How to read .lbl file

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I want to read my .lbl file and store its data into a database column, So whenever the user wants to modify it, they may create a new *.lbl file from the database.

I have converted my .lbl file data into Binary by using the snippet shown below:

C#

byte[] fileBytes = File.ReadAllBytes("D:\\Work\\PNS\\TEST.lbl");
StringBuilder sb = new StringBuilder();

foreach (byte b in fileBytes)
{
    sb.Append(Convert.ToString(b, 2).PadLeft(8, '0'));
    string bindata = sb.ToString();  // store this variable value in DataBase Column
}

File.WriteAllText("D:\\Work\\PNS\\TESTnew.lbl", sb.ToString());

But, When I Open a new file I get Error like this

<br />
<br />
Unable to open label, the file or folder is not accessible, does not exist, or is already opened by another user. Try Opening the label with 'read-only' flag set.

Kindly help me to figure out this problem

Posted 3-Sep-13 21:03pm

Varun_nayak

Updated 3-Sep-13 21:09pm

Thanks7872

v2

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Comments

Menon Santosh 4-Sep-13 3:10am

what is .lbl file ?

Varun_nayak 4-Sep-13 3:27am

It is Printing Designing file, in that file we store Our Barcode Sticker image and value which are then print and stick on BOX. Some time my client want to modify tat file and want to change in value like expirary date, prise, batch no etc

Richard MacCutchan 4-Sep-13 3:20am

The error message is telling you exactly what is wrong. Check which file you are trying to open. Note also that your Testnew.lbl file will not be in the same format as your original.

V.Lorz 4-Sep-13 3:37am

Just a comment, it's strange to see you need to convert from binary to 'binary string'.

The code snipped seems to be correct at first sight, I've used File.ReadAllBytes() and File.ReadAllText() many times and it works.

Where exactly is the exception rising? The term 'label' in the exception message is a little strange for me. Are you opening the same file in more places?

Varun_nayak 4-Sep-13 4:25am

No, After Creating My TESTnew.lbl, I close all application, and after m trying to open this new file, still showing error

V.Lorz 4-Sep-13 4:36am

I tried this code in my PC and it works perfectly:

for (int Times = 0; Times < 1000; Times++)
{
byte[] Bytes = File.ReadAllBytes( @"C:\Archivos_Locales\smime.p7s" );
StringBuilder BinText = new StringBuilder();

foreach (byte Byte in Bytes)
{
BinText.Append( Convert.ToString( Byte, 2 ).PadLeft( 9, '0' ) );
}

File.WriteAllText( @"C:\Archivos_Locales\smime.p7s.txt", BinText.ToString() );
}

I my oppinion your problem should be in some other place (Anti virus? Other application automatically opening the file), but not in the code.

Varun_nayak 4-Sep-13 5:16am

Check out my below solution.. its run perfectly..
Thanks for your help

Richard MacCutchan 4-Sep-13 4:46am

What program produces that message, and exactly where does it occur?

2 solutions

Solution 1

Instead of ReadAllBytes and WriteAllText of the File class, use methods of e.g. StreamReader and StreamWriter in combination with a FileStream. And use using blocks - that's the most important point here.
Something like:

C#

using (FileStream fs = new FileStream("D:\\Work\\PNS\\TEST.lbl"))
{
    using(StreamReader reader = new StreamReader(fs))
    {
        //now read the contents
    }
}

Posted 3-Sep-13 21:51pm

Bernhard Hiller

Comments

V.Lorz 4-Sep-13 4:41am

This is a good solution when processing large files as it doesn't load the entire file content into memory. But maybe for small files (up to some kilobytes) File.ReadAll---() functions are more convenient as you will require less code and the resulting code will also be more readable.

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Varun_nayak · Accepted Answer · 2013-09-03T23:10:00

I Got the Solution by My self
Here Is the Code:

C#

using (BinaryReader b = new BinaryReader(File.Open(@"D:\Work\PNS\TEST.lbl", FileMode.Open)))
           {
               using (BinaryWriter w = new BinaryWriter(File.Open(@"D:\Work\PNS\TESTnew.lbl", FileMode.Create)))
               {// 2.
                   // Position and length variables.
                   int pos = 0;
                   // 2A.
                   // Use BaseStream.
                   int  length = (int)b.BaseStream.Length;
                   while (pos < length)
                   {
                       // 3.
                       // Read integer.
                      int v = b.ReadInt32();
                       w.Write(v);
                       Console.WriteLine(v);

                       // 4.
                       // Advance our position variable.
                       pos += sizeof(int);
                   }
               }
           }