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• How can I access data that's stored in my App Delegate from my various view controllers?

  - by BeachRunnerJoe

  This question is similar to this other post, but I'm new to iPhone development and I'm getting used to the good practices for organizing my data throughout my app. I understand the ApplicationDelegate object to be the best place to manage data that is global to my app, correct? If so, how can I access data that's stored in my App Delegate from various view controllers? Specifically, I have an array of table section titles for my root table view controller created as such... appdelegate.m sectionTitles = [[NSArray alloc] initWithObjects: @"Title1", @"Title2", @"Title3", nil]; rootViewController.appDelegate = self; and I need to access it throughout the different views of my app, like such... rootviewcontroller.m NSUInteger numSections = [self.appDelegate.sectionTitles count]; Is this the best way to do it or are there any reasons I should organize my data a better way? Thanks so much in advance for your help!

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• MySQL INSERT data does not get stored in proper db, only temporary?

  - by greye

  I'm having trouble with MySQL or Python and can't seem to isolate the problem. INSERTs only seem to last the run of the script and are not stored in the database. I have this script: import MySQLdb db = MySQLdb.connect(host="localhost", user="user", passwd="password", db="example") dbcursor = db.cursor() dbcursor.execute("select * from tablename") temp = dbcursor.fetchall() print 'before: '+str(temp) dbcursor.execute('INSERT INTO tablename (data1, data2, data3) VALUES ("1", "a", "b")') dbcursor.execute("select * from tablename") temp = dbcursor.fetchall() print 'after: '+str(temp) The first time I run it I get the expected output: >>> before: () after: ((1L, 'a', 'b'),) The problem is that if I run it again, the before comes out empty when it should already have the entry in it and the after doesn't break (data 1 is primary key). >>> before: () after: ((1L, 'a', 'b'),) >>> before: () after: ((1L, 'a', 'b'),) >>> before: () after: ((1L, 'a', 'b'),) If I try running the insert command twice in the same script it will break ("Duplicate entry for PRIMARY KEY") Any idea what might be happening here?

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• Typecasting a floating value or using the math.h floor* functions?

  - by nobody

  Hi, I am coding up an implementation of Interpolation Search in C. The question is actually rather simple, I need to use the floating operations to do linear interpolation to find the correct index which will eventually be an integer result. In particular my probe index is: t = i + floor((((k-low)/(high-low)) * (j-i))); where, i,j,k,t are unsigned ints, and high,low are doubles. Would this be equivalent to: t = i + (unsigned int)(((k-low)/(high-low)) * (j-i)); Is there any reason I would actually want to use math.h floor* functions over just a simple (int) typecast?

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• What are the main advantages of adding your custom functions to a javascript libraries namepsace?

  - by yaya3

  It is fairly well known in JavaScript that declaring variables within the global scope is a bad thing. So code I tend to work on contains namespaced JavaScript. There seems to be two different approaches taken to this - Adding your application specific functions to the libraries' namespace e.g. $.myCarouselfunction Creating your own namespace e.g. MyApplication.myCarouselFunction I wanted to know whether or not there is a 'better' solution or if they tend to meet somewhere close in terms of pros and cons. The reason for me personally deciding not to go with the library is for Seperation / Isolation / Lack of conflict with library code and potential plugins that are likely to share that namespace. But I am sure there is more to this. Thanks

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• Is using an OS's functions for retrieving file content type reliable (using PHP < 5.3)?

  - by letseatfood

  I am using PHP versions < 5.3. Is it reliable to use the OS's functions for retrieving file content types? I am just trying to make sure that files are of a specific type before displaying them in a browser. I don't want to rely on just using the file extension. mime_content_type() is deprecated and I do not have the PECL Fileinfo extension. In my case I am using Windows or Linux for my development servers, depending on the job.

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• How do people manage changes to common library files stored across mutiple (Mercurial) repositories?

