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• Why do many software projects fail today?

  - by TomTom

  As long as there are software projects, the world is wondering why they fail so often. I would like to know if there is a list or something equivalent which shows how many software projects fail today. Would be nice if there would be a comparison over the last 20 - 30 years. You can also add your top reason why a software project fails. Mine is "Requirements are poor or not even existing." which includes also "No (real) customer / user involved". EDIT: It is nearly impossible to clearly define the term "fail". Let's say that fail means: The project was more than 10% over budget and time. In my opinion the 10% + / - is a good range for an offer / tender. EDIT: Until now (Feb 11) it seems that most posters agree that a fail of the project is basically a failure of the project management (whatever fail means). But IMHO it comes out, that most developers are not happy with this situation. Perhaps because not the manager get penalized when a project was not successful, but the lazy, incompetent developer teams? When I read the posts I can also hear-out that there is a big "gap" between the developer side and the managment side. The expectations (perhaps also the requirements) seem to be so different, that a project cannot be successful in the end (over time / budget; users are not happy; not all first-prio features implemented; too many bugs because developers were forced to implement in too short timeframes ...) I',m asking myself: How can we improve it? Or do we have the possibility to improve it? Everybody seems to be unsatisfied with the way it goes now. Can we close the gap between these two worlds? Should we (the developers) go on strike and fight for "high quality reqiurements" and "realistic / iteration based time shedules"? EDIT: Ralph Westphal and Stefan Lieser have founded a new "community" called: Clean-Code-Developer. The aim of the group is to bring more professionalism into software engineering. Independently if a developer has a degree or tons of years of experience you can be part of this movement. Clean Code Developers live principles like SOLID every day. A professional developer is the biggest reviewer of his own work. And he has an internal value system which helps him to improve and become better. Check it out on: Clean Code Developer EDIT: Our company is doing at the moment a thing called "Application Development and Maintenance Benchmarking". This is a service offered by IBM to get a feedback from someone external on your software engineering process quality etc. When we get the results, I will tell you more about it.

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• How to send messages between c++ .dll and C# app using named pipe?

  - by Gal

  I'm making an injected .dll written in C++, and I want to communicate with a C# app using named pipes. Now, I am using the built in System.IO.Pipe .net classes in the C# app, and I'm using the regular functions in C++. I don't have much experience in C++ (Read: This is my first C++ code..), tho I'm experienced in C#. It seems that the connection with the server and the client is working, the only problem is the messaged aren't being send. I tried making the .dll the server, the C# app the server, making the pipe direction InOut (duplex) but none seems to work. When I tried to make the .dll the server, which sends messages to the C# app, the code I used was like this: DWORD ServerCreate() // function to create the server and wait till it successfully creates it to return. { hPipe = CreateNamedPipe(pipename,//The unique pipe name. This string must have the following form: \\.\pipe\pipename PIPE_ACCESS_DUPLEX, PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_NOWAIT, //write and read and return right away PIPE_UNLIMITED_INSTANCES,//The maximum number of instances that can be created for this pipe 4096 , // output time-out 4096 , // input time-out 0,//client time-out NULL); if(hPipe== INVALID_HANDLE_VALUE) { return 1;//failed } else return 0;//success } void SendMsg(string msg) { DWORD cbWritten; WriteFile(hPipe,msg.c_str(), msg.length()+1, &cbWritten,NULL); } void ProccesingPipeInstance() { while(ServerCreate() == 1)//if failed { Sleep(1000); } //if created success, wait to connect ConnectNamedPipe(hPipe, NULL); for(;;) { SendMsg("HI!"); if( ConnectNamedPipe(hPipe, NULL)==0) if(GetLastError()==ERROR_NO_DATA) { DebugPrintA("previous closed,ERROR_NO_DATA"); DisconnectNamedPipe(hPipe); ConnectNamedPipe(hPipe, NULL); } Sleep(1000); } And the C# cliend like this: static void Main(string[] args) { Console.WriteLine("Hello!"); using (var pipe = new NamedPipeClientStream(".", "HyprPipe", PipeDirection.In)) { Console.WriteLine("Created Client!"); Console.Write("Connecting to pipe server in the .dll ..."); pipe.Connect(); Console.WriteLine("DONE!"); using (var pr = new StreamReader(pipe)) { string t; while ((t = pr.ReadLine()) != null) { Console.WriteLine("Message: {0}",t); } } } } I see that the C# client connected to the .dll, but it won't receive any message.. I tried doing it the other way around, as I said before, and trying to make the C# send messages to the .dll, which would show them in a message box. The .dll was injected and connected to the C# server, but when It received a message it just crashed the application it was injected to. Please help me, or guide me on how to use named pipes between C++ and C# app

