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• null-coalescing operator or conditional operator

  - by rkrauter

  Which coding style do you prefer: object o = new object(); //string s1 = o ?? "Tom"; // Cannot implicitly convert type 'object' to 'string' CS0266 string s3 = Convert.ToString(o ?? "Tom"); string s2 = (o != null) ? o.ToString() : "Tom"; s2 or s3? Is it possible to make it shorter? s1 does not obviously work.

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• File I/O OS handling

  - by Albinoswordfish

  This isn't a direct coding question but more of a OS handling mechanism. I was reading somebody's previous question regarding C# and file handling. Apparently C# was throwing an exception regarding a file being locked when trying to access this. So my question is, does C# use an internal lock to handle file I/O between processes, or does the OS use some type of mutual exclusion for file I/O? From what I learned about operating systems, well at least unix, is that the OS doesn't implement any type of mutual exclusion for processes trying to access the same file.

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• Encoding in python with lxml - complex solution

  - by Vojtech R.

  Hi, I need to download and parse webpage with lxml and build UTF-8 xml output. I thing schema in pseudocode is more illustrative: from lxml import etree webfile = urllib2.urlopen(url) root = etree.parse(webfile.read(), parser=etree.HTMLParser(recover=True)) txt = my_process_text(etree.tostring(root.xpath('/html/body'), encoding=utf8)) output = etree.Element("out") output.text = txt outputfile.write(etree.tostring(output, encoding=utf8)) So webfile can be in any encoding (lxml should handle this). Outputfile have to be in utf-8. I'm not sure where to use encoding/coding. Is this schema ok? (I cant find good tutorial about lxml and encoding, but I can find many problems with this...) I need robust approved solution so I ask you seniors. Many thanks

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• itext - pdf to html

  - by Cristian Boariu

  Hi guys, I have spent about 20 hours of coding to produce invoices using iText in c#. Now, i want to use the same code to transform some of the tables to html. Do you know if i can do this? For instance i have this: PdfPTable table = new PdfPTable(3); table.DefaultCell.Border = 0; table.DefaultCell.Padding = 3; table.WidthPercentage = 100; int[] widths = { 100, 200, 100}; table.SetWidths(widths); List listOfCompanyData = (List)getCompanyData(); List listOfCumparatorDreaptaData = (List)getCumparatorDreaptaData(proformaInvoice.getCumparatorDreapta()); table.AddCell((Phrase)listOfCompanyData.Items[0]); table.AddCell(""); table.AddCell((Phrase)listOfCumparatorDreaptaData.Items[0]); and i want to transform this table into html... Is it possible?

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• CSS selector for grouped iterations

  - by snaken

  Hi, I have a number of elements that i want to loop through as groups. Consider this HTML: <input class="matching match-1" /> <input class="matching match-1" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-3" /> <input class="matching match-3" /> // etc I want a CSS selector that would allow me to loop through these as groups so there would be - using this example - 3 iterations of the loop (one for match-1, one for match-2 and one for match-3). The 1,2,3 etc is a variable used for grouping but this is not fixed so it cannot rely on hard coding of these values. Is this even possible? I'll be using jQuery or prototype not that that should matter really. Thanks

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• Does it make sense to have more than one UDP Datagram socket on standby? Are "simultaneous" packets

  - by Gubatron

  I'm coding a networking application on Android. I'm thinking of having a single UDP port and Datagram socket that receives all the datagrams that are sent to it and then have different processing queues for these messages. I'm doubting if I should have a second or third UDP socket on standby. Some messages will be very short (100bytes or so), but others will have to transfer files. My concern is, will the Android kernel drop the small messages if it's too busy handling the bigger ones? Update "The latter function calls sock_queue_rcv_skb() (in sock.h), which queues the UDP packet on the socket's receive buffer. If no more space is left on the buffer, the packet is discarded. Filtering also is performed by this function, which calls sk_filter() just like TCP did. Finally, data_ready() is called, and UDP packet reception is completed."

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• Create Custom Builds of an Xcode Project

  - by macinjosh

  I am going to build a Mac application written in Obj-C with Xcode. For argument's sake let's say it will have 10 optional features. I need a way to enable or disable those features to create custom builds of the application. These builds would be automated (most likely through the Mac OS X Terminal) so I would need a way to state which of these features are enabled/disabled at build time (a configuration file or CLI arguments would be ideal.) So what is the best way to accomplish this? I'm trying to plan this out before I start coding so that there is proper separation in my code base to allow for these features to come and go. Ideally the custom build would only contain compiled code for the features it should have. In other words I don't want to always compile all the features and condition them out at runtime.

