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  • How to download a wav file from the web to a location on iPhone using NSFileHandle and NSURLConnecti

    - by Jinru
    Hi all, I want to download a wav file from a web service, cache it on the iphone and playback it using AVAudioPlayer. Using NSFileHandle and NSURLConnection seems a viable solution when dealing with relatively large files. However, after running the app in the simulator I don't see any saved file under the defined directory (NSHomeDirectory/tmp). Below is my basic code. Where am I doing wrong? Any thoughts are appreciated! #define TEMP_FOLDER [NSHomeDirectory() stringByAppendingPathComponent:@"tmp"] - (void)downloadToFile:(NSString*)name { NSString* filePath = [[NSString stringWithFormat:@"%@/%@.wav", TEMP_FOLDER, name] retain]; self.localFilePath = filePath; // set up FileHandle self.audioFile = [[NSFileHandle fileHandleForWritingAtPath:localFilePath] retain]; [filePath release]; // Open the connection NSURLRequest* request = [NSURLRequest requestWithURL:self.webURL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; NSURLConnection* connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; } #pragma mark - #pragma mark NSURLConnection methods - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data { [self.audioFile writeData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError*)error { NSLog(@"Connection failed to downloading sound: %@", [error description]); } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; [audioFile closeFile]; }

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  • "a.parentNode is undefined" error in this jquery function...

    - by Pandiya Chendur
    I use the following jquery pagination plugin and i got the error a.parentNode is undefined when i executed it... <script type="text/javascript"> $(document).ready(function() { getRecordspage(1, 5); $(".pager").pagination(17, { callback: pagechange, current_page: '0', items_per_page: '5', num_display_entries : '5', next_text: 'Next', prev_text: 'Prev', num_edge_entries: '1' }); }); function pagechange() { $(this).addClass('current').siblings().removeClass('current'); $("#ResultsDiv").empty(); $("#ResultsDiv").css('display', 'none'); getRecordspage($(this).text(), 5); } </script> and in my page, <div id="ResultsDiv" style="display:none;"> </div> <div id="pager" class="pager"> </div> Any suggestion....

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  • Android: How to call call ndk function from AsyncTask?

    - by user1628803
    I have a lot of jni calls in my Android projects which work like a charm but this one I just can't get right: When trying to call a jni function from an AsyncTask in Android I get this error message: 11-30 10:07:20.130: W/dalvikvm(16555): No implementation found for native Lcom/company/MainView$MyAsyncTask;.MyFunction (Ljava/lang/String;)Z When usually the jni function declaration works like this: JNIEXPORT jboolean JNICALL Java_com_company_MainView_myFunction()... how would i declare it when calling from an AscnyTask? I didn't find the answer on Google and I have unsuccessfully tried: JNIEXPORT jboolean JNICALL Java_com_company_MainView$MyAsyncTask_myFunction() and JNIEXPORT jboolean JNICALL Java_com_company_MainView_MyAsyncTask_myFunction() Or is this not possible at all?

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  • Function missing but file including it is loaded? (Uncaught ReferenceError: flashembed is not defined)

    - by jerrygarciuh
    jQuery Tools is a stand-alone library that offers a flashembed() function; it does not require jQuery. But with or without jQuery I am seeing error Uncaught ReferenceError: flashembed is not defined Page html from here and a JSFiddle of it. <div class="ads-box" id="ad1"> <script>flashembed("ad1", "/g/shows/sidebar/72940064_ad_swf.swf");</script> </div> <script src="http://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js"></script> The SWF is not 404 http://www.itsneworleans.dreamhosters.com/g/shows/sidebar/72940064_ad_swf.swf And the CDN file has the flashembed function and resources tab shows it loaded. http://cdn.jquerytools.org/1.2.7/full/jquery.tools.min.js What is my next step in debugging this?

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  • What does the obscure javascript error b(e.target).zIndex is not a function mean?

    - by stormist
    To give more information I am using the modular form here: http://jqueryui.com/demos/dialog/#modal-form b(e.target).zIndex is not a function [Break on this error] (function(a){a.widget("ui.mouse",{opti...is._unrotate}return this}})})(jQuery); /js/jquery-ui.min.js I also seem to be getting the error "Too much recursion" too much recursion [Break on this error] 3||a.nodeType===8)){if(a.setInterval&&...this.special[o]||{};if(!t){t=e[o]={}; https://my.dev.peer1.com/js/jquery/jquery-1.4.min.js I know its not much to go on but I was hoping someone might have experience with similar issues.

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  • Jquery: Preload an image on request with a callback function?

