I am currently writing a program where I wish to use a barcode scanner to scan a bar code into a system, then use this information to make certain decisions.
How can I get C# to react when I use the bar code scanner? Do I need certain DLLs or APIs to use a bar code reader? I can create bar codes but need a way for C# to read them externally and import them into the program.
Richard,
It is important to know that typically barcode scanners support multiple interfaces that fall into two categories. Many have an option that makes the barcode scanner appear as a keyboard and whenever you scan data the text is entered into your application at the insertion point. The manufacturer of the scanner may refer to this as Keyboard, Keyboard Wedge, HID Keyboard or simply HID mode, however the last one in this list is technically not accurate as there are other HID interfaces besides keyboard.
The second category is often referred to as application mode. There are several different interfaces that support application mode, such as IBM Scanner, HID POS Scanner, etc. Each of these interfaces represent follow a specific hardware specification. You must make sure that the mode that your scanner is in matches the SDK that you are using to interact with the scanner.
If you are using .NET Framework, you may find POS for .NET useful as it abstracts the barcodes scanner away from the software in a way that allows you to use scanners from multiple manufacturers without changes in your application. In this case, you will need to acquire an OPOS Service Object from the scanner manufacturer to use with POS for .NET. See POS for .NET 1.14.1 Download page for more information: https://www.microsoft.com/en-us/download/details.aspx?id=55758
Terry Warwick
Microsoft
As far as it is connected to your device correctly , it will automatically pass data to your Focused itembox in your program.so if you run your program.exe which has a textbox, when you scan a barcode , it will be parsed into that textbox (it has to be focused).
Use the class SerialPort. It can listen your ports and then when you will use your scan the program will read it.
while (spPort.BytesToRead > 0)
{
carac = (char)spPort.ReadByte();
if (carac != 08)
m_mystring += carac;
}
Here is an example of how you can read it. And this is the link to the class : https://msdn.microsoft.com/en-us/library/system.io.ports.serialport(v=vs.110).aspx
It also depends on what form your application takes. If you have the option of uploading a picture or accessing the camera, you can pull an image into your code and then use one of many SDK's to read the barcode out of the image.
I have just implemented this using a web application, and I used the ZXing SDK, which is a free port to .Net and is available via NuGet.
https://github.com/micjahn/ZXing.Net
If you're just starting out, samples within SDKs are the best place to get started.
UWP apps to handle barcode are best explained in the universal samples at --> https://github.com/microsoft/Windows-universal-samples/tree/master/Samples/BarcodeScanner
A Win32 C# .net sample can be found in the Pos For .Net 1.14 SDK mentioned earlier.
Most barcode scanners are "HID" devices, which means that they write the data of the barcode (the small numbers) like you would do manually with your keyboard, they're also recognized as a keyboard by most operating systems.
So the easiest way is just having a textbox. Make sure the focus is automatically on the textbox before the scan, and if you want it to automatically do something, make sure to have an event listening for an enter keydown. (Most HID scanners press an enter right after the scan is complete.)
Barcode scanner has are sending keys when they detects Barcode same goes with QR Scanners.
All you need is just put the focus in a textbox and use some events like text change or keypress/keydown since most of the scanners has an option for you to add/remove newline at the end of each set of keys it returns.
Using a physical barcode scanner is one option, but you're limited to scanning one barcode at a time.
An alternative option would be passing multiple documents, either as images or PDFs, to your application to process in bulk.
IronBarcode is a c# barcode scanner that also allows you to read barcodes quickly and accurately in this way.
// The BarcodeResult.ReadBarcodesMultiThreaded method allows for faster barcode scanning of multiple images or PDFs.
// All threads are automatically managed by IronBarCode.
var ListOfDocuments = new[] { "Image1.PNG", "image2.JPG", "image3.PDF" };
PagedBarcodeResult[] BatchResults =
BarcodeReader.ReadBarcodesMultiThreaded(ListOfDocuments);
Disclaimer: I work for Iron Software.
Related
I'm having a problem with scanning a barcode with a Symbol scanner. What the scanner does, is it reads the barcode and then returns it as basic keyboard strokes.
