Trigger action in C# executable from web application
Hello, We have this web application (it's developed in C#, but that really does not matter), and part of it's functionality is to print some data on a specific kind of printer that's attached to the user's PC. The printer will print if a file to print is placed in specific configured folder in the PC's local file system. So the web app that resides in the browser, pretty ignorant about the PC where it is running on, needs to trigger a local process that will result in the file created in the needed place. Right now we go with rather heavy solution - a local webserver is installed and the web app passes the data to local URL, and the tiny script does it's thing - collects the data and creates the file in the needed place. I am now wondering if we could set it up in more elegant way: 1) Have a local C# app triggering regularly far web server "is there anything for printing". - pros: seems simple to implement - cons: regular far webserver triggering sounds like bad architecture. Also delays could be a problem. 2) Have a local C# app that acts as simple http server - pros: sounds like the most direct way to pass down info to local app from the browser - cons: potential security problems? Could be complex to develop? Maybe there is some other smart idea how a local process can be triggered from a web app? Passiday
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Passiday
12/8/2009 10:43:36 PM
dotnet.languages.csharp
1931 articles. 
0 followers.
3 Replies
992 Views
Passiday wrote: > [...] > I am now wondering if we could set it up in more elegant way: > 1) Have a local C# app triggering regularly far web server "is there > anything for printing". > - pros: seems simple to implement > - cons: regular far webserver triggering sounds like bad architecture. > Also delays could be a problem. > 2) Have a local C# app that acts as simple http server > - pros: sounds like the most direct way to pass down info to local app > from the browser > - cons: potential security problems? Could be complex to develop? > > Maybe there is some other smart idea how a local process can be > triggered from a web app? Why does it have to be a local process other than the web application? Can a web application not print? I see Javascript-based pages print all the time (or at least, invoke the print dialog so the browser can print). And I've seem web applications that can download and save files to my computer, so how is it that your web application cannot be designed to somehow place a file in the correct place? (These are rhetorical questions...I don't personally need an answer to them, I'm just asking them as a way of prompting some thought along those lines). It seems to me that you really should be asking your question in a newsgroup where questions about web applications are specifically on-topic. There you may find advice from someone who knows how your web application can directly handle the printing needed, rather than using an independent process the web application needs to communicate with. Barring that, certainly I'd agree that having a local program with which the web application can communicate directly is much better than having the web application notify a remote server that the local program is polling on a regular basis. As far as security problems go, I suppose it's true that any time you've got a process running that can accept data from an external source, there's a potential for issues. But using .NET, hopefully the biggest threat would be some kind of denial-of-service or abuse-of-service, and if you accept requests only from local IP addresses, that should be minimized. If I were you, I'd post my question to a more relevant newsgroup, and see if there is better advice from people actually writing web applications on a regular basis, including the possibility that someone can explain to you how to get the printing to work without a separate process at all. Pete
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Peter
12/9/2009 12:51:50 AM
If this is an intranet solution, you could investigate using using an HTA version of your web app. That way it will have access to the local filesystem. It could poll the webserver for the file info and do the writing itself. http://msdn.microsoft.com/en-us/library/ms536496(VS.85).aspx Tim "Passiday" <passiday@gmail.com> wrote in message news:fb546406-8a7a-4723-b8cb-8fc64a46bebc@a21g2000yqc.googlegroups.com... > Hello, > > We have this web application (it's developed in C#, but that really > does not matter), and part of it's functionality is to print some data > on a specific kind of printer that's attached to the user's PC. The > printer will print if a file to print is placed in specific configured > folder in the PC's local file system. So the web app that resides in > the browser, pretty ignorant about the PC where it is running on, > needs to trigger a local process that will result in the file created > in the needed place. > > Right now we go with rather heavy solution - a local webserver is > installed and the web app passes the data to local URL, and the tiny > script does it's thing - collects the data and creates the file in the > needed place. > > I am now wondering if we could set it up in more elegant way: > 1) Have a local C# app triggering regularly far web server "is there > anything for printing". > - pros: seems simple to implement > - cons: regular far webserver triggering sounds like bad architecture. > Also delays could be a problem. > 2) Have a local C# app that acts as simple http server > - pros: sounds like the most direct way to pass down info to local app > from the browser > - cons: potential security problems? Could be complex to develop? > > Maybe there is some other smart idea how a local process can be > triggered from a web app? > > Passiday
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Tim
12/9/2009 5:21:36 AM
"Passiday" <passiday@gmail.com> wrote in message
news:fb546406-8a7a-4723-b8cb-8fc64a46bebc@a21g2000yqc.googlegroups.com...
> [...]
> 2) Have a local C# app that acts as simple http server
> - pros: sounds like the most direct way to pass down info to local app
> from the browser
> - cons: potential security problems? Could be complex to develop?
This is easy to develop if you download the code for the Cassini web
server, which you can add to your project and compile together with your
application:
http://www.microsoft.com/belux/msdn/nl/community/columns/desmet/hostaspnet2.mspx
The original Cassini only accepts connections from the local machine,
buut since you have the source code you can search the one line where it
performs this check and remove it. Or better yet, change it so that it only
accepts connections from your web server; this should alleviate some of your
security concerns.
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Alberto
12/9/2009 7:57:56 AM
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Hi, I have planned to take MSCRM1.2 exams, Any one who has finished "Microsoft CRM Applications Professional v. 1.2", pls tell me the following details. what is the question pattern ? areas to be concentrated ? is there any programs to be written in the exam ? any model questions ? will there be any questions from installation of MSCRM ?(since it has seperate exam) what level of hands on experience is important to clear this exam ? is there any moc exams available ? Thanks in advance. Regards, You need to be totally familar with the entire application as it focuses more on funct...
VC Application to access network path file
Hi, all I have a question, my boss told me to write a application to run in a computer to access a file saved in a netwok path, but the computer do not have the permission to access that remote path, my boss's suggestion is : the App can create a connection by sending valid username and password ,and then can access that remote file. but the computer always can not access that network path. could anybody give me some helpful suggestions, thanks in advance! -jos I think your boss tolds you to use WNetAddConnection2. -- WebSite : Realization of Dream { imagine your dream} ...
CRZY SLOW! Every folder I click on, it's at least 1-2 mins to c em
Every folder I click on, it's like at least 1-2 minutes before I see a message on the screen. I imagine maybe it's because I have a lot of messages? I have about 20 e-mail accounts, and probably get about 50-60 messages an hour. (most are business accounts, and I get about 75% spam, which does get filtered & deleted, but still is there) So is that why it's just snail slow? Because I have so many messages? I try & move most of them ot the storage folders, but still, if I go to a folder that has more than like 50 messages in it, it takes minutes to load &...