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  • Why need to call NSTimer again in this code?

    - by Tattat
    - (void) applicationDidFinishLaunching:(UIApplication *)application { //set up main loop [NSTimer scheduledTimerWithTimeInterval:0.033 target:self selector:@selector(gameLoop:) userInfo:nil repeats:NO]; //create instance of the first GameState [self doStateChange:[gsMain class]]; } - (void) gameLoop: (id) sender { [((GameState*)viewController.view) Update]; [((GameState*)viewController.view) Render]; [NSTimer scheduledTimerWithTimeInterval:0.033 target:self selector:@selector(gameLoop:) userInfo:nil repeats:NO]; } This code is from a iPhone game development book. I don't know why the gameLoop method need to call the NSTimer again? in the applicationDidFinishLaunching, it set the NSTimer to do, why don't let it do every 0.033s, why add the same NSTimer code in the gameLoop method? thz.

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  • Call load using a div id that has been passed into a function, div id is a parameter

    - by tittatty
    I am dynamically creating divs within a jquery accordion that are loaded with data as when the user clicks on the accordion title. I have this all working except that when I pass the div id into the load details method, the call to .load() does not work. What can I do to fix this? It seems like a simple javascript string eval would work but I can not find what I am looking for. Code: Here is the basic function: function loadDetails(div_id) { var load_string = "ajax/get_details.aspx"; $(div_id).load(load_string); } This function is called correctly on the click event and the div_id is passed in correctly but the load function is not working. If I use code like this it work correctly: $('#test').load(load_string);

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  • Does C++ require a destructor call for each placement new?

    - by Josh Haberman
    I understand that placement new calls are usually matched with explicit calls to the destructor. My question is: if I have no need for a destructor (no code to put there, and no member variables that have destructors) can I safely skip the explicit destructor call? Here is my use case: I want to write C++ bindings for a C API. In the C API many objects are accessible only by pointer. Instead of creating a wrapper object that contains a single pointer (which is wasteful and semantically confusing). I want to use placement new to construct an object at the address of the C object. The C++ object will do nothing in its constructor or destructor, and its methods will do nothing but delegate to the C methods. The C++ object will contain no virtual methods. I have two parts to this question. Is there any reason why this idea will not work in practice on any production compiler? Does this technically violate the C++ language spec?

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  • How can I call an executable to run on a separate machine within a program on my own machine (win xp

    - by Mr. H.
    My objective is to write a program which will call another executable on a separate computer(all with win xp) with parameters determined at run-time, then repeat for several more computers, and then collect the results. In short, I'm working on a grid-computing project. The algorithm itself being used is already coded in FORTRAN, but we are looking for an efficient way to run it on many computers at once. I suppose one way to accomplish this would be to upload a script to each computer and then run said script on each computer, all automatically and dependent on my own parameters. But how can I write a program which will write to, upload, and run a script on a separate computer? I had considered GridGain, but the algorithm is already coded and in a different language, so that is ruled out. My current guess at accomplishing this task is using Expect (wiki/Expect), but I have no knowledge of the tool. Any advice appreciated.

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  • how to call a php class function directly using ajax?

    - by payling
    Is it possible to call a php class function DIRECTLY using ajax? Something like below... except ajax... myclass::myfunction(); I've been using the jquery library to work with AJAX. $.get('control.php', {func: funcName, arg1: arg1}); The above is similar to what I'm trying to achieve MINUS the control.php; I'm not sure if this is even possible, but I just thought it would be nice to skip the landing page (control.php) that recieves the funcName. I have a bunch of conditional statements that sort out what class function to run based on the funcName recieved. It seems kind of silly to do this, to have a separate page just to handle function calls. Is there a better way?

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  • ASPNET MVC what do you call this, a partial view? Or something else?

    - by JK
    I'm trying to google for info on a situation, but I dont know what it is called, so its hard to find results :) I have a model with say 10 fields. But only some of those are shown on a particular view, lets say 3 of them: id, name, date. What do you call this kind of view that does not display the whole model? A partial view? The problem is that because 7 fields are not sent to the view, when the Update action is called on the controller, those fields are null, and the DB gets updated with those 7 fields set to null.

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  • How would one call std::forward on all arguments in a variadic function?