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• Quickest and easiest way to implement speech to text conversion for a small speech subset.

  - by sgtpeppers

  Hi, I want to implement a system that receives speech through a microphone on my Mac OS x. I know arbitrary speech recognition is close to impossible without training the system so I'm willing to restrict it to 10 simple sentences. It must recognize with a high degree of accuracy which of these 10 sentences are being spoken, generate the text and add an entry to a remote MySQL database. With these being the architecture of the system I want to implement, could anyone give me an overview of what would be the best way to go about implementing this system? I'm looking for ideas like open source libraries to minimize the coding as this is just a prototype application for a demonstration. Basically I'm looking for a quick and easy solution. Thanks!

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• Upload file with POST method on Qt4

  - by mosg

  Hello! I'm looking for a basic code samples of how to upload files to server with HTTP POST method on Qt. My task: I have simple Qt program and I need to select any image file from the local host and upload it to the server. The selection part and GUI is simple and I have already done it, but with POST uploading I'm confused. In addition I have to say, that there is no authorization to upload file. If someone already looking this topic? PS: the reason why I'm asking and not coding my self is time, I need to get this method quick. Thank you, all success solutions from my side will be posted here for others.

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• Do you have any tips for comments code to keep them in step with the code?

  - by Rob Wells

  G'day, I've read both of Steve McConnell's excellent Code Complete books "Code Complete" and "Code Complete 2" and was wondering if people have any other suggestions for commenting code. My commenting mantra could be summed up by the basic idea of expressing "what the code below cannot say". While enjoying this interesting blog post by Jeff about commenting I was still left wondering "When coding, when do you feel a comment is required?" Edit: Oops. Seems to be a duplicate of this question http://stackoverflow.com/questions/121945/how-do-you-like-your-comments so sorry for the noise. Thanks to my, seemingly, SO shadow for pointing it out - wouldn't have thought I was that interesting. Now off to read the original post and see if it is relevant. Edit: I meant to emphasise the best appraoch to ensure that your comments will stay in step with the code. Maybe expressing an intent rather than the mechansim for instance.

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• How to "kill" background worker completely?

  - by Ken Hung

  Hi All, I am writing a windows application that runs a sequence of digital IO actions repeatedly. This sequence of actions starts when the user click a "START" button, and it is done by a background worker in backgroundWorker1_DoWork(). However, there are occasions when I get the "This backgroundworker is currently busy......." error message. I am thinking of implementing the following in the code, by using a while loop to "kill" the background worker before starting another sequence of action: if (backgroundWorker1.IsBusy == true) { backgroundWorker1.CancelAsync(); while (backgroundWorker1.IsBusy == true) { backgroundWorker1.CancelAsync(); } backgroundWorker1.Dispose(); } backgroundWorker1.RunWorkerAsync(); I think my main concern is, will the backgroundWorker1 be "killed" eventually? If it will, will it take a long time to complete it? Will this coding get me into an infinite loop?

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• Mixin or Trait implementation in AS3?

  - by Brian Heylin

  I'm looking for ideas on how to implement a Mixin/Trait style system in AS3. I want to be able to compose a number of classes together into a single object. Of course this is not a language level feature of AS3, but I'm hoping that there is maybe some way to do this using prototype based techniques or maybe some bytecode hacking that I believe AsMock uses to implement it's functionality. An existing Java example is Qi4J where the user define interfaces that the Qi4j framework implements based on metadata tags and coding by convention. Has anyone any ideas on how to get the Mixin/Trait concept working within AS3?

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• How can HTML5 "replace" Flash?

  - by Kassini

  A topic of debate that's seen a resurgence since the unveiling of the iPad is the issue of Flash versus HTML5. There are those that suggest that HTML5 will one day supplant/replace Adobe Flash. I do not develop software that runs in a browser, so my (limited) understanding is: HTML is a pure-text markup language that is delivered over HTTP to a client browser. The client browser interprets the markup and renders (with varying degrees of success) the page according to an standard specification. Adobe Flash is a propriety framework for working with audio, video, sound and raster/vector graphics. It requires special authoring tools (a compiler perhaps?) and a custom player that's available as a plug-in to most common browsers. Could someone please explain (to this C/C++ developer) how it is possible from a technical/coding point-of-view that a text-based markup language (HTML5) could be considered a replacement to a multimedia framework (Flash)? Please no opinionated arguments - just technical facts.

