void Start(DownloadTask task)
{
m_Task = task;
m_Task.Status = DownloadTaskStatus.Doing;
try
{
if (File.Exists(downloadFile))
{
m_FileStream = File.OpenWrite(downloadFile);
m_FileStream.Seek(0, SeekOrigin.End);
m_StartLength = m_SaveLength = (int)m_FileStream.Length;
}
else
{
string directory = Path.GetDirectoryName(m_Task.DownloadPath);
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
m_FileStream = new FileStream(downloadFile, FileMode.Create, FileAccess.Write;
}
if (DownloadAgentStart != null) {
DownloadAgentStart(this);
}
if (m_StartLength > 0) {
m_Helper.Download(m_Task.DownloadUri, m_StartLength, m_Task.UserData);
}
}
catch (Exception exception) {
OnDownloadAgentHelperError(this, new DownloadAgentHelperErrorEventArgs(exception.Message));
}
}
/// <summary>
/// 增加下载任务。
/// </summary>
/// <param name="downloadPath">下载后存放路径。</param>
/// <param name="downloadUri">原始下载地址。</param>
/// <param name="priority">下载任务的优先级。</param>
/// <param name="userData">用户自定义数据。</param>
/// <returns>新增下载任务的序列编号。</returns>
public int AddDownload(string downloadPath, string downloadUri, int priority, object userData)
{
if (string.IsNullOrEmpty(downloadPath))
{
throw new GameFrameworkException("Download path is invalid.");
}
if (string.IsNullOrEmpty(downloadUri))
{
throw new GameFrameworkException("Download uri is invalid.");
}
if (TotalAgentCount <= 0)
{
throw new GameFrameworkException("You must add download agent first.");
}
DownloadTask downloadTask = DownloadTask.Create(downloadPath, downloadUri, priority, m_FlushSize, m_Timeout, userData);
m_TaskPool.AddTask(downloadTask);
return(downloadTask.SerialId);
}