  - by mckoss

  This is perhaps not a question unique to Mercurial, but that's the SCM that I've been using most lately. I work on multiple projects and tend to copy source code for libraries or utilities from a previous project to get a leg up on starting a new project. The problem comes in when I want to merge all the changes I made in my latest project, back into a "master" copy of those shared library files. Since the files stored in disjoint repositories will have distinct version histories, Mercurial won't be able to perform an intelligent merge if I just copy the files back to the master repo (or even between two independent projects). I'm looking for an easy way to preserve the change history so I can merge library files back to the master with a minimum of external record keeping (which is one of the reasons I'm using SVN less as merges require remembering when copies were made across branches). Perhaps I need to do a bit more up-front organization of my repository to prepare for a future merge back to a common master.

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• How to store local variables in jQuery click functions?

  - by Geuis

  I'm trying to figure out how to store external variable values in the functions created during jQuery's click() event. Here's a sample of the code I'm working with now. for(var i=0; i<3; i++){ $('#tmpid'+i).click(function(){ var gid = i; alert(gid); }); } <div id="tmpid0">1al</div> <div id="tmpid1">asd</div> <div id="tmpid2">qwe</div> So what's happening is that the events are attaching properly, but the value of 'gid' is always the last incremented value of 'i'. I'm not sure how to setup the private variable in this situation.

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• Creating a jQuery plugin: best practices regarding functions' visibility?

  - by marcgg

  I'm creating a jQuery plugin. So far it's working fine, but I'm having doubt about the way I'm doing things: jQuery.fn.myMethod = function() { return this.each(function(){ MyScope.doSomething(jQuery(this).attr("id")); }); }; var MyScope = { doSomething: function(id){ // something doSomethingElse(23); // some more code doSomethingElse(55); }, doSomethingElse: function(someInt){ // some code } }; I use MyScope to store all my "private" functions. I don't want the user to be able to go $("p").doSomething(), but I do need to use them. I could move everything in the myMethod function, but it would create a 100 lines long function and people would hate me for it. What's the best practices in this situation? Are there any great tutorials out there regarding this?

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• Why do I have to specify virtual functions in the declaration of a derived class?

  - by neuviemeporte

  Given the base class A and the derived class B: class A { public: virtual void f(); } class B : public A { public: void g(); } I get errors saying that f() is not declared in B while trying do define void B::f(). Do I have to declare f() explicitly in B? I think that if the interface changes I shouldn't have to correct the declarations in every single class deriving from it. Is there no way for B to get all the virtual functions' declarations from A automatically?

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• Is there an "are you sure" for stored procedure execution? :)

  - by Swoosh

  I have a stored procedure which is doing a lot of delete. Hundreds of thousands of records. It is not going to be runnable from the application, but still, i am concerned, that one of my clients accidentally runs it (i had problems earlier due to their "curiosity") :D Yes. there are backups and stuff like that, but I was thinking .... not to scare them ... is there a way to ask the user "are you sure?" before executing it? :) thanks

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• Import module stored in a cStringIO data structure vs. physical disk file

  - by Malcolm

  Is there a way to import a Python module stored in a cStringIO data structure vs. physical disk file? It looks like "imp.load_compiled(name, pathname[, file])" is what I need, but the description of this method (and similar methods) has the following disclaimer: Quote: "The file argument is the byte-compiled code file, open for reading in binary mode, from the beginning. It must currently be a real file object, not a user-defined class emulating a file." [1] I tried using a cStringIO object vs. a real file object, but the help documentation is correct - only a real file object can be used. Any ideas on why these modules would impose such a restriction or is this just an historical artifact? Are there any techniques I can use to avoid this physical file requirement? Thanks, Malcolm [1] http://docs.python.org/library/imp.html#imp.load_module

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• ANDROID : how to get value stored in ArrayList<HashMap<key,value>>?

  - by Roshni Kyada

  I have ArrayList. At another activity i want to access all values stored in ArrayList. I tried following code. ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>(); for(Hashmap<String, String> map: mylist) { for(Entry<String, String> mapEntry: map) { String key = mapEntry.getKey(); String value = mapEntry.getValue(); } } but it shows an error at for(Entry mapEntry: map) that it only interate over Array.

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• Want to add a new property to a class, can I use anonymous functions for this?

  - by Blankman

  I have 2 Lists: List<User> List<UserStats> So I want to add a property Count to User (it doesn't have one now, and I can't change the implementation at this point). For a web service call, that returns json, I want to modify the User object. Basically I add the Users to a collection. So I want to add a modified user class (via anonymous functions?) to the collection before I serialize it to json. So something like: loop users { user.Count = userstats[user.ID].Count; list.Add(user); } is this possible? how?

