I dont want data to be displayed in textbox or some other controls, i have to read the barcode data using USB port.
I have to create .net core application to read the barcode scanner data using .net Core.
A barcode scanner is just a 'fast' keyboard. A application sees it as a keyboard. If you open notepad and scan a barcode you should be able to see the scanned code.
I need to use barcode scanner as camera to take images and save them using c# application (WinForms). I am using Zebra scanner SNAPI. And I have few questions.
Can I use barcode scanner as web camera connected by USB and how can I do it?
Is there general API for barcode scanners? I was trying to use Interop.CoreScanner.dll but, I had a problem with taking images and saving them.
PS.
I need to write general application where I can use different barcode scanners.
The typical barcode scanner emulates a keyboard and simply delivers the recognised characters. Since it is also specialised for edge detection I doubt, that necessary hardware modifications will be feasible.
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.
I've been thinking whats the best way to handle a barcode scanner via code. The thing is, I have 3 different pattern of barcodes in one window/dialog. before I put these barcodes in the right field i should be able to handle the barcode scanner programmatically. similar to how we handle others devices via serial port. But my barcode scanner is detected as HID instead of COM. what should i do? I've tried the Point of Service for .Net but it doesn't recognized the scanner. Point of Service always returns "Simulator devices" and not the actual devices installed on the PC.
I understand that my barcode scanner detects as a keyboard. but the thing is that I want to control it programmatically to place the right barcodes in the right fields.
I have made a Windows Form application with a textbox. I will force users to use the barcode scanner, so the keyboard input should be disabled. The KeyPressed event does not work, because is also disabled input from the barcode scanner.
I thought maybe I can set a timer on the TextChanged event, but I do not really know how it works.
Have someone a good idea?
Based on your description, I assume that your barcode scanner is an HID barcode scanner. If so, there is no easy answer here because the barcode scanner functions exactly like a keyboard. Disabling keyboard input will disable the barcode scanner.
I have done this before, and there are a few solutions I know of:
Use a barcode scanner that is not an HID barcode scanner. Ex: Serial, or something like that.
Configure the barcode scanner to send a special character at the start and end of the barcode scan. (This is something you can do if you have the manual for the particular model of barcode scanner.) Write your KeyPressed event to listen for these special characters as a signal that it is getting data from the barcode scanner. When it sees them, enable and disable the text box.
Use Windows API calls to communicate directly with the barcode scanner. This requires knowing the VID and PID of the barcode scanner, and some detailed knowledge of APIs like GetRawInputDeviceInfo, GetRawInputData, and RegisterRawInputDevices. This is very powerful, since you can receive barcode input from anywhere in the application, but it is very complex.
However, one caveat: You probably don't want to disable the text box at all. What if the barcode is damaged and the scanner cannot read it? You always want the user to be able to manually enter the barcode. Next time you go through the cash register at a store, notice that there is always a way to manually enter the barcode.
You can find the way to check with keysUp and Keysdown event.
Check here for detailed answer.
Check here for answer
Check here for github code