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• iPhone Simulator Error: dyld: Symbol not found: _objc_collect_if_needed

  - by freespace

  I have been seeing the following error message a lot whenever I run something in the simulator: dyld: Symbol not found: _objc_collect_if_needed Referenced from: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk/System/Library/Frameworks/Foundation.framework/Foundation Expected in: /usr/lib/libobjc.A.dylib in /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk/System/Library/Frameworks/Foundation.framework/Foundation I am running XCode 3.2.2 on OS X 10.6.3, and have reinstalled the SDK twice with no avail. This error makes running any code on the simulator something of a Russian Roulette, but with 5 out of 6 chambers loaded. I have checked the files mentioned in the error message, and they all checkout as being present. This sometimes go away if I restart XCode. Other times I have to logout, or even restart. And sometimes nothing works. I have googled this, even tried apple's developer forums. Other than a reference to this in the MonoTouch list, this bug appears to be completely unknown otherwise. Anything help would be greatly appreciated - this is a real PITA. Cheers, Steve

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• Testing file existence using NSURL

  - by Peter Hosey

  Snow Leopard introduced many new methods to use NSURL objects to refer to files, not pathnames or Core Services' FSRefs. However, there's one task I can't find a URL-based method for: Testing whether a file exists. I'm looking for a URL-based version of -[NSFileManager fileExistsAtPath:]. Like that method, it should return YES if the URL describes anything, whether it's a regular file, a directory, or anything else. I could attempt to look up various resource values, but none of them are explicitly guaranteed to not exist if the file doesn't, and some of them (e.g., NSURLEffectiveIconKey) could be costly if it does. I could just use NSFileManager's fileExistsAtPath:, but if there's a more modern method, I'd prefer to use that. Is there a simple method or function in Cocoa, CF, or Core Services that's guaranteed/documented to tell me whether a given file (or file-reference) URL refers to a file-system object that exists?

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• passing request params from jQuery to jersey service using json

  - by ccduga

  hi, im trying to POST (cross domain) some data to a jersey web service and retrieve a response (a GenericEntity object). The post successfully gets mapped to my jersey endpoint however when i pull the parameters from the request they are empty.. $ .ajax({ type: "POST", dataType: "application/json; charset=utf-8", url: jerseyNewUserUrl+'?jsoncallback=?', data:{'id':id, 'firstname':firstname,'lastname':lastname}, success: function(data, textStatus) { $('#jsonResult').html("some data: " + data.responseMsg); }, error: function ( XMLHttpRequest, textStatus, errorThrown){ alert('error'); } }); this is my jersey endpoint.. @POST @Produces( { "application/x-javascript", MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) @Path("/new") public JSONWithPadding addNewUser(@QueryParam("jsoncallback") @DefaultValue("empty") final String argJsonCallback, @QueryParam("id") final String argID, @QueryParam("firstname") final String argFirstName, @QueryParam("lastname") final String argLastName) is there something missing from my $.ajax call?

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• Why would a error get thrown inside my try-catch?

  - by George Johnston

  I'm pushing a copy of our application over to a new dev server (IIS7) and the application is blowing up on a line inside of a try-catch block. It doesn't happen locally, it actually obey's the rules of a try-catch block, go figure. Any idea why this would be happening? Shouldn't it just be failing silently? Is there something environmental I need to enable/disable? Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Line 229: Try Line 230: Here >> : _MemoryStream.Seek(6 * StartOffset, 0) Line 232: _MemoryStream.Read(_Buffer, 0, 6) Line 233: Catch ex As IOException End Try Although it doesn't matter for answering this question, I thought I would mention that it's third party code for the Geo IP lookup.

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• Automatic VM deployment

  - by Robert Wilson

  I have an idea to streamline deployments of prototypes within our team using VMs. The idea would be that a developer would be able to deploy their artifacts to Maven, then use a Web interface to pull them onto a development VM for integration/regression testing. They would then be able to to push those artifacts to a reference system, and finally onto production. I'm currently thinking of doing this myself using the vSphere Java API ( http://vijava.sourceforge.net/ ), and some simple scripting to grab artifacts from the Maven repository, configuration from SVN, and then start up a JBoss server. It feels like the kind of thing that may already be available though, has anyone heard of something similar?

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• PHP object parent/child recursion

  - by Damien

  I've got a parent-child OO relationship. Parent obejcts has many child objects and every child object knows about it's parent by reference. The parent can be a child too (basically its a tree). When i do a var_dump() on the root object it says ["parent"]=RECURSION many times and the generated description will be really long. I'm wondering if i do something wrong. If yes, i'm interested in the "best practice". Thanks for the help!

