void DownloadFile(TreeNode node, TreeNode Lnode)
{
string newFileName = System.IO.Path.Combine(Lnode.Name, node.Text);
if (File.Exists(newFileName))
{//先默认覆盖重传
int opcode = allowRep;
if (opcode == 0)
{
FileReplace fileReplace = new FileReplace(node.Text);
fileReplace.ShowDialog();
if (fileReplace.Flag)
{
allowRep = fileReplace.Status;
}
opcode = fileReplace.Status;
}
if (opcode == -1)
{
return;
}
File.Delete(newFileName);
}
string tempFileName = Path.Combine(Lnode.Name, System.IO.Path.GetFileNameWithoutExtension(newFileName) + ".tmp");
FileStream tmpStream = null;
if (File.Exists(tempFileName))
{
try
{
tmpStream = new FileStream(tempFileName, FileMode.Open);
byte[] bufs = new byte[14];
tmpStream.Read(bufs, 0, 14);
string oldDate = myFTP.ecd.GetString(bufs, 0, 14);
tmpStream.Close();
string newDate = myFTP.GetDate(node.Name);
if (oldDate != newDate)
{
throw new Exception();
}
}
catch
{
AddLog("缓存不可用，尝试重新下载：");
tmpStream.Close();
File.Delete(tempFileName);
}
}
//准备缓存文件，并开始下载
try
{
//重新生成缓存文件
if (!File.Exists(tempFileName))
{
tmpStream = new FileStream(tempFileName, FileMode.Create);
string newDate = myFTP.GetDate(node.Name);
byte[] tmps = myFTP.ecd.GetBytes(newDate);
//AddLog(tmps.Length.ToString());
tmpStream.Write(myFTP.ecd.GetBytes(newDate), 0, tmps.Length);
tmpStream.Close();
}
myFTP.DownLoadFile(tempFileName, node.Name);
}
catch (Exception ex)
{
tmpStream.Close();
AddLog(ex.Message);
}
//保存，并删除缓存
FileStream file = new FileStream(tempFileName, FileMode.Open);
byte[] tmp2 = new byte[8192];
file.Seek(14, SeekOrigin.Begin);
FileStream saveFile = new FileStream(newFileName, FileMode.Create);
while (true)
{
int BytesDone = file.Read(tmp2, 0, tmp2.Length);
if (BytesDone <= 0)
{
file.Close();
saveFile.Close();
break;
}
saveFile.Write(tmp2, 0, BytesDone);
}
File.Delete(tempFileName);
}
