Question

Keep file data consistent

Asked by: ruffone

I am adding image file data to database. On another pass I am checking the file name and file length of the file on disk against the equivalent data that I have stored in the database. The file name match up but the length does not. There is consistently a one byte difference between the number stored in the database and the length returned from the file on disk. Could anyone advise me as to where this extra byte comes from and how I might keep them consistent.

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Asked On
2009-05-01 at 12:05:57ID24373519
Tags

VB

Topic

Visual Basic Programming

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Answers

 

by: Death_RatPosted on 2009-05-01 at 12:37:49ID: 24282742

I am throwing this out there for those who want to argue about it. Even though is the same file, it is located in a different place, even if it is on the same drive. This new location would make a change in the file structure, thus increasing or decreasing the file size. If the issue is with less than 10 bytes, I wouldn't sweat it unless you have written code that would require it to be exact.

 

by: ruffonePosted on 2009-05-01 at 12:48:43ID: 24282826

That is my issue. I am checking the folder for files that are not yet in the database. The file names are unique but I wanted to go that extra step and compare there lengths. Any work around to suggest

 

by: egl1044Posted on 2009-05-01 at 13:32:17ID: 24283170

How are you copying the bytes from the file on disk into the databse?

 

by: ruffonePosted on 2009-05-01 at 14:27:16ID: 24283541

This is the function I am using to recover the data from the file

    Public Shared Function ReadFile(ByVal filename As String) As Byte()
        Using fs As New FileStream(filename, FileMode.Open, FileAccess.Read)
            Dim fileContents As Byte() = New Byte(fs.Length) {}
            fs.Read(fileContents, 0, Convert.ToInt32(fs.Length))
            fs.Close()
            Return fileContents
        End Using
    End Function

                                              
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by: ruffonePosted on 2009-05-02 at 19:46:19ID: 24288490

This fixed the problem
Dim fileContents() As Byte = New Byte((fs.Length) - 1) {}

20120131-EE-VQP-002

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