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  • Why do they initialize pointers this way?

    - by Rob
    In almost all of the books I read and examples I go through I see pointers initialized this way. Say that I have a class variable NSString *myString that I want to initialize. I will almost always see that done this way: -(id)init { if (self = [super init]) { NSString *tempString = [[NSString alloc] init]; myString = tempString; [tempString release]; } return self; } Why can't I just do the following? -(id)init { if (self = [super init]) { myString = [[NSString alloc] init]; } return self; } I don't see why the extra tempString is ever needed in the first place, but I could be missing something here with memory management. Is the way I want to do things acceptable or will it cause some kind of leak? I have read the Memory Management Guide on developer.apple.com and unless I am just missing something, I don't see the difference.

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  • Ternary Operators in JavaScript Without an "Else"

    - by Oscar Godson
    I've been using them forever, and I love them. To me they see cleaner and i can scan faster, but ever since I've been using them i've always had to put null in the else conditions that don't have anything. Is there anyway around it? E.g. condition ? x=true : null ; basically, is there a way to do: condition ? x=true; Now it shows up as a syntax error...

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  • g++: Use ZIP files as input

    - by Notinlist
    We have the Boost library in our side. It consists of huge amount of files which are not changing ever and only a tiny portion of it is used. We swap the whole boost directory if we are changing versions. Currently we have the Boost sources in our SVN, file by file which makes the checkout operations very slow, especially on Windows. It would be nice if there were a notation / plugin to address C++ files inside ZIP files, something like: // @ZIPFS ASSIGN 'boost' 'boost.zip/boost' #include <boost/smart_ptr/shared_ptr.hpp> Are there any support for compiler hooks in g++? Are there any effort regarding ZIP support? Other ideas?

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  • Can Django flush its database(s) between every unit test

    - by mikem
    Django (1.2 beta) will reset the database(s) between every test that runs, meaning each test runs on an empty DB. However, the database(s) are not flushed. One of the effects of flushing the database is the auto_increment counters are reset. Consider a test which pulls data out of the database by primary key: class ChangeLogTest(django.test.TestCase): def test_one(self): do_something_which_creates_two_log_entries() log = LogEntry.objects.get(id=1) assert_log_entry_correct(log) log = LogEntry.objects.get(id=2) assert_log_entry_correct(log) This will pass because only two log entries were ever created. However, if another test is added to ChangeLogTest and it happens to run before test_one, the primary keys of the log entries are no longer 1 and 2, they might be 2 and 3. Now test_one fails. This is actually a two part question: Is it possible to force ./manage.py test to flush the database between each test case? Since Django doesn't flush the DB between each test by default, maybe there is a good reason. Does anyone know?

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  • Is there kind of runtime C++ assembler library around?

    - by Anton
    Hi guys! For my small hobby project I need to emit machine code from C++ program in runtime. I have base address 0xDEADBEEF and want to write something like this: Assembler a((void*)0xDEADBEEF); a.Emit() << Push(Reg::Eax) << Push(Reg::Ebx) << Jmp(0xFEFEFEFE); Inline assembler isn't my choice because generated machine code is dependent of the program state. Does anybody know any existing library for doing this? If no, would it be a good idea to develop one from scratch and make it open source? (I mean, will anybody ever use this library if it existed?)

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  • Are there any good reasons why I should not use Python?

    - by coppro
    I've heard from reliable sources that Python is a great language that every programmer can learn, but I've heard so much good about it that I'm clearly not getting the whole picture. I'm considering spending more time to learn it, and I've heard more than I need about its virtues (to the point where I've started recommending it having never really used it), so I want to know its drawbacks, flaws, issues, and every single minor point of irritation you've ever had (preferably with explanations readable to one who doesn't program Python, such as with an example in another language). Convince me not to try it out.

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  • C++ Types Impossible to Name

    - by Kirakun
    While reading Wikipedia's page on decltype, I was curious about the statement, Its [decltype's] primary intended use is in generic programming, where it is often difficult, or even impossible, to name types that depend on template parameters. While I can understand the difficulty part of that statement, what is an example where there is a need to name a type that cannot be named under C++03? EDIT: My point is that since everything in C++ has a declaration of types. Why would there ever be a case where it is impossible to name a type? Furthermore, aren't trait classes designed to yield type informations? Could trait classes be an alternative to decltype?

