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• For buffer overflows, what is the stack address when using pthreads?

  - by t2k32316

  I'm taking a class in computer security and there is an extra credit assignment to insert executable code into a buffer overflow. I have the c source code for the target program I'm trying to manipulate, and I've gotten to the point where I can successfully overwrite the eip for the current function stack frame. However, I always get a Segmentation fault, because the address I supply is always wrong. The problem is that the current function is inside a pthread, and therefore, the address of the stack seems to always change between different runs of the program. Is there any method for finding the stack address within a pthread (or for estimating the stack address within a pthread)? (note: pthread_create's 2nd argument is null, so we're not manually assigning a stack address)

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• Fiscal year handling strategies in database design

  - by Sapphire

  By fiscal year I mean all the data in the database (in all tables) that occurred in the particular year. Lets say that we are building an application that allows user to choose from different years. What way of implementing this would you prefer, and why: Separate fiscal year data based on multiple separate database instances (for example, on every fiscal year start you could create a new instance with no data) Have everything in one database, but with logic that automatically separates records from different years. Personally, I have "seen" both methods, and I would choose the second. The only argument I can think of for the first method is to have less records in case that these are really big databases - but still, you could "archive" old records by joining them in summaries or by some other way. What do you think?

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• nunit-console.exe problem with Mono

  - by prosseek

  I could make a dll for NUnit (http://stackoverflow.com/questions/2967726/nunit-test-under-mono), but when I tried to run in with nunit-console.exe I get the following error message. Runtime Environment - OS Version: Unix 10.3.0.0 CLR Version: 2.0.50727.1433 ( 2.6.4 (tarball Thu Apr 22 13:24:33 MDT 2010) ) ProcessModel: Default DomainUsage: Single Execution Runtime: mono-2.0 ** (/Users/smcho/bin/NUnit-2.5.5.10112/bin/net-2.0/nunit-console.exe:36800): WARNING **: The following assembly referenced from /private/var/folders/m4/m4u1hmP+FHOQaiZbHj1UCk+++TI/-Tmp-/nunit20/ShadowCopyCache/36800_634111616836311880/Tests_-22323139/assembly/shadow/54274fc2/118e035c_45a94c9e_00000001/mut.dll could not be loaded: Assembly: nunit.framework (assemblyref_index=1) Version: 2.5.5.10112 Public Key: 96d09a1eb7f44a77 System error: Invalid argument ** (/Users/smcho/bin/NUnit-2.5.5.10112/bin/net-2.0/nunit-console.exe:36800): WARNING **: Could not load file or assembly 'nunit.framework, Version=2.5.5.10112, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77' or one of its dependencies. What might be wrong? I have nunit.framework.dll under /Users/smcho/bin/NUnit-2.5.5.10112/bin/net-2.0/framework, but it doesn't seem to know about this.

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• Spark view engine and ASP.NET MVC 2 strongly Typed Html Helpers

  - by dekko

  Hi. I try to use HtmlHelper.TextBoxFor with spark view engine but view crashed with exception "Dynamic view compilation failed. 'System.Web.Mvc.HtmlHelper' does not contain a definition for 'TextBoxFor' and no extension method 'TextBoxFor' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?)". It is my _global.spark: <use namespace="System"/> <use namespace="System.Linq"/> <use namespace="System.Text" /> <use namespace="System.Web.Mvc"/> <use namespace="System.Web.Mvc.Html"/> <use namespace="System.Web.Routing"/> <use namespace="System.Linq.Expressions" /> <use namespace="MyModels" /> In spark-view using: ${Html.TextBoxFor(m = m.UserName)}

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• Passing arguments by value or by reference in objective C

  - by Rafael

  Hello, I'm kind of new with objective c and I'm trying to pass an argument by reference but is behaving like it were a value. Do you know why this doesn't work? This is the function: - (void) checkRedColorText:(UILabel *)labelToChange { NSComparisonResult startLaterThanEnd = [startDate compare:endDate]; if (startLaterThanEnd == NSOrderedDescending){ labelToChange.textColor = [UIColor redColor]; } else{ labelToChange.textColor = [UIColor blackColor]; } } And this the call: UILabel *startHourLabel; (this is properly initialized in other part of the code) [self checkRedColorText:startHourLabel]; Thanks for your help

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• Building cURL & libcurl with Visual Studio 2010

