file attribute question

[SIMIN]

Hello all,

I want to save a file, so I show user save file dialog.

But when user selects an existing file and confirm its overwrite, I cannot simply set its attribute to normal and delete it, then overwrite it!

I have to check if it's not either read only or hidden or system, then delete and overwrite it, am I right?

So I use this code to do the check, but it won't work, it always returns that the file is locked, even if the file is archive only!

What should I do?

If My.Computer.FileSystem.FileExists(SaveFileDialog.FileName) Then
   If System.IO.File.GetAttributes(SaveFileDialog.FileName) <> FileAttributes.Archive And System.IO.File.GetAttributes(SaveFileDialog.FileName) <> FileAttributes.Normal Then
       MessageBox.Show("The output file is locked." + vbNewLine + "Please use a different file name.", My.Application.Info.AssemblyName, MessageBoxButtons.OK, MessageBoxIcon.Warning)
       Exit Sub
   End If
End If

[MrPaul]

Use bitwise comparison

 

FileAttributes is a flags-type enumeration, meaning variables of that type can contain by a bitwise combination of multiple values. You should therefore test for certain attributes using the bitwise And operator (& in C#):

 

Dim attrs As FileAttributes = File.GetAttributes(SaveFileDialog.FileName)
If ((attrs And FileAttributes.Hidden) = FileAttributes.Hidden) OrElse _
  ((attrs And FileAttributes.System) = FileAttributes.System) OrElse _
  ((attrs And FileAttributes.ReadOnly) = FileAttributes.ReadOnly)) Then
   'File is hidden, system, or read only
End If

 

Good luck :cool: