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• OpenCV 2.0 C++ API using imshow: returns unhandled exception and "bad-flag"

  - by Konrad

  I'm trying to use the new OpenCV 2.0 API in MS Visual C++ 2008 and wrote this simple program: cv::Mat img1 = cv::imread("image.jpg",1); cv::namedWindow("My Window", CV_WINDOW_AUTOSIZE); cv::imshow("My Window", img1); Visual Studio returnes an unhandled exception and the Console returns: OpenCV Error: bad flag (parameter or structure field) (Unrecognized or unsupported array type) in unknown function, file ..\..\..\..\ocv\opencv\src\cxcore\cxarray.cpp, line 2376 The image is not displayed. Furthermore the window "My Window" has a strange caption: "ÌÌÌÌMy Window", which is not dependent on the name. The "old" C API using commands like cvLoadImage, cvNamedWindow or cvShowImage works without any problem for the same image file. I tried a lot of different stuff without success. I appreciate any help here. Konrad

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• [hibernate - jpa ] good practices and bad practices

  - by blow

  Hi all, i have some questions about interaction with hibernate. openSession or getCurrentSession (without jta, thread insted)? How mix session operations with swing gui? Is good have something like this in a javabean class? public void actionPerformed(ActionEvent event) { // session code } Can i add methods to my entities that contains hql queries or is a bad practice? For example: // This method is in an entity MyOtherEntity.java class public int getDuration(){ Session session=HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); int sum=(Integer)session.createQuery("select sum(e.duration) as duration from MyEntity as e where e.myOtherEntity.id=:id group by e.name"). .setLong("id", getId()); .uniqueResult(); return sum; } In alternative how can i do this in a better and elegant way? Thanks.

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• Properties of bad fibonacci algorithm

  - by John Smith

  I was looking at the canonical bad fibonacci algorithm the other day: public static int fib(int n) { // Base Case if (n < 2) return 1; else return fib(n-1) + fib(n-2); } I made the interesting observation. When you call fib(n), then for k between 1 and n fib(k) is called precisely fib(n-k+1) times (or fib(n-k) depending on your definition of fib(0) ). Also, fib(0) is called fib(n-k-1) times. This then allows me to find that in fib(100) there are exactly 708449696358523830149 calls to the fib function. Are there other interesting observations on this function you know of?

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• Bad Access while reading ABAddressBookCopyArrayOfAllPeople

  - by Mohammed Sadiq

  HI all, When I tried to read the record of all peoples from the device as follows: NSArray* allPersons = (NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook); I am getting a bad access. When I tried the same code in the simulator its working . Stack trace as follows: #0 0x322aafa8 in sqlite3_backup_init #1 0x322cb248 in sqlite3_prepare16 #2 0x32287948 in sqlite3_step #3 0x32e3289c in CPSqliteStatementSendResults #4 0x32e34cf4 in CPRecordStoreProcessStatementWithPropertyIndices #5 0x32e34d26 in CPRecordStoreProcessStatement #6 0x32e36008 in CPRecordStoreProcessQuery #7 0x32e36064 in CPRecordStoreCopyAllInstancesOfClassWhere #8 0x32e3608a in CPRecordStoreCopyAllInstancesOfClass #9 0x33e61f30 in ABCCopyArrayOfAllPeopleInStoreWithSortOrdering #10 0x33e62020 in ABCCopyArrayOfAllPeople #11 0x33e6c184 in ABAddressBookCopyArrayOfAllPeople #12 0x00028308 in -[ContactStore start] at ContactStore.m:192 #13 0x000175e8 in -[StoreManager getState] at StoreManager.m:213 #14 0x00016f40 in -[StoreManager enumerate:] at StoreManager.m:91 #15 0x0001fe7a in -[BackupTask handle] at BackupTask.m:249 #16 0x000238c4 in -[TaskExecuter handleTask:] at TaskExecutor.m:168 #17 0x00023ef2 in -[TaskExecuter run] at TaskExecutor.m:229 #18 0x33f7cacc in -[NSThread main] #19 0x33f2ad14 in __NSThread__main__ #20 0x327587b8 in _pthread_body Any help wil be greatly appreciated ... Best Regards, Mohammed sadiq