I now made a very simple Windows Forms apps which just needs to validate barcodes. However, I'm having trouble finding out when the scanner is actually done scanning. It wasn't a problem before because ALL barcodes would always have 12 symbols, so I could just use the following check on the OnTextChangedEvent of a textbox:
if (txtBarcode.Text.Length == 12)
However, as of recently a barcode can ALSO contain 13 symbols, which makes my check useless, since it will skip the last character if the barcode has 13 symbols.
I can't seem to figure out how to find out if the scanner is actually done scanning (done triggering keyboard strokes). I need to find out when the scanner is done scanning (it doesn't matter if the barcode has 12 or 13 symbols) and if it is, I need to execute some action.
Can you help me with this?
The Symbol brand is now own by Zebra Technologies.
You can find information about how to configure the scanner on their support website and, using the 123Scan v2 utility you can configure the scanner so that it can include the barcode data between a pre-amble and a post-amble. So you can know exactly when you hare receiving the data from the scanner.
On top of that you can do more fancy stuff using the scanner driver and then have more control on it. As an example you can enable the scanner only when you actually need to read some data.
If you have more question about the scanner and how to use them, you can take a look at Zebra Technologies developer website Launchpad, that has an area on this technologies.
Disclaimer: I work for Zebra Technologies.
I have been asked to develop a C# Winforms application that reads barcodes and processes data based on products with the relevant barcode.
The barcode scanner we're using is a Symbol LS2208 usb scanner and when it came there was no instructions or cd in the box. We plugged it in, it beeped at us and were were able to scan barcode values into notepad as a test.
In my application, how do I ensure that the scanner populates data into the relevant textbox (I've been setting focus after every other action such as button clicks etc) and how do I know when the entire barcode has been scanned? Currently I have a form timer that ticks every 50ms and checks the length of the textbox value. If it stops getting bigger, I assume the entire barcode has been written.
It just feels a bit "clunky" and wondered if there was another way to do this?
Distinguishing Barcode Scanners from the Keyboard in WinForms
Check out this thread. There's everything you need there.
If you'll be using this particular scanner, you can setup it to send a specific signal at the end of the input. To setup your scanner gun you need to read the documentation for your device, probably provided on the website of the manifacturer.
Another solution if you will be using the same scanner gun.
If your clients are going to use a lot of different scanners, it would be slight difficult to set everyone of them and track their input. In such case, you have to do it with counting the time between the keypresses (Windows cannot distinguish between barcode scanner and normal keyboard). But you still have to know the suffix of the input the scanner sends.
Most barcode scanners send a couple of control characters before and after the actual barcode data, usually something like ^B and ^C.
Take a look at what keys its actually sending by listening to the keypress event and watch for what control characters it sends. Then you can be sure when the barcode data begins and ends.
Motorola Driver and SDK for Scanners
Sounds to me that Motorola actually have a SDK for this kind of thing with a driver specific LS2208.
Lot of documentation:
Motorola LS2208 Documentation
Seriously, google moar!
The symbol or Motorola LS2208 is a pretty standard barcode scanner.
LS2208 on RJLTechnologies.com
However the issue with what you are doing is not the scanner it may be the way you are approaching the entire application from the foundation which relates to the barcode being used.If there are multiple layers of information that need to be gathered from a single code maybe it would be better to utilize a 2d barcode maybe a data matrix or something to that effect.
additionally parsing would be simplified and you can use the symbol/motorola adf pre existing library to program the scanner outside of the application either through programming barcodes or you can use the scan utility 123SCAN2 from Motorola Solutions. This means that your application is a bit more flexible is not tied down to a particular scanner and gives greater flexibility to use what ever hardware is needed instead of a codependence on a particular brand or scanner.
regards,
You want a solution that will be used to do some sort of actions after the barcode is scanned. You want to do something just after scanning a barcode by your barcode reader, right? Then this will help you more.