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• Splitting up/merging windows in WPF

  - by drasto

  I'm new to WPF but I need to implement following functionality: I have a window that contains one Grid (might be changed to stack panel or something else). In that Grid I have 2 columns, each of them contains another Grid. Lets call them gridFirst and gridSecond. There is also GridSplitter in first column allowing to resize the columns. I want to provide a button that will allow to separate gridFirst from this window and display it "as it is" in another window. How do I do that? It would be nice if the new window had a same menu as the original window without me having to copy-paste (that not a good coding practise) all its code to the new window. Thanks for answers

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• Twisted Python getPage

  - by David Dixon II

  I tried to get support on this but I am TOTALLY confused. Here's my code: from twisted.internet import reactor from twisted.web.client import getPage from twisted.web.error import Error from twisted.internet.defer import DeferredList from sys import argv class GrabPage: def __init__(self, page): self.page = page def start(self, *args): if args == (): # We apparently don't need authentication for this d1 = getPage(self.page) else: if len(args) == 2: # We have our login information d1 = getPage(self.page, headers={"Authorization": " ".join(args)}) else: raise Exception('Missing parameters') d1.addCallback(self.pageCallback) dl = DeferredList([d1]) d1.addErrback(self.errorHandler) dl.addCallback(self.listCallback) def errorHandler(self,result): # Bad thingy! pass def pageCallback(self, result): return result def listCallback(self, result): print result a = GrabPage('http://www.google.com') data = a.start() # Not the HTML I wish to get the HTML out which is given to pageCallback when start() is called. This has been a pita for me. Ty! And sorry for my sucky coding.

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• How to make a web browser with tabbed browsing with vb 2008?

  - by felixd68

  I've tried multiple times to create a web browser with tabbed browsing. I know that I have to use "tab control". I have succeeded in creating a semi-tabbed browsing. People are able to add new tabs, but the webbrowser component only appears in one tab page. Coding: Form1_Load: Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim Browse As New WebBrowser TabControl1.TabPages.Add(1, "TabPage" & i) TabControl1.SelectTab(1 - 1) Browse.Name = "wb" Browse.Dock = DockStyle.Fill TabControl1.SelectedTab.Controls.Add(Browse) i = i + 1 End Sub Web Browser Component Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) url.Text = e.Url.ToString() 'your url text box will show the actual url of the page after the page is fully loaded url.Text = e.Url.ToString Me.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle & " - Webbrowser's name" TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle End Sub

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• Hold i ajax call in every minute calling section

  - by gowri

  i am calling ajax every second in page.. Here the server page returns randomly generated number,using this number(converted into seconds) i am triggering another function in ajax success .it works My problem suppose random number = 5 means trigger() function called after 5 seconds using setTimeout,but rember ajax call is triggering every 1 second so trigger function also called many time. i want to make ajax call wait untill trigger function execution.Which means i wanna pause that ajax call untill 5 seconds after that resume How can i do this ? My coding //this ajax is called every minute $.ajax({ type: "POST", url: 'serverpage', data: ({pid:1}), success: function(msg) { var array = msg.split('/'); if(array[0]==1){ setTimeout(function() { trigger(msg); },array[1]+'000'); } } }); //and my trigger function function trigger(value) { alert("i am triggered !"); } server response maybe 1/2 or 1/5 or 1/ 10 or 1/1 here 1/3(this is converted into seconds)

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• ASP.NET MVC: Is it "wrong" to use HTTP 500 via an AJAX request to return invalid form content?

  - by Daniel Schaffer

  Here's the situation: I've got two partial views. One has a form. What needs to happen is when the form is posted via an AJAX request, if the operation succeeds, the area with the second partial is repopulated with the content. However, if the posted data was invalid, the original partial is repopulated with an error message. I'm using jQuery and the ajaxForm plugin to handle the form posts and responses. Would it be "wrong"/bad coding/wtf-worthy to conditionally use $.html() to replace the content in one area when it's a 200, and a different area if it's a 500? To me, this idea smells, but I'm not sure how else to accomplish the goal.

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• VIM: created syntax not showing up?

