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• Frustrated with Objective-c code...

  - by Moshe

  Well, I've started with iPod/iPhone programming using Head First iPhone Development (O'reilly) and I'm typing code out of the book. There are two problems, one is programming related and the other is not. I don't understand the format of objective-c methods. I'm getting an few errors now, based on source code from the book. Which leads me to my next issue. Some of the code is buggy. I think so because I couldn't get the code to run without modifying it. The book has some typos in the text since it's a first edition and whatnot, but could my "fixing" the code have to do with it? So... Where can I learn more about objective-c methods and how they work in terms of structure and where the return type and arguments go? For those with the book, I'm in the middle of the InstaTweet app towards the beginning. Thanks.

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• Getting ID of an instance newly launched with ec2-api-tools

  - by Jonik

  I'm launching an EC2 instance, by invoking ec2-run-instances from simple a bash script, and want to perform further operations on that instance (e.g. associate elastic IP), for which I need the instance id. The command is something like ec2-run-instances ami-dd8ea5a9 -K pk.pem -C cert.pem --region eu-west-1 -t c1.medium -n 1, and its output: RESERVATION r-b6ea58c1 696664755663 default INSTANCE i-945af9e3 ami-dd8ea5b9 pending 0 c1.medium 2010-04-15T10:47:56+0000 eu-west-1a aki-b02a01c4 ari-39c2e94d In this example, i-945af9e3 is the id I'm after. So, I'd need a simple way to parse the id from what the command returns - how would you go about doing it? My AWK is a little rusty... Feel free to use any tool available on a typical Linux box. (If there's a way to get it directly using EC2-API-tools, all the better. But afaik there's no EC2 command to e.g. return the id of the most recently launched instance.)

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• Ruby on Rails - nested attributes: How do I access the parent model from child model

  - by TMaYaD

  I have a couple of models like so class Bill < ActiveRecord::Base has_many :bill_items belongs_to :store accepts_nested_attributes_for :bill_items end class BillItem <ActiveRecord::Base belongs_to :product belongs_to :bill validate :has_enough_stock def has_enough_stock stock_available = Inventory.product_is(self.product).store_is(self.bill.store).one.quantity errors.add(:quantity, "only #{stock_available} is available") if stock_available < self.quantity end end The above validation so obviously doesn't work because when I'm reading the bill_items from nested attributes inside the bill form, the attributes bill_item.bill_id or bill_item.bill are not available before being saved. So how do I go about doing something like that?

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• compare a string and trim in vb.net

  - by referr

  I have this string that shall come in from another file. The string has maximum length of 102 digits. I need to compare the string with numbers in a pair and delete those form that string. e.g - 6125223659587412563265... till 102 numbers that compare with this string- first set - 61 new string = 25223659587412563265 second set - 36 new string = 252259587412563265 and so on. the set of numbers shall go to maximum of 51 pairs = 102, which shall give an end result of string = "" How can i achieve this in a loop?

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• Operand size conflict in x86 Assembly??

  - by Mark V.

  I'm a novice programmer who is attempting assembly for the first time. Sorry in advance if this is an incredibly lame question. I have a character stored in the EAX register, but I need to move it to my DL register. When I try: mov dl, eax I get an error C2443: operand size conflict. I know that the eax register is 32 bit while the dl is 8 bit... am I on to something?? How do I go about solving this.

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• Calling AS3 function from html link - Javascript? php? swfaddress?

  - by wdense51

  I have an actionscript function that loads an external swf and is currently linked to a button in the same swf... function btnClick(event:MouseEvent):void{ SoundMixer.stopAll(); removeChild(loader); loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onSWFLoaded); loader.load(movieSWF) loader.x=Xpos loader.y=Ypos addChild(loader) } button.addEventListener(MouseEvent.CLICK,btnClick); I'm wondering if there is a way to call this function from a link on the page that the swf is housed on. I'm guessing javascript, php or swfaddress would be the most likely way, but I'm unbelievably new to all this so I'm not sure where to start or how to go about it. Any help would be appreciated.

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• TFS and working with multiple solutions

  - by RandomEngy

  How do people generally deal with TFS when you've got to work with multiple solution files? If you've got one instance it's easy because you can always go to that window for the source control explorer, pending changes, check on builds or work items. But when you have 4-5 solutions, it becomes tricky to deal with. You might expand some folders or check some pending items on one VS instance but you have to remember which one you did it on. Having a separate instance dedicated just to TFS tasks is tempting, but there's only one window state for the whole program. If that instance is closed last, all instances will come up with all the TFS windows open. How do other people deal with this? Can you use separate profiles somehow and cordon off a "TFS" instance of Visual Studio?