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• What reasons are there to place member functions before member variables or vice/versa?

  - by Cory Klein

  Given a class, what reasoning is there for either of the two following code styles? Style A: class Foo { private: doWork(); int bar; } Style B: class Foo { private: int bar; doWork(); } For me, they are a tie. I like Style A because the member variables feel more fine-grained, and thus would appear past the more general member functions. However, I also like Style B, because the member variables seem to determine, in a OOP-style way, what the class is representing. Are there other things worth considering when choosing between these two styles?

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• How to write custom SQLite functions in Javascript inside a Webkit browser?

  - by Jay Godse

  I have just learned how to use the SQLite database for local storage in a Webkit web browser (e.g. Google Chrome or Apple Safari) using the Javascript API. For example the "Sticky Notes" application. However, I know that SQLite has a function called sqlite_create_function() that lets you add custom functions to your instance of SQLite on the fly which can then be used inside SQL queries. This function is described at sqlite.org. I also know that you can call an equivalent of this API in Ruby as described here. QUESTION: Can anybody show me how to do this in Javascript - i.e. write a custom function in Javascript that can be bound into the SQLite database at run time to be called by the SQLite engine, and all inside a Webkit browser?

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• Can functions like sin() be redefined, in Fortran, C or Java?

  - by EOL

  Can a mathematical function like sin() be redefined, in Fortran, C or Java code, while preserving the default behavior of other mathematical functions like cos()? Or can another function named sin() but that accepts different argument types be defined in addition to the built-in sin()? I am interested in general features of these languages (I am thinking of applications like the implementation of non-usual number algebras). I tried to define a sin() function in a Fortran 95 program, but the intrinsic sin() function was called instead… Is there a way around this? what about C and Java?

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• How to parse a string to an integer without library functions?

  - by dack

  Hi, I was recently asked this question in an interview: "How could you parse a string of the form '12345' into its integer representation 12345 without using any library functions, and regardless of language?" I thought of two answers, but the interviewer said there was a third. Here are my two solutions: Solution 1: Keep a dictionary which maps '1' = 1, '2' = 2, etc. Then parse the string one character at a time, look up the character in your dictionary, and multiply by place value. Sum the results. Solution 2: Parse the string one character at a time and subtract '0' from each character. This will give you '1' - '0' = 0x1, '2' - '0' = 0x2, etc. Again, multiply by place value and sum the results. Can anyone think of what a third solution might be? Thanks.

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• Input-type-file path, where is it stored on AJAX request ?!?

  - by Sheavi

  Hi, I have been monitoring the parameters a website receives when a file is uploaded (via an input type="file"). Surprisingly, the parameter and its value were looking like this : parameter: upfile value: filename="this is the name of the uploaded file.png" Content-type: image/x-png Now in this POST request to the server page, the file name and its type is passed into a parameter, but what about the path to that filename? Where is that path stored so that the server page can upload the file at the good location? Also, I would like to know if it would be possible by any way to specify a path, NOT to the input type="file" since its impossible, but to the server (though this question probably depends a lot on how the server-side page is scripted). Thank you for your answers.

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• R: What are the best functions to deal with concatenating and averaging values in a data.frame?

  - by John

  I have a data.frame from this code: my_df = data.frame("read_time" = c("2010-02-15", "2010-02-15", "2010-02-16", "2010-02-16", "2010-02-16", "2010-02-17"), "OD" = c(0.1, 0.2, 0.1, 0.2, 0.4, 0.5) ) which produces this: > my_df read_time OD 1 2010-02-15 0.1 2 2010-02-15 0.2 3 2010-02-16 0.1 4 2010-02-16 0.2 5 2010-02-16 0.4 6 2010-02-17 0.5 I want to average the OD column over each distinct read_time (notice some are replicated others are not) and I also would like to calculate the standard deviation, producing a table like this: > my_df read_time OD stdev 1 2010-02-15 0.15 0.05 5 2010-02-16 0.3 0.1 6 2010-02-17 0.5 0 Which are the best functions to deal with concatenating such values in a data.frame?