  - by KTC

  With the help of question #197444, I have managed to build cURL & libcurl from source on Windows from within the Visual Studio 2010 IDE, OpenSSL 1.0.0, and zlib 1.2.5. The problem I see is that at the moment, if I run the resulting curl.exe with the argument -V, then the version that it report is curl 7.20.1 (i386-pc-win32) libcurl/7.20.1 OpenSSL/0.9.8d zlib/1.2.3 Protocols: dict file ftp ftps http https imap imaps ldap pop3 pop3s rtsp smtp smtps telnet tftp Features: AsynchDNS Largefile NTLM SSL libz Note the versions reported for both OpenSSL & zlib doesn't match if what I actually used. Any idea on how to fix this? p.s. Is there a clear list of optional components that can be compiled into libcurl and what options/preprocessor directive to use? (e.g. SSPI, libidn, ...?)

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• Cocoa structs and NSMutableArray

  - by Circle

  I have an NSMutableArray that I'm trying to store and access some structs. How do I do this? 'addObject' gives me an error saying "Incompatible type for argument 1 of addObject". Here is an example ('in' is a NSFileHandle, 'array' is the NSMutableArray): //Write points for(int i=0; i<5; i++) { struct Point p; buff = [in readDataOfLength:1]; [buff getBytes:&(p.x) length:sizeof(p.x)]; [array addObject:p]; } //Read points for(int i=0; i<5; i++) { struct Point p = [array objectAtIndex:i]; NSLog(@"%i", p.x); }

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• WiX - create a bootstrap that passes arguments to the msi

  - by Dror Helper

  I need to create a bootstrap for my WiX project I've tried using setupbld.exe but it will only allow me to create an executable that will show my UI or one that will behave as a silent installer but not both. I need to be able to run the resulting executable with argument that will tell it wether or not to show the UI during installation. I've found this post by John Robbins that explains how to re-build the setup.exe stub used in the creation of the bootstrap but I was hoping there is a simpler way to do what I need. Does anyone know of a way to create a bootstrap that I use to run either as a simple (with UI) install or as a silent install.

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• What does this mean: warning: converting from ‘void (ClassName::*)()’ to ‘void (*)()’

  - by Brendan Long

  I have a member function in a class that has a callback, but the callback isn't strictly neccessary, so it has a default callback, which is empty. It seems to work fine, but I get an annoying warning: warning: converting from ‘void (ClassName::*)()’ to ‘void (*)()’ I'm trying to figure out what it means and how to turn it off (or fix it if I really am doing something wrong). Here's some simple code: class ClassName{ public: void doSomething(void (*callbackFunction)() = (void(*)()) &ClassName::doNothing){ callbackFunction(); } void doNothing(){} }; int main(){ ClassName x; x.doSomething(); return 0; } Note: If I do this (without explicitly casting it as a void(*)()): void doSomething(void (*callbackFunction)() = &ClassName::doNothing) I get this: main.cpp:3: error: default argument for parameter of type ‘void (*)()’ has type ‘void (ClassName::*)()’

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• Usabe of Python 3 super()

  - by deamon

  I wonder when to use what flavour of Python 3 super(). Help on class super in module builtins: class super(object) | super() -> same as super(__class__, <first argument>) | super(type) -> unbound super object | super(type, obj) -> bound super object; requires isinstance(obj, type) | super(type, type2) -> bound super object; requires issubclass(type2, type) Until now I've used super() only without arguments and it worked as expected (by a Java developer). Questions: What does "bound" mean in this context? What is the difference between bound and unbound super object? When to use super(type, obj) and when super(type, type2)? Would it be better to name the super class like in Mother.__init__(...)?

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• C# - Pass by value & Pass by Reference

  - by Lijo

  Hi Team, Could you please explain the following behavior of C# Class. I expect the classResult as "Class Lijo"; but actual value is “Changed”. We’re making a copy of the reference. Though the copy is pointing to the same address, the method receiving the argument cannot change original. Still why the value gets changed ? public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Person p = new Person(); p.Name = "Class Lijo"; Utilityclass.TestMethod(p); string classResult = p.Name; Response.Write(classResult); } } public class Utilityclass { public static void TestMethod(Person k) { k.Name = "Changed"; } } public class Person { private string name; public string Name { get { return name; } set { name = value; } } } Thanks Lijo

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• How can I get TFS 2010 to build each project to a separate directory?