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• Stack data storage order

  - by Jamie Dixon

  When talking about a stack in either computing or "real" life we usually assume a "first on, last off" type of functionality. Because the idea of a stack is based around something in the physical world, does it matter how the data in the stack is stored? I notice in a lot of examples that the storage of the stack data is quite often done using an array and the newest item added to the stack is placed at the bottom of the array. (like adding a new plate to an existing stack of plates except putting it underneath the other plates rather than on top). As a paradigm, does it matter in what order the data is stored within the stack as long as the operation of the stack acts as expected?

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• jquery countdown/countUP with server side values

  - by basit.

  script: http://keith-wood.name/countdown.htm daily json response: items: { fajr: '5:23 am', sharooq: '7:23 am', dhur: '1:34 pm', asr: '4:66 pm': magrib: '6:23 pm', isha: '8:01 pm'} when site loads i make ajax request and get the above response times, these are events that happens daily for everyday, but different timing. i want to get that time and put a count down on how many minitues left or hours or seconds and show that and once the seconds are done, then show how many minitues ago that event took place, after 15 minitues later show new even count down. so following on how it will look on display dhur 2 hours left dhur 2 minutes left (if no longer hours left) dhur 55 seconds left (if no longer minutes left) dhur 5 seconds ago (if count down finished and then show how many seconds ago) dhur 9 minutes ago (if extended more then seconds, then show how many minutes ago) asr 1 hour left (after 15 minutes later time changes to new event) this is kind of very simple for pro in javascript and really complicated for me, so need your guys help, if the script im using not good and you prefer some other script for this kind of task, please share with me, it dont have to be jquery script, but helps if its jquery.

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• multiple key ranges as parameters to a couchdb view

  - by kolosy

  is there a way to send multiple startKey/endKey pairs to a view, akin to the keys: [] array that can be posted for keys? the underlying problem - let's say my documents have "categories" and timestamps. if i want all documents in the "foo" category that have a timestamp that's within the last two hours, it's simple: function (doc) { emit([doc.category, doc.timestamp], null); } and then query as GET server:5894/.../myview?startKey=[foo, |now - 2 hours|]&endkey=[foo, |now|] the problem comes when i want something in categories foo or bar, within the last two hours. if i didn't care about time, i could just pull directly by key through the keys collection. unfortunately, i have no such option with ranges. what i ended up doing in the meantime is rounding the timestamp to two-hour blocks, and then multiplexing the query out: POST server:5894/.../myview keys=[[foo, 0 hours], [foo, 2 hours], [bar, 0 hours], [bar, 2 hours]] it works, but will get messy if i want to go back a large amount of time (in relationship to the blocksize)

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• How do I prevent flickering on CListCtrl?

  - by Sorin Sbarnea

  I'm using a CListCtrl/CListView report view (LVS_REPORT) in virtual mode (LVS_OWNERDATA) with LVS_EX_DOUBLEBUFFER enabled and I encounter ugly flickering. Double buffer have a real effect but it doesn't stop all flickering (without it very slow). I'm not looking for switching to other controls that would require a high amount of rework (like ObjectListView) How does the flickering behaves: * on column resize - the background is first clean using lightgray and after this is displayed the text (background is white) * on mouse scroll (animated) - for a very short time there is lightgray-bar displayed in the area where new lines are to be displayed. It looks like it does clean the background using the default window background color (lightgray) for the area where it has to redraw. How do I solve the flickering problem?

