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  • java generics covariance

    - by soocracy42
    I am having trouble understanding the following article: http://www.ibm.com/developerworks/java/library/j-jtp01255.html Under, Generics are not covariant the author states, Because ln is a List, adding a Float to it seems perfectly legal. But if ln were aliased with li, then it would break the type-safety promise implicit in the definition of li -- that it is a list of integers, which is why generic types cannot be covariant. I can't understand the part where it says "if ln were aliased with li". What does the author means by alias?(reference?). The code snippet above the quoted line seems to illustrate WHAT is illegal in java and not WHY. It would be very helpful to me if somebody could explain with an example. Thanks in advance.

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  • Python + MySQLdb executemany

    - by lhahne
    I'm using Python and its MySQLdb module to import some measurement data into a Mysql database. The amount of data that we have is quite high (currently about ~250 MB of csv files and plenty of more to come). Currently I use cursor.execute(...) to import some metadata. This isn't problematic as there are only a few entries for these. The problem is that when I try to use cursor.executemany() to import larger quantities of the actual measurement data, MySQLdb raises a TypeError: not all arguments converted during string formatting My current code is def __insert_values(self, values): cursor = self.connection.cursor() cursor.executemany(""" insert into values (ensg, value, sampleid) values (%s, %s, %s)""", values) cursor.close() where values is a list of tuples containing three strings each. Any ideas what could be wrong with this? Edit: The values are generated by yield (prefix + row['id'], row['value'], sample_id) and then read into a list one thousand at a time where row is and iterator coming from csv.DictReader.

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  • Should strongly typed partial views on one page in asp.net mvc-2 have one combined view model?

    - by Kai
    Hi guys, I have a question about asp.net mvc-2 strongly typed partial views, and view models. I was just wondering if I can (or should) have two strongly typed partial views on one page, without implementing a whole new view model for that page. For example, I have a page that displays profiles, but also has an inline form to add a quick contact. Each of these entities already has it's own view model, i.e I have a ProfileViewModel and a ContactViewModel. So my view needs two strongly typed partial views, one using an IEnumerable List of ProfileViewModels, and one using a ContactViewModel. Is it possible or desirable to avoid making a third view model, an 'IndexViewModel' for this page, which holds a list of ProfileViewModels and a ContactViewModel? Is not implementing this view model bad practice, or tidier as it results in less view models? Thanks!

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  • When is calculating or variable-reading faster?

    - by Andreas Hornig
    hi, to be honest, I don't really know what the "small green men" in my cpu and compiler do, so I sometimes would like to know :). Currently I would like to know what's faster, so that I can design my code in a more efficient way. So for example I want to calclate something at different points in my sourcecode, when will it be faster to calculate it once and store it in a variable that's read and used for the next points it's needed and when is it faster to calculate it everytime? I think it's depending on how "complex" and "long" the calculation is and how fast then cache is, where variables are stored, but I don't have any clue what's faster :). Thanks for any reply to my tiny but important question! Andreas PS: perhaps it's important to know that I code in JAVA, but it's more a genral question.

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  • C# Class Library wont register for COM

    - by Jordan S
    Hello All, I am trying to gain access to a .NET class library in Microsoft Excel. To do this I know that the .NET class library must be registered with COM. So I tried going to my Assembly Info and Setting COM Visible to true. Then on the build tab I set Register for COM Interop for true also. I checked the AssemblyInfo.cs file and it does contain [assembly: ComVisible(true)]. But for some reason when I try to add a reference to the Class Lib in Excel the namespace does not show up in the list. I made a quick test Class library with nothing in it and did the same thing (set COM Vis = true , and Register For COM Interop = true) and that one does show up on the list of available references. I can't figure out what the difference is between the two classes. I am not sure if my class is actually being registered for COM interop or not. Does anyone know what I can do to fix this???

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  • How can I have HTML tab expansion in ST2 w/ Emmet inside Handlebars templates(emberjs)?

