Unity使用 WWW + URL 下載&讀取圖片

本篇要介紹在Unity使用WWW下載&讀取圖片到手機或是電腦裡。

一、設定圖片存放的位置

//指定到對應環境的路徑
public class utilPath
{
#if (UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN)
    public static string LOCAL_PATH = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
#elif (UNITY_ANDROID)
    public static string LOCAL_PATH = Application.persistentDataPath;
#endif 
}

//設定要存放的路徑(ImageCache跟Image可以自定義名稱)
public string path
{
#if (UNITY_EDITOR_WIN || UNITY_STANDALONE_WIN)
        get { return utilPath.LOCAL_PATH + "\\ImageCache\\"; }
#elif (UNITY_ANDROID)
        get { return utilPath.LOCAL_PATH + "/Image/"; }
#endif
}

二、檢查圖片是否要下載或是讀取

public void SetAsyncImage(string mPath ,string imageName, UITexture bantexture)
{
  //下載的url路徑
  url = mPath;
  //檢查檔案是否存在 (bantexture 畫面中顯示圖片的物件)
  if (!File.Exists(path + imageName))
     StartCoroutine(DownloadImage(imageName, bantexture));
  else
     StartCoroutine(LoadLocalImage(imageName, bantexture));
}

三、下載圖片

IEnumerator DownloadImage(string imageName, UITexture bantexture)
{
  //url跟imageName是網路上的路徑跟圖檔名稱(ex:http://127.0.0.1/image/apple.jpg)
  WWW www = new WWW("http://" + url + imageName);
  yield return www;

  if (!string.IsNullOrEmpty(www.error))
     bantexture.mainTexture = Resources.Load("Picture/error") as Texture;
  else{
     Texture2D tex2d = www.texture;
     byte[] pngdata = tex2d.EncodeToJPG();
     File.WriteAllBytes(path + imageName , pngdata);  //寫入圖檔

     bantexture.mainTexture = tex2d;  //回傳給要顯示的物件
  }
}

四、讀取圖片

IEnumerator LoadLocalImage(string name, UITexture bantexture)
{
  string FilePath = "file:///" + path + name;
  //本地端的檔案路徑
  WWW www = new WWW(FilePath);
  yield return www;

  Texture2D tex2d = www.texture;

  bantexture.mainTexture = tex2d;
}

以上就是下載&讀取圖片的使用，有問題的話歡迎底下留言!!!