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• Please explain some of Paul Graham's points on LISP

  - by kunjaan

  I need some help understanding some of the points from Paul Graham's article http://www.paulgraham.com/diff.html A new concept of variables. In Lisp, all variables are effectively pointers. Values are what have types, not variables, and assigning or binding variables means copying pointers, not what they point to. A symbol type. Symbols differ from strings in that you can test equality by comparing a pointer. A notation for code using trees of symbols. The whole language always available. There is no real distinction between read-time, compile-time, and runtime. You can compile or run code while reading, read or run code while compiling, and read or compile code at runtime. What do these points mean How are they different in languages like C or Java? Do any other languages other than LISP family languages have any of these constructs now?

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• Silverlight XML editor / syntax highlighting

  - by Gromix

  Hi, I am looking for a Silverlight text editor control that provides XML syntax highlighting. I found a few answers in Winforms or WPF, like here on Stackoverflow, but I didn't manage to convert them to Silverlight. The fact that Silverlight is missing System.Drawing is probably a big problem. The only text editor I found for Silverlight is RichTextEdit on Codeplex, but I don't think it is a suitable base for real-time syntax highlighting. Has anyone heard of such a control, or can provide hints on how to build one? Many thanks, Romain

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• Slow Update/insert into SQL Server CE using LinqToDatasets

  - by Vaccano

  I have a mobile app that is using LinqToDatasets to update/insert into a SQL Server CE 3.5 File. My Code looks like this: // All the MyClass Updates MyTableAdapter myTableAdapter = new MyTableAdapter(); foreach (MyClassToInsert myClass in updates.MyClassChanges) { // Update the row if it is already there int result = myTableAdapter.Update(myClass.FirstColumn, myClass.SecondColumn, myClass.FirstColumn); // If the row was not there then insert it. if (result == 0) { myTableAdapter.Insert(myClass.FirstColumn, myClass.SecondColumn); } } This code is used to keep the hand held database in sync with the server database. Problem is if it is a full update (first time for example) there are a lot of updates (about 125). That makes this code (and more loops like it take a very long time (I have three such loops that take over 30 seconds each). Is there a faster or better way to do updates/inserts like this? (I did see this Codeplex Project, but I could not see how to make it work with both updates and inserts.)

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• Enhance Localization performances? (ComponentResourceManager.ApplyResources)

  - by Srodriguez

  Dear all, After experiencing some performances issues on my client side, we decided to give a try to some of the performance profilers to try to find the bottleneck or identify the guilty parts of the code. Of course, as many performance investigations, the problems comes from various things, but something I find out is that the ComponentResourceManager.ApplyResources of my user controls takes way too much time in the construction of my forms: more than 24% of the construction time is spent in the ApplyResources inside the InitializeComponent(). This seems rather a lot for only "finding a resource string and putting it in it's container". What is exactly done in the ComponentResourceManager.ApplyResources ? I guess more than searching the string, if not it wouldn't take that long. Is there a way to enhance the performances of the localization? Our software is localized in several languages, so we do need to keep this multi-lingual feature. Any recommendations regarding this issue? Thanks! PS: We are coding in C#, .NET 3.5 SP1.

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• Units of measurement conversion logic in C#

  - by EvanRyan

  I am adding a feature to my program in which the user will have the ability to change their unit of measurement at any time, and have the program recalculate their input and output. If the user inputs say, 20lbs for an item, then decides he wants to work in kilograms instead, he can select an option to do so at any time, and the program will recalculate his 20lb input to 9Kg. Then if he decides he'd rather work in ounces, it would convert that 9Kg to 320oz, so on and so forth. What would be the most effective and efficient way to go about this? I've been racking my brain trying to figure out a way to have the correct formula be implemented.

