internal FileSliceInfo_Md5 GetFilesSlice_Md5Info(string fileName, SeatManageSubsystem system)
{
try
{
string filepath = "";
if (fileName.IndexOf(@"\") == 0)//如果\第一次出现的位置为1，则不用加斜杠
{
filepath = string.Format("{0}{1}{2}", uploadFolder, system.ToString(), fileName);
}
else
{
filepath = string.Format(@"{0}{1}\{2}", uploadFolder, system.ToString(), fileName);
}
FileSliceInfo_Md5 file = new FileSliceInfo_Md5();
file.Name = fileName;
file.Length = 0;
file.Offset = 0;
file.Data = null;
if (System.IO.File.Exists(filepath))
{
//文件已经存在
System.IO.FileInfo fi = new System.IO.FileInfo(filepath);
file.Md5 = SeatManage.SeatManageComm.SeatComm.GetMD5HashFromFile(filepath);
file.Length = fi.Length;
file.Offset = fi.Length;//返回追加数据后的文件位置
fi = null;
return(file);
}
else
{
return(null);
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 下载文件
/// </summary>
/// <param name="filePath">文件的完整</param>
/// <param name="relativePath">文件的相对路径</param>
/// <param name="system">系统名称</param>
/// <returns></returns>
public bool FileDownLoad(string filePath, string relativePath, SeatManageSubsystem system)
{
for (int i = 0; i < 50; i++)
{
//获取文件的路径,已经保存的文件名
FileStream fs = null;
BinaryWriter writer = null;//初始化文件写入器
try
{
string fileName = relativePath;// filePath.Substring(filePath.LastIndexOf(@"\") + 1);
string dirPath = filePath.Substring(0, filePath.LastIndexOf(@"\") + 1);
FileSliceInfo file2 = FileTransportBll.GetFilesSlice_Md5Info(fileName, system);
FileSliceInfo_Md5 f = file2 as FileSliceInfo_Md5;
if (file2 == null)
{
if (DownloadError != null)
{
DownloadError(string.Format("文件{0}下载失败。", fileName));
}
return(false);
}
else if (File.Exists(filePath))
{
//先设置文件只读属性，然后再删除，不然无法删除文件
File.SetAttributes(filePath, System.IO.FileAttributes.Normal);
if (f.Md5 == SeatManageComm.SeatComm.GetMD5HashFromFile(filePath))
{
return(true);
}
}
file2.Name = fileName;
file2.Offset = 0;
//如果文件目录不存在,创建文件所存放的目录.
if (!Directory.Exists(dirPath))
{
Directory.CreateDirectory(dirPath);
}
//文件先下载，下载完成后再删除
fs = new FileStream(filePath + ".tz", FileMode.OpenOrCreate);
file2.Offset = fs.Length;
if (file2.Offset != file2.Length)
{
//文件偏移位置,表示从这个位置开始进行后面的数据添加
writer = new BinaryWriter(fs);//初始化文件写入器
file2 = FileTransportBll.FileDownLoad(file2, system);
i = 0;
while (file2.Data != null)
{
//打开文件
long Offset = file2.Offset; //file.Offset
if (Offset >= int.MaxValue)
{
writer.Seek(int.MaxValue, SeekOrigin.Begin);
Offset = Offset - int.MaxValue;
while (Offset > 0)
{
if (Offset >= int.MaxValue)
{
writer.Seek(int.MaxValue, SeekOrigin.Current);
Offset = Offset - int.MaxValue;
}
else
{
writer.Seek(int.Parse(Offset.ToString()), SeekOrigin.Current);
Offset = 0;
}
}
}
else
{
writer.Seek(Int32.Parse(Offset.ToString()), SeekOrigin.Begin);//设置文件的写入位置
}
writer.Write(file2.Data); //写入数据
file2.Offset = fs.Length; //返回追加数据后的文件位置
file2.Data = null;
file2 = FileTransportBll.FileDownLoad(file2, system);
i = 0;
if (HandleProgress != null)
{
int progress = (int)(((double)file2.Offset / (double)((long)file2.Length)) * 100);
HandleProgress(progress);
}
}
writer.Close();
fs.Close();
}
else//否则文件已经下载完成，只是还没有更改后缀，则关闭文件流
{
fs.Close();
}
if (File.Exists(filePath + ".tz"))
{
if (File.Exists(filePath))
{
File.Delete(filePath);
}
File.Move(filePath + ".tz", filePath);
}
return(true);
}
catch (Exception ex)
{
if (writer != null)
{
writer.Close();
}
if (fs != null)
{
fs.Close();
}
}
}
return(false);
}