    - by Zuko
    Okay, so I'm using Sublime Text 2 with Emmet. But "Tab" expansion of HTML snippets doesn't work inside a script because of the scope. Example: In HTML, I can type "h1" and then hit tab, and it will generate "" When using Ember.js, and more specifically Handlebars, it doesn't work. <script type="text/x-handlebars"> h1 </script> Pressing tab after that "h1" doesn't expand it because it's inside a script; Emmet turns this off. I can press Ctrl+E, which is the "expand anywhere" hotkey, and that works just fine. However, that is uncomfortable and prone to missing and hitting things like Ctrl+S or Ctrl+D which have undesired effects. So, how can I change this? I tweeted at the developer, and got a reply, https://twitter.com/chikuyonok/status/398708331969540096 But couldn't understand what to do.

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  • Fulltext search for django : Mysql not so bad ? (vs sphinx, xapian)

    - by Eric
    I am studying fulltext search engines for django. It must be simple to install, fast indexing, fast index update, not blocking while indexing, fast search. After reading many web pages, I put in short list : Mysql MYISAM fulltext, djapian/python-xapian, and django-sphinx I did not choose lucene because it seems complex, nor haystack as it has less features than djapian/django-sphinx (like fields weighting). Then I made some benchmarks, to do so, I collected many free books on the net to generate a database table with 1 485 000 records (id,title,body), each record is about 600 bytes long. From the database, I also generated a list of 100 000 existing words and shuffled them to create a search list. For the tests, I made 2 runs on my laptop (4Go RAM, Dual core 2.0Ghz): the first one, just after a server reboot to clear all caches, the second is done juste after in order to test how good are cached results. Here are the "home made" benchmark results : 1485000 records with Title (150 bytes) and body (450 bytes) Mysql 5.0.75/Ubuntu 9.04 Fulltext : ========================================================================== Full indexing : 7m14.146s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:11.553524 next run : 0:00:00.168508 Mysql 5.5.4 m3/Ubuntu 9.04 Fulltext : ========================================================================== Full indexing : 6m08.154s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:11.553524 next run : 0:00:00.168508 1 thread, 100000 searchs with single word randomly taken from database : First run : 9m09s next run : 5m38s 1 thread, 10000 random strings (random strings should not be found in database) : just after the 100000 search test : 0:00:15.007353 1 thread, boolean search : 1000 x (+word1 +word2) First run : 0:00:21.205404 next run : 0:00:00.145098 Djapian Fulltext : ========================================================================== Full indexing : 84m7.601s 1 thread, 1000 searchs with single word randomly taken from database with prefetch : First run : 0:02:28.085680 next run : 0:00:14.300236 python-xapian Fulltext : ========================================================================== 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:26.402084 next run : 0:00:00.695092 django-sphinx Fulltext : ========================================================================== Full indexing : 1m25.957s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:30.073001 next run : 0:00:05.203294 1 thread, 100000 searchs with single word randomly taken from database : First run : 12m48s next run : 9m45s 1 thread, 10000 random strings (random strings should not be found in database) : just after the 100000 search test : 0:00:23.535319 1 thread, boolean search : 1000 x (word1 word2) First run : 0:00:20.856486 next run : 0:00:03.005416 As you can see, Mysql is not so bad at all for fulltext search. In addition, its query cache is very efficient. Mysql seems to me a good choice as there is nothing to install (I need just to write a small script to synchronize an Innodb production table to a MyISAM search table) and as I do not really need advanced search feature like stemming etc... Here is the question : What do you think about Mysql fulltext search engine vs sphinx and xapian ?

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  • MySQL differences between to select queries

    - by bpmccain
    I have two mysql queries that return a column of phone numbers. I want am trying to end up with a list of phone numbers that are in one list, but not in the other. So the two queries I have are: SELECT phone FROM civicrm_phone phone LEFT JOIN civicrm_participant participant ON phone.contact_id = participant.contact_id WHERE phone.is_primary = 1 AND participant.id IS NULL and SELECT phone FROM civicrm_phone phone LEFT JOIN civicrm_participant participant ON phone.contact_id = participant.contact_id WHERE phone.is_primary = 1 AND participant.id IS NOT NULL And before anyone asks, the above two queries do not provide mutually exclusive results (based on using IS NULL and IS NOT NULL for the last WHERE statement), since we have related individuals in the database who use the same phone number, but do not necessarily all have a participant.id. Thanks for any help.

