I am working on cloud storage system in ASP.Net MVC5. In which I made a file manager that handles cut,copy,download multiple files,edit and preview of files, but I want to edit documents like word files in real time (collaborative editing)..is there any api that can help me accordingly.
Thank you in advance.
you should use Signal R for real time applications...it may be possible with the help of application user interface but its better to write your own code according to your choice...
[http://signalr.net/][1]
dev_express and syncfusion may be your solution..try these..
This is turning into a huge comment, so I'll just explain my point of view in an answer. I'll remove it, if I see an actual answer appears.
I am suggesting you start writing your own code for collaborative editing and the reason is quite simple. You need at least slightly different processing for almost each file type, which suggests there will never be a single API to support collaborative editing for all file types, unless somebody makes it their goal to maintain it and keep up with every one created.
Start it simple, text (or hex) editing. Define how changes are made and implemented on other clients and then work your way to add as many file types (and methods that go with them) as you need.
You could use source code of 1 of these open source collaborative text editors (you'll have to find download / Github links on their websites) to get a general idea how to do it, but you will still have to put in some work and won't go far without creating your own code.
Collaborative editing requires user 1's (who just started editing) client to send either one of these:
Data pointing to changes made in file
Full file, and user 2's client (or central "server") should be able to calculate the changes made from there and implement them.
One of the problems is to overwrite only that portion of the file changes were made to (and avoid overwriting the other user 2's work).
And the biggest problem (the reason you can't have "1 for all" method/API) is each file type has its own structure meaning that different file types will have different data representing changes in file. If you try to write raw data it might work, but you'd still need to calculate and lock away specific portions of file, that contain general information, rather than data of your file.
I need get the html code this site (with C#):
http://urbs-web.curitiba.pr.gov.br/centro/defmapalinhas.asp?l=n (only works with IE8)
Using the WebClient class, or HttpWebResquest, or any other library, I do not have access to the html code generated dynamically.
So my only solution (I guess) would be to use the WebBrowser Control (WPF).
I was trying and trying, using mshtml.HTMLDocument and SHDocVw.IWebBrowser2
but it is a mess, I can not find what I want on it
it seems there are many "iframe", and inside there are more "iframe".
I do not know, I tried:
IHTMLElementCollection elcol = htmlDoc.getElementsByTagName("iframe");
var test = htmlDoc.getElementsByTagName("HTML");
var test2 = doc.all;
but had no progress, does anyone know how to help me?
Observation / trivia: This is the site that shows where all bus pass in my city. This site is horrible, and only works in IE8 has serious problems. I would like to use this information to try to create a better service, using google maps or bing maps posteriorly.
The site that I was trying to get the information is no longer available, the idea to get dynamic html source code was abandoned and I cannot found the solution using a WebBrowser Control for WPF.
I believe that today there are other ways to solve this problem.
You need to use the "Frames" object in the WebBrowser control, this object collection will return all frames and iframes if I recall correctly, and you need to look at the frames collection for each newly discovered frame you find on the page, get me? So, it’s like a recursive discovery loop that you need to run, you add each frame you find to your array or collection, and for each "unsearched" frame, you must look at that frames ".Frames" collection (they will all have a .Count etc, just a typical collection) and you do this for every newly discovered frame that you find, until of course, there are no longer any newly discovered frames that haven't had their ".Frames" collection searched.
So, the function, if done as per above, will allow for infinitely nested frames to be discovered, as I've done this in a VB6 project (I'm happy to give you the source for it if you would like it). However, the nesting is not preserved in my example, but that is ok since the nesting structure isn't important and you should figure out which was what by the order of the frames that are added to the collection since the order is related to the hierarchy of the frames being added.
Once you do that, getting the html source on this is pretty straight forward and I’m sure you know how to do, probably a .DocumentText depending on the version of the WB control you are using.
Also, you say it is not possible to use the HTTP clients to directly grab the source code? I must disagree, since once you have the frame objects, you can get the URLs from each frame object and do a URL2String type call to get the URL and turn it into a string from any httpclient-like class or framework. The only way it may be prevented on their behalf if if they accept requests only from a particular referrer (ie: the referrer must be from their domain name on some of their files etc), or the USER_AGENT where if it isn't one of the specified browsers, then it is technically possible that they will reject and not return data, unlikely but possible.
However, both referrer and user_agent can be changed in the httpclient you are using, so if they are imposing limits based on this sort of stuff, you can spoof them very easily and give them the data that they expect. Once again, this is low probability stuff, but it is possible they may have set things up this way especially if their data is proprietary.
PS: My first visit to the site ended up in IE crashing and reopening that tab :), terrible site I agree.
I have a timetable in memory, and need to be able to print it out.