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• Read half precision float (float16 IEEE 754r) binary data in matlab

  - by Michael

  you have been a great help last time, i hope you can give me some advise this time, too. I read a binary file into matlab with bit16 (format = bitn) and i get a string of ones and zeros. bin = '1 00011 1111111111' (16 bits: 1. sign, 2-6. exponent, 7-16. mantissa) According to ftp://www.fox-toolkit.org/pub/fasthalffloatconversion.pdf it can be 'converted' like out = (-1)^bin(1) * 2^(bin(2:6)-15) * 1.bin(7:16) [are exponent and mantissa still binary?] Can someone help me out and tell me how to deal with the 'eeeee' and '1.mmmmmmmmmm' as mentioned in the pdf, please. Thanks a lot! Michael

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• Django-Registration & Django-Profile, using your own custom form

  - by Issy

  Hey All, I am making use of django-registration and django-profile to handle registration and profiles. I would like to create a profile for the user at the time of registration. I have created a custom registration form, and added that to the urls.py using the tutorial on: http://dewful.com/?p=70 The basic idea in the tutorial is to override the default registration form to create the profile at the same time. forms.py - In my profiles app from django import forms from registration.forms import RegistrationForm from django.utils.translation import ugettext_lazy as _ from profiles.models import UserProfile from registration.models import RegistrationProfile attrs_dict = { 'class': 'required' } class UserRegistrationForm(RegistrationForm): city = forms.CharField(widget=forms.TextInput(attrs=attrs_dict)) def save(self, profile_callback=None): new_user = RegistrationProfile.objects.create_inactive_user(username=self.cleaned_data['username'], password=self.cleaned_data['password1'], email=self.cleaned_data['email']) new_profile = UserProfile(user=new_user, city=self.cleaned_data['city']) new_profile.save() return new_user In urls.py from profiles.forms import UserRegistrationForm and url(r'^register/$', register, {'backend': 'registration.backends.default.DefaultBackend', 'form_class' : UserRegistrationForm}, name='registration_register'), The form is displayed, and i can enter in City, however it does not save or create the entry in the DB.

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• Android: bug in launchMode="singleTask"? -> activity stack not preserved

  - by Stefan Klumpp

  My main activity A has as set android:launchMode="singleTask" in the manifest. Now, whenever I start another activity from there, e.g. B and press the HOME BUTTON on the phone to return to the home screen and then again go back to my app, either via pressing the app's button or pressing the HOME BUTTONlong to show my most recent apps it doesn't preserve my activity stack and returns straight to A instead of the expected activity B. Here the two behaviors: Expected: A > B > HOME > B Actual: A > B > HOME > A (bad!) Is there a setting I'm missing or is this a bug? If the latter, is there a workaround for this until the bug is fixed? FYI: This question has already been discussed here. However, it doesn't seem that there is any real solution to this, yet.

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• AnkhSVN client side pre-commit hook

  - by santa

  Basically I want to do the same thing as the fella over there. It seems that everybody was thinking about server-side hooks (with all their evil potential). I want a client side script be run before commit so astyle can format the code the way my boss likes to see it. Since my IDE (VS2010Pro) automatically checks when a file changed on the disk an opts me in for reloading it, there is no real evil with all that. Is there any (clean) way to accomplish that with AnkhSVN? Maybe there's also a way to extend VisualStudio to call my pre-commit-script...

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• When querying the Win32_NTLogEvent Class from WMI with WQL is the TimeGenerated property based on Lo

  - by jpmcclung

  I am writing a C# windows service that is doing some churning through the eventlog on a few domain controllers. Some of them are Windows Server 2003 and some are Windows Server 2008. Upon the service stopping I am attempting to resume where I left off in the logs. In order to do this instead of SELECT * FROM Win32_NTLogEvent WHERE --criteria for events I am looking for I am doing SELECT * FROM Win32_NTLogEvent WHERE TimeGenerated = --some date AND --criteria for events I am looking for At one point I was convinced that the TimeGenerated field was in the local time of the server but now it seems that the Windows 2008 Servers are using GMT to record that time. Can anyone shed some light on if this is a real different between the way the two operating systems function or is this a configuration problem?