  - by joxnas

  HI people I recently changed to VIM for coding in C. I'd like to hightlight the operators +-<=& ... etc I searched in google how should i do it, and i found the answer in this website: I was suppose to do something like: syntax match Operadores /[][><()&!|+*={}-]/ hi Operadores guifg=#000000 gui=BOLD Those characters were supposed to appear as black, bold characters. However, that doesn't happen when I open my .C files. However, if I create a newfile, (where there the C syntax doesn't show up), I am able to see the black, bolded operators. How can i correct this situation, and why is this happening (it seams like if my syntax is beeing overwrided by the C syntax). I'm using gvim, and this is my vimrc: colorscheme nicotine set smartindent set number set guifont=Inconsolata\ Medium\ 11 set numberwidth=5 noremap j jzz noremap k kzz Thanks, any help is appreciated. (And dont forget I'm a novice in VIM, and ..sorry for my English)

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• stanza like application for iPad

  - by Suresh Varma

  Hi, I want to try to create an eReader for the Ipad like Stanza but I can't really find any open source project or help in the web, I don't really know how to begin and how to do it. If someone have idea, know how to create an eReader, display content page by page, how to use epub lib on Iphone (objective-c) Thanks in advance for any help.. Happy coding Edit: Since the question is too big the simple thing i want to know is how to let epub file run on my iPad. Or if you have any link or tutorial which teaches how to use epub file with iPad or iPhone would be a great help. Thanks

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• Inverse Logistic Function / Reverse Sigmoid Function

  - by Chanq

  I am currently coding up a fuzzy logic library in java. I have found the equations for all the standard functions - Grade, inverseGrade, Triangle, Trapezoid, Gaussian. However, I can't find the inverse of the sigmoid/ logistic function. The way I have written the logistic function is java is : //f(x) = 1/(1+e(-x)) public double logistic(double x){ return (1/(1+(Math.exp(-x))); } But I can't work out or find the inverse anywhere. My algebraic/calculus abilities are fairly limited, hence why I haven't been able to work out the inverse of the function. Any hints or pointers would be a big help. Thanks

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• How to avoid code duplication for one-off methods with a slightly different signature

  - by Sean

  I am wrapping a number of functions from a vender API in C#. Each of the wrapping functions will fit the pattern: public IEnumerator<IValues> GetAggregateValues(string pointID, DateTime startDate, DateTime endDate, TimeSpan period) { // Validate Data // Break up Requesting Time-Span // Make Requests // Read Results (through another method call } 5 of the 6 requests are aggregate data pulls and have the same signature, so it makes sense to put them in one method and pass the aggregate type to avoid duplication of code. The 6th method however follows the exact same pattern with the same result-set, but is not an aggregate, so no time period is passed to the function (changing the signature). Is there an elegant way to handle this kind of situation without coding a one-off function to handle the non-aggregate request?

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• How does Alpha Five Version 10 Rate for Web App Development

  - by Gary B2312321321

  I came across this RDMS via the advert on stackoverflow. Seems to be in the vein of MS Access / Filemaker / Apex database development tools but focused on web based applications. It quotes rave reviews from EWeek and a favourable mention from Dr Dobbs regarding its ability to create AJAX web applications without coding. The Eweek review, apparently written by an ASP.NET programmer, goes on to proclaim the ease at which apps can be extended using the inbuilt XBasic language and how custom javascript can easily be added without wading through code. Has anyone here built a web app with Alpha 5? Does anyone have comments on the development process, the speed of it or limitations they encountered along the way? To me it seems Oracle APEX comes closest to the feature set, has anyone programmed in both and have any comments?

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• How would you fool your boss, if you needed to? [closed]

  - by Starx

  Even as a programmer myself, I am not always in mood of coding, so I think of a way to fool my boss and GET GOING..... (if you know what I mean). Like one time I wanted to go home early, I said to my boss, "Sir, I have a check up, I need to meet my doctor at 12:00 pm today". And I was out of there Well, I am doing this, so I thought others might also have done something like this or wanted to do something like this. So, How about sharing them?

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• Onshore work methods V Offshore Supplier work methods - how to strike a balance?

  - by LadyCoconut

  Any advice on the best way to strike a balance between the work methods of an offshore supplier and the work methods of a new onshore team? We have an offshore supplier with about 2 years who have their own working practices and methods. I was bought in as the first onshore developer for my company with the view to vetting the code that comes in and putting together some best practices. Now from what I've seen there are lots of holes in their process (e.g. estimation, planning, code reviews, coding standards from about 10 years ago, no concept of mocking, refactoring etc). I need to be seen as a problem solver and not a problem creator but also I need to try and be somewhat forceful of what they are doing needs improving and at the end of the day they are a supplier. I would appreciate any advice. Thanks.

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