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• Creating a multiplayer card game

  - by Vikram.exe

  Hi, I was trying to make a multiplayer card game. I know networking concepts, so I know how to handle data between successive turns. I Haven't done a similar thing before so if any one could point me to a tutorial, that would be nice. I am comfortable with html/php/javascript and a bit of adobe flash. Please suggest are these sufficient to create a game or should I go for some other language(s)? Which are the best languages that are currently used to create such multiplayer games? Thanks, Vikram

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• MVVM User Control Issue

  - by Burt

  I have a problem with commands in an MVVM application (I am only learning MVVM so go easy). MyClassViewModel is set to the datacontext for MainForm1, MyList is bound to UserControl1 datacontext and each item in the list is represented by UserControl2. I am trying to fire MyCommand in UserControl2 using the following: <CheckBox IsChecked="{Binding MyBool}" Command="{Binding Path=MyCommand}" CommandParameter="{Binding}"> I get the following error in the output: System.Windows.Data Error: 39 : BindingExpression path error: 'MyCommand' property not found on 'object' ''MyObject'' From this error I know that WPF is looking for the command in the object bound to the UserControl2 what I really need is for it to look for the command in the MainForm1 datacontext (MyClassViewModel). Is it possible to bubble up commands like this and if so how is it done? Is bubbling up the command a good solution?

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• best way to parse plain text file with a nested information structure

  - by Beffa

  The text file has hundreds of these entries (format is MT940 bank statement) {1:F01AHHBCH110XXX0000000000}{2:I940X N2}{3:{108:XBS/091502}}{4: :20:XBS/091202/0001 :25:5887/507004-50 :28C:140/1 :60F:C0914CHF7789, :61:0912021202D36,80NTRFNONREF//0887-1202-29-941 04392579-0 LUTHY + xxx, ZUR :86:6034?60LUTHY + xxxx, ZUR vom 01.12.09 um 16:28 Karten-Nr. 2232 2579-0 :62F:C091202CHF52,2 :64:C091302CHF52,2 -} This should go into an Array of Hashes like [{"1"=>"F01AHHBCH110XXX0000000000"}, "2"=>"I940X N2", 3 => {108=>"XBS/091502"} etc. } ] I tried it with tree top, but it seemed not to be the right way, because it's more for something you want to do calculations on, and I just want the information. grammar Mt940 rule document part1:string spaces [:|/] spaces part2:document { def eval(env={}) return part1.eval, part2.eval end } / string / '{' spaces document spaces '}' spaces { def eval(env={}) return [document.eval] end } end end I also tried with a regular expression matches = str.scan(/\A[{]?([0-9]+)[:]?([^}]*)[}]?\Z/i) but it's difficult with recursion ... How can I solve this problem?

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• How "healthy" is the haskell community

  - by Asher

  I came across a post where someone wrote something inaccurate about haskell (won't go into it) and he got flammed for it. Which (pleasantly) surprised me. About 3 years ago I read this joke about haskell: All the haskell programmers in the world can fit into a 747 and if that plane were to crash no one would care... or something along those lines. Which brings me to my question: is haskell "mainstream"? Is it mainly used by hobbiest and academics or someone making some serious money from it (which is the true yardstick of how good a language is - just kidding, geez!)?

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• Storing index values in FAST-ESP without modifications

  - by Abel Morelos

  Hi, first of all I'm totally new to FAST but I already have a couple of issues I need to solve, so I'm sorry if my questions are very basic =) Well, the problem is that I have a field in the FAST index which in the source document is something like "ABC 12345" (please note the intentional whitespaces) but when stored in the index is in the form "ABC 123456" (please note that now there is a single space). If I retrieve all the document values then this specific value is OK (with all the whitespaces), my only problem is with the way the value is stored in the index since I need to retrieve and display it to my user just like it appears in the original document, and I don't want to go to the full document just for this value, I want the value that I already have in the index. I think I need to update one of the FAST XML configuration files but I don't have enough documentation at hand in order to decide where to perform the change, index_profile.xml? in the XMLMapper file?

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• Curser control using Masked Text Box in C#

  - by George

  I seem to have asked this question twice ! I kept getting a message saying New Members can only add a new Question every 20 minutes, try again later !!! Sorry for the duplication ! Please ignore this one !! Thanks. In my app in C# I have several input fields that I need to capture. I need them to be of specific sizes and type and I have used masked Text Boxes for these. I have fields like name which is 20 text charachters long, and a certificate number which is 5 numeric characters with a preceding C etc. This works fine except with I click on a field with the mouse, the cursor does not go to the begining of the fild, or the end of any input text. Is there a way of allowing this to happen using Masked Text Box or will I have to use normal Text Box and do all the field validation manually ?

