception exception) {
                    Debug.LogWarning("read assetBundle error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.MODULE_RESOURCE:
                try {
                    UnityEngine.Object[] data = request.wwwObject.assetBundle.LoadAll();
                    int length = data.Length;
                    for (int i = 0; i < length; i++) {
                        if (data[i] is GameObject) {
                            param.uiAtlas = (data[i] as GameObject).GetComponent<UIAtlas>();
                            break;
                        }
                    }
                    request.wwwObject.assetBundle.Unload(false);
                } catch (Exception exception) {
                    Debug.LogWarning("read uiatlas error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.JSON:
                try {
                    param.jsonData = request.wwwObject.text.Trim();
                } catch (Exception exception) {
                    Debug.LogWarning("read  json error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.FBX:
                try {
                    param.mainAsset = request.wwwObject.assetBundle.mainAsset;
                } catch (Exception exception) {
                    Debug.LogWarning("read  fbx error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.BINARY:
            case LoadFileType.BINARY_BG:
                try {
                    param.byteArr = request.wwwObject.bytes;
                } catch (Exception exception) {
                    Debug.LogWarning("read  binary error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.AUDIO:
                try {
                    UnityEngine.Object[] data = request.wwwObject.assetBundle.LoadAll();
                    int length = data.Length;
                    for (int i = 0; i < length; i++) {
                        if (data[i] is AudioClip) {
                            param.audioClip = data[i] as AudioClip;
                            break;
                        }
                    }
                    request.wwwObject.assetBundle.Unload(false);
                } catch (Exception exception) {
                    Debug.LogWarning("read audio error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
            case LoadFileType.FONT:
                try {
                    UnityEngine.Object[] data = request.wwwObject.assetBundle.LoadAll();
                    int length = data.Length;
                    for (int i = 0; i < length; i++) {
                        if (data[i] is UnityEngine.Transform) {
                            param.font = (data[i] as UnityEngine.Transform).GetComponent<UIFont>();
                            break;
                        }
                    }
                    request.wwwObject.assetBundle.Unload(false);
                } catch (Exception exception) {
                    Debug.LogWarning("read  font error:" + request.requestURL + "\n" + exception.Message);
                }
                break;
        }
        return param;
    }

3.我們發現，似乎還沒有對下載隊列進行檢測，即檢測WWW類下載的狀態。是已經下載完成了呢，還是下載出錯。

這個時候我們需要一個定時器。

每隔一定時間對下載隊列進行檢測，我們在構造函數那裏添加一個定時器。

public LoadManager() {
       Application.backgroundLoadingPriority = ThreadPriority.Low;
       // add timer to check download queue
       FrameTimerManager.getInstance().add(1, 0, CheckQueue);
   }

其中的 CheckQueue() 函數是檢測函數。

/// <summary>
    ///  定時器下，在每幀對下載隊列進行檢測
    ///  如果下載有問題，或者超時，則清除
    ///  如果下載完成，則解析下載結果，並進入completeDict中
    /// </summary>
    public void CheckQueue() {
        if (!isLoading) return;
        foreach (KeyValuePair<string, LoadRequest> pair in loadDict) {
            LoadRequest request = pair.Value;
            request.loadTotalFrames++;
            // deal error
            if ((request.wwwObject != null && request.wwwObject.error != null) || request.isTimeOut) {
                if (request.requestURL.Contains(".apk") || request.requestURL.Contains(".ipa")) {
                    return;
                }
                request.alreadyDeal = true;
                loadDict.Remove(request.requestURL);
                ErrorDelegateHandle(request);
                if (request.isTimeOut) {
                    Debug.LogWarning("Load time out:" + request.requestURL);
                } else {
                    Debug.LogWarning("Load error:" + request.requestURL);
                }
                MoveRequestFromWaitDictToLoadDict();
                break;
            }

            //
            if (!request.alreadyDeal) {
                ProcessDelegateHandle(request);
                // if done
                if (request.wwwObject != null && request.wwwObject.isDone) {
                    LoadParam param = ParseLoadParamFromLoadRequest(request);
                    if (request.fileType != LoadFileType.BINARY) {
                        completeDict.Add(request.requestURL, param);
                    }
                    //
                    CompleteDelegateHandle(request, param);
                    //
                    request.alreadyDeal = true;
                    loadDict.Remove(request.requestURL);
                    MoveRequestFromWaitDictToLoadDict();
                    break;
                }
            }

        }
    }

至此，我們的LoadManager類即完成相應的功能。

轉載：http://blog.csdn.net/mad2man/article/details/40584039