// 同步下载文件
public static byte[] downloadFile(string url, int offset = 0, byte[] helperBytes = null, string fileName = "",
StartDownloadCallback startCallback = null, DownloadingCallback downloading = null)
{
logInfo("开始http下载:" + url, LOG_LEVEL.LL_FORCE);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.AddRange(offset);
WebResponse response = request.GetResponse();
long fileSize = response.ContentLength + offset;
// response.ContentLength只是剩余需要下载的长度,需要加上下载起始偏移才是文件的真实大小
startCallback?.Invoke(fileName, fileSize);
Stream inStream = response.GetResponseStream();// 获取http
MemoryStream downloadStream = new MemoryStream();
if(helperBytes == null)
{
helperBytes = new byte[1024];
}
int readCount;
do
{
// 从输入流中读取数据放入内存中
readCount = inStream.Read(helperBytes, 0, helperBytes.Length);// 读流
downloadStream.Write(helperBytes, 0, readCount);// 写流
downloading?.Invoke(fileName, fileSize, downloadStream.Length);
} while (readCount > 0);
byte[] dataBytes = downloadStream.ToArray();
downloadStream.Close();
inStream.Close();
response.Close();
logInfo("http下载完成:" + url, LOG_LEVEL.LL_FORCE);
return dataBytes;
}
public void download(string fullURL, string fileName, long offset, DownloadingCallback downloading, TimeoutCallback timeout, StartCallback start, FinishCallback finish)
{
mDownloadListLock.waitForUnlock();
DownloadInfo info = new DownloadInfo();
// 下载地址里需要将空格替换为%20
info.mURL = StringUtility.strReplaceAll(fullURL, " ", "%20");
info.mFileName = fileName;
info.mDownloadingCallback = downloading;
info.mStartCallback = start;
info.mFinishCallback = finish;
info.mTimeoutCallback = timeout;
info.mDownloadOffset = offset;
mDownloadList.Add(info);
mDownloadListLock.unlock();
}
