Encoding Code128C Barcode Data?
May 25, 2012
I have a case where I need to create barcodes to a Crystal Reports 2008 report (but this isn't as much about Crystal Reports in the end). But after a day's worth of googling I've become quite puzzled with all the different methods of encoding barcode data and all the various fonts.
I downloaded a free Code128 font from [URL] and also a program that can encode text into suitable format for the barcode font to use from here [URL] Now that works splendidly with the font installed, but the problem is that Crystal Reports does not recognize it as a barcode font when printing. It shows up fine in designer and when printing it out to PDF, but in my application's CrystalViewer it is shown as Arial font and the same goes for printing. Yet it can be succesfully exported as a PDF file via Crystal, and the barcode shows up fine. This is all on the same computer so the font is installed properly obviously.
So anyways, I noticed that Windows 7 comes with its own Code128, Code128A, B and C fonts. THEY show up properly (but are not readable because I don't know the proper control characters) in every place I need them to, but I can't for the life of me understand how to encode suitable data for them. The previously used encoding method produces box-characters because the control characters in it are not a part of these fonts. For example if I encode "123456" with the program I mentioned, it'll give out "Í,BXLÎ" and that works fine with the external Code128 font. But it does not work with the ones Windows 7 comes with, they show up as "[](proper bars)[]", or "Í(proper bars)Î". The start and stop characters are replaced with boxes or left as they are because they don't exist as proper bars for the font. what the deal is with the Windows 7's built-in Code128 fonts? Why do they use different control characters for other fonts of the same format? Can anyone figure out how to get a readable and proper barcode for example in Excel with the built-in Code128 fonts?
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Aug 2, 2010
I am using Richard L. Grier's Enhanced Serial Port dll to read input from a serial port barcode scanner I notice that the datareceived event fires only once per barcode scan, but the delegate sub fires twice per barcode scan. Once for 1st half of Barcode , 2nd for 2nd part of barcode This makes it hard to capture the full barcode so it can be passed to routines in my vb.net 2008 windows application In Richard's example 'Test Enhanced Port' program he sends it to a textbox using .selectedtext and it works fine Richards Delegate code ......................
Public Delegate Sub DisplayData(ByVal Buffer As String)
'This delegate routine marshals receive data from the receive thread context DataReceived to the Windows Form STAThread context
Private Shared Sub Display(ByVal Buffer As String)
[code]....
I am trying to set a variable to the full barcode to pass to routines, instead of writing to a textbox but am not having any success
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Nov 27, 2009
I am a student and I am about to make a program that will use a barcode scanner well ofcourse to scan a barcode. My problem is i don't know what library to use and what certain things i need to do so that when i am going to scan a barcode it'll be something like show it on a textbox and pull something from the database. i've actually research some. i've seen mscomm1 (not so sure about that) and POS for .net (haven't fully understood its use) were those will help me develop my program?i have a metrologic ms9520 Voyager barcode scanner. and i am going to create a program for it in vb2005.
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Mar 16, 2011
I am writing a string of about 120 characters to a 2D barcode. Along with other text, the string contains a unique ticket number. I want to ensure that someone doesn't generate counterfeit tickets by reading the 2D barcode and generation their own barcoded tickets.
I would like to hash the string and append the hash value to what gets embedded in the barcode. That way I can compare the two on reading and see if the data had been tampered with. I have seen several hash function that return 64 bytes and up but the more characters you embed in a 2D barcode the bigger the barcode image becomes. I would like an algorithm that returns a fairly small value. It would also be nice if I could provide the function my own key. Collision is not that big of a deal. This isn't any kind of national security application.
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Mar 11, 2010
I'm building an application that reads barcode scanning data into multiple forms and textboxes. At the moment, to handle that data I have created a large nested if statement that checks to see which object has focus so that the scanned data is placed there and focus moves down to the next object:
Private Sub HandleData(ByVal TheReaderData As Symbol.Barcode.ReaderData)
'Scanning Data into frmGetCount
If frmName.Name = "frmGetCount" Then
[code].....