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• How to Encourage More Frequent Commits to SVN

  - by Yaakov Ellis

  A group of developers that I am working with switched from VSS to SVN about half a year ago. The transition from CheckOut-CheckIn to Update-Commit has been hard on a number of users. Now that they are no longer forced to check in their files when they are done (or more accurately, now that no one else can see that they have the file checked out and tell them to check back in in order to release the lock on the file), it has happened on more than one occasion that users have forgotten to Commit their changes until long after they were completed. Although most users are good about Committing their changes, the issue is serious enough that the decision might be made to force users to get locks on all files in SVN before editing. I would rather not see this happen, but I am at a loss over how to improve the situation in another way. So can anyone suggest ways to do any of the following: Track what files users have edited but have not yet Committed changes for Encourage users to be more consistent with Committing changes when they are done Help finish off the user education necessary to get people used to the new version control paradigm Out-of-the-box solutions welcome (ie: desktop program that reminds users to commit if they have not done so in a given interval, automatically get stats of user Commit rates and send warning emails if frequency drops below a certain threshold, etc).

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• How to increment variable names/Is this a bad idea

  - by tom

  In Python, if I were to have a user input the number X, and then the program enters a for loop in which the user inputs X values, is there a way/is it a bad idea to have variable names automatically increment? ie: user inputs '6' value_1 = ... value_2 = ... value_3 = ... value_4 = ... value_5 = ... value_6 = ... Can I make variable names increment like that so that I can have the number of variables that the user inputs? Or should I be using a completely different method such as appending all the new values onto a list?

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• Cygwin command not found bad characters found in .bashrc 357\273\277

  - by mytwocents

  Hello, I'm new to Cygwin, I just installed it and attempted to set some simple environment variables. However, when I open the command shell, I get the error "#357\273\277 command not found" I found an article that discusses what the problem is and how to "discover" the hidden bad character: http://mblog.lib.umich.edu/DataDiscussions/archives/2010/01/index.html but I don't know how to resolve the issue by removing the character (which I validated was a problem in my .bashrc file using the od command). I attempted to change the preferences view in Notepad++ to UTF-8 and ANSI to no avail, but the file was not altered at all. Any help would be appreciated...

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• CMS Preventing Bad HTML Insertion by Client?

  - by Jascha

  I'm building a small CMS in PHP for a client and something I've noticed that comes up fairly often is a client will enter a bit of HTML in a field without closing his/her tag. I'm wondering if there is some parsing technique to prevent bad HTML from rendering my whole output page in italics because the user forgot to add a closing </i> tag. I'm not worried about XSS or malicious html, just a forgotten tag here and there as it's the client who is managing the content. Forgive me if this is a duplicate question, I did some searching, but could not find an appropriate answer. -J

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• What is so bad about using SQL INNER JOIN

  - by Stephen B. Burris Jr.

  Everytime a database diagram gets looked out, one area people are critical of is inner joins. They look at them hard and has questions to see if an inner join really needs to be there. Simple Library Example: A many-to-many relationship is normally defined in SQL with three tables: Book, Category, BookCategory. In this situation, Category is a table that contains two columns: ID, CategoryName. In this situation, I have gotten questions about the Category table, is it need? Can it be used as a lookup table, and in the BookCategory table store the CategoryName instead of the CategoryID to stop from having to do an additional INNER JOIN. (For this question, we are going to ignore the changing, deleting of any CategoryNames) The question is, what is so bad about inner joins? At what point is doing them a negative thing (general guidelines like # of transactions, # of records, # of joins in a statement, etc)?

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• How to find the right balance between "quick & dirty" and "nice & general" code?

  - by Frank

  This is not a direct programming question, but a little help from the programming community would be appreciated. I am suffering from an overgeneralization disease. I can't stop spending valuable time with making my code most general and abstract. I could also call it the toolkit/library disease. I tend to turn every programming task into a general problem and try to "write a toolkit", that would work for many similar problems. I know it's a good thing in general, if there is enough time, but sometimes I should be writing a quick prototype and just can't seem to write the quick and dirty code that just works for the special case. I often get excited about an idea that makes the code more general and user-configurable and understimate the time it takes to actually implement it that way. Does anyone else have this experience? How can I force myself to find the right balance between "quick hack" and "nice solution"?