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  • How to Run a batch file in a Remote machine Using ANT??

    - by ragz
    I want to run a batch file in a remote machine using ANT. The purpose of this is it solves many tasks once it's done. Some of them are we can resart a server(Jboss,weblogic,Tomcat,etc) we can run an ant script in a remote machine ...and so on. With all those commands present in the batch file of a remote machine, this could be executed easily. Is there a way to achieve to achieve this, please and kindly if any one do know provide a reply with example code I hope the answer to this question perhaps useful for many people Thanks in advance StackOverflow

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  • ruby-debug19: Can't get working with Ruby 1.9.1p376

    - by tk-421
    Hello, I'm trying to use ruby-debug19 with Ruby 1.9.1p376 but am getting the following error: test.rb:2:in `require': no such file to load -- ruby-debug19 (LoadError) from test.rb:2:in `<main>' Here's test.rb: require 'rubygems' require 'ruby-debug19' Here's the output of "gem list": *** LOCAL GEMS *** ruby-debug19 (0.11.6) (etc.) So running "ruby test.rb" generates the above error. Am I doing this wrong? I thought this was the correct way to run ruby-debug19 (by including the gem and adding "debugger" statements) and haven't been able to find any articles/posts with the same problem. I am using RVM but the above output is all under the same version of Ruby ("ruby -v" shows 1.9.1p376 as expected, and the gem list output is specific to that version and not the OS X system-installed version 1.8.7).

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  • How to style alternating rows in asp.net mvc

    - by YeahStu
    I am using a <% foreach ...% loop to list a collection of items on my website. I want to add a different background color for the style of alternating rows in my list. I have found a way to do this but I am not satisfied with it as it seems like a hack. Here is what I have done to solve it so far: <table> <% int counter = 0; foreach (var item in Model) { counter++; if (counter % 2 == 0) { %> <tr class="colorfull"> <% } else { %> <tr> <% } %> ... Is there a best practice that I am missing that people are using for this scenario in ASP.NET MVC?

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  • Chinese encoding issue while listing files

    - by Null Pointer
    I am running a Java application on a Solaris10 with Chinese. Now there are some files in a directory with chinese filenames. When I do files = new File(dir).list() where "dir" is the parent directory containing that chinese file, I get the result filename files[0] as ?????(some junk characters). Now the deal is that my programs file.encoding property is already set to GBK and I also do Charset.isSupported("GBK") and it returns true too. So where could be the problem. I am running out of ideas. NOTE: I am not trying to print the filename anywhere or copy the file or something. I am simply openeing a stream to it, something like below: files = new File(dir).list(); new FileInputStream(files[0]); Now this gives me a FileNotFoundExcpetion, so I debug just to find that value inside files[0] is "??????".

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  • Undefined Results in jQuery Autocomplete

    - by CreativeNotice
    So I've got the latest versions of jQuery and UI running. I'm using the basic autocomplete invocation and returning valid JSON (validated via JSONLint). $("input#cust_id").autocomplete({ source: yoda.app.base + "/assets/cfc/util/autocomplete.cfc?method=cust", minLength: 2, select: function(event, ui) { log(ui.item ? ("Selected: " + ui.item.value + " aka " + ui.item.id) : "Nothing selected, input was " + this.value); } }); Both the value and label elements of the returned array show up in the list as undefined. I can watch the results returned via Firebug and the JSON is correct there as well. Also, while the list only says "undefined" it does say that the same number of times as records returned in JSON. [{"VALUE":"custid1","LABEL":"My Customer Name 1"},{"VALUE":"custname2","LABEL":"My customer name 2"}]