    - by Noah Roberts
    I was just writing a generic object factory and using the boost preprocessor meta-library to make a variadic template (using 2010 and it doesn't support them). My function uses rval references and std::forward to do perfect forwarding and it got me thinking...when C++0X comes out and I had a standard compiler I would do this with real variadic templates. How though, would I call std::forward on the arguments? template < typename ... Params void f(Params ... params) // how do I say these are rvalue reference? { y(std::forward(...params)); //? - I doubt this would work. } Only way I can think of would require manual unpacking of ...params and I'm not quite there yet either. Is there a quicker syntax that would work?

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  • How do I load every UserForm without having to call .Show individually?

    - by Daniel Cook
    I wanted to figure out how you could load every UserForm without having to call Userform1.Show UserForm2.Show etc. This was inspired by comments on this answer: Excel VBA UserForm_Initialize() in Module. I found this method suggested in a few places: Sub OpenAllUserForms() Dim uf As UserForm For Each uf In UserForms uf.Show Next End Sub However, no Userforms display regardless of how many are attached to the workbook. When I stepped through the code I determined that the UserForms collection is empty! How can I load each Userform without having to explicitly show each one?

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  • How do I produce an external URL as part of a replace_html call in Ruby on Rails?

    - by vlasits
    Basically, I am attempting to render an external website (the url of which is stored in the database) into a page in my Ruby on Rails app. I have a field in my model 'search' called 'search' that contains web addresses with the form 'www.example.com' or 'example.com'. I am trying to use a link_to_function call with replace_html to replace the 'maincontent' div with an iframe tag using the value of 'search' in the current instance as the src for the tag. My current attempt is the very ugly code below. I'd be grateful for either of the following types of responses: How can I rewrite the concatenation string to work correctly? How can I get the same effect (replacing the current content of the "mainContent" div with an iframe tag using a different method? (I had to modify the code before to remove the < from the iframe) link_to_function h(search.title) do |page| page.replace_html 'mainContent', 'iframe id="embedded" src="http://" + #{search.search} />' end

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  • C++ - How to call a member function for an inherited object.

    - by Francisco P.
    Hello! I have a few classes (heat, gas, contact, pressure) inheriting from a main one (sensor). I have a need to store them in a vector<Sensor *> (part of the specification). At some point in time, I need to call a function that indiscriminately stores those Sensor *. (also part of the specification, not open for discussion) Something like this: for(size_t i = 0; i < Sensors.size(); ++i) Sensors[i]->storeSensor(os) //os is an ofstream kind of object, passed onwards by reference Where and how shall storeSensor be defined? Is there any simple way to do this or will I need to disregard the specification? Mind you, I'm a beginner! Thanks for your time!

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  • How to call split(token) on a string that does not contain the token without causing an error?

    - by Vorinowsky
    I have two types of strings as the IDs of elements in my HTML markup: Dates: "april-23" "march-20" and season names: "springtime" "winter" The dates have a dash separating the month and the day. The seasons are a single word with no other tokens. I want to assign the month or the season to a new variable called: time_of_year If I do this: var time_of_year = $(this).attr("id").split('-')[0]; It will work on the months but if I call it on a season name which does not contain the token, will it generate an error? What's the safe way to do this?

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  • Call external library from PHP. What is faster: exec or extension?

    - by robusta
    Hi, I need to make calls from webpage to external library written in C++ and display the result. Platform is Linux, Apache, PHP. My current idea is to use PHP service which will call my library/program. I found that there are two possible ways to do this: 1) use PHP 'exec' function 2) write PHP extension I am curious what works more effective? Faster? Less load the server? I will probably need to do 4 calls per second, so I want to be as optimal as possible. P.S. If you are aware of some other (more effective) way of calling C++ library or program from webpage, please let me know. Thanks a lot, Robusta

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  • How to call method written in C# class library from Silverlight application(xaml.cs file) ?

    - by Shyju
    Can a Silverlight application call a method in a full .NET c# class library? I am trying to add a Silverlight control to my Existing ASP.NET project where i used to add reference to my Business Logic Project and access methods from My UI pages of ASP.NET Web application. Now I have added one Silverlight project to my solution. How can I use the already existing BL method which is in a C# class library ? When tried to add reference, it is saying that "You can only add project reference to other silver light projects in the solution". Should i give up ? Is there any way to get rid of this ?