This is just for one of 5 forms I am currently developing. I am looking for a way to make this code much more dynamic and re-usable by removing the hard-coded objects name
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Nov 8, 2011
I've easily found various QR-Code generators, but I need to use the data stored in the barcode on a regular desktop app using VB.Net and a WebCam or eventually an flash, javascript webpage to do the job.
Should there be an online service for this? Maybe a flash app?
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Jul 3, 2009
How to change encoding for posting data from Excel 2007 to win-1251? Now I have UTF-8, use WinHTTP.dll
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Aug 28, 2009
I am developing a Winforms application which read barcode from barcode scanner. It's an Human wedge scanner. This will work if I placed the cursor in any textbox or notepad. But i don't want like that. Reason is that it's cordless scanner. If some want to scan some thing in store they will move around, so there is possibility of screen saver coming or system gets locked if that happens the barcodes wont capture, but the user who is scanning the barcodes won't know this thing.
So i am reading the data using serial port communication and my scanner sending the data character by character, Not a whole string. so for that I wrote the following code. Thsi code will works if i am writing to any textbox. But it is not working if want to store it in any global string. Only first character is storing in the string. The below code is working perfectly fine. but if want to save the string in Global String variable instaed of textbox the only first character in the string is storing.
[Code]...
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Oct 28, 2009
I am sending a DDE message to a client using System.Text.Encoding.ASCII.GetBytes(item) . However, before the message is actually sent, I would like to get the message coded where if the item="Ask" then item=Ask (string variable) and so on. The code is:
Protected Overrides Function OnRequest(ByVal conversation As DdeConversation, ByVal item As String, ByVal format As Integer) As RequestResult
' Return data to the client only if the format is CF_TEXT
[code]....
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Apr 26, 2011
Im using VB2008... Net framework 3.0. Basically I have a barcode scanner that is sending the software data...Everything is working fine if I interface the scanner as a keyboard wedge and set the scanner suffix as 'Enter'...In the software I have an event handler on keypress.down...
If keycode.Enter then
.....
.....
....
etc.
However as a RS232 interface I cant get the same result? Hyper terminal reads it perfectly. I've tried all the keypress options but it doesnt work (I assume because it's not actually a key press). when the textbox recieves the CR/LF from RS232? The scanner that does keyboard wedge interfacing is not an option as it is far too expensive for my project.
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Nov 27, 2010
I'm mohammed from Oman ,I'm visual studio.net programmer How I can Read the Data From Barcode Weight scales By Serial port and TcpIp port
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Mar 11, 2010
url...we get the encoded as alphapet base64..i want to talk as low level programming what will happen or this data how it will represent as binary and send it is it encoded again as ascii to binary or there is another idea.
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May 3, 2011
I have done very little with encoding of Text. Truthfully, I don't really even know what it means exactly.
For example, if I have something like:
CODE:
Is that 'encoded' in memory in a particular format? Does that format depend on what language I'm using?
If I were in another country, like China, for example, and I had a string of Chinese (mandarin? My apologies if I'm using the wrong words here) would the following code (that I've used fine on English strings) still work the same?
CODE:
Or would it lose all meaning when you convert that .Net string to a UTF8Encoding when that conversion isn't valid?
Finally, I've worked with .Net for a few years now and I've never seen, heard, or had to do anything with Encoding. Am I the exception, or is it not a common thing to do?
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Jun 4, 2010
this is a continuation from the root cause of the problem exposed in this other thread. I'm starting a new thread with a different topic name because I think it is not related to the other thread's topic (which was encryptioto enumerate them.Anyway, we found out that some characters become changed from what their original byte value was, when you put them into a textbox.The specific characters are as follows:Unicode char
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Jul 21, 2010
I am writing an inventory control application in which a barcode scanner will be hooked up to a laptop computer in our shipping/receiving department. What I'm wondering is, whenever a shipment comes in and the receiving clerk starts scanning the products, what exactly do I need to do in order to setup our database so that the scanner recognizes which vendor/product etc. and puts the data in the correct tables. I've written inventory control apps before but never one that incorporated the use of a barcode scanner.