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• Filtering model results for Django admin select box

  - by blcArmadillo

  I just started playing with Django today and so far am finding it rather difficult to do simple things. What I'm struggling with right now is filtering a list of status types. The StatusTypes model is: class StatusTypes(models.Model): status = models.CharField(max_length=50) type = models.IntegerField() def __unicode__(self): return self.status class Meta: db_table = u'status_types' In one admin page I need all the results where type = 0 and in another I'll need all the results where type = 1 so I can't just limit it from within the model. How would I go about doing this?

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• Visualizing an AST created with ANTLR (in a .Net environment)

  - by Benjamin Podszun

  Hi there. For a pet project I started to fiddle with ANTLR. After following some tutorials I'm now trying to create the grammar for my very own language and to generate an AST. For now I'm messing around in ANTLRWorks mostly, but now that I have validated that the parse tree seems to be fine I'd like to (iteratively, because I'm still learning and still need to make some decisions regarding the final structure of the tree) create the AST. It seems that antlrworks won't visualize it (or at least not using the "Interpreter" feature, Debug's not working on any of my machines). Bottom line: Is the only way to visualize the AST the manual way, traversing/showing it or printing the tree in string representation to a console? What I'm looking for is a simple way to go from input, grammar - visual AST representation a la the "Interpreter" feature of ANTLRWorks. Any ideas?

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• Java sound doesn't work under Linux

  - by Cliff

  Help! I'm getting frustrated by the individual hoops I have to go through to eek sound out of my speakers when running Java apps on Linux platforms! I just installed Fedora 12 and after downloading and running the Java Sound Demo I get exceptions. If I run just a vanilla Java program that plays a wav file it runs silently with no sound and no exceptions. Every other app seems to play sound. I also took some advice from this thread in the Ubuntu forums which almost seemed to work. (Installing aoss got rid of the initial exceptions in the sound demo but I still hear nothing when I play.) can somebody help me figure out what's wrong?

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• compiling actionscript from command line using MXMLC

  - by I. J. Kennedy

  I have a tiny actionscript "project" consisting of two files, call them foo.as and bar.as. For reasons I won't go into, I really really want to build the .SWF from the command line, without setting up a formal project of any kind. Every compiler I've ever used lets you do this, but for the life of me I can't figure out how to coerce MXMLC into compiling these two files and linking them into a SWF. Naively, I try MXMLC foo.as bar.as but I'm informed that only one source file is allowed. Ok, supposing I compiled these two files separately, how would I link them together to get the final SWF? NOTE: The only reason I have two files instead of one is the requirement of only one class per file. I tried putting both classes in one file and making one of the classes "private" or "internal" but neither of these ideas worked. I would be ecstatic to find out I can put more than one class in a file (with only one being public).

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• Why does forward declaration not work with classes?

  - by eSKay

  int main() { B bb; //does not compile (neither does class B bb;) C cc; //does not compile struct t tt; //compiles class B {}; struct s { struct t * pt; }; //compiles struct t { struct s * ps; }; return 0; } class C {}; I just modified the example given here. Why is that the struct forward declarations work but not the class forward declarations? Does it have something to do with the namespaces - tag namespace and typedef namespace? I know that the structure definitions without typedefs go to tag namespace. Structures are just classes with all public members. So, I expect them to behave similarly.

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• Why does localization with resx files fail with ZH (chinese) only?

  - by Trey Carroll

  Howdy All, I've been tasked with localizing an English language ASP.NET MVC 2.0 website into 7 additional languages. I've added resource files to the Views Home App_LocalResources folder: Example: Index.resx, Index.es.resx, Index.fr.resx, Index.zh.resx, etc. I have set the CustomTool to PublicResXFileCodeGenerator (Access modifier is Public), Set file as an Embedded Resource, Set a Custom Tool Namespace. The keys ("Name") in all of the files are the same. For 7 languages this works perfectly. If I go into IE 8 settings and change the language to de,fr,it, etc., the page shows the appropriate translated strings. However, when I set the language in the Browser to any of the zh (Simplified Chinese) variants localization completely fails and the English strings are displayed. Is there something special about Simplified Chinese? Japanese and Korean work without problems. TIA, Trey Carroll

