Develop Reference

Implementing a Postek Printer on my .NET c# application

So i created a .net c# application that does store article codification, and also bought a Postek c168 barcode printer, and i want to create a section on my application that prints texts and images to the direct thermal labels with the printer, i also downloaded a dll file for developers on the official printer website, my question is on how to use the dll file or how to implement the printer on my application.

Downloaded SDK contains the manual for SDK functions "Postek API Manual_CDFPSK V3.01.pdf". I do not want to be sarcastic, but maybe you should start reading that document first.
My initial observation is that DLL contains some native functions that you can call over interop.

How to store fingerprint scans on my computer instead of inside the scanner?

I would like to know if there are fingerprint scanners which doesn't save locally their fingerprint data, but they just send raw data to he attached computer.
If yes, which type of scanner should I use? I would prefer to use c# as programming language of the handling application, but as long as handling fingerprints on pc is possible I will learn any language you'll raccomand me

All the fingerprint scanners that I have seen, allow you to save the fingerprint data (locally). Without doing adverts for any readers, the following "desktop" device groups work for a fact, as I have them:
digitalpersona (4000, 4500, 5100), Futronic devices (FS80h, FS88,..), UPEK EikonTouch (I can't locate the model number of the one that I am using.). There are larger, more expensive devices such as the Cross Match L SCAN Patrol, Suprema RealScan-G10, etc. from which iamges can also be read and saved.
The important thing is that SDKs are provided that allow you to interact with the readers: capture fingerprint image data which you can then save to a file or to a database. I am not sure about C# though: my exposure to SDKs is limited to C and Java.

ASP.net C# image processing

I am designing a website for PUBLIC TRANSPORT TICKETING SYSTEM using ASP.NET c# and MSSQL..So when a customer registers in the site, I want to send SMS with a barcode to him to use that in the bus to validate him..
so in the bus there is KIOSK and also a barcode reader..When he get into the bus first he has to validate himself..
So i want to implement this : when the passenger shows the image of the barcode in his mobile the barcode should compare it with the database and if it's validated proceed if not give an error message..
plz consider my question and kind be enough to reply..
Thank alot..

Usually barcodes are compared as strings, not as images. Note that it's not recommended to store the barcode as image in the database. You simply can store the barcode value (string) in the database and compare it with the barcode recognition result.
We currently generate barcodes (Code 93) using a 3rd party toolkit named leadtools. This toolkit gives you the ability to read\write common barcodes. For more information, see the following link:
http://www.leadtools.com/help/leadtools/v175/dh/to/leadtools.topics.barcode~ba.topics.programmingwithleadtoolsbarcode.html

Barcodes are NOT generally implemented by image comparison.
Rather, the barcode evaluates to a string or number, which is then a PK into a backend database somewhere.
(Eg, check on any product in your kitchen pantry. The barcode will often have a human-readable version of the number that the barcode represents, written below the barcode).
You've specified there's a barcode reader in place... This will do the "heavy lifting" of reading the barcode and passing the resultant string/number into the system.

What fingerprint formats are returned by WinBioCaptureSample?

I've got a C# application running on Win7 and a USB fingerprint scanner. I'm talking to the scanner via Windows Biometric Framework (WBF). WinBioCaptureSample() gets me something, a lot when I ask for _RAW, a little when I ask for _PROCESSED.
I assume that "raw" is an image and that "processed" is a template, but what formats are they using??
I need the sample as either an image (any standard format) or an INCITS-378 template, and Microsoft's docs don't say if that's possible. I can't even figure out how to use the offsets in the WINBIO_BIR_DATA structure to find the data in memory.
I note again that this is C#, not C++.
Any clues?
Edit I'll settle for any sample code that calls WinBioCaptureSample() (other than what's on MSDN).

from MSDN:
The BIR is compatible with the Common Biometric Exchange Format Framework (CBEFF) defined by NIST 6529-A.
Source: MSDN
NIST 6529-A
This Presentation has a great description of the BIR format byte by byte..

How to generate barcode from a string using C#?

Is it possible to generate barcode from a string
using c#?
Is there any builtin classes for generating barcodes in asp.net?
Is it possible to detect a barcode printer connected with a system?

Yep. Of course it is possible. :-)
As far as I know there are two ways to generate bar codes:
Using a special bar code font (try to google for "barcode font free")
Render the bar code to an image and display that (try using the Barcode Rendering Framework available on github)
In response to your updated question about detecting barcode printers:
I think a barcode printer will show up as a regular printer on your system. At least that is how the devices I have played with have worked.
This means that you can detect a specific barcode printer by enumerating the installed printers on the system and looking for the specified device, but in most cases I would suggest that you let the user specify the printer himself using either the standard print dialog or using a custom dialog.

Is it possible to generate barcodes from a string using c#?
Yes, it is. There are quite a lot of frameworks that do it - either as a font or an image.
Is there any built-in classes for generating barcodes in asp.net?
No, but this c# project on github allows a string to be converted into an image (even multiple barcode types). All you need to do then is display the image in your application, just like any other image.
Is it possible to detect a barcode printer connected with a system?
Yes, in a WinForm application, for example, you could use System.Drawing.Printing.PrinterSettings.InstalledPrinters.

to detect if you have printer installed then you may simply enumerate available printers using:
System.Drawing.Printing.PrinterSettings.InstalledPrinters

Is it possible to generate barcode from a string using c#?
If you want a C# barcode generator that can create your desired barcode type in a single line of code, you can use IronOcr.
// Create A Barcode in 1 Line of Code
BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode", BarcodeWriterEncoding.QRCode).SaveAsJpeg("QR.jpg");
The result can be exported as images, bitmaps, binary data, streams, stand-alone HTML image tag, Data Uris, PDFs or HTML.
If you need more advanced barcodes, QR Codes with logos - these are also supported.
Disclaimer: I work for Iron Software, makers of IronBarcode

Yes, it's possible using C#.
No, there are no built-in classes. But there are 3rd-party libraries.
For example, a free cross-platform C# library Gehtsoft.Barcodes for generation of different types of barcodes and QR codes from string into image. You can find it in nuget.
Moreover, you can generate barcode directly into PDF document with Gehtsoft.PDFFlowLib.Barcodes C# library (it uses Gehtsoft.Barcodes library automatically). It can also be downloaded from nuget.
DocumentBuilder.New()
.AddSection()
.AddParagraph()
.AddBarcode("4810151021665", BarcodeType.EAN_13)
.ToDocument()
.Build("Result.pdf");
Using this libraries you can generate barcodes UPC-A, EAN-13, EAN-8, GS1-128 (Code Sets A, B, and C) and QR codes (variants 1-40, four levels of error correction available).
Here is a tutorial with many examples: Adding barcodes.
Note, that Gehtsoft.PDFFlowLib.Barcodes library is an extension of PDFFlow library for generation PDF documents using C#.