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Nov 23, 2010
So i bought a cheap USB barcode scanner to play around with. So far pretty simple to use, on theing thats baffling me though is after the keyUp event and the string parsing, how do i reset the value of the textbox that reads the string to make it wait for a new keyup event. Eventually i'm going to try adding rows to tables and autocompleting cell values based on the parsed string. So what would be the best way to start looking at this?
[Code]...
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Feb 18, 2010
I'm using this code to convert string to ISO8859-1
[code..]
But the problem is when an user writes this caracter:
EXAMPLE:
[code...]
I think that my code is wrong. Because if I send the same string encoded "price+80%2BVAT", Why in VB.NET code not runs and in PHP runs fine? Is the same encoded string.
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Mar 26, 2011
i got a problem when receiving data from networkstream that was converted from bytes to string.. the output would be the same but when i compare the the string generated from Encoding.ASCII.GetString() compared to the actual string, the output is not the same..
This is my code..
Server:
CODE:
Client:
CODE:
just for ping purposes.. :)
my server pings to client..is there any instance that when the string will be converted to bytes, the string will change?
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Apr 9, 2012
Is there any Visual Basic SDK that will let me scan a barcode from a webcam, not an image? I have seen some that read from files, but this is not what I am looking for. If possible, I would love it if this is free!
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Apr 27, 2012
I have a simple question about string. Consider following code:
Dim S1 as String = "abc"
What is the encoding for S1? Is that UTF-8 or depending on user windows local setting?
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Dec 12, 2010
I have downloaded the BarcodeLib.dll from[url]...
And however, my barcode scanner cannot read the hard copy barcode images that i have printed out as the following.[url]...
I have done research and some articles mention that dimension of the images will effect the readability of the barcode.
May i know what is the correct dimension to make my barcode images to be readable?
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Dec 12, 2009
I am working on a Point of Sale system using VB express 2008.I want to generate invoice with Barcode and also stock items with Barcodesort of Barcode system i should use for this and also how i can code to generate and pring the Barcod
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Apr 14, 2011
i have a inventory software in visual basic and sql server. there i have product info, product receive and product sales option. there i need to add a new feature in product. every pcs of product will have barcode which will be generated by my software at the time of receiving the product. and at the time of selling the product, the user will only scan the barcode by the device.
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Apr 20, 2012
I am writing a little project to parse a CSS file, and base64 encode all the background images.While I am able to parse the CSS correctly, it seems that everytime I try to convert the image file into a base64Encoded string, the string returned is always exactly the same.Please assume that all image paths are passing correctly to the method. In this instance, all images are fully qualified urls, so the first section of the method is what is doing the conversion.[code]
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Jun 5, 2011
how can i convert an integer into a barcode?
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Feb 18, 2006
i am using inventory system which is base on stock. i want to create barcode for each item through vb.net.
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Jul 2, 2010
Ive been trying to find a example for using itextsharp to create a barcode in vb.net. i have found a few C# examples. And apperently im not smart enough to convery the code myselfHere is an example. Perhave someone could tell me what to do to convert itI however would like to save the file as a jpg.
Quote:
# dfContentByte cb = writer.DirectContent;
Barcode39 code39 = new Barcode39();
[code].....
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Sep 10, 2009
i have a task to create ,read,update xml file this file have encoding UTF-16. when i create using vb.net ,i am using xmltextwriter. i cannot find encoding UTF-16. it is only have UTF8,UTF7,UTF32. that's don't have UTF16.that's anyone have clue or link to guide me create,read,update file xml with encoding UTF-16??
Imports System.Xml
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim writer As New XmlTextWriter("product.xml", System.Text.Encoding.UTF8)
writer.WriteStartDocument(True)
[Code]...
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Sep 6, 2011
I would like to know the way a stream or a string is encoded before converting it. If a string is not utf-8 it would be converted to utf-8.
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Sep 19, 2009
How to develop a barcode generator and able to print it out? Google so long but unable to find any sample to do it.
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