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  • Python "Every Other Element" Idiom

    - by Matt Luongo
    Hey guys, I feel like I spend a lot of time writing code in Python, but not enough time creating Pythonic code. Recently I ran into a funny little problem that I thought might have an easy, idiomatic solution. Paraphrasing the original, I needed to collect every sequential pair in a list. For example, given the list [1,2,3,4,5,6], I wanted to compute [(1,2),(3,4),(5,6)]. I came up with a quick solution at the time that looked like translated Java. Revisiting the question, the best I could do was l = [1,2,3,4,5,6] [(l[2*x],l[2*x+1]) for x in range(len(l)/2)] which has the side effect of tossing out the last number in the case that the length isn't even. Is there a more idiomatic approach that I'm missing, or is this the best I'm going to get?

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  • SPGridView current item in Sharepoint

    - by pistacchio
    Hi, I'm making a custom webpart. I takes some items from a list and display them with a SPGridView. I bound the fields like this: // Grab data from a SP List into dvwTickets SPGridView grdMyTickets = new SPGridView(); grdMyTickets.DataSource = dvwTickets; [..] BoundField colTicketTypology = new BoundField(); colTicketTypology.DataField = "ID"; colTicketTypology.HeaderText = ticketList.Fields.GetFieldByInternalName("ID").Title; grdMyTickets.Columns.Add(colTicketTypology); [..] This works. Now, what a grid does behind the scene when binding data to it is cycling through the binded data. How can I access the "Current Item" to make operations on each item while binding? Thanks

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  • BlackBerry SDK 5.0 Issue

    - by Benoy Bose
    I developed a Hello World application using Black Berry Eclipse plug-in. When I rant it on any BlackBerry simulator of which platform version is greater than or equal to 5.0 then the Hello World application is not found listed in the default application list. However, I can run the application from Options Application : Search (Thridparty) and switch application. How can I make my application come to the default application list on any BlackBerry simulator with platform version is 5.0 or greater. My Hello World application is built for the JRE BlackBerry JRE 5.0.0 Can any one help.... Thanks, Benoy Bose

