/// <summary>
/// Gets the information about a file.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="fileHandle">The file handle.</param>
/// <returns>The file characteristics, if the file information was retrieved successfully, otherwise null.</returns>
public override FileCharacteristics GetFileCharacteristics(string fileName, IntPtr fileHandle)
{
Win32FileNativeMethods.BY_HANDLE_FILE_INFORMATION fileInfo;
if (Win32FileNativeMethods.GetFileInformationByHandle(fileHandle, out fileInfo))
{
return(new FileCharacteristics(DateTime.FromFileTimeUtc(fileInfo.ftCreationTime), fileInfo.nFileSizeLow + (((long)fileInfo.nFileSizeHigh) << 32)));
}
return(null);
}
/// <summary>
/// Gets the information about a file.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="fileStream">The file stream.</param>
/// <returns>The file characteristics, if the file information was retrieved successfully, otherwise null.</returns>
public override FileCharacteristics GetFileCharacteristics(string fileName, FileStream fileStream)
{
if (fileStream != null)
{
Win32FileNativeMethods.BY_HANDLE_FILE_INFORMATION fileInfo;
if (Win32FileNativeMethods.GetFileInformationByHandle(fileStream.SafeFileHandle.DangerousGetHandle(), out fileInfo))
{
return(new FileCharacteristics(DateTime.FromFileTimeUtc(fileInfo.ftCreationTime), DateTime.FromFileTimeUtc(fileInfo.ftLastWriteTime), fileInfo.nFileSizeLow + (((long)fileInfo.nFileSizeHigh) << 32)));
}
}
return(null);
}
/// <summary>
/// Gets the information about a file.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="fileHandle">The file handle.</param>
/// <param name="lastWriteTime">The last write time of the file in UTC.</param>
/// <param name="fileLength">Length of the file.</param>
/// <returns>
/// A value of <c>true</c> if file information was retrieved successfully, <c>false</c> otherwise.
/// </returns>
public override bool GetFileInfo(string fileName, IntPtr fileHandle, out DateTime lastWriteTime, out long fileLength)
{
Win32FileNativeMethods.BY_HANDLE_FILE_INFORMATION fi;
if (Win32FileNativeMethods.GetFileInformationByHandle(fileHandle, out fi))
{
lastWriteTime = DateTime.FromFileTimeUtc(fi.ftLastWriteTime);
fileLength = fi.nFileSizeLow + (((long)fi.nFileSizeHigh) << 32);
return(true);
}
else
{
lastWriteTime = DateTime.MinValue;
fileLength = -1;
return(false);
}
}