    - by tarnfeld
    Hey, I'm helping out a friend with a website he's developing and we are having trouble with preloading images on request. Basically, when the user clicks on a thumbnail of the product a <div> slides down that includes a scrolling carrousel of large images. In total there are about 20MB of images that could be loaded in (if you did them all) so preloading them on the page load would not be an option. Is there a way that we could call a javascript function that begins to preload about 4 images and then when it's done it has a callback function? Thanks! P.S. We are using jQuery on the page...

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  • Beautiful soup how print a tag while iterating over it .

    - by Bunny Rabbit
    <?xml version="1.0" encoding="UTF-8"?> <playlist version="1" xmlns="http://xspf.org/ns/0/"> <trackList> <track> <location>file:///home/ashu/Music/Collections/randomPicks/ipod%20on%20sep%2009/Coldplay-Sparks.mp3</location> <title>Coldplay-Sparks</title> </track> <track> <location>file:///home/ashu/Music/Collections/randomPicks/gud%201s/Coldplay%20Warning%20sign.mp3</location> <title>Coldplay Warning sign</title> </track>.... My xml looks like this , i want to get the locations, i am trying from BeautifulSoup import BeautifulSoup as bs soup = bs (the_above_xml_text) for track in soup.tracklist: print track.location.string but that is not working because i am getting AttributeError: 'NavigableString' object has no attribute 'location' how can i achive the result , thanks in advance.

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  • What Is The Proper Location For One-Offs In VCS Repos?

    - by Joe Clark
    I have recently started using Mercurial as our VCS. Over the years, I have used RCS, CVS, and - for the last 5 years - SVN. Back 13 years ago, when I primarily used CVS and RCS, large projects went into CVS and one-offs were edited in place on the specific server and stored in RCS. This worked well as the one-offs were usually specific to the server and the servers were backed up nightly. Jump forward a decade and a lot of the one-off scripts became less centralized - they might be needed on any server at some random time. This was also OK, because now I was a begrudging SVN user. Everything (except for docs) got dumped into one repo. Jump to 2010. Now I am using Mercurial and am putting large projects in their own repo again. But what to do with the one-offs? The options as I see them: A repo for each script. It seems a bit cluttered to create a repo for every one page script that might get ran once a year. RCS Not an option. There are many possible servers that might need a specific script. Continuing to use SVN just for one-offs. No. There no advantage I see over the next option. Create a repo in Mercurial named "one-offs". This seems the most workable. The last option seems the best to me - however; is there a best practice regarding this? You also might be wondering if these scripts are truly one-offs if they will be reused. Some of them may be reused 6 months or a year from now - some, never. However, nearly all of them involve several man-hours of work due to either complex logic or extensive error checking. Simply discarding them is not efficient.

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  • How to implement JQuery easing into this window scroll movement function?

    - by Mohammad
    With this code I've been able to capture the mousewheel movement and apply it to the horizontal scroll bars instead of the vertical default. $('html').bind('mousewheel', function(event, delta) { window.parent.scrollBy(-120 * delta, 0); return false; }); Is there any way that I could add this jQuery easing animation to the scroll movement? jQuery.extend( jQuery.easing, { easeInOutBack: function (x, t, b, c, d, s) { if (s == undefined) s = 1.70158; if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b; return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b; } }); Thank you so much in advance!

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  • Can you force a crash if a write occurs to a given memory location with finer than page granularity?

    - by Joseph Garvin
    I'm writing a program that for performance reasons uses shared memory (alternatives have been evaluated, and they are not fast enough for my task, so suggestions to not use it will be downvoted). In the shared memory region I am writing many structs of a fixed size. There is one program responsible for writing the structs into shared memory, and many clients that read from it. However, there is one member of each struct that clients need to write to (a reference count, which they will update atomically). All of the other members should be read only to the clients. Because clients need to change that one member, they can't map the shared memory region as read only. But they shouldn't be tinkering with the other members either, and since these programs are written in C++, memory corruption is possible. Ideally, it should be as difficult as possible for one client to crash another. I'm only worried about buggy clients, not malicious ones, so imperfect solutions are allowed. I can try to stop clients from overwriting by declaring the members in the header they use as const, but that won't prevent memory corruption (buffer overflows, bad casts, etc.) from overwriting. I can insert canaries, but then I have to constantly pay the cost of checking them. Instead of storing the reference count member directly, I could store a pointer to the actual data in a separate mapped write only page, while keeping the structs in read only mapped pages. This will work, the OS will force my application to crash if I try to write to the pointed to data, but indirect storage can be undesirable when trying to write lock free algorithms, because needing to follow another level of indirection can change whether something can be done atomically. Is there any way to mark smaller areas of memory such that writing them will cause your app to blow up? Some platforms have hardware watchpoints, and maybe I could activate one of those with inline assembly, but I'd be limited to only 4 at a time on 32-bit x86 and each one could only cover part of the struct because they're limited to 4 bytes. It'd also make my program painful to debug ;)

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  • How to have a function with a nullable string parameter in Go?