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• Bad Practice requiring file within a model?

  - by Lee Marshall

  I have built an MVC php application and was wondering, if instead of having to write out a large amount of html and set the data, could I not just have all this html (with some php) in a separate file and just require it? For example: $test = '<div> Test content <div>More content</div> </div>'; $APP->Template->setData('test', $test, FALSE); Instead could I not just use: $test = require("includes/content.php"); $APP->Template->setData('test', $test, FALSE); Would this be considered as bad practise? It just seems that by requiring files, it can shorten the length of controllers. Would be good to get anybodies advice on this matter.

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• Bad File descriptor

  - by Luke

  Does anyone see a problem with this, its not working saying bad file descriptor not sure why? pipe(pipefd[0]); if ((opid = fork()) == 0) { dup2(pipefd[0][1],1);/*send to output*/ close(pipefd[0][0]); close(pipefd[0][1]); execlp("ls","ls","-al",NULL); } if((cpid = fork())==0){ dup2(pipefd[0][1],0);/*read from input*/ close(pipefd[0][0]); close(pipefd[1][1]); execlp("grep","grep",".bak",NULL); } close(pipefd[0][0]); close(pipefd[0][1]);

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• Bad http connection (400) from Simple Native Iphone App to test .net Web Service

  - by leo

  Dear all, I have written a simple hello world .net web service which will accept 2 parameters and return the parameters as a string. The web service is hosted by IIS on a windows xp pc. I am able to access the web service using safari on the iphone simulator, successfully tested the operation using HTTP POST by clicking the "invoke" button. However, when I use the native app on the iphone simulator, I keep getting a bad http connection error 400 on the IIS log. I have tested my native app with http://viium.com/WebService/HelloWorld.asmx and it works. I have already added Does anyone know what is wrong? Is it some settings that have not configured correctly? Thank you very much in advance.

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• what does programmer do while waiting the end of Compile

  - by sunglim

  Waiting for the end of compile is extreamly boring. So I used to do Stackoverflow and so on.. What do you usually do ? and sorry about my poor English

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• Facebook publish HTTP Error 400 : bad request

  - by Abhishek

  Hey I am trying to publish a score to Facebook through python's urllib2 library. import urllib2,urllib url = "https://graph.facebook.com/USER_ID/scores" data = {} data['score']=SCORE data['access_token']='APP_ACCESS_TOKEN' data_encode = urllib.urlencode(data) request = urllib2.Request(url, data_encode) response = urllib2.urlopen(request) responseAsString = response.read() I am getting this error: response = urllib2.urlopen(request) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 124, in urlopen return _opener.open(url, data, timeout) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 389, in open response = meth(req, response) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 502, in http_response 'http', request, response, code, msg, hdrs) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 427, in error return self._call_chain(*args) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 361, in _call_chain result = func(*args) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/urllib2.py", line 510, in http_error_default raise HTTPError(req.get_full_url(), code, msg, hdrs, fp) urllib2.HTTPError: HTTP Error 400: Bad Request Not sure if this is relating to Facebook's Open Graph or improper urllib2 API use.

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• bad request error 400 while using python requests.post function

  - by Toussah

  I'm trying to make a simple post request via the requests library of Python and I get a bad request error (400) while my url is supposedly correct since I can use it to perform a get. I'm very new in REST requests, I read many tutorials and documentation but I guess there are still things I don't get so my error could be basic. Maybe a lack of understanding on the type of url I'm supposed to send via POST. Here my code : import requests v_username = "username" v_password = "password" v_headers = {'content-type':'application/rdf+xml'} url = 'https://my.url' params = {'param': 'val_param'} payload = {'data': 'my_data'} r = requests.post(url, params = params, auth=(v_username, v_password), data=payload, headers=v_headers, verify=False) print r I used the example of the requests documentation.

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• How do you keep track of your thought process ?

  - by Johnny Blaze

  I find it very hard to answer question like : "why did you implemented it this way?" or "what's the reason of using that instead of that?" usually because the implementation is the result of a long thought process and trials and errors. By the time i'm finished i can't recall every specific details. I wanted to know if you have some tips to keep track of your thought process and answer those question easily.

