private List <NeedOtaFile> CheckOtaFiles(List <OtaFile> listOtaFiles)
{
if (listOtaFiles == null)
{
return(null);
}
List <NeedOtaFile> needOtaFiles = new List <NeedOtaFile>();
for (var i = 0; i < listOtaFiles.Count; i++)
{
OtaFile otaFile = listOtaFiles[i];
NeedOtaFile needOtaFile = new NeedOtaFile();
needOtaFile.fileName = otaFile.FileName;
needOtaFile.otaUrl = otaFile.DownloadUrl;
needOtaFile.localPath = otaFile.RelativePath.TrimStart('\\');
needOtaFile.md5 = otaFile.FileMd5;
if (!needOtaFile.CheckMd5())
{ //需要更新
needOtaFile.index = needOtaFiles.Count;
needOtaFiles.Add(needOtaFile);
}
}
return(needOtaFiles);
}
private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
NeedOtaFile needOtaFile = e.Argument as NeedOtaFile;
if (needOtaFile == null)
{
return;
}
DownLoad(needOtaFile);
e.Result = needOtaFile.index + 1;
}
/// <summary>
/// 下载方法
/// </summary>
private void DownLoad(NeedOtaFile needOtaFile)
{
if (needOtaFile == null)
{
throw new ArgumentNullException(nameof(needOtaFile));
}
//比如uri=http://localhost/Rabom/1.rar;iis就需要自己配置了。
string uri = needOtaFile.otaUrl;
//截取文件名
string fileName = needOtaFile.fileName;
//构造文件完全限定名,准备将网络流下载为本地文件
string fileFullName = needOtaFile.downloadPath;
string downloadDir = Path.GetDirectoryName(fileFullName);
if (!Directory.Exists(downloadDir))
{
Directory.CreateDirectory(downloadDir);
}
//构造文件的配置文件的完全完全限定名
string fileCfgName = needOtaFile.downloadPath + ".cfg";
//请求地址
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
WebResponse response = request.GetResponse();
long fileLength = response.ContentLength; //获得文件长度
response.Close();
long savePosition = 0;
//本地构造文件流
FileStream fs;
FileStream fscfg;
if (File.Exists(fileFullName))
{
string localmd5 = Common.MD5File(fileFullName);
if (localmd5 == needOtaFile.md5)
{
return;
}
fs = new FileStream(fileFullName, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
//如果存在配置文件，则继续下载
if (File.Exists(fileCfgName))
{
fscfg = new FileStream(fileCfgName, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
byte[] buf = new byte[fscfg.Length];
int len = fscfg.Read(buf, 0, buf.Length);
string otaText = Encoding.UTF8.GetString(buf, 0, len);
string[] cfgs = otaText.Split('|');
if (cfgs.Length == 4 && cfgs[0] == fileName && cfgs[1] == fileLength.ToString() && cfgs[2] == needOtaFile.md5)
{ //ota文件校验正确
savePosition = Convert.ToInt64(cfgs[3]);
}
else
{
string cfg = fileName + "|" + fileLength + "|" + needOtaFile.md5 + "|" + savePosition;
fscfg.Position = 0;
buf = Encoding.UTF8.GetBytes(cfg);
fscfg.Write(buf, 0, buf.Length);
fscfg.Flush(); //创建配置文件
}
}
else
{
fscfg = new FileStream(fileCfgName, FileMode.Create);
string cfg = fileName + "|" + fileLength + "|" + needOtaFile.md5 + "|" + savePosition;
byte[] buf = Encoding.UTF8.GetBytes(cfg);
fscfg.Write(buf, 0, buf.Length);
fscfg.Flush(); //创建配置文件
}
}
else
{
fs = new FileStream(fileFullName, FileMode.Create);
if (File.Exists(fileCfgName))
{
File.Delete(fileCfgName);
}
string cfg = fileName + "|" + fileLength + "|" + needOtaFile.md5 + "|" + savePosition;
fscfg = new FileStream(fileCfgName, FileMode.Create);
byte[] buf = Encoding.UTF8.GetBytes(cfg);
fscfg.Write(buf, 0, buf.Length);
fscfg.Flush(); //创建配置文件
}
down:
//开辟内存空间
byte[] buffer = new byte[1024];
request = (HttpWebRequest)WebRequest.Create(uri);
//请求开始位置
request.AddRange(savePosition, fileLength);
fs.Position = savePosition;
//获取网络流
Stream ns = request.GetResponse().GetResponseStream();
do
{
//获取文件读取到的长度
int length = ns.Read(buffer, 0, buffer.Length);
if (length > 0)
{
//将字节数组写入流
fs.Write(buffer, 0, length);
fs.Flush(); //写入文件
savePosition += length;
string cfg = fileName + "|" + fileLength + "|" + needOtaFile.md5 + "|" + savePosition;
fscfg.Position = 0;
byte[] buf = Encoding.UTF8.GetBytes(cfg);
fscfg.Write(buf, 0, buf.Length);
fscfg.Flush(); //创建配置文件
int percent = (int)(Math.Round((double)savePosition / fileLength, 2) * 100);
backgroundWorker1.ReportProgress(percent);
}
else
{
break; //下载完成
}
} while (true);
fs.Close();
string md5 = Common.MD5File(fileFullName);
if (md5 != needOtaFile.md5)
{
//文件下载错误
fs = new FileStream(fileFullName, FileMode.Create);
savePosition = 0;
string cfg = fileName + "|" + fileLength + "|" + needOtaFile.md5 + "|" + savePosition;
fscfg.Position = 0;
byte[] buf = Encoding.UTF8.GetBytes(cfg);
fscfg.Write(buf, 0, buf.Length);
fscfg.Flush(); //创建配置文件
goto down;
}
else
{
ns.Close();
fscfg.Close();
File.Delete(fileCfgName);
}
}
