public static void DownloadImages(string linkAddress, string saveToFolder)
{
Match matched = Regex.Match(linkAddress, @"(.*[\D])(\d+)(\.[jpengif]+)");
int failedCount = 0;
CallbackSucc cbOnDownloadData =
(isSUc) =>
{
if (isSUc == false)
{
failedCount++;
}
};
if (matched.Success)
{
Debug.Log("Yes. This is like a images web.");
//--Try to get link (www.xxx.com/blabla_)(number).(jpg/png)
//前缀：
string linkPrefix = matched.Groups[1].Value;
//中缀
//--序号字符串：（一般探测 +1，且保持这个长度）
string indexStr = matched.Groups[2].Value;
//后缀
string postFix = matched.Groups[3].Value;
//--获得序号的长度：（有可能为0001的形势）
string indexNameFormat = "{1:D" + indexStr.Length + "}";
int currIndex;
if (int.TryParse(indexStr, out currIndex))
{
#region 开始一个线程不断地开启任务
Thread threadDoAdd = new Thread(new ThreadStart(
() =>
{
//--缓步增加：
while (true)
{
//--每次组4次：
for (int i = 0; i < DOWNLOAD_FILE_STEP_COUNT; i++)
{
#region 开始这个下载：
//--构建下载名：
//填充为N位数保持格式
string link = string.Format("{0}" + indexNameFormat + "{2}", linkPrefix, currIndex, postFix);
Debug.Log("Will go to :" + link);
string fileName = saveToFolder + "/" + currIndex + postFix;
Debug.Log("File name :" + fileName);
DownloadWebData(link, fileName, cbOnDownloadData);
#endregion
currIndex++;
}
Thread.Sleep(1000 * 5);
if (failedCount >= DOWNLOAD_FILE_STEP_COUNT)
{
Debug.Log("Too many error , quit thread.");
Debug.LogToUser("看起来后面的没什么能下载的，应该下载完成了。");
break;
}
}
}));
threadDoAdd.Start();
#endregion
}
else
{
Debug.LogToUser(":( 看起来解析的地址出了点错误。");
}
}
else
{
Debug.LogToUser("看起来……这个网址不是图片的链接。");
}
}
/// <summary>
/// 下载一个内容：如果下载成功，则可能会回调该函数（取决回调与否）
/// </summary>
private static void DownloadWebData(string linkAddress, string FileNameToSave, CallbackSucc cbOnThreadFin = null)
{
bool isSuc = false;
Thread thread = new Thread(new ThreadStart(() =>
{
Debug.Log("Thread start to work at " + linkAddress);
//创建一个请求：
HttpWebRequest request = null;
HttpWebResponse response = null;
try
{
#region Do it
request = (HttpWebRequest)HttpWebRequest.Create(linkAddress);
//--开始获得结果：
response = (HttpWebResponse)request.GetResponse();
//--OK的情况下
if (response.StatusCode == HttpStatusCode.OK)
{
#region 获得数据
using (Stream stream = response.GetResponseStream())
{
StreamReader sr = null;
StreamWriter sw = null;
BinaryReader binaryReader = null;
BinaryWriter binaryWriter = null;
try
{
sr = new StreamReader(stream);
sw = new StreamWriter(FileNameToSave);
//--创建二进制流以进行写入读出
binaryReader =
new BinaryReader(sr.BaseStream);
binaryWriter =
new BinaryWriter(sw.BaseStream);
//--现在开始读入并写出：
byte[] buffer = new byte[BUFFER_SIZE];
int readCount = 0;
while (true)
{
//读入buffer
readCount = binaryReader.Read(buffer, 0, BUFFER_SIZE);
if (readCount <= 0)
{
Debug.Log("process done: " + FileNameToSave);
isSuc = true;
break;
}
//将Buffer内的内容写出：
binaryWriter.Write(buffer, 0, readCount);
}
}
catch (Exception ex)
{
Debug.Log("Shit... something wrong.");
}
finally
{
if (binaryReader != null)
{
binaryReader.Close();
}
if (binaryWriter != null)
{
binaryWriter.Close();
}
sw = null;
sr = null;
}
}
#endregion
}
#endregion
}
catch (Exception ex)
{
Debug.Log("[error]: " + ex);
}
finally
{
if (response != null)
{
response.Close();
}
//回调结果成功与否
if (cbOnThreadFin != null)
{
cbOnThreadFin(isSuc);
if (isSuc)
{
Debug.LogToUser("下载完了:" + FileNameToSave);
}
}
}
}
));
thread.Start();
}