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• Asynchronous COMET query with Tornado and Prototype

  - by grundic

  Hello everyone. I'm trying to write simple web application using Tornado and JS Prototype library. So, the client can execute long running job on server. I wish, that this job runs Asynchronously - so that others clients could view page and do some stuff there. Here what i've got: #!/usr/bin/env/ pytthon import tornado.httpserver import tornado.ioloop import tornado.options import tornado.web from tornado.options import define, options import os import string from time import sleep from datetime import datetime define("port", default=8888, help="run on the given port", type=int) class MainHandler(tornado.web.RequestHandler): def get(self): self.render("templates/index.html", title="::Log watcher::", c_time=datetime.now()) class LongHandler(tornado.web.RequestHandler): @tornado.web.asynchronous def get(self): self.wait_for_smth(callback=self.async_callback(self.on_finish)) print("Exiting from async.") return def wait_for_smth(self, callback): t=0 while (t < 10): print "Sleeping 2 second, t={0}".format(t) sleep(2) t += 1 callback() def on_finish(self): print ("inside finish") self.write("Long running job complete") self.finish() def main(): tornado.options.parse_command_line() settings = { "static_path": os.path.join(os.path.dirname(__file__), "static"), } application = tornado.web.Application([ (r"/", MainHandler), (r"/longPolling", LongHandler) ], **settings ) http_server = tornado.httpserver.HTTPServer(application) http_server.listen(options.port) tornado.ioloop.IOLoop.instance().start() if __name__ == "__main__": main() This is server part. It has main view (shows little greeting, current server time and url for ajax query, that executes long running job. If you press a button, a long running job executes. And server hangs :( I can't view no pages, while this job is running. Here is template page: <html> <head> <title>{{ title }}</title> <script type="text/javascript" language="JavaScript" src="{{ static_url("js/prototype.js")}}"></script> <script type='text/javascript' language='JavaScript'> offset=0 last_read=0 function test(){ new Ajax.Request("http://172.22.22.22:8888/longPolling", { method:"get", asynchronous:true, onSuccess: function (transport){ alert(transport.responseText); } }) } </script> </head> <body> Current time is {{c_time}} <br> <input type="button" value="Test" onclick="test();"/> </body> </html> what am I doing wrong? How can implement long pooling, using Tornado and Prototype (or jQuery) PS: I have looked at Chat example, but it too complicated. Can't understand how it works :( PSS Download full example

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• SAT Thread and Process output capture in c#

  - by alex

  Hi: This is a strange problem I encountered. I have an window application written in c# to do testing. It has a MDI parent form that is hosting a few children forms. One of the forms launch test cripts by creating processes and capture the scripts output to a text box. Another form open serial port and monitoring the status of the device I am working on(like a shell). If I ran both of them together, the output of the script seems only appear in the text box after the test is done. However, If I don't open the serial port form, the output of the script is captured in real time. Does anyone knows what's causing the problem? I notice the onDataReceived even handler for serial port form has a [SAThread] header to it. Will this cause the serial port thread having higher priority than other processes? Thanks in advance.

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• Error reading in date using Zoo in R

  - by SASnewby

  I am trying to use the Zoo package to read in daily observations which do not occur on each day. The date format looks like this, and it is in the first column of dataset: 25-May-07 The command I use is: z <- read.zoo("multiplier7.csv", sep = ";", header = TRUE, format="%d-%b-%y") I get this error: Error in strptime(x, format, tz = "GMT") : input string is too long First question is: 1. Is Zoo the right package to use if I want to use lm regression with a spline time dummy? The bs command does not work because I need to convert it into a time series. 2. Why is this error occurring and how to fix?

