public static DownloadManagerHelper GetDownloadManagerHelper()
{
if (instance == null)
{
instance = (new GameObject("DownloadManagerHelper")).AddComponent <DownloadManagerHelper>();
}
return(instance);
}
/// <summary>
/// 开始下载文件
/// </summary>
/// <param name="isRange">是否采用断点续传的方式进行下载</param>
public void StartDownload(bool isRange = true)
{
if (IsDone)
{
return;
}
if (URL == null || "".Equals(URL))
{
SystemErrorMsg = "URL不能为空";
CompletedFinally();
return;
}
if (SavePath == null || "".Equals(SavePath))
{
SystemErrorMsg = "保存路径不能为空";
CompletedFinally();
return;
}
UnityWebRequest = new UnityWebRequest(URL, Method);
IsRange = isRange;
//如果下载目录不存在，则创建目录及其父目录
if (!FileTools.DirectoryExists(SavePath))
{
try
{
FileTools.CreateDirectory(SavePath);
}
catch (System.UnauthorizedAccessException)
{
SystemErrorMsg = "没有权限";
CompletedFinally();
return;
}
catch (System.IO.IOException)
{
SystemErrorMsg = "目录路径有误";
CompletedFinally();
return;
}
catch (System.Exception e)
{
SystemErrorMsg = e.Message;
CompletedFinally();
return;
}
}
//如果没有设置文件名称，则通过URL来确定临时文件名称
string tempName = null;
try
{
tempName = SaveName == null?FileTools.GetFileName(URL).Split('?')[0] : SaveName;
}
catch (System.ArgumentException)
{
//如果无法通过URL获取到下载名称,则通过HashCode来确定名称
tempName = ((uint)URL.GetHashCode()).ToString();
}
TempFilePath = FileTools.PathCombine(SavePath, tempName);
TempFilePath += ".temp";
try
{
if (!IsRange && FileTools.FileExists(TempFilePath))
{
FileTools.DeleteFile(TempFilePath);
}
}
catch (System.Exception e)
{
SystemErrorMsg = e.Message;
CompletedFinally();
return;
}
try
{
DownloadHandlerRange = new DownloadHandlerRange(TempFilePath, UnityWebRequest);
DownloadHandlerRange.StartDownloadEvent += StartDownloadCallBack;
}
catch (System.IO.IOException)
{
SystemErrorMsg = "文件正在被下载";
CompletedFinally();
return;
}
catch (System.Exception e)
{
SystemErrorMsg = e.Message;
CompletedFinally();
return;
}
UnityWebRequest.downloadHandler = DownloadHandlerRange;
#if UNITY_2017_2_OR_NEWER
UnityWebRequest.SendWebRequest().completed += Download_completed;
#else
UnityWebRequest.Send();
DownloadManagerHelper.GetDownloadManagerHelper().StartCoroutine(JudgmentCompleted());
#endif
}