    - by yuku
    I'm used to Java's String where we can pass null rather than "" for special meanings, such as use a default value. In Go, string is a primitive type, so I cannot pass nil (null) to a parameter that requires a string. I could write the function using pointer type, like this: func f(s *string) so caller can call that function either as f(nil) or // not so elegant temp := "hello"; f(&temp) but the following is unfortunately not allowed: // elegant but disallowed f(&"hello"); What is the best way to have a parameter that receives either a string or nil?

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  • How can I refactor this to use an inline function or template instead of a macro?

    - by BillyONeal
    Hello, everyone :) I have a useful macro here: #define PATH_PREFIX_RESOLVE(path, prefix, environment) \ if (boost::algorithm::istarts_with(path, prefix)) { \ ExpandEnvironmentStringsW(environment, buffer, MAX_PATH); \ path.replace(0, (sizeof(prefix)/sizeof(wchar_t)) - 1, buffer); \ if (Exists(path)) return path; \ } It's used about 6 times within the scope of a single function (that's it), but macros seem to have "bad karma" :P Anyway, the problem here is the sizeof(prefix) part of the macro. If I just replace this with a function taking a const wchar_t[], then the sizeof() will fail to deliver expected results. Simply adding a size member doesn't really solve the problem either. Making the user supply the size of the constant literal also results in a mess of duplicated constants at the call site. Any ideas on this one?

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  • Is there any reasonable use of a function returning an anonymous struct?

    - by Akanksh
    Here is an (artificial) example of using a function that returns an anonymous struct and does "something" useful: #include <iostream> template<typename T> T* func( T* t, float a, float b ) { if(!t) { t = new T; t->a = a; t->b = b; } else { t->a += a; t->b += b; } return t; } struct { float a, b; }* foo(float a, float b) { if(a==0) return 0; return func(foo(a-1,b), a, b); } int main() { std::cout << foo(5,6)->a << std::endl; std::cout << foo(5,6)->b << std::endl; void* v = (void*)(foo(5,6)); float* f = (float*)(v); //[1] delete f now because I know struct is floats only. std::cout << f[0] << std::endl; std::cout << f[1] << std::endl; delete[] f; return 0; } There are a few points I would like to discuss: As is apparent, this code leaks, is there anyway I can NOT leak without knowing what the underlying struct definition is? see Comment [1]. I have to return a pointer to an anonymous struct so I can create an instance of the object within the templatized function func, can I do something similar without returning a pointer? I guess the most important, is there ANY (real-world) use for this at all? As the example given above leaks and is admittedly contrived. By the way, what the function foo(a,b) does is, to return a struct containing two numbers, the sum of all numbers from 1 to a and the product of a and b. EDIT: Maybe the line new T could use a boost::shared_ptr somehow to avoid leaks, but I haven't tried that. Would that work?

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  • Alternatives to javascript function-based iteration (e.g. jQuery.each())

    - by Colin
    I've been watching Google Tech Talks' Speed Up Your Javascript and in talking about loops, the speaker mentions to stay away from function-based iterations such as jQuery.each() (among others, at about 24:05 in the video). He briefly explains why to avoid them which makes sense, but admittedly I don't quite understand what an alternative would be. Say, in the case I want to iterate through a column of table cells and use the value to manipulate the adjacent cell's value (just a quick example). Can anyone explain and give an example of an alternative to function-based iteration?

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  • How can I find out which version of emacs introduced a function?

    - by Chris R
    I want to write a .emacs that uses as much of the mainline emacs functionality as possible, falling back gracefully when run under previous versions. I've found through trial and error some functions that didn't exist, for example, in emacs 22 but now do in emacs 23 on the rare occasion that I've ended up running my dotfiles under emacs 22. However, I'd like to take a more proactive approach to this, and have subsets of my dotfiles that only take effect when version = <some-threshold> (for example). The function I'm focusing on right now is scroll-bar-mode but I'd like a general solution. I have not seen a consistent source for this info; I've checked the gnu.org online docs, the function code itself, and so far nothing. How can I determine this, without keeping every version of emacs I want to support kicking around?

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  • how to set breakpoint on function in a shared library which has not been loaded in gdb

    - by pierr
    Hi, I have a shared library libtest.so which will be loaded into the the main program using dlopen. Function test() reside in libtest.so and will be called in the main program through dlsym. Is there any way I could set up a break point on test? Please note that the main programm has not been linked to libtest.so during linking time. Otherwise , I should be able to set the break point although it is a pending action. In my case, when I do b test, gdb will tell me Function "test" not defined.

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