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• Determing software estimates and tracking past estimates

  - by Casey

  I know that this probably has as many answers as users here on SO, but software estimation always seemed like an esoteric science. Software developers don't have a magic book to refer to as exist in many other industries. I've been spending the last couple of days working on putting together some estimates for a bit of work that I am proposing for a freelance project that I am working on and am having trouble getting it down. I'm not experienced with any real software estimation practices and am trying to go from the gut based on my experience but also trying to be a little loose (not too loose though) on the estimates to leave me a bit of room to work. I read this blog entry http://blogs.popart.com/2007/07/what-scotty-from-star-trek-can-teach-us-about-managing-expectations/ that was linked to from SO and would like to start tracking my estimates at work as well even though I'm not really required to create estimates there. What tools or techniques would you recommend? Also, how much padding do you usually add in to a time estimate?

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• Should static analysis warnings fail the CI build?

  - by Cara

  Our team is investigating various options for static analysis in our project, and have mixed opinions about whether we want our Continuous Integration build to fail because of warnings from static analysis. The argument against failing the build is that there are often exceptions to the rules, and attempting to work around them just to make the build succeed reduces productivity. A better approach would be to generate reports with the build, and regularly dedicate developer time to addressing the reported issues. The counter-argument is that it is easy for the technical debt to build up if the bugs are not addressed immediately. Also, if the build fails when a potential bug is introduced, the amount of time required to fix it is reduced. What are your thoughts?

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• How to run benchmarking on MySQL?

  - by HexaHow

  My server has installed MySQL Server 5.1. I would like to run benchmarking on the MySQL, but I couldn't found sql-bench, which is Benchmark Suite provided by MySQL. The MySQL Benchmark Suite seem like complicated to be install or setup into my server. I need one can be direct setup to test the benchmark without using Perl script liked the benchmark suite from MySQL. Do anyone knows how to get the most popular benchmarking tool to measure MySQL performance? I need to measure the performance of my SQL written in ASP.Net that connecting to MySQL. I need to optimize the SQL script. It's better has a benchmarking tool where can be read my SQL in many times and return me the query result's time for comparison, etc. I just need to know the time consuming and performance for the each SQL runs in many times.

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• File io error Python

  - by serpiente

  I have a program that monitors a folder with word documents for any modifications made on the files. The error -Windows Error[2] The system cannot find the file specified- comes when I run the program, open a .doc within the folder make some changes and save it. Any suggestions on how to fix this? Here's the code: def archivar(): txt = open('archivo.txt', 'r+' ) for rootdir, dirs, files in os.walk(r"C:\Users\keinsfield\Desktop\colegio"): for file in files: time = os.stat(os.path.join(rootdir, file)).st_ctime txt.write(file +','+str(time) + '\n') def check(): txt = [col.split(',') for col in (open('archivo.txt', 'r+').read().split('\n'))] files = os.listdir(r"C:\Users\keinsfield\Desktop\colegio") for file in files: for info in txt: if info[0]==os.stat(os.path.join(r"C:\Users\keinsfield\Desktop\colegio",file)).st_ctime: print "modified"

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• How to best develop web crawlers

  - by Fernando Barrocal

  Heyall, I am used to create some crawlers to compile information and as I come to a website I need the info I start a new crawler specific for that site, using shell scripts most of the time and sometime PHP. The way I do is with a simple for to iterate for the page list, a wget do download it and sed, tr, awk or other utilities to clean the page and grab the specific info I need. All the process takes some time depending on the site and more to download all pages. And I often steps into an AJAX site that complicates everything I was wondering if there is better ways to do that, faster ways or even some applications or languages to help such work.

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• Fortran arrays and subroutines

  - by ccook

  I'm going through a Fortran code, and one bit has me a little puzzled. There is a subroutine, say SUBROUTINE SSUB(X,...) REAL*8 X(0:N1,1:N2,0:N3-1),... ... RETURN END Which is called in another subroutine by: CALL SSUB(W(0,1,0,1),...) where W is a 'working array'. It appears that a specific value from W is passed to the X, however, X is dimensioned as an array. What's going on?

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