Write the keyPress event for the textbox which is used to scan the barcode. Now if you write any code there it will be executed every time you presses any key from keyboard or every time when barcode scanner reads a character. If you want to execute some code after the barcode has been scanned, you need to add on condition in that keyPress event. Barcode scanners has the return character (\n) associated with every barcode scan. So you need to add this condition in keyPress event. Below is the code for your reference.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == (char)Keys.Return)
{
MessageBox.Show( textBox1.Text + " scanned...");
//write your code here
}
}
}
I had some questions in this scanner using WIA or TWAIN in C#.net. We are planning to buy Kodak i920 Scanner to scan Image through our Application in C#. My questions are
1 . Is it possible to scan an image in single click by using any one of the drivers. ( I dont want select device dialog and image settings dialog)
Some scanners has inbuilt OCR functionality. can i use that OCR function programatically of that scanners. So that when i click on OCR button the scanner has to scan an do an OCR and revert me back. Is it possible to do this?
Yep. You certainly could do all of that provided you could be certain that the same scanner was going to be available for every scan so that you could always just force use of the device you wanted. You can also pass along the settings you'd like the device to make use of provided that the device says they're supported. A number of SDKs either free/opensource or proprietary exist that would allow you to do that in c# -- Atalasoft, Dynamsoft, and Twain.Net provide one to name a few.
I have two devices(KeyBoard and BarCodeScanner) and 2 textboxes(text box 1 and text box 2).
Now I want to restrict user that he can only use keyboard in text box 1 and barcodescanner in text box 2.
How is this possible in C#?
You should have a look at this: Read data from Bar Code Scanner in .net (C#) windows application!
So your scanner might send special characters to help you identify it the input was from a scanner, or maybe it provides you with an additional library you could use to detect such events.
Let's suppose thought the scanner acts identically to a keyboard without any special characters to help you know it was from a scanner and without any additional library from the manufacturer site you could use.
Then what you could use is: measure the typing speed in the KeyDown event of the second textbox.
I suspect the scanner enters the code instantly so you would have a huge typing speed measured.
Then if the typing speed is greater than a threshold ( E.g. for humans the world speed record is somewhere around 1000 characters per minute) then you delete the text that was entered.
It's hacky, but I've got no better idea.
I worked with barcode scanner only once. In my scaner was possible to force it to generate special control sequence before it pass input to computer. This behavour was mastered through scanner's native software. But I cant specify any details because of I didnt participate in customizing - my colleague customized it before me .
In my case scanner sent Ctrl+J before scanned date and I was able to determin from which source input come from keyboard or from barcode scanner.
It depends on how the scanner is connected I guess. If it's just wired in between the computer and the keyboard, you're out of luck, since there wouldn't be any reliable way to distinguish keyboard inputs from scanner inputs.
If it's connected separately there must be some means to get at the scanner data, maybe by way of a class that the scanner software provides, so you have to use what's provided there and put whatever you receive into TextBox2.Text. As for disabling the Keyboard input for this box, you could simply prevent any input by setting TextBox2.ReadOnly = true.
I have Motorola MC55 with Windows Mobile 6.5 on-board. This nice palm contains also an embedded bar-code scanner. My question is - Will I need anything special in .NET CF in order to use the bar-code scanner? I would expect that the bar-code are read as normal strings and delivered as keyboard events? Is any special .NET CF library necessary?
Thanks for help
Dominik
That entirely depends on what you want to achieve.
Handheld barcode scanners based on Windows Mobile usually come with a piece of software that translates barcode module output to keystrokes -- you can put it in the autorun folder and then handle text input in your textbox.
Alternatively, there's usually an SDK that contains libraries with which you can hook the scanner directly and have all the additional information (type of the barcode, binary data etc).
We use MC9090 here, and we went the SDK way. Works like a charm. The SDK can be dowloaded here. If the link doesn't work (I had to crop it), go to the seach form and search for "SDK".
Usually, for Motorola (earlier Symbol) scanners there's a set of libraries for the Comapact Framework including samples.
We use mobile devices a lot with our customers (not only Motorola) and I strongly advise against using keyboard emulation if possible, as you will run into trouble when there are multiple input fields (or no input fields at all). Also, you will not be able to detect special characters within barcodes when you get them through keyboard emulation.
Link to SDK is provided by GSerg in his answer. I strongly recommend using the SDK as it provides access to other device functionality as well.
There's a utility for these devices called DataWedge that lets you treat the built-in scanner as a keyboard device.