The timetable will likely be many pages, each page will look quite similar:
A grid of cells, across the horizontal axis is time, and along the vertical axis is entities. Cell x, y will contain the allocation of a particular job to entity x at timeslot y.
I'm looking at the System.Drawing.Printing.PrintDocument class but it's incredibly cumbersome. I need to set an event handler to the PrintDocument.PrintPage, yet there doesn't appear to be any way to get the page number from the PrintPageEventArgs?
I just want to construct my document and call some Print() function. I suppose if I could get the page number within the event handler, I could construct the page layout on the fly with e.Graphics and GDI.
I could potentially even put together a HTML page using tables and print that - if I could somehow control what prints on what page?
Is there a better way to construct and print documents in C#?
The target machines do have Office installed, but they're all different versions and I've had lots of trouble getting correct versions of the .Net/Office interop library to work with them.
Edit: I could potentially even create a temporary LaTeX file on the fly and compile it, then print it. This seems like a good solution, except that the target machines are locked and the users can't install new software, hence I would need to bundle the LaTeX compiler with my program, and my compiler is almost 300MB.
Sounds to me like you're giving up too soon. Handling the PrintPage event isn't that difficult and since the event is raised sequentially, all you have to do is keep a page counter in that event. That's how I've done it in the past with MetaFile images (printing Reporting Services reports through a web service call).
I build a similar tool by using the Microsoft Chart Controls, easy to use.
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=130f7986-bf49-4fe5-9ca8-910ae6ea442c&displaylang=en
If you can save it to a file, you can use this here,
Print images c#.net
Quick 1 sentence summary: I wrote a demo app [download src here][1] that doesn't properly display sample data in the Visual Studio Designer and I need help.
After 6+ years developing in C# and WinForms, I've decided to use WPF in my current project. I've written a small demo application to teach myself and experiment with WPF (you can see a screenshot [here][1]). The app simply downloads and displays recent news stories from the Google News RSS feed.
My first attempt at this resulted in the class called "GoogleNewsWidget." After reading about the MVVM model, however, I tried again and built "GoogleNewsWidget2" that attempts to utilize a more MVVM-oriented architecture. I'm not sure which implementation is best as they both seem to be working fine on the whole (and though I'd appreciate comments on which is better, it is not my primary question).
My main problem is that neither play very well with the Visual Studio Designer. The GoogleNewsWidget2 loads and displays data fine when its xaml is opened directly but does not display correctly when embedded into another xaml file . The GoogleNewsWidget does not display data in the Designer in either case.
Any help would be appreciated. Again, the source is available for download [here][1].
Thanks,
Jon
[1]: http://abstract.cs.washington.edu/~jfroehli/reflect/ Demo App Source Code
PS My original post had multiple hyperlinks to screenshots but its posting was denied by StackOverflow for spam prevention reasons. Thus, I created the [1] url, which contains screenshots and a link to source code. If someone could also help me figure out how to use the "Markdown" language for linking, I'd be grateful. :)
Assuming that the VS2010 designer works the way Blend 3 does, you have to provide "dummy" data -- the designer won't pull data from external sources.
Create an object that implements the same interface as your datasource (view model) and fill it with static data. Make sure it has a public, no-arg constructor.
Define it as a resource in your control, giving it a key like "DesignData".
In the root element of your control, add the attribute d:DataContext={DynamicResource DesignData}"
This will be used as the DataContext only when in the designer.
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I am working on a project right now that involves receiving a message from another application, formatting the contents of that message, and sending it to a printer. The technology of choice is C# windows service. The output could be called a report, I suppose, but a reporting engine is not necessary. A simple templating engine, like StringTemplate, or even XSLT outputting HTML would be fine. The problem I'm having is finding a free way to print this kind of output from a service. Since it seems that it will work, I'm working on a prototype using Microsoft's RDLC, populating a local report and then rendering it as an image to a memory stream, which I will then print. Issues with that are:
Multi-page printing will be a big headache.
Still have to use PrintDocument to print the memory stream, which is unsupported in a Windows Service (though it may work - haven't gotten that far with the prototype yet)
If the data coming across changes, I have to change the dataset and the class that the data is being deserialized into. bad bad bad.
Has anyone had to do anything remotely like this? Any advice? I already posted a question about printing HTML without user input, and after wasting about 3 days on that, I have come to the conclusion that it cannot be done, at least not with any freely available tool.
All help is appreciated.
EDIT: We are on version 2.0 of the .NET framework.
Trust me, you will spend more money trying to search/develop a solution for this as compared to buying a third party component. Do not reinvent the wheel and go for the paid solution.
Printing is a complex problem and I would love to see the day when better framework support is added for this.