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• Stack memory in Android

  - by Matt

  I'm writing an app that has a foreground service, content provider, and a Activity front end that binds to the service and gets back a List of objects using AIDL. The service does work and updates a database. If I leave the activity open for 4-8+ hours, and go to the "Running Services" section under settings on the phone (Nexus One) an unusually large amount of memory being used is shown (~42MB). I figure there is a leak. When I check the heap memory i get Heap size:~18MB, ~2MB allocated, ~16MB free. Analyzing the hprof in Eclipse MAT seems fine, which leads me to theorize that memory is leaking on the stack. Is this even possible? If it is, what can I do to stop or investigate the leak? Is the reported memory usage on the "Running Services" section of android even correct (I assume it is)? Another note: I have been unable to reproduce this issue when the UI is not up (with only the service running)

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• mod_rewrite to find missing /img/foo.jpg in /img/f/

  - by Ambrose

  I've got a folder of images which is reaching a critical mass after a few years. I want to move images into alphabetical folders, so that /img/foo.jpg goes into /img/f/foo.jpg and /img/bar.jpg goes into /img/b/bar.jpg and so on. In order to make the transition smooth, and to allow the manual uploaders to put stuff into the top level, I'd like to use mod_rewrite to do this: if /img/foo.jpg exists, serve it up, if not look for it in /img/f/foo.jpg thanks for any suggestions. For the record, no, I don't think we need to go /img/f/fo/foo.jpg just yet.

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• weird characters displayed during serial communication OSX

  - by nemo

  I have tried communicating via serial (OSX w/ prolific drivers - USB RS232 adapter - Tx,Rx and GND pins on device serial ttl port) to a device and done so successfully using screen /dev/tty.usbserial 115200 8N1 I get to log in and use it as if I was SSH or TelNetted in... However whenever I try to go into system recovery mode (holding CTRL+1) while the device is powering on, it starts displaying weird characters and until I close the screen session it will continue showing weird characters: Of course when we tried doing the same thing on my boss' macbook running windows and PuTTY and everything worked fine, even in system recovery mode; characters were displayed properly. What gives? Id like to learn the intuition to use because up till now I concluded that since I can bot into the system and see characters normally everything about the connection should be fine and its must have been the recovery partition that was broken. This was wrong of course... Niko

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• iOS 5 Hanging on ASIHTTPRequests

  - by Tareq

  So I have an app that runs on iOS 3.2 - 4.x. It uses ASIHTTPRequest to make all the REST API calls. Ever since my team and I upgraded three of our iPhone 4's to iOS 5, The app will hang and show the ActivityIndicator indefinitely. I looked at the server logs and the requests aren't hitting the server. However, if I press the iPhone home button then open the app again, the request will go through and I will receive the data, business as normal. For some reason the requests are never triggered until I reopen the app. Another weird tidbit, the app works in Xcode 4.2 and the iPhone simulator. The app also works on an iPad2 with iOS 5 (the app is iPhone only). Would this be an ASIHTTPRequest issue? Not too sure how to pinpoint the issue since there is no crash and only happens on the phone. Any insight would be much appreciated! Thanks.

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• Getting the Action during model binding

  - by Kieron

  Hi, Is there a way of getting the Action, and reading any attributes, during the model binding phase? The scenario is this: I've got a default model binder set-up for a certain data-type, but depending on how it's being used (which is controlled via an attribute on the action) I need to ignore a set of data. I can use the RouteData on the controller context and see the action name, which I can use to go get the data, but wondered if that information is already available. Additionally, if the action in question is an asynchronous one, they'd be more processing involved in looking it up...

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• why create "EventType clr20r3, P1 w3wp.exe" but don't have detail description of this unhandled exce

  - by Weixiao.Fan

  On the production server, I can see event from system Event Viewer when an asp.net app crash: *EventType clr20r3, P1 w3wp.exe, P2 6.0.3790.3959, P3 45d691cc, P4 app_web_default.aspx.cdcab7d2, P5 0.0.0.0, P6 4b2e4bf0, P7 4, P8 4, P9 system.dividebyzeroexception, P10 NIL.* it belongs to ".NET Runtime 2.0 Error Reporting" category. but I can't find a event which belongs to "ASP.NET 2.0.50727.0" which can give me this exception a detail view: *An unhandled exception occurred and the process was terminated. Application ID: /LM/W3SVC/505951206/Root Process ID: 1112 Exception: System.DivideByZeroException Message: Attempted to divide by zero. StackTrace: at _Default.Foo(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack) at System.Threading.ThreadPoolWaitCallback.PerformWaitCallback(Object state) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp I can find these two event on my dev machine, because of Visual Studio installing? If so, how can I disable this so I can emulate production environment? Great thanks and best regards, Fan

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