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  • CSS Horizontal sub-menu

    - by Develman
    Hello, I am working on a horizontal CSS dropdown menu. It is still working nearly fine for IE 7, IE 8 , Firefox and Chrome. But I want to make the top <ul> to be on top level (e.g. z-index: 100). I want this because the top level <ul> has a graphical background and the dropdown is just styled with css and in the current way it is destroying the layout. HTML Code: <div id="mainMenu"> <ul> <li><a href="t1">TOP1<!--[if gt IE 6]><!--></a><!--<![endif]--> <!--[if lte IE 6]><table><tr><td><![endif]--> <ul> <li><a href="l1">LINK1</a></li> <li><a href="l2">LINK2</a></li> <li><a href="l3">LINK3</a></li> <li><a href="l4">LINK4</a></li> </ul> <!--[if lte IE 6]></td></tr></table></a><![endif]--> </li> <li class="center"><a href="t2">TOP2<!--[if gt IE 6]><!--></a><!--<![endif]--> <!--[if lte IE 6]><table><tr><td></td></tr></table></a><![endif]--></li> <li><a name="t3">TOP3<!--[if gt IE 6]><!--></a><!--<![endif]--> <!--[if lte IE 6]><table><tr><td><![endif]--> <ul class="last"> <li><a href="l5">LINK5</a></li> <li><a href="l6">LINK6</a></li> <li><a href="l7">LINK7</a></li> </ul> <!--[if lte IE 6]></td></tr></table></a><![endif]--> </li> </ul> </div> CSS Code /* style the outer div to give it width */ #mainMenu { position: absolute; margin-left: 6px; margin-top: 180px; } /* remove all the bullets, borders and padding from the default list styling */ #mainMenu ul { position: absolute; width: 494px; padding: 0; margin: 0; list-style-type: none; background: #FFF url(../images/mainMenu_bg.gif) no-repeat; } /* float the list to make it horizontal and a relative positon so that you can control the dropdown menu positon */ #mainMenu li { position: relative; float: left; padding-left: 5px; width: 160px; vertical-align: middle; text-align: left; } #mainMenu li.center { padding-left: 0px; text-align: center; } /* style the links for the top level */ #mainMenu a, #mainMenu a:visited { display: block; font: bold 12px/1em Helvetica, arial, sans-serif; color: #FFF; text-decoration: none; height: 42px; line-height: 35px; } /* hide the sub levels and give them a positon absolute so that they take up no room */ #mainMenu ul ul { visibility: hidden; position: absolute; height: 0; top: 35px; left: -5px; width: 165px; } /* style the table so that it takes no part in the layout - required for IE to work */ #mainMenu table { position: absolute; top: 0; left: 0; } /* style the second level links */ #mainMenu ul ul a, #mainMenu ul ul a:visited { width: 165px; height: 20px; line-height: 19px; font: bold 10px Helvetica, arial, sans-serif; background: #EF7D0E; color: #FFF; text-align: left; padding: 6px 0 0 5px; border-top: 1px solid #C1650B; } #mainMenu ul ul.last a, #mainMenu ul ul.last a:visited { width: 162px; } /* style the top level hover */ #mainMenu a:hover, #mainMenu ul ul a:hover{ color: #FFF; text-decoration: underline; } #mainMenu :hover > a, #mainMenu ul ul :hover > a { color: #FFF; text-decoration: underline; } /* make the second level visible when hover on first level list OR link */ #mainMenu ul li:hover ul, #mainMenu ul a:hover ul{ visibility: visible; } I have still a problem with showing the table in IE 6 but my main problem here is to show the LINK1...6 under the TOP links. I have tried many settings with z-index but nothing worked here. I hope you can help me ;)

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  • CSS Attribute Content Selector multiple declarations

    - by Dave
    I have this in my CSS: div#headwrap ul li a[href*="dev"] {background: #034769}; div#headwrap ul li a[href*="music"] {background: #A61300}; div#headwrap ul li a[href*="opinion"] {background: #b2d81e}; div#headwrap ul li a[href*="work"] {background: #ffc340}; So, my expected behavior is that where a link (a) within a list item (li) inside a unordered list (ul) inside a div with id "headwrap" has an href that contains "dev", the link will have a background color of #034769. If the link has an href that contains "music" it will have a background color of #A61300, and so on. However, what I am seeing is that the rule is only correctly applied to "dev". If I reorder the CSS declarations (putting music first, for instance), it only gets applied to "music". I'm testing in Firefox and Chrome, both are doing the same thing. Only the first one is applied. Anyone have any ideas why?

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  • Adding a sortcomparefunction to Dynamic Data Grid in flex

    - by Tom
    Hi, I am trying to create a dynamic datagrid in Flex 3, I have a list of columns a list of objects which correspond to datapoints for those columns which I fetch from a url. While the grid works perfectly fine the problem is that sorting on the columns is done in lexical order. I am aware that this can be fixed by adding a sortcomparefunction to a column, which is not easy for this case. I have tried doing var dgc:DataGridColumn = new DataGridColumn(dtf); f1[dtf] = function(obj1:Object, obj2:Object):int { return Comparators.sortNumeric(obj1[dtf],obj2[dtf]); }; dgc.sortCompareFunction = f1[dtf];` But the problem is that the function object that I am creating here is being overwritten in every iteration (as I am adding columns) and eventually all the columns will have sorting done only on the last column added. Suggestions please.

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  • Scheme early "short circuit return"?

    - by Suan
    I'm trying to find out how I can do an "early return" in a scheme procedure without using a top-level if or cond like construct. (define (win b) (let* ((test (first (first b))) (result (every (lambda (i) (= (list-ref (list-ref b i) i) test)) (enumerate (length b))))) (when (and (not (= test 0)) result) test)) 0) For example, in the code above, I want win to return test if the when condition is met, otherwise return 0. However, what happens is that the procedure will always return 0, regardless of the result of the when condition. The reason I am structuring my code this way is because in this procedure I need to do numerous complex checks (multiple blocks similar to the let* in the example) and putting everything in a big cond would be very unwieldy.

