Copy Files

  • Thread starter Thread starter Masta
  • Start date Start date
M

Masta

Hello Group.

I have a directory with 3000 ".jpg" named like this:

1234_01.jpg
1234_09.jpg
1234_11.jpg
1234_12.jpg
2341_01.jpg
2341_05.jpg
2341_06.jpg
2341_08.jpg
2341_09.jpg
(...)

Four figures (product reference) followed by "_"
I need to copy one file of each reference to another directory.

Thanks in advance.
 
Hello Group.

I have a directory with 3000 ".jpg" named like this:

1234_01.jpg
1234_09.jpg
1234_11.jpg
1234_12.jpg
2341_01.jpg
2341_05.jpg
2341_06.jpg
2341_08.jpg
2341_09.jpg
(...)

Four figures (product reference) followed by "_"
I need to copy one file of each reference to another directory.
Click to expand...

I don't think you can do that with just one scan of the files in the
directory, that is by using a search string to return just one file
that has a unique value in the first four characters of the file name.

I would tackle it like this. I would generate a list of all possible
files with a Directory.GetFiles method call. Then I would loop through
the list an pick off the first four chacacters with a String.Substring
method call. I would add the four letter value to a generic List(Of
String), but only if it hasn't been added yet. Just use the
List.Contains method to check that. Next I would loop through the list
and do a Directory.GetFiles method call specifying a search string of
<first four letters>*.jpg. Pick one them to copy, either random, the
first one, the last one, whatever floats your boat, and copy it with
the File.Copy method.
 
I don't think you can do that with just one scan of the files in the
directory, that is by using a search string to return just one file
that has a unique value in the first four characters of the file name.

I would tackle it like this. I would generate a list of all possible
files with a Directory.GetFiles method call. Then I would loop through
the list an pick off the first four chacacters with a String.Substring
method call. I would add the four letter value to a generic List(Of
String), but only if it hasn't been added yet. Just use the
List.Contains method to check that. Next I would loop through the list
and do a Directory.GetFiles method call specifying a search string of
<first four letters>*.jpg. Pick one them to copy, either random, the
first one, the last one, whatever floats your boat, and copy it with
the File.Copy method.
Click to expand...

What about this using VB2008? This selects a random filename for each
product reference and copies it to a destination folder. It also
saves calling GetFiles more than once.

Private Sub Button_Click(...) Handles Button1.Click
Dim rnd As New Random

Dim files = From f In Directory.GetFiles("c:\test\filefind") _
Group f By key = Path.GetFileName(f).Substring(0,
4) Into Group _
Select Group(rnd.Next(0, Group.Count))

For Each f As String In files
File.Copy(f, Path.Combine("c:\destination",
Path.GetFileName(f)))
Next
End Sub

If you just want the first file in each product reference group,
change the Select line to

Select Group(0)

Or if you want the last file in each product reference group, change
the Select line to

Select Group(Group.Count - 1)

Chris
 
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