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• How to center an R plot after removing axis labels

  - by ConnorG

  I'm working on visualizing a matrix in R (almost exactly like http://reference.wolfram.com/mathematica/ref/MatrixPlot.html), and I've been using image(<matrix>,axes=FALSE) to draw the picture. However, I noticed that with the y-axis turned off, the plot isn't centered--the space is still there for the axis ticks + label. I can finagle some centering with par(oma=c(0,0,0,2.5)) but this seems inefficient and error-prone (if my matrix were to change dimensions/become non-square). Is there a better way to force the graphic to center? The right hand margin is significantly smaller than the left.

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• Generic WithEvents

  - by serhio

  Error: 'WithEvents' variables can only be typed as classes, interfaces or type parameters with class constraints Background: Public Class Tadpole(Of T As IVisibleChanged, P As IVisibleChanged) Private WithEvents _Tad As T ' ERROR ' Private WithEvents _Pole As P ' ERROR ' Public Property Tad() As T ... Public Property Pole() As P ... End Class ''' IVisibleChanged ''' Public Interface IVisibleChanged Property Visible() As Boolean Event VisibleChanged As EventHandler End Interface Workaround: a. Use AddHandler to handle events defined in a structure. EDIT b. use Private WithEvents _Tad AsIVisibleChanged (M.A. Hanin) c. ?

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• Flex ; get the value of RadioButton inside a FormItem

  - by numediaweb

  Hi, I'm working on Flash Builder with latest flex SDK. I have a problem getting the value radioButton of the selceted radio button inside a form: <mx:Form id="form_new_contribution"> <mx:FormItem label="Contribution type" includeIn="project_contributions"> <mx:RadioButtonGroup id="myG" enabled="true" /> <mx:RadioButton id="subtitle" label="subtitle" groupName="{myG}" value="subtitle"/> <mx:RadioButton id="note" label="notes / chapters" groupName="{myG}" value="note"/> </mx:FormItem> </mx:Form> the function is: protected function button_add_new_clickHandler(event:MouseEvent):void{ Alert.show(myG.selectedValue.toString()); } I tried also: Alert.show(myG.selection.toString()); bothe codes show error: TypeError: Error #1009: Cannot access a property or method of a null object reference. and if It only works if I put : Alert.show(myG.toString()); it alerts : Object RadioButtonGroup thanx for any hints, and sorry for the long message :)

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• How to return all aspnet_compiler errors (not just those in first directory)

  - by Dan Atkinson

  Hi there! Is there a way to get the aspnet_compiler to go through all views and return all errors, rather than just the errors in the current view directory? For example, lets say I have a project that has a bunch of folders... Views Folder1 Folder2 Folder3 Folder4 Two of them (Folder2 and Folder3) have errors. aspnet_compiler will run, and only return the errors it comes across in Folder2. It won't return those in Folder3 at the same time. Once I fix the errors in Folder2 and run it again, it'll then pick up the ones in the Folder3. I fix those. And then have to run the tool again, and again until it's all fixed. This is getting annoying!! For reference, here's the command I use: C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_compiler -v / -p "C:\path\to\project" Thanks in advance!

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• Question about tracking user in a map application using cellid

  - by subh

  I am trying to understand the concept of cellid (http://www.opencellid.org/api) As per that, if we send a request http://www.opencellid.org/cell/get?key=myapikey&mnc=1&mcc=2&lac=200&cellid=234 it will respond with the latitude and longitude. I was wondering if this can be used from within a google map application for tracking a user or it needs to be used from within a mobile device? If it can be used from within a web app, what parameters should it use for mcc: mobile country code (decimal) mnc: mobile network code (decimal) lac: locale area code (decimal) cellid: value of the cell id E.g., will it work if we know the cell number of the person(e.g., 281 222 6700)

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• Can I remove the labels from the bibliography, while keeping them in citations?