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  • Rich Tooltip for SelectItem, error when including EL in "for" attribute

    - by pakore
    How to attach a rich:tooltip to the list generated by f:selectItems when using a variable for the attribute for inside the rich:tooltip. This code works fine (the value of #{prefix} is theprefixvalue <ui:composition> <a4j:form id="#{prefix}_form"> <h:selectOneRadio style="text-align:left" id="#{prefix}_rating"> <f:selectItems value="#{test.options}"></f:selectItems> </h:selectOneRadio>&nbsp; <rich:toolTip for="theprefixvalue_form\:theprefixvalue_rating\:0">a</rich:toolTip> </a4j:form> </ui:composition> But this code does not: <ui:composition> <h:outputText value="#{prefix}" /> <a4j:form id="#{prefix}_form"> <h:selectOneRadio style="text-align:left" id="#{prefix}_rating"> <f:selectItems value="#{test.options}"></f:selectItems> </h:selectOneRadio>&nbsp; <rich:toolTip for="#{prefix}_form\:#{prefix}_rating\:0">a</rich:toolTip> </a4j:form> </ui:composition> Throws the following exception: Caused by: java.lang.IllegalArgumentException: theprefixvalue_rating at javax.faces.component.UIComponentBase.findComponent(UIComponentBase.java:612) at org.ajax4jsf.renderkit.RendererUtils.findComponentFor(RendererUtils.java:1037) at org.richfaces.renderkit.html.ToolTipRenderer.getTargetId(ToolTipRenderer.java:234) at org.richfaces.renderkit.html.ToolTipRenderer.constructJSVariable(ToolTipRenderer.java:251) ... TestBean is session scoped and this is the code for getOptions(); public List<SelectItem> getOptions(){ List<SelectItem> options = new ArrayList<SelectItem>(); options.add(new SelectItem("a","a")); options.add(new SelectItem("b","b")); options.add(new SelectItem("c","c")); return options; } Any ideas? The goal is to have a tooltip when the mouse is over the different options. Thanks in advance.

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  • Is there built-in method to tell if specific URL belongs to this SPWeb or other SPWeb?

    - by Janis Veinbergs
    Hello. I have a list of urls (content type usage url's). Now, content types are deployed across web's. I need to loop those content types and do some actions in each list, but opening new SPWeb instance every loop is too resource intensive. Is there built-in method to tell me if this URL belongs to certain SPWeb object? Example: SPWeb's may be http://server/web1 http://server/web2 http://server/web2/subweb1 http://server/web2/subweb2 With content type usage links like: /web2/Pages /web2/Lists/Tasks /web2/Lists/Documents /web2/subweb1/Lists/Tasks ... As you can see, for first 3 usages i don't need to open up new SPWeb

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  • ctypes and PySide

    - by Timothy Baldridge
    I'm building an app with PySide, there's some image manipulation that needs to be done and using Python code for this is way too slow. Therefore I hacked out a .dll file that will do it for me. The function definition is as follows: extern "C" { QRectF get_image_slant(QImage *img, float slantangle, float offset) { Now I can load this function in via ctypes. But I can't seem to get ctypes to accept a QImage. I tried calling it like this: ext.get_image_slant(QImage(), 0, 0) And the reply I get is: File "<stdin>", line 1, in <module> ctypes.ArgumentError: argument 1: <type 'exceptions.TypeError'>: Don't know how to convert parameter 1 I tired casting the QImage to a c_void_p and it doesn't like that either. From what I can tell QImage() in python should map exactly to a QImage * in C, but Python doesn't seem to understand that.. Is there any way to force the casting?

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  • .NET MVC Ajax Form - How do you hide it?

