/// <summary>
/// 从数据库字段中读取文件并保存到目的文件，
/// 注意，此字段必须是由WriteFileToDataRow写入！
/// </summary>
/// <param name="row"></param>
/// <param name="fieldName"></param>
/// <param name="destFileName"></param>
/// <returns></returns>
public static I3MsgInfo ReadFileFromDataRowBeforeRar(DataRow row, string fieldName, string destFileName)
{
#region 初始化临时文件
string tmpDir = I3DirectoryUtil.GetAppTmpDir();
string tmpRarFileName = Path.Combine(tmpDir, I3DateTimeUtil.ConvertDateTimeToLongString(DateTime.Now) + ".rar");
I3MsgInfo msg = I3DirectoryUtil.CreateDirctory(tmpDir);
if (!msg.State)
{
return(msg);
}
if (!I3FileUtil.CheckFileNotExists(tmpRarFileName))
{
return(new I3MsgInfo(false, ""));
}
#endregion
try
{
#region 从数据库读取文件到临时文件
try
{
byte[] buffer = (byte[])row[fieldName];
if (buffer.Length == 0)
{
return(new I3MsgInfo(false, "数据字段长度为0!"));
}
using (FileStream stream = new FileStream(tmpRarFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
stream.Write(buffer, 0, buffer.Length);
stream.Flush();
stream.Close();
}
}
catch (Exception ex)
{
return(new I3MsgInfo(false, ex.Message, ex));
}
#endregion
#region 解压
using (I3Rar rar = new I3Rar())
{
msg = rar.UnCompressASingleFile(tmpRarFileName, "IEFS_Rar.tmp", destFileName);
if (!msg.State)
{
return(msg);
}
}
#endregion
return(I3MsgInfo.Default);
}
finally
{
#region 除临时Rar文件
I3FileUtil.CheckFileNotExists(tmpRarFileName);
#endregion
}
}
/// <summary>
/// 将文件经过rar压缩后，写入数据库字段中
/// 写入数据库中的实际是一个rar压缩文件，里面只有一个文件，文件名为 IEFS_Rar.tmp
/// </summary>
/// <param name="row"></param>
/// <param name="fieldName"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public static I3MsgInfo WriteFileToDataRowAfterRar(DataRow row, string fieldName, string sourceFileName, bool deleteSource)
{
if (!File.Exists(sourceFileName))
{
return(new I3MsgInfo(false, "文件不存在！文件名：" + sourceFileName));
}
string tmpDir = I3DirectoryUtil.GetAppTmpDir();
string tmpRarFileName = Path.Combine(tmpDir, I3DateTimeUtil.ConvertDateTimeToLongString(DateTime.Now) + ".rar");
string tmpSourceFileName = Path.Combine(tmpDir, I3DateTimeUtil.ConvertDateTimeToLongString(DateTime.Now));
tmpSourceFileName = Path.Combine(tmpSourceFileName, "IEFS_Rar.tmp");
#region 生成临时目录并删除临时文件
if (!I3FileUtil.CheckFileNotExists(tmpRarFileName))
{
return(new I3MsgInfo(false, "临时文件删除失败"));
}
I3MsgInfo msg = I3DirectoryUtil.CreateDirctory(tmpDir);
if (!msg.State)
{
return(msg);
}
if (!I3FileUtil.CheckFileNotExists(tmpSourceFileName))
{
return(new I3MsgInfo(false, "临时源文件删除失败"));
}
msg = I3DirectoryUtil.CreateDirectoryByFileName(tmpSourceFileName);
if (!msg.State)
{
return(msg);
}
msg = I3FileUtil.MoveFile(sourceFileName, tmpSourceFileName, deleteSource);
if (!msg.State)
{
return(msg);
}
#endregion
try
{
#region 压缩
using (I3Rar rar = new I3Rar())
{
msg = rar.CompressASingleFile(tmpSourceFileName, tmpRarFileName);
if (!msg.State)
{
return(msg);
}
}
if (!File.Exists(tmpRarFileName))
{
return(new I3MsgInfo(false, "未知原因，压缩失败！文件名：" + tmpRarFileName));
}
#endregion
#region 写入
using (FileStream stream = File.OpenRead(tmpRarFileName))
{
byte[] buffer = new byte[stream.Length];
stream.Position = 0;
int readSize = stream.Read(buffer, 0, buffer.Length);
if (readSize != buffer.Length)
{
return(new I3MsgInfo(false, "数据缓冲读取失败！目标长度：" + buffer.Length.ToString() + "，读取长度：" + readSize.ToString()));
}
try
{
row.BeginEdit();
row[fieldName] = buffer;
row.EndEdit();
stream.Close();
return(I3MsgInfo.Default);
}
catch (Exception ex)
{
return(new I3MsgInfo(false, ex.Message, ex));
}
}
#endregion
}
finally
{
#region 除临时文件
I3FileUtil.CheckFileNotExists(tmpRarFileName);
I3DirectoryUtil.DeleteDirctory(Path.GetDirectoryName(tmpSourceFileName));
#endregion
}
}