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• How can I write this Table Valued Function as a Stored Procedure?

  - by Alex

  I have the following TVF for fulltext search: FUNCTION [dbo].[Fishes_FullTextSearch] (@searchtext nvarchar(4000), @limitcount int) RETURNS TABLE AS RETURN SELECT * FROM Fishes INNER JOIN CONTAINSTABLE(Fishes, *, @searchtext, @limitcount) AS KEY_TBL ON Fishes.Id = KEY_TBL.[KEY] When I'm using this TVF, it doesn't return a collection of objects of type Fish (which I want!) - instead LINQ creates a new result type which includes all "Fish" fields and the fields Key and Rank. In another question, it was suggested that I rewrite this TVF into a stored procedure for it to return Fish objects only. Can someone help me do this please? Also, it needs to be ordered by Rank. Thank you!

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• How can I delete video stored in the photo library ?

  - by srikanth rongali

  I have saved video in to the photo library. -(void)exportVideo:(id)sender { NSString *path = [DOCUMENTS_FOLDER stringByAppendingString:@"/air.mp4"]; NSLog(@"Path:%@", path); NSLog(@"Export Button CLicked"); UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError: contextInfo:), nil); } - (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { NSLog(@"Finished saving video with error: %@", error); } Now I need to delete the video i have stored programmatically. How can I delete the video ? Are there any functions for it? Thank You.

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• Why are my JavaScript variables not persisting across functions?

  - by Eric Belair

  I have the following JavaScript in my HTML page referencing an HTML form on the page: <script type="text/javascript"> <!-- var myForm = document.myForm; function validateForm() { if (myForm.myInput == "") alert("Please input some text."); return false; } myForm.submit(); } function showFormInput() { myForm.reset(); document.getElementById('myInput').style.display = 'inline'; } //--> </script> ... <form name="myForm" id="myForm" action="..." method="post"> <input id="myInput" name="myInput" type="text" value="" style="display:none;" /> </form> Both functions are throwing an exception when trying to access the variable myForm, saying that "myForm is null or not an object". Why is this occurring?

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• PHP multiple __autoload functions *without* the use of spl_register_autoload?

  - by Keith Palmer

  I'm an author of a growing library of PHP + QuickBooks related code. I'd like to utilize PHPs __autoload() function, however my code is a library that other people can include() into their own applications, so I can't rely on __autoload() being not already defined. Is there a way to have multiple __autoload() functions? I saw spl_autoload_register() in the PHP manual, but not all of my users have the SPL extension installed, so I can't rely on that. If there was a way to fall-back to using this and use normal require/include statements by default, I might consider that. Does anyone else have any other clever solutions to this issue? It seems like a glaring oversight to only be able to have a single __autoload() function...

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• How to execute unknown functions from dynamic load libraries?

  - by activenightly

  It's easy to load functions from dynamic libraries when you know this function in design time. just do something like this: int (*fn)(int); l0 = dlopen("./libfoo.so", RTLD_LAZY); if (!l0) { fprintf(stderr, "l0 %s\n", dlerror()); return 1; } fn = (int (*)(int))dlsym(l0, "foo"); if ((error = dlerror()) != NULL) { fprintf(stderr, "fn:%s\n", error); return 1; } x=(*fn)(y); ... How to execute library function when it's unknown in design time? In runtime you have a function name and array of arguments pointers and array of arguments sizes: char* fn_name="foo"; int foo_argc; void* foo_argv[]; int foo_argv_size[]; In scripting language it's a piece a cake task, but how to implement this nicely in c++?

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• Practise Questions for Templates,Functors,CallBack functions in c++?

  - by Eternal Learner

  Hi, I have been reading templates,functors,callback function for the past week and have referred some good books and articles. I however feel that, unless I can get good practice - programming in templates and use functors-callbacks there is no way I can really understand all the concepts or fluently use them while coding. Could anyone suggest some articles or books or websites where , there is a definition of the problem and also a solution to the same. I could just write code for the problem and check later on if my solution is good enough.. I am also aware that some of our stack-overflow members are experts in templates and callback functions. It would be great if they could design a problem and also post a solution , where a lot of template beginners like me could benefit.

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