    - by Tommy
    Ok, everything is 'functionally' working with what I am attempting to accomplish and once again, I am sure this is something dumb, but I cannot figure out how to do this one thing. I have an edit form for an entity, lets say a car. This 'car' can have 0 - many passengers. So on my edit form, I have all the fields for the car, then a list view showing each passenger (partial). I also have a 'add new passenger' button that will render a new partial view that allows you to enter a passenger. This has a cancel link and an add button to submit an Ajax form. When you add a passenger, the passenger is automatically added to the list, but I need the enter passenger form to go away. I have tried using the onSuccess and onComplete functions to hide the div that the form is in, but both render just the partial view HTML elements (white screen, text) and not the partialView in the context of the entire page. Sources: 1) Main Edit View <script type="text/javascript"> Function hideForm(){ document.getElementById('newPassenger').style.display = 'none'; } </script> <h2>Edit</h2> <%-- The following line works around an ASP.NET compiler warning --%> <%= ""%> <%Html.RenderPartial("EditCar", Model)%> <h2>Passengers for this car</h2> <%=Ajax.ActionLink("Add New Passenger", "AddPassenger", New With {.ID = Model.carID}, New AjaxOptions With {.UpdateTargetId = "newPassenger", .InsertionMode = InsertionMode.Replace})%> <div id="newPassenger"></div> <div id="passengerList"> <%Html.RenderPartial("passengerList", Model.Passengers)%> </div> <div> <%= Html.ActionLink("Back to List", "Index") %> </div> 2) AddPassenger View. The cancel link below is an action that returns nothing, thus removing the information in the div. <% Using Ajax.BeginForm("AddPassengerToCar", New With {.id = ViewData("carID")}, New AjaxOptions With {.UpdateTargetId = "passengerList", .InsertionMode = InsertionMode.Replace})%> <%=Html.DropDownList("Passengers")%> <input type="submit" value="Add" /> <%=Ajax.ActionLink("Cancel", "CancelAddControl", _ New AjaxOptions With {.UpdateTargetId = "newPassenger", .InsertionMode = InsertionMode.Replace})%><% end using %>

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  • Need help manipulating WAV (RIFF) Files at a byte level

    - by Eric
    I'm writing an an application in C# that will record audio files (*.wav) and automatically tag and name them. Wave files are RIFF files (like AVI) which can contain meta data chunks in addition to the waveform data chunks. So now I'm trying to figure out how to read and write the RIFF meta data to and from recorded wave files. I'm using NAudio for recording the files, and asked on their forums as well on SO for way to read and write RIFF tags. While I received a number of good answers, none of the solutions allowed for reading and writing RIFF chunks as easily as I would like. But more importantly I have very little experience dealing with files at a byte level, and think this could be a good opportunity to learn. So now I want to try writing my own class(es) that can read in a RIFF file and allow meta data to be read, and written from the file. I've used streams in C#, but always with the entire stream at once. So now I'm little lost that I have to consider a file byte by byte. Specifically how would I go about removing or inserting bytes to and from the middle of a file? I've tried reading a file through a FileStream into a byte array (byte[]) as shown in the code below. System.IO.FileStream waveFileStream = System.IO.File.OpenRead(@"C:\sound.wav"); byte[] waveBytes = new byte[waveFileStream.Length]; waveFileStream.Read(waveBytes, 0, waveBytes.Length); And I could see through the Visual Studio debugger that the first four byte are the RIFF header of the file. But arrays are a pain to deal with when performing actions that change their size like inserting or removing values. So I was thinking I could then to the byte[] into a List like this. List<byte> list = waveBytes.ToList<byte>(); Which would make any manipulation of the file byte by byte a whole lot easier, but I'm worried I might be missing something like a class in the System.IO name-space that would make all this even easier. Am I on the right track, or is there a better way to do this? I should also mention that I'm not hugely concerned with performance, and would prefer not to deal with pointers or unsafe code blocks like this guy. If it helps at all here is a good article on the RIFF/WAV file format.

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