Printing from a Windows service is really painful. It seems to work... sometimes... but finally it craches or throws an exception from time to time, without any clear reason. It's really hopeless. Officially, it's even not supported, without any explanation, nor any proposal for an alternate solution.
Recently, I have been confronted to the problem and after several unsuccessful trials and experimentations, I came finally with two viable solutions:
Write your own printing DLL using the Win32 API (in C/C++ for instance), then use it from your service with P/Invoke (works fine)
Write your own printing COM+ component, then uses it from your service. I have chosen this solution with success recently (but it was third party COM+ component, not own written) It works absolutely fine too.
I've done it. It's a pain in the A*s. The problem is that printing requires that GDI engine to be in place, which normally means that you have to have the desktop, which only loads when you're logged in. If you're attempting to do this from a Service on a Server, then you normally aren't logged in.
So first you can't run as the normal service user, but instead as a real user that has interactive login rights. Then you have to tweak the service registry entries (I forget how at the moment, would have to find the code which I can do tonight if you're really interested). Finally, you have to pray.
Your biggest long term headache will be with print drivers. If you are running as a service without a logged in user, some print drivers like to pop up dialogs from time to time. What happens when your printer is out of toner? Or out of paper? The driver may pop up a dialog that will never be seen, and hold up the printer queue because nobody is logged in!
To answer your first question, this can be fairly straight forward depending on the data. We have a variety of Service-based applications that do exactly what you are asking. Typically, we parse the incoming file and wrap our own Postscript or PCL around it. If you layout is fairly simple, then there are some very basic PCL codes you can wrap it with to provide the font/print layup you want (I'd be more then happy to give you some guidance here offline).
One you have a print ready file you can send it to a UNC printer that is shared, directly to a locally installed printer, or even to the IP of the device (RAW or LPR type data).
If, however, you are going down the PDF path, the simplest method is to send the PDF output to a printer that supports direct PDF printing (many do now). In this case you just send the PDF to the device and away it prints.
The other option is to launch Ghostscript which should be free for your needs (check the licensing as they have a few different version, some GNU, some GPL etc.) and either use it's built in print function or simply convert to Postscript and send to the device. I've used Ghostscript many times in Service apps but not a huge fan as you will basically be shelling out and executing a command line app to do the conversion. That being said, it's a stable app that does tend to fail gracefully
Printing from a service is a bad idea. Network printers are connected "per-user". You can mark the service to be run as a particular user, but I'd consider that a bad security practice. You might be able to connect to a local printer, but I'd still hesitate before going this route.
The best option is to have the service store the data and have a user-launched application do the printing by asking the service for the data. Or a common location that the data is stored, like a database.
If you need to have the data printed as regular intervals, setup a Task event thru the Task Scheduler. Launching a process from a service will require knowing the user name and password, which again is bad security practice.
As for the printing itself, use a third-party tool to generate the report will be the easiest.
This may not be what you're looking for, but if I needed to do this quick&dirty, I would:
Create a separate WPF application (so I could use the built-in document handling)
Give the service the ability to interact with the desktop (note that you don't actually have to show anything on the desktop, or be logged in for this to work)
Have the service run the application, and give it the data to print.
You could probably also jigger this to print from a web browser that you run from the service (though I'd recommend building your own shell IE, rather than using a full browser).
For a more detailed (also free) solution, your best bet is probably to manually format the document yourself (using GDI+ to do the layout for you). This is tedious, error prone, time consuming, and wastes a lot of paper during development, but also gives you the most control over what's going to the printer.
If you can output to post script some printers will print anything that gets FTPed to a certain directory on them.
We used this to get past the print credits that our university exposed on us, but if your service outputs to a ps then you can just ftp the ps file to the printer.
We are using DevExpress' XtraReports to print from a service without any problems. Their report model is similar to that of Windows Forms, so you could dynamically insert text elements and then issue the print command.
I think we are going to go the third party route. I like the XSL -> HTML -> PDF -> Printer flow... Winnovative's HTML to PDF looks good for the first part, but I'm running into a block finding a good PDF printing solution... any suggestions? Ideally the license would be on a developer basis, not on a deployed runtime basis.
In answer to your question about PDF printing, I have not found an elegant solution. I was "shell" ing out to Adobe which was unreliable and required a user to be logged in at all times. To fix this specific problem, I requested that the files we process (invoices) be formatted as multi-page Tiff files instead which can be split apart and printed using native .NET printing functions. Adobe's position seems to be "get the user to view the file in Adobe Reader and they can click print". Useless.
I am still keen to find a good way of producing quality reports which can be output from the web server...
Printing using System.Drawing.Printing is not supported by MS, as per Yann Trevin's response. However, you might be able to use the new, WPF-based, System.Printing (I think)