private SafeFindFileHandle FindFirstFile(string pathLp, out NativeMethods.Win32FindData win32FindData)
{
SafeFindFileHandle handle = Transaction == null || !NativeMethods.IsAtLeastWindowsVista
// FindFirstFileEx() / FindFirstFileTransacted()
// In the ANSI version of this function, the name is limited to MAX_PATH characters.
// To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path.
// 2013-01-13: MSDN confirms LongPath usage.
// A trailing backslash is not allowed.
? NativeMethods.FindFirstFileEx(Path.RemoveTrailingDirectorySeparator(pathLp, false), FindExInfoLevel, out win32FindData, _limitSearchToDirs, IntPtr.Zero, LargeCache)
: NativeMethods.FindFirstFileTransacted(Path.RemoveTrailingDirectorySeparator(pathLp, false), FindExInfoLevel, out win32FindData, _limitSearchToDirs, IntPtr.Zero, LargeCache, Transaction.SafeHandle);
if (handle.IsInvalid)
{
int lastError = Marshal.GetLastWin32Error();
handle.Close();
if (!ContinueOnException)
{
// Use path without any search filter.
string path = Path.GetDirectoryName(pathLp, false);
switch ((uint)lastError)
{
case Win32Errors.ERROR_FILE_NOT_FOUND:
case Win32Errors.ERROR_PATH_NOT_FOUND:
// MSDN: .NET 3.5+: DirectoryNotFoundException: Path is invalid, such as referring to an unmapped drive.
if (lastError == Win32Errors.ERROR_FILE_NOT_FOUND)
{
lastError = (int)Win32Errors.ERROR_PATH_NOT_FOUND;
}
NativeError.ThrowException(lastError, path);
break;
case Win32Errors.ERROR_DIRECTORY:
// MSDN: .NET 3.5+: IOException: path is a file name.
NativeError.ThrowException(lastError, path);
break;
case Win32Errors.ERROR_ACCESS_DENIED:
// MSDN: .NET 3.5+: UnauthorizedAccessException: The caller does not have the required permission.
NativeError.ThrowException(lastError, path);
break;
}
// MSDN: .NET 3.5+: IOException
NativeError.ThrowException(lastError, path);
}
}
return(handle);
}
private T NewFileSystemEntryType <T>(NativeMethods.Win32FindData win32FindData, string fullPathLp, bool isFolder)
{
// Determine yield.
if (FileSystemObjectType != null && ((!(bool)FileSystemObjectType || !isFolder) && (!(bool)!FileSystemObjectType || isFolder)))
{
return((T)(object)null);
}
if (AsString)
{
// Return object instance FullPath property as string, optionally in Unicode format.
return((T)(object)(AsLongPath ? fullPathLp : Path.GetRegularPathInternal(fullPathLp, GetFullPathOptions.None)));
}
// Make sure the requested file system object type is returned.
// null = Return files and directories.
// true = Return only directories.
// false = Return only files.
var fsei = new FileSystemEntryInfo(win32FindData)
{
FullPath = Path.GetRegularPathInternal(fullPathLp, GetFullPathOptions.None)
};
return(AsFileSystemInfo
// Return object instance of type FileSystemInfo.
? (T)(object)(fsei.IsDirectory
? (FileSystemInfo)
new DirectoryInfo(Transaction, fsei.LongFullPath, PathFormat.LongFullPath)
{
EntryInfo = fsei
}
: new FileInfo(Transaction, fsei.LongFullPath, PathFormat.LongFullPath)
{
EntryInfo = fsei
})
// Return object instance of type FileSystemEntryInfo.
: (T)(object)fsei);
}
/// <summary>Initializes a new instance of the <see cref="T:FileSystemEntryInfo"/> class.</summary>
/// <param name="findData">The <see cref="NativeMethods.Win32FindData"/> structure.</param>
internal FileSystemEntryInfo(NativeMethods.Win32FindData findData)
{
_win32FindData = findData;
}
