work on asp.net 08 C#.I would like to develop a web application that scan documents into the following format(pdf,tiff,jpg,gif.etc) .My scanned images/file will be at client computer.
Have you tried using an 3rd party scanning control such as LeadTools? I have used those controls in the past and worked wonderfully.
Brining in a scanned document through the browser goes beyond the basic functionality of the browser.
If you must stick with ASP.NET, you might consider writing an ActiveX control (IE only, I think) that can handle the scanning and interact with your web page.
You might also consider Silverlight. Although I don't think it can handle the scanning directly, you should be able to interface with COM components installed on the system to handle scanned streams.
The wording is sort of ambiguous. Is the scanner on your side or the client's side? I understand that the result of the scan is saved on your client's side.
I assume that the scanner is on the client's side...
You can't access peripherals [ie: a scanner] via standard JavaScript... You can take advantage of ActiveX for IE only.
Why not write a small winforms application in c# and let your client download that?
By the way, if the client has a scanner on his/her side, the scanner will likely have come with software to manipulate the scanner...
Related
I was looking for a solution to sign XML using unexportable private key (this require passphrase/secret password to be informed by user input for create the hash using it) contained in usb token (smartcard etc) for a web application. I have made a c# class library to make this but obviously the code is executed in server-side, so I can't access the usbtoken/smartcard of the client over internet, unless it's plugged in the server pc (so my solution may be installed in local network of my customers and the usbtoken plugged in server's usb. It's working like that today but I want to change this for the customer use its token in his machine)
I have created a code using SignedXml, X509Certificates and other classes, to achieve this, but I was looking for equivalents in silverlight class library for encapsulate all this things and execute it in client side, but unfortunately SignedXml can't be used in Silverlight (not exists..).
I have created an ActiveX for doing this successfully but my solution now only works in Internet Explorer/Windows, and it's not very easy to maintain because of my business logics.
Anyone can help me with this please? Any suggestions are very welcome.
If I can port my activex solution to silverlight, or if its possible to do that using other MS Technology that can be executed in other browser/OS.
Sorry for bad English, not a native speaker. Thank you.
Java applet is a better option than the ActiveX.
Silverlight won't give you access to certificate storages, and its development has stopped (Silverlight 5 is officially the last version).
Our company offers a ready to use solution for distributed cryptography which includes ActiveX, Java applet and Flash module for client-side activities. This solution is discussed in details in this answer.
I have a qt main-window application from which several dialogs are accessed.
I implemented the server and client versions of the application using tcp/ip using c socket programming.
But now I have been told to make the application accessible to any web browser after username and password have been given using QHttp or any appropriate class.
I'm a beginner and have no idea of implementing this. Could anyone give some tips or examples.
I'm using qt 4.6.2
I'm not sure I understand you. You have a Qt main window which contains some widgets arranged in a GUI. You want those same widgets to be accessible inside a web browser? Then you need to re-create all your GUI code in HTML, CSS and JS.
Your Qt app can use QHttp to listen for incoming client connections. When one of those comes, you reply with a webpage (written in HTML, CSS, JS). When this webpage is received by the user, his browser will display it. When the user interacts with the webpage, you'll probably want to send some data back to the Qt server eventually. You can do this either via form posting or via XMLHttpRequest.
You should know client-side web development is not that simple. Even when you know your languages, there's lots of things to learn about browser compatibility, security, accessiblity, JS app architecture, etc.
You want to make your application into an Http server. Here is an example using Qt to get you started:
http://doc.qt.nokia.com/solutions/4/qtservice/qtservice-example-server.html
As Stefan notes, this means putting your GUI into HTML/CSS/JS and more.
I'm contemplating adding a voice recording to some posts on my site. I'm wondering if there is an ASP.NET library out there that will allow me to:
Press a button to start recording
Record what I'm saying through my comp's built in microphone
Save the file as a .wav or some other popular sound file
As of now, I will be the sole user of this function, but it would still be nice to have in my bag of tricks in case I want to pull it out later for a client.