  - by Tae

  I'm writing the bibliography of my report with thebibliography environment because I don't need a BibTeX database (or I don't have the time for learn how to customize or write a style). Well, using the optional argument [label] I can specify as I want the cite references are show, for example: \bibitem[PNUD1996]{PNUD1996} PNUD. Desarrollo Humano en Chile 1996. Santiago: PNUD, 1996. So, if I write: in \cite{PNUD1996}. it produces: in [PNUD1996]. But the label also appear in the bibliography: [PNUD1996] PNUD. Desarrollo Humano en Chile 1996. Santiago: PNUD, 1996. Can I to remove the label from the bibliography and keeping it in the reference? I mean, to get: in [PNUD1996]. and PNUD. Desarrollo Humano en Chile 1996. Santiago: PNUD, 1996. Thanks, and sorry for my English :(

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• Invoke an action that is using ASP.NET MVC [Authorize] from outside the application

  - by Nate Bross

  Is this possible? I'd like to expose a URL (action) such as http://mysever/myapp/UpdateHeartbeat/. In my MVC application it looks like [Authorize] [AcceptsVerbs(HttpVerbs.Post)] public ActionResult UpdateHeartbeat() { // update date in DB to DateTime.Now } Now, in my MVC application the user has logged in via FORMS authentication and they can execute that action to their hearts content. What I want to do, is hit that URL progromatically (as part of an API that I wouldl like to build) -- is there a way I can do that without removing the [Authorize] attribute and adding username/password as parameters to the POST?

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• Xap file contents changes if built in Visual Studio or build server

  - by arch

  I'm using MEF with my Silverlight 4 app to dynamically load xap files. To optimize this process, I've removed various assemblies from my xaps since I know they've already been loaded by the base xap. This reduces the size of my dynamically loaded xaps. I accomplished this by setting the "Copy Local" flag for each assembly reference to "false". This all seems to work fine when I build in Visual Studio 2010 - my xaps are much smaller. However, when the same projects are built by the build server, all the excluded references are once again in the xap file hence tripling the size of the xap. I've read several blogs/articles regarding similar experiences but no resolution. Very frustrating - any help is appreciated.

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• How to set response header in JAX-RS so that user sees download popup for Excel?

  - by masato-san

  I wrote code that generate Excel file using REST JAX-RS and I confirmed that the generated Excel file is in GlassFish server directory. But my goal is when user click on the button (which generate Excel .xls), I want download popup to show up asking user whether to save or open the .xls file just like any other web services doing for downloading any type of files. According to my search, the step is: generate Excel .xls (DONE) write the excel to stream in JAX-RS file, set response header to something like, String fileName = "Blah_Report.xls"; response.setHeader("Content-Disposition", "attachment; filename=" + fileName); My question is I'm doing all of this in JAX-RS file and I don't have HttpServletResponse object available. According to the answer from Add Response Header to JAX-RS Webservice He says: You can inject a reference to the actual HttpServletResponse via the @Context annotation in your webservice and use addHeader() etc. to add your header. I can't really figure what exactly that means without sample code..

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• Line numbering in Visual Studio

  - by Cyclone

  Why doesn't VS have any sort of line numbering? Is there any way to enable it, or a plugin for it? I know, the number of lines of code in a program doesn't matter, but sometimes it is nice to know how long a program is, or what line number something is for reference. I can't seem to find that as an option anywhere, to my surprise. Thanks for the help! This is Visual Studio 2010 Ultimate. (if you have read my older questions, I've been using 2008 Express until now.)

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• Who interrupts my thread?

  - by Thirler

  I understand what an InterruptedException does and why it is thrown. However in my application I get it when waiting for SwingUtilities.invokeAndWait() on a thread that is only known by my application, and my application never class Thread.interrupt() on any thread, also it never passes the reference of the thread on to anyone. So my question is: Who interrupts my thread? Is there any way to tell? Is there a reason why the InterruptedException doesn't contain the name of the Thread that requests the interrupt? I read that it could be a framework or library that does this, we use the following, but I can't think of reason for them to interrupt my thread: Hibernate Spring Log4J Mysql connector

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• Removing a node from a linked list

  - by lost_with_coding

  I would like to create a delete_node function that deletes the node at the location in the list as a count from the first node. So far this is the code I have: class node: def __init__(self): self.data = None # contains the data self.next = None # contains the reference to the next node class linked_list: def __init__(self): self.cur_node = None def add_node(self, data): new_node = node() # create a new node new_node.data = data new_node.next = self.cur_node # link the new node to the 'previous' node. self.cur_node = new_node # set the current node to the new one. def list_print(self): node = ll.cur_node while node: print node.data node = node.next def delete_node(self,location): node = ll.cur_node count = 0 while count != location: node = node.next count+=1 delete node ll = linked_list() ll.add_node(1) ll.add_node(2) ll.add_node(3) ll.list_print()

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• Flex4 Application state in a custom component

