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Thanks Luc,
But I don't have the source-codes of existing program, and also the program is one of the terminal module of ERP system. So i cant modify the existing application. I have to write a new program that simulates with the existing program, But I am not getting any idea to implement it.
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you might still be able to apply ny idea from outside the app by installing a global keyboard hook (see some articles on CP). I suggest you make a little utility to do so, and keep it accessible in the system tray, so you can re-enable keyboard processing when things would go wrong.
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Thanks again.
I think it will completely disable the keyboard, but in my case user have to do some entries in the program after getting logged in by scanner. So how could I synchronize my external application with the existing application, so that it will enable the keyboard after scanner scanned the barcode and authorize the user. And also how could I disable the keyboard again when user finished his work and logged out (Log out is based on Y/N confirmation message).
Is any way to do it.
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I used to work on those things in a retail store, and I doubt that there's a way to do it with your current setup. The wedge is simply a term used in the industry that means "we wired two serial devices in parallel so we wouldn't need a separate jack." That's literally how they're wired! The computer (or terminal) has no way to tell which device is sending data. The only suggestion I can make is to select a special character to insert in your authentication barcode which the scanner can produce, but the keyboard can't.
For instance, very few people remember that ctrl-G was used to ring the bell on a remote teletype, and DOS-based PCs kept it to beep the internal speaker. But nothing in Windows uses it, and there's no reason you can't make a scanner read it, if you have a barcode format selected that allows the full ASCII character set. You might use it as a delimiter between the username and password, for instance. Nobody would think of trying to manually type that today.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Thanks Mr. Wright, but then how could I merge this logic with my existing application, because I don't have source-codes. Or I create separate program that detects every input, of the system, then distinguish scanner and keyboard inputs on the basis of special characters. Is it possible. 
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Yes, it is possible, but I'm not a good enough programmer to tell you how to do it. Maybe someday...
Since you can't change the existing program, you need to create a keyboard hook that intercepts inputs from the keyboard port before your existing program gets them, process the data, then pass it on to the usual handler. I believe there are articles on CodeProject that describe how to do that, but I'm not smart enough yet to help. The method I suggested may not be the best way to do it, but my point was that Windows does not have a way to tell where the input is coming from; you need to provide some distinguishing feature that you can grab and process. Whatever you can do to make the scanner input look different from a regular keyboard input will do the job. All you need to do is catch it and process it.
Search the articles here, and I think you'll find an answer. I look forward to reading the article you write about the solution one day soon. And, by the way, I'm Roger to my friends, not Mr. Wright, and I consider all my associates at CodeProject friends. Welcome to the neighborhood, Ravi. 
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Thanks Roger, I will definitely try this, and let you know.
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You're welcome, and be sure to check Dan Neely's response below. H provided two excellent references.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Good references, Dan!
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Please help....
I use RASAPI32.RasEnumDevices to determine which RAS devices (ISDN or Modems) by name and type are connected to my computer. I use System.IO.Ports.SerialPorts to list all of my COM ports which also shows if a modem device is connected. I use these devices in connecting to the internet. The phonebook entry for the device is created on-the-fly.
What I need now is to put it together. How or where can I find out in WIN XP which RAS Device name is on which port. I need the port for issuing AT commands. I use an analog modem, an ISDN FRitz Card and a UTMS modem card.
WMI.POTSmodem does not list any of these devices.
Coding is in C#.
Ralph
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Hi,
I don't know if it is the right place to ask this question, if it a'int kindly guide me to the right place.
Problem:
I have a Live raw video feed from a camera connected to a video capture card which doesn't support hardware based video compression, so i wish to use some software based compression technique.
I have an nvidia Graphic Card (8400 GT). I wish to inquire whether there is any video codec currently available which i can use to do a Live GPU based encoding of the raw video feed. And does ffdshow currently supports GPU based encoding.
Any help will be greatly appreciated.
Thank you...
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Hi,
I want to ask where to get a wireless device to have a hotsport just like the one they use in costa coffee and other coffee shop where you buy and then they will print a receipt contains user ID and password which allows you connect to the internet?
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I have also seen the same in some hotels like sheraton?
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Try a wireless hotspot shop.
Morality is indistinguishable from social proscription
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I want to ask what operating system runs on ATM?
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Again, anything you want... Linux, Windows NT or better, ... They are just PC's with custom hardware...
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I want to ask what operating system runs on Kiosks?
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Again, anything you want... Linux, Windows NT or better, ... They are just PC's with custom hardware...
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I want to ask what programming language they use for ATM?
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Same answer as before... anything you want.
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I want to ask what programming language they use for Kiosk?
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Depends a bit on the application, but there is no one langauge used for any app in a kiosk environment. You can use anything you want.
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I made a web application for a kiosk machine in ASP.NET and I used Sitekiosk to run it is kiosk mode "lock the keyboard and to open the URL in full screen ..etc". But if you could make a windows application and run it in kiosk mode then it would be better especially if your application needs to print something.
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hi there, i have a P4 of CPU 3 GHz(2MB L2 Cache ), MBord Albatron PM945 (phonix Award BIOS v 6.0 PG SMBIOS ver 2.2, PCI bus ver 3.0), 1 GB RAM, video Intel 82945 .
I let my PC open somedays as an alternate server for a vb net SQL server system -there was windows xp professional 2002 upgraded to sp3 2007 - then i found some virus behaviours although there was Antiver 2010 free version. unfottunately i tried many times to install windows again but no use it hangs while loading setup files from CD I began by changing HDD, and I tried changing both CD and CD drive but no use, I also replaced the RAM module with another working one. Finally I used Hiren boot utilities to check all PC activities : RAM, CPU, ....,...... . I feel hopeless. can any one give a hand ??.
ezzat oraby
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