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  • const member functions can call const member functions only?

    - by Abhi
    Hi all. Do const member functions call only const member functions? class Transmitter{ const static string msg; mutable int size; public: void xmit() const{ size = compute(); cout<<msg; } private: int compute() const{return 5;} }; string const Transmitter::msg = "beep"; int main(){ Transmitter t; t.xmit(); return EXIT_SUCCESS; } If i dont make compute() a const, then the compiler complains. Is it because since a const member function is not allowed to modify members, it wont allow any calls to non-consts since it would mean that the const member function would be 'indirectly' modifying the data members?

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  • How to call function on parent page from iframe using jQuery?

    - by Michael
    I have an upload form that posts to a hidden iframe. I am attempting to call a function on the parent page from the iframe, but am getting the error "top.stopUpload is not a function". What is the correct way to do this? PARENT PAGE: $(document).ready(function() { $('#document_upload').submit( function() { $('#upload_progress').show(); }); function stopUpload(success){ if (success == 1){ $('#result', window.parent.document).html( '<span class="msg">The file was uploaded successfully!<\/span>'); } else { $('#result', window.parent.document).html( '<span class="emsg">There was an error during file upload!<\/span>'); } $('#upload_progress').hide(); return true; } }) IFRAME: $(document).ready(function() { top.stopUpload(<?php echo $result; ?>); }

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  • How to call a function from a shared library?

    - by Frank
    What is the easiest and safest way to call a function from a shared library / dll? I am mostly interested in doing this on linux, but it would be better if there were a platform-independent way. Could someone provide example code to show how to make the following work, where the user has compiled his own version of foo into a shared library? // function prototype, implementation loaded at runtime: std::string foo(const std::string); int main(int argc, char** argv) { LoadLibrary(argv[1]); // loads library implementing foo std::cout << "Result: " << foo("test"); return 0; } BTW, I know how to compile the shared lib (foo.so), I just need to know an easy way to load it at runtime.

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  • How to Get the Method/Function Call Trace for a Specific Run?

    - by JackWM
    Given a Java or JavaScript program, after its execution, print out a sequence of calls. The calls are in invocation order. E.g. main() { A(); } A() { B(); C(); } Then the call trace should be: main -> A() -> B() -> C() Is there any tool that can profile and output this kind of information? It seems this is common a need for debugging or performance tuning. I noticed that some profilers can do this, but I prefer a simpler/easy-to-use one. Thanks!

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  • scala coalesces multiple function call parameters into a Tuple -- can this be disabled?

    - by landon9720
    This is a troublesome violation of type safety in my project, so I'm looking for a way to disable it. It seems that if a function takes an AnyRef (or a java.lang.Object), you can call the function with any combination of parameters, and Scala will coalesce the parameters into a Tuple object and invoke the function. In my case the function isn't expecting a Tuple, and fails at runtime. I would expect this situation to be caught at compile time. object WhyTuple { def main(args: Array[String]): Unit = { fooIt("foo", "bar") } def fooIt(o: AnyRef) { println(o.toString) } } Output: (foo,bar)

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  • How to make a call to an executable from Python script?

    - by fx
    I need to execute this script from my Python script. Is it possible? The script generate some outputs with some files being written. How do I access these files? I have tried with subprocess call function but without success. fx@fx-ubuntu:~/Documents/projects/foo$ bin/bar -c somefile.xml -d text.txt -r aString -f anotherString >output The application "bar" also references to some libraries, it also creates some files besides the output. How do I get access to these files? Just by using open()? Thank you,

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  • Force to call virtual base function instead of the overriden one.

    - by Roberto Sebestyen
    In the following example "Test that v1 function was called" fails. Is there a way to force call the base implementation of "RunFunction" through an instance of "class V2" ?? class V1 { public virtual string RunFunction() { return "V1"; } } class V2 : V1 { public override string RunFunction() { return "V2"; } } [Test] public void TestCall() { var v1 = (V1)new V2(); var v2 = new V2(); Assert.IsTrue(v1.RunFunction() == "V1", "Test that v1 function was called"); Assert.IsTrue(v2.RunFunction() == "V2", "Test that v2 function was called"); }

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  • Do you have to call .Save() when modifying a application setting that is bound to a control property

    - by Jordan S
    I am programming in .NET I have an application setting of type string. On my form I have a textbox. I bound the text property of the textbox to my application setting. If I type something in the textbox it changes the value that is held in the Application setting but the next time I start the program it goes back to the default value. Do I need to call Properties.Settings.Default.Save(); after the text is entered for the new value to be saved? Shouldn't it do this automatically? Is there a way I can make it do it automatically?

