unity3d 关于断点下载和整个下载(用于更新)

string t = "";

//总体下载

IEnumerator downfile(string url, string LocalPath,UILabel DesLable)

{

Uri u = new Uri(url);

HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(u);

mRequest.Method = "GET";

mRequest.ContentType = "application/x-www-form-urlencoded";

HttpWebResponse wr = (HttpWebResponse)mRequest.GetResponse();

Stream sIn = wr.GetResponseStream();

FileStream fs = new FileStream(LocalPath, FileMode.Create, FileAccess.Write);

long length = wr.ContentLength;

long i = 0;

decimal j = 0;

while (i < length)

{

byte[] buffer = new byte[1024];

i += sIn.Read(buffer, 0, buffer.Length);

fs.Write(buffer, 0, buffer.Length);

if ((i % 1024) == 0)

{

j = Math.Round(Convert.ToDecimal((Convert.ToDouble(i) / Convert.ToDouble(length)) * 100), 4);

t= "当前下载文件大小:" + length.ToString() + "字节 当前下载大小:" + i + "字节 下载进度" + j.ToString() + "%";

DesLable.text=t.ToString();

}

else

{

t = "当前下载文件大小:" + length.ToString() + "字节 当前下载大小:" + i + "字节";

DesLable.text=t.ToString();

}

yield return false;

}

sIn.Close();

wr.Close();

fs.Close();

}

string
downloadString="已经下载";

//断点下载

IEnumerator FPointDown(string uri,string saveFile,UILabel DesLable,UISprite LoadSprite)

{

//打开网络连接

System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri);

System.Net.HttpWebRequest requestGetCount = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(uri);

long countLength = requestGetCount.GetResponse().ContentLength;

//打开上次下载的文件或新建文件

long lStartPos = 0;

System.IO.FileStream fs;

if (System.IO.File.Exists(saveFile))

{

fs = System.IO.File.OpenWrite(saveFile);

lStartPos = fs.Length;

if (countLength - lStartPos <= 0)

{

fs.Close();

t = "已经";

DesLable.text=t.ToString();

yield break;

}

fs.Seek(lStartPos, System.IO.SeekOrigin.Current); //移动文件流中的当前指针

}

else

{

fs = new System.IO.FileStream(saveFile, System.IO.FileMode.Create);

}

if (lStartPos > 0)

{

request.AddRange((int)lStartPos); //设置Range值

print(lStartPos);

}

//向server请求。获得server回应数据流

System.IO.Stream ns = request.GetResponse().GetResponseStream();

int len = 1024 * 8;

byte[] nbytes = new byte[len];

int nReadSize = 0;

nReadSize = ns.Read(nbytes, 0, len);

while (nReadSize > 0)

{

fs.Write(nbytes, 0, nReadSize);

nReadSize = ns.Read(nbytes, 0, len);

t = downloadString+" : " + fs.Length / 1024 + "kb /" + countLength / 1024 + "kb"+" ---- "+((double)fs.Length/countLength).ToString()+"%";

yield return false;

}

ns.Close();

fs.Close();

//这里放更新安装代码,或者能够測试这个下载的包有没有出错,验证sha和md5

}