//fileID是一个GUID
public bool AddFile(string sourceFileName, string fileID)
{
string tempPath = Application.StartupPath + @"\tempzip";
CheckTempPath(tempPath);
string destFileName = tempPath + @"\" + Path.GetFileName(sourceFileName) + ".zip";
I3SharpZip.ZipFile(sourceFileName, destFileName, 9, 4096);
FileStream dataFileStream = null;
FileStream destFileStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.ReadWrite, FileShare.None);
destFileStream = new FileStream(destFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
if (dataFileStream.Length + destFileStream.Length > int.MaxValue)
{
//MessageBox.Show("增加此文件后，数据文件大小将超过2G，取消增加此文件!");
IEFS_Error.LastErrorMessage = "增加此文件后，数据文件大小将超过2G，取消增加此文件!";
return(false);
}
PutNextEntry(dataFileStream, fileID, Path.GetFileName(sourceFileName), destFileStream.Length);
byte[] buffer = new byte[4096];
while (true)
{
int size = destFileStream.Read(buffer, 0, buffer.Length);
if (size <= 0)
{
break;
}
dataFileStream.Write(buffer, 0, size);
}
return(true);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return(false);
}
finally
{
if (dataFileStream != null)
{
dataFileStream.Close();
}
if (destFileStream != null)
{
destFileStream.Close();
}
File.Delete(destFileName);
}
}
public bool GetFile(string destFileName, string fileID)
{
#region 获取文件信息
long pos = 0;
IEFS_FileInfo fileInfo = GetFileInfo(fileID, out pos);
if (fileInfo == null)
{
return(false);
}
#endregion
#region 得到临时文件名
string tempPath = Application.StartupPath + @"\tempzip";
CheckTempPath(tempPath);
string tempFileName = tempPath + @"\" + fileID + ".zip";
#endregion
#region 从数据文件中提取相应文件的压缩包
FileStream dataFileStream = null;
FileStream tempFileStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None);
byte[] buffer = new byte[4096];
dataFileStream.Seek(pos + fileInfo.BytesLength, SeekOrigin.Begin);
while (true)
{
int size = dataFileStream.Read(buffer, 0, buffer.Length);
if (size <= 0)
{
break;
}
if (dataFileStream.Position > (pos + fileInfo.BytesLength + fileInfo.fileLength))
{
int xsize = size;
size -= Convert.ToInt32(dataFileStream.Position - pos - fileInfo.BytesLength - fileInfo.fileLength);
if (size == 0)
{
break;
}
buffer = new byte[size];
dataFileStream.Seek(dataFileStream.Position - xsize, SeekOrigin.Begin);
dataFileStream.Read(buffer, 0, buffer.Length);
tempFileStream.Write(buffer, 0, buffer.Length);
break;
}
else
{
tempFileStream.Write(buffer, 0, buffer.Length);
}
}
}
catch (Exception ex)
{
#region 出错处理
MessageBox.Show(ex.Message);
return(false);
#endregion
}
finally
{
#region 释放
if (dataFileStream != null)
{
dataFileStream.Close();
}
if (tempFileStream != null)
{
tempFileStream.Close();
}
#endregion
}
#endregion
#region 从压缩包中解压文件
I3SharpZip.UpZipFileByIndex(tempFileName, destFileName, 4096, 1);
return(true);
#endregion
}