It is not doable without the help of a plugin. Browsers simply don't support voice recording.
You could choose from:
Make a SilverLight applet.
The flashPlayer can record too.
find a java Applet that can do this.
Make an activeX Plugin (since you have affinity to asp)
use your os provided voice recorder, save the file and upload it. Playback via browser is easy
You solution will involve a flash componet (outside of rendering the markup that invokes the flash component). The ASP.NET stack won't be able to do it. Silverlight doesn't seem able to do it.
Here is how.
Here's the problem: the browser does not allow this level of hardware access by an application. You could however achieve this either through Java, Flash or ActiveX (Yuk! don't do it) should the end user allow the access to occur however there are a number of cavaets. Here's a great thread where like-minded people like yourself are approaching the same challenge:
http://drupal.org/node/69242
If I were cornered to do this I would create a signed Java Applet.
not directly from asp.net since asp.net is server side and you need access to the client side microphone - however the new adobe flash player has the ability to access the mircophone so in theory you could use flash to record then upload to your site.
See ListenUp sdk. I found a bulletin board called english-test.net that is using the sdk to post voices.
You'll need some client-side code to achieve this as regular HTML doesn't support audio input and upload.
The ActiveX control Active Audio Record 2.0 claims to support recording audio and uploading it to an ASP.NET web server. I've never tried it though.
I am going to develope a module in ASP.Net. In this module I want to get the list of drives of the local system where this page is displaying. I have already tring with System.IO.... etc. but it gives me the server drives.
I want to get the list of LOCAL drive where page is displaying on server drives.
Thank you.
Do you mean the client's computer's drives?
That is not possible.
EDIT: However, it is possible with ActiveX or a browser plug in.
This absolutely cannot be done with neither server-side ASP.NET, nor with client-side JavaScript. You can try writing an ActiveX "control" (or how are these called?) or Java applet.
Fortunately you can not do that.
This is impossible, since your ASP.Net code runs on the server. The client only sees the rendered page (HTML and javascript).
Remember: your C# or VB.Net code runs on the server for the explicit purpose of sending html/javascript to the client browser. It does not get to peek directly at the "local" system, and the only thing the "local" system knows about is the html/javascript rendered on the server. That's just how the web works.
Furthermore, javascript runs in a sandbox that does not include any way to enumerate the local drives. This is by design.
So the only way to do this is via plug-in like flash, silverlight, or activex.
You can write a .NET control which is downloaded from your website to the clients' PC and looks at the drives there. As this could be abused (you could steal the users' files) you will have to convince the user to download the control in the first place. Look here for more info:
ClickOnce Deployment overview
I am working on an ASP.Net application and I want users to be able to take a picture with their local webcam and then upload it to the server.
I can, of course, rely on users doing this manually via their locally installed software, save the image as a file and do a normal file upload. However, what I really want to do is incorporate it all into a UI in the browser.
I know this means accessing local resources so do I need an ActiveX control or Silverlight or is there something I could do in Javascript for example?
This is initially intended for an Intranet app so I can have control of the client's environemnt, including stipulating the browser etc, which means I can use an ActiveX control if I have to. However, it would be nice if I could write this in a generic way so it could be used in an internet app generally (happy to stipulate that it only works on Windows clients but would be good to get it to work in FireFox).
Thanks.
The only acceptable and universal way to this for now is Flash/Flex application. Flash player presets literally in every browser in the world and all of them has such capability.
VideoCap Pro is quite popular, and it offers an ActiveX version, have you checked it out?
This sounds very suspicious to me. You realize the nefarious applications this could be applied to, right? A web page that when a user browses to it, unknownst to them, their webcam snaps a pic of them. ... I don't like it.
You could use the Nimbb API to do the webcam video recording inside a browser.
It is possible to get the image from client webcam in asp.net, you have to install the Silverlight 4 with Visual Studio 2010:
Go to following link:
http://wildermuth.com/2009/11/23/Taking_a_WebCam_Photo_with_Silverlight