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  • iOS Downloading Videos and saving in Application Support folder

    - by Satyam svv
    In my application, i've to download videos around 10 to my application and play accordingly. Each video is around 50 MB. I'm using following code and then after downloading the video, i'm saving it to Application support folder to avoid icloud sync. But the problem is that when downloading the videos its crashing. [NSURLConnection sendAsynchronousRequest:req queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *rcvdDat, NSError * err) { . . . } What I'm thinking is that, while downloading the video, it resides in memory and so the total memory occupying by the app is increasing. Finally iOS is making the app to close. I would like to download the video and when ever a stream of data received, write to temp file and when completes move it to application support folder. Can some one help me on how to write it to file and save it at the end? I cannot use 3rd party libraries (unless its small) due to legal issues.

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  • Confusion using MYSQLI

    - by user1020069
    I just started using mysqli API for PHP. Apparently, every time an object of the class MYSQLI is instantiated, it can setup a connection to the database as it connects to the server unlike mysql_connect, which connects to the server first and then you are required to specify the database to query. Now this is a good problem if the db exists, in my case, the db does not exist on the first ever connection to the server/execution of the problem, hence I must connect without specifying the database, which is fine, since the msyqli constructor does not make this database mandatory. My challenge is essentially, how do I check if the database exists before attempting the first connection. The only way to really do this would be to establish a conection to the server and then use the result of the following query to gauge if the database exists: SELECT COUNT(*) AS `exists` FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMATA.SCHEMA_NAME="dbname" ; If this returns true, then the database exists, but now the challenge is how do I get the mysqli object to query this database rather than having to prefix the name of the database in the query. Thanks much

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  • Are these 2 sql queries equivalent in all respects (e.g. estimated and actual execution plan)?

    - by Xerion
    Are query 1) == 2) in terms of estimated query plan AND actual plan? (can statistics affect the actual plan here, ever?) declare @cat int -- input param from prc ... 1) select * from A as a join B as b on b.id = a.id on b.cat = @cat join C as c on c.fid = b.fid on c.cat = @cat where a.cat = @cat 2) select * from A as a join B as b on b.id = a.id on b.cat = a.cat join C as c on c.fid = b.fid on c.cat = b.cat where a.cat = @cat It seems to me that these should logically be equivalent and the execution plan should always be the same regardless of actual difference in tables. And adding more conditions either in join, or where, or add more tables to join shouldn't change this. Are there cases this is not true?

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  • Problem with displaying my Image..

    - by Josh
    Here is my full problem so if anyone has any ideas or can offer some help, please let me know. I have a Website that will generate a Report and this Report takes some time to create. There is a MyReport.ASPX file that has a form1, Image1, and a ReportViewer control. There is also a MyReport.cs file that has C# code to generated a HTMLText string that the ReportViewer control will display. When I pull the Website up in the browser, the MyReport.cs file creates the Report before MyReport.ASPX ever gets called so my Image1 (which I need to display while the Report is being created) never gets displayed until AFTER the Report is created and displayed. What do you suggest I do here? If I did not supply enough information, please let me know what else you need to know and I will gladly post it. Thanks,

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  • How to design model for multi-tiered data?

    - by Chris
    Say I have three types of object: Area, Subarea and Topic. I want to be able to display an Area, which is just a list of Subareas and the Topics contained in those Subareas. I never want to be able to display Subareas separately - they're just for breaking up the Topics. Topics can, however, appear in multiple Areas (but probably under the same Subarea). How would I design a model for this? I could use ForeignKey from Topic to Subarea and from Subarea to Area, but it seems unnecessarily complex given that I never want to interact with subareas themselves. Also, none of these objects are ever altered or added to by the user. They're just for me to represent information. Maybe there is a better way to represent it all?

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  • Rails model to represent multiple fields

    - by Tristan O'Neil
    I'm developing a rails project where I have one data model with multiple fields that are collection selects. I'd like to create another model to represent all of these collection select fields. So, for instance, my main data model has three collection select fields -- one for county, one for category, and one for classification. I could separate these into three separate data models, but that seems redundant since they all share the same characteristics. They have a type and a value, like a county is a county and it has a value of let's say Sonoma, just as category has a type of category and a value of let's say Winery. If you've ever used Drupal, I'm basically looking for the behavior of the taxonomy functionality. So you see my dilemma: I need to separate these fields into three separate fields but they have very similar data structures. Any suggestions would be greatly appreciated.