  - by itarato

  Hi, I'm porting my Flex3 app to Flex4 (FlashBuilder4). I get the whole new state concept, except one thing. In a custom component (separate mxml file) I'm using the main level Application's state. In Flex3 it was: <mx:State name="only_view_mode"> <mx:RemoveChild target="{myComponent.button1}" /> </mx:State> In Flex4 it should be something like that: <mx:State name="only_view_mode" /> and <mx:LinkButton id="button1" excludeFrom="???" /> My question is: how can I access to an Application state from a component? I checked the official reference (http://www.adobe.com/go/learn_flex4_alldocumentation_en) and Google of course but without any success. Thanks in advance

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• Using a WinForm as a Windows Installer Custom Action

  - by Serexx

  Hello - I am working on in installer project that needs to gather some info and act on it during the install (mainly online key retreival and registration). The Setup Project UserInterface templates seem inflexible and poorly documented so I am looking at opening a WinForm as a Custom Action. I know this is possible because I see reference to it in many places but this is my first Windows Installer experience and so far it is mired in googled contradictions, partial or outdated information and guesswork... erg.... Does anyone have (even a pointer to) a clear concise description of how one gets this done in a VS 2008 WinForm project... Many thanks for inputs

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• DRYing Search Logic in Rails

  - by Kevin Sylvestre

  I am using search logic to filter results on company listing page. The user is able to specify any number of parameters using a variety of named URLs. For example: /location/mexico /sector/technology /sector/financial/location/argentina Results in the following respectively: params[:location] == 'mexico' params[:sector] == 'technology' params[:sector] == 'financial' and params[:location] == 'argentina' I am now trying to cleanup or 'DRY' my model code. Currently I have: def self.search(params) ... if params[:location] results = results.location_permalink_equals params[:location] if results results = Company.location_permalink_equals params[:location] unless results end if params[:sector] results = results.location_permalink_equals params[:sector] if results results = Company.location_permalink_equals params[:sector] unless results end ... end I don't like repeating the searchs. Any suggestions? Thanks.

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• Passing value in silverlight

  - by Dilse Naaz

  How can pass a value from one page to another page in silverlight. I have one silver light application which contains two pages, one xaml.cs file and one asmx.cs file. I have one text box in xaml page names Text1. My requirement is that at the time of running, i could pass the textbox value to asmx.cs file. How it will be done? my code in asmx.cs file is public string DataInsert(string emp) { SqlConnection conn = new SqlConnection("Data Source=Nisam\\OFFICESERVERS;Initial Catalog=Employee;Integrated Security=SSPI"); SqlCommand cmd = new SqlCommand(); conn.Open(); cmd.Connection = conn; cmd.CommandText = "Insert into demo Values (@Name)"; cmd.Parameters.AddWithValue("@Name", xxx); cmd.ExecuteNonQuery(); return "Saved"; } the value xxx in code is replaced by the passed value from xaml.cs page. pls help me

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• how can I design a good architechture for a Transaction Processing System?

  - by ghedas

  I have a project that must design an architecture for it. This project is a something like a Transaction Processing system and I need to know something like this: when and where I must use synchronous and asynchronous relations between its components? If always I use synchronous relations, the amount of messages maybe become exceeded and makes problem for TP system, and on the other hand synchronous relations make lots of delay, I think a mixture of them is required! If other parameters required to considering please help me! the most nonfunctional requirements of this project are performance and availability of it. I need useful materials and suggestions for it.

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• WCF error service error message with shared classes

  - by sevenalive

  Source code: http://code.google.com/p/sevenupdate/source/browse/#hg/Source/SevenUpdate.Base SevenUpdate.Base.Sui cannot be used since it does not match imported DataContract. Need to exclude this type from referenced types. Now I tried unchecking reuse reference types and I was able to get my project to compile. but when sending a collection from the client it was never received or couldn't be deserialized on the server end. I really need this to work. Any help would be appreciated, the fullsource code is provided by google code.

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• javascript open window references

  - by duckofrubber

  Hi, I'm having some issues understanding how to reference new browser windows after opening them. As an example, if I created 3 new windows from a main one (index.html): var one = window.open( 'one.html', 'one',"top=10,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); var two = window.open( 'two.html', 'two',"top=100,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); var three = window.open( 'three.html', 'three',"top=200,left=10,width=100,height=100,location=no,menubar=no,scrollbars=no,status=no,toolbar=no,resizable=no"); two.focus(); How could I programmatically focus on (or just refer to) browser "three" if browser "two" is currently in focus?

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