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  • When would I need to call base() in C#?

    - by user310291
    My BaseClass Constructor is called whereas I have a constructor in derived class so when would I need to call base() ? class BaseClass { public BaseClass() { Debug.Print("BaseClass"); } } class InheritedClass : BaseClass { public InheritedClass() { Debug.Print("InheritedClass"); } } private void Form1_Load(object sender, EventArgs e) { InheritedClass inheritedClass = new InheritedClass(); } Output 'Inheritance.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll' 'Inheritance.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. BaseClass InheritedClass The thread 'vshost.RunParkingWindow' (0x12b4) has exited with code 0 (0x0). The thread '<No Name>' (0x85c) has exited with code 0 (0x0). The program '[4368] Inheritance.vshost.exe: Program Trace' has exited with code 0 (0x0). The program '[4368] Inheritance.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).

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  • AS3 - Can I have access to the object (or function) who call me?

    - by lk
    I've asked this same question with Python. Now I like to know if this can be done in AS3. If I have something like this: package { public class SomeClass { private function A():void { C() } private function B():void { C() } private function C():void { // who is the caller, A or B ??? } public function SomeClass() { A() B() } } } Despite the design or other issues, this is only a question of an inquiring mind. Note: This has to be done without changing C signature Note 2: I like to have an access to an instance of the caller function so I can call that caller function (if I want to)

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  • Throttling Postfix memory

    - by teddybeard
    I have a VPS on 1and1 similar to this configuration (512MB, burst up to 2GB). I run a web service where I crawl the web and notify my users through email and sms when a certain online data feed changes. When I send the emails out, I just have PHP loop through the recipients list and send the emails out using the mail() function. Whenever I try to send a large volume of these messages out, my server starts acting funny. I can't even run an 'ls' sometimes because the shell tells me it 'cannot allocate memory'. The shell is unusable and yet my website is being served up fine. Mail.err contains: Nov 14 17:30:09 s15351477 postfix/smtp[26000]: fatal: inet_addr_local[getifaddrs]: getifaddrs: Cannot allocate memory Nov 14 17:30:09 s15351477 postfix/sendmail[25999]: fatal: username(1000): unable to execute /usr/sbin/postdrop -r: Success Nov 14 18:29:14 s15351477 postfix/smtp[9911]: fatal: inet_addr_local[getifaddrs]: getifaddrs: Cannot allocate memory Nov 14 18:29:14 s15351477 postfix/sendmail[9910]: fatal: username(1000): unable to execute /usr/sbin/postdrop -r: Success Also, if relevant, my bean counters are: Version: 2.5 uid resource held maxheld barrier limit failcnt 53907331: kmemsize 20779422 21041560 31457280 34603008 2989403 lockedpages 0 0 512 512 0 privvmpages 81488 82498 524288 576716 94640 shmpages 2831 2831 32768 32768 0 dummy 0 0 9223372036854775807 9223372036854775807 0 numproc 90 91 128 128 6603 physpages 32692 33531 2147483647 2147483647 0 vmguarpages 0 0 131072 2147483647 0 oomguarpages 32942 33781 9223372036854775807 2147483647 0 numtcpsock 22 23 720 720 0 numflock 27 28 376 413 0 numpty 1 1 32 32 0 numsiginfo 0 1 512 512 0 tcpsndbuf 425888 441064 3440640 5406720 0 tcprcvbuf 369200 376832 3440640 5406720 0 othersockbuf 268000 268464 2252160 4194304 0 dgramrcvbuf 0 8472 524288 576716 0 numothersock 180 182 720 720 0 dcachesize 952146 966231 5242880 5767168 0 numfile 3609 3683 8192 8192 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 numiptent 25 25 200 205 0 Is there some way I can throttle postfix to keep it from swamping the system like this? Also wondering: why does email use so many resources, these emails are just short text?

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