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  • MySQL SELECT WHERE returning empty with long numbers, although they are there

    - by brybam
    Alright, so basically the most simple query ever... I've done this a million times... SELECT * FROM purchased_items WHERE uid = '$uid' if $uid == 123 It works fine and returns all data in rows where uid is 123 if $uid == 351565051447743 It returns empty... I'm positive 351565051447743 is a possible uid in some rows, i literally copied and pasted it into the table. $uid is a string, and is being passed as a string. This is something i've done a million times, and i've never had this simple query not work. Any ideas why this is not working?

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  • What is the reliable way to return error code from an MPI program?

    - by mezhaka
    The MPI standard (page 295) says: Advice to users. Whether the errorcode is returned from the executable or from the MPI process startup mechanism (e.g., mpiexec), is an aspect of quality of the MPI library but not mandatory. Indeed I had no success in running the following code: if(0 == my_rank) { FILE* parameters = fopen("parameters.txt", "r"); if(NULL == parameters) { fprintf(stderr, "Could not open parameters.txt file.\n"); printf("Could not open parameters.txt file.\n"); exit(EXIT_FAILURE); //Tried MPI_Abort() as well } fscanf(parameters, "%i %f %f %f", N, X_DIMENSION_Dp, Y_DIMENSION_Dp, HEIGHT_DIMENSION_Dp); fclose(generation_conf); } I am not able to get the error code back into the shell in order to make a decision on further actions. Neither of two error messages are printed. I think I might write the error codes and messages to a dedicated file. Has anyone ever had a similar problem and what were the options you've considered to do a reliable error reporting?

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  • FKs on all tables for status colunm

    - by Jonarch
    I have a colunm "Status" in every table in my DB. The purpose of it is to show if the given row is in use or if it has been deactivated. So values can be (0=deactive and 1= active). Two ways I see this: I can have enums or I am thinking if it is better to keep this colunm as a FK which references the main system data dictionary table which has all the codes used on the system. (website) The benefit is every table, every row can then be centralized through this FK. So if i ever want to check all rows which are deactive on my system i can from this table as all th child tables will have like status = ID 233, where 233 = deactive in the data dictionary table. Any benefit or should i stick with the old way of enums?. Also I am thinking if i need one more status for deleted or is that same as deactivated?

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  • What is the use of commit messages?

    - by eteubert
    Hi folks, I struggled asking that question but here it is. I am using source control since several years for multiple projects using different systems (svn, hg, git) and I learned how to improve my messages by following guidelines etc. But as far as I can remember I never ever had a look at them afterwards. So ... how do you profit from your own commit messages? When I need to go back because I smashed something and need a fresh start, I usually just go back to the latest "node" (where I started or merged a branch). Do I write those messages just for people monitoring the project who are curious what is going on? Regards

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  • Secure C# Assemblies from unauthorized Callers

    - by Creepy Gnome
    Is there any way to secure your assembly down to the class/property & class/method level to prevent the using/calling of them from another assembly that isn't signed by our company? I would like to do this without any requirements on strong naming (like using StrongNameIdentityPermission) and stick with how an assembly is signed. I really do not want to resort to using the InternalsVisibleTo attribute as that is not maintainable in a ever changing software ecosystem. For example: Scenario One Foo.dll is signed by my company and Bar.dll is not signed at all. Foo has Class A Bar has Class B Class A has public method GetSomething() Class B tries to call Foo.A.GetSomething() and is rejected Rejected can be an exception or being ignored in someway Scenario Two Foo.dll is signed by my company and Moo.dll is also signed by my company. Foo has Class A Moo has Class C Class A has public method GetSomething() Class C tries to call Foo.A.GetSomething() and is not rejected

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  • What are the typical reasons Javascript developed on IE fails on Firefox?