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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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• Detecting bad jpeg images

  - by Gerard Cerchio

  The question on validating jpegs on network transfer is very helpful. Could we take this question one step further? What if the image data is incomplete or corrupt from the server? The complete transport works, the MIME type is image/jpeg, the UIImage is constructed and non-nil but the renderer discovers inconsistencies in the data and the log shows "Bad Huffman code" or "premature end of data segment" How would I capture this error before tossing the UIImage into the view context and thereby getting a not-pretty image on the screen? Could I render it to a non-screen context and capture the error?

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• Enclosing service execution in try-catch: bad practice?

  - by Sorin Comanescu

  Hi, Below is the usual Program.cs content for a windows service program: static class Program { /// <summary> /// The main entry point for the application. /// </summary> static void Main() { ServiceBase[] ServicesToRun; ServicesToRun = new ServiceBase[] { new MyService() }; ServiceBase.Run(ServicesToRun); } } Is it a bad practice to enclose the ServiceBase.Run(...) in a try-catch block? Thanks.

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• ./configure : /bin/sh^M : bad interpreter

  - by Vineeth

  Hello there, I've been trying to install lpng142 on my fed 12 system. Seems like a problem to me. I get this error [root@localhost lpng142]# ./configure bash: ./configure: /bin/sh^M: bad interpreter: No such file or directory [root@localhost lpng142]# How do I fix this? and for more details, I shall include the /etc/fstub file details here # # /etc/fstab # Created by anaconda on Wed May 26 18:12:05 2010 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/VolGroup-lv_root / ext4 defaults 1 1 UUID=ce67cf79-22c3-45d4-8374-bd0075617cc8 /boot ext4 defaults 1 2 /dev/mapper/VolGroup-lv_swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 [root@localhost etc]# Help, please

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• What do you do when you've just solved a really tough problem?

  - by bobobobo

  Once I've solved a really tough bug or problem that got me stuck for an hour or so, I usually get up, get a snack, and loiter for about 20 minutes. This probably isn't an effective work practice, but its what I tend to do. What do you do?

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• Replicating MySQL DB to development machine - bad idea?

  - by Joel

  I am considering replicating a production MySQL database to my development machine so I've always got current data. The production database is externally hosted. My development machine is behind an unreliable internet connection. It is entirely possible that the development machine could be disconnected from the internet for extended periods of time (hours). Would there be any adverse effect on the production database by doing this? (I don't strictly need live data - but it would be nice, and good excuse to dabble with replication. If the consensus is that this is a bad idea, I'll set up a daily job to import the previous night's backup into my development database)

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• Switching to Linux for Windows development, bad idea?

  - by krebstar

  I was contemplating switching to Linux for C++ development, coming from a Windows environment. Is this a bad idea? My workplace uses Windows and Visual Studio for our projects (some C# and java too, but right now I'm only developing in C++). If they decide to put me on a C# project, would development still possible (mono?)? What are the difficulties in this sort of transition? Would I have a problem working on their projects and vice versa? I read somewhere that there'd be problems with precompiled headers and such (we do use them), and encodings (tabs/spaces, line endings, etc).. If it's not too hard to do this switch, how do I get started? IDE? vim+make? Thanks. By the way, we make MOSTLY windows software.. EDIT: Thanks guys, I guess that makes sense..

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• What is the most stupid coded solution you have read/improved/witnessed?

  - by Rigo Vides

  And for stupid I mean Illogical, non-effective, complex(the bad way), ugly code style. I will start: We had a requirement there when we needed to hide certain objects given the press of a button. So this framework we were using at the time provided a way to tag objects and retrieve all the objects with a certain tag in a complete iterable collection. So I presented the most logically solution given these conditions to my partner: Me: you know, tag all the objects we needed to hide with the same tag, then call the function to get them all, iterate trough them and make them hidden. Partner: I don't know, that is hardcoding for me... Me: So what do you suggest? 20 mins later... Partner: I don't know... let's put a tag to all the objects to be hidden like this, 1, 2, 3, 4, 5, 6, 7 (and so for each object to be hidden), Then we make a for from 1 to n (where n was the number of objects to hide) and we hide them all there!

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