    - by lwburk
    Inspired by this post it occurs to me that I often suffer from the opposite problem. That is, I've got code in a legacy application designed only for Internet Explorer and I need to get it to work in Firefox. For example, I recently worked on an app that made heavy use of manually simulating click events, like this: select.options[0].click(); ...which completely broke the application in Firefox. But you wouldn't find that information in the answers to the other question, because that's not something you'd ever even attempt if your app first targeted Firefox. What other things should a developer updating a legacy IE-only application look for when migrating to modern browsers?

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  • Major inconsistencies in Zend Framework

    - by John Nall
    Okay first of all let me just say Zend Framework is the greatest tool I have ever used in 30+ years of programming (well, for web development, Qt wins the desktop market). However, through my use I have noticed some glaring and annoying inconsistencies. For instance, Zend_Form_Element's have a setAttrib() method. Now why the hell is this the only method in that API which is abbrev.? Why then am I using setRequired() instead of setReq()? I have more examples, I am extremely nerd raged about this. It is completely ruining what could have been God's gift to web development. FOR FUTURE REFERENCE NEVER ABBREV. THINGS WHEN MAKING AN API. also always filter data before storing it i m o Who do we talk to about this, where something will actually get done about it?

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  • Can someone help me understand why this is happening?

    - by Juan Manuel Formoso
    I just run into the weirdest thing I've ever encounter. Consider this test page: <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title></title> <script language=javascript> function test(myParameter) { alert(myParameter); } </script> </head> <body> <input type="button" value="Strange" onclick="javascript: test(044024);" /> <input type="button" value="Ok" onclick="javascript: test('044024');" /> </body> </html> If I click the "strange" button, I get 18452, if I click the "ok" button I get 044024 Does anyone know what is happening and explain it to me?

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  • ASP/HTML problem with spaces and monofonts

    - by nickik
    I have a ASP has a Function that converts ä to &auml so far so good. I have lets say space for 10 char's if there are more cut them of if there are less fill the space up with &nbsp's. . Like this: test &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp but if i say "täst" it does this: te &auml t &nbsp It interprets the &auml not as one char it looks at it as 6 chars. Is there a clever way around that? This problem messes up my design because I need the right count of spaces. The whole thing goes into a big select box. Of you have to add a ; at the end of ever &... I could add them because the Editor would really interprt them.

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  • Hibernate Query - Get latest versions by timestamp?

    - by Slim
    I have a database that is being used as a sort of version control system. That is, instead of ever updating any rows, I add a new row with the same information. Each row also contains a version column that is a date timestamp, so the only difference is the new row will have a more recent timestamp. What I'm having trouble with is writing an efficient hibernate query to return the latest version of these rows. For the sake of example, these are rows in a table called Product, the timestamped column is version. There are multiple versions of multiple products in the table. So there may be multiple versions (rows) of ProductA, multiple versions of ProductB, etc. And I would like to grab the latest version of each. Can I do this in just a single hibernate query? session.createQuery("select product from Product product where...?"); Or would this require some intermediate steps?

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  • Visual Studio ate my toobar :'(

    - by j-t-s
    Visual Studio ate my toolbar, I opened a solution for a project I've been working on for a few months, and the toolbar has 135 buttons on it, and while it was loading, the whole toolbar flickered like it was trying to give me a seizure or something, and then it dissappeared. Now when I click Debug, it won't let me do it because all the resources are missing!? I'm using: Visual Studio 2010 C# Express Windows 7 Home Premium 64-bit. I have searched Google and found nothing related. I'm hoping that Visual Studio can also somehow make bowel movements so I can find those missing resources and put everything back together again, but I don't think that's a likely scenario... Has anybody ever experienced this before, and if so, are there any updates/fixes for this?

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  • Image along with text in HTML, asp.net

    - by Zerotoinfinite
    Hi experts, I am using asp.net and C#. I have a image and three line. Which I want to place like this Like the one you can see in this below URL . http://www.campaignmonitor.com/gallery/ Image is on the left side and parallel to image we can write text. I know that the same can be acheived by HTML table / ASP.NET table like this first line second line third line but my problem is that I can't use table, so please let me know how can i acheive the above task without using tables. Might be or tag can do the trick. but I am really dumb in html. and I can't ever search the exact answer to my problem on google.. please let me know how to get this. It's urgent, your help or suggestion will help me a lot. Thanks in advance.

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