  - by Jonathan Schuster

  In our project, we'd like to have our TFS build put each project into its own folder under the drop folder, instead of dropping all of the files into one flat structure. To illustrate, we'd like to see something like this: DropFolder/ Foo/ foo.exe Bar/ bar.dll Baz baz.dll This is basically the same question as was asked here, but now that we're using workflow-based builds, those solutions don't seem to work. The solution using the CustomizableOutDir property looked like it would work best for us, but I can't get that property to be recognized. I customized our workflow to pass it in to MSBuild as a command line argument (/p:CustomizableOutDir=true), but it seems MSBuild just ignores it and puts the output into the OutDir given by the workflow. I looked at the build logs, and I can see that the CustomizableOutDir and OutDir properties are both getting set in the command line args to MSBuild. I still need OutDir to be passed in so that I can copy my files to TeamBuildOutDir at the end. Any idea why my CustomizableOutDir parameter isn't getting recognized, or if there's a better way to achieve this?

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• Tutorial: Simple WCF XML-RPC client

  - by mr.b

  Update: I have provided complete code example in answer below. I have built my own little custom XML-RPC server, and since I'd like to keep things simple, on both server and client side, what I would like to accomplish is to create a simplest possible client (in C# preferably) using WCF. Let's say that Contract for service exposed via XML-RPC is as follows: [ServiceContract] public interface IContract { [OperationContract(Action="Ping")] string Ping(); // server returns back string "Pong" [OperationContract(Action="Echo")] string Echo(string message); // server echoes back whatever message is } So, there are two example methods, one without any arguments, and another with simple string argument, both returning strings (just for sake of example). Service is exposed via http. Aaand, what's next? :)

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• parsing a list and producing a structure of that

  - by qzar

  ;; structure representing homework points ;; nr: number - the number of the homework ;; points: number - the number of points reached (define-struct homework (nr points)) ;; parse-homework: (list of number pairs) -> (list of homework) ;; The procedure takes a list of number pairs and produces a list of homework structures ;; Example: (parse-homework (list (list 1 6) (list 2 7) (list 3 0))) should produce (list (make-homework 1 6) (make-homework 2 7) (make-homework 3 0)) (define (parse-homework homework-entries) (if (and (= (length (first homework-entries) 2))(= (length (parse-homework (rest homework-entries)) 2))) (make-homework (first homework-entries) (parse-homework (rest homework-entries))) (error 'Non-valid-input "entered list is not of length two")) ) (parse-homework (list (list 1 6) (list 2 7) (list 3 0))) This code produces the error length: expects 1 argument, given 2: (list 1 6) 2 I really appreciate every explanation that you can give me to get in in this scheme-stuff... Thank you very much

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• LiveJournal xmlrpc date out of order option

  - by Robert Gonzalez

  I am having an issue adding posts to LiveJournal via the xmlrpc api they provide. I want to add entries older than what I have listed on LiveJournal already. But I get a response saying: "You have an entry which was posted at 2009-09-06 18:32, but you're trying to post an entry before this. Please check the date and time of both entries. If the other entry is set in the future on purpose, edit that entry to use the "Date Out of Order" option. Otherwise, use the "Date Out of Order" option for this entry instead." I haven't found an argument for the "Date Out of Order" option using the LJ.XMLRPC.postevent method. Any help would be highly appreciated.

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• Why 'initWithObjectsAndKeys:' doesn't throw a casting warning? (NSDictionary)

  - by rubdottocom

  Sorry if the question isn't correct, I'm very new in Objective-C. I understand why this code throw the Warning: "warning: passing argument 1 of 'initWithObjectsAndKeys:' makes pointer from integer without" NSDictionary *dictNames = [[NSDictionary alloc] initWithObjectsAndKeys: 3, @"", 4, @"", 5, @"",nil]; Keys and Values of a NSDictionary must be NSObject and not fundamental types, like the integers 3, 4 and 5. (Correct me if necessary). But I don't understand why this warning dissapears with the only "correct typing" of the first Key. NSDictionary *dictNames = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithInteger:3], @"", 4, @"", 5, @"",nil]; It's because NSDictionary assumes the type of the other Keys? Is correct this manner of initialization?

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• Where is ~/.config/MonoDevelop/ for MonoDevelop

  - by jpm

  I'm using Mac Snow Lepord and can't find "~/.config/MonoDevelop/" for the life of me. I have MonoDevelop (v2.2.2) up and running already, but when I tried to set up a template the IDE started having problems. Namely, whenever I went to Monodevelop - preferences- Code Templates I would get an error saying "Argument cannont be null". I tried removing MonoDevelop from my Mac and re-installing but that doesn't appear to fix this problem so I thought if I could find the above folder maybe I could remove that. However I am not sure how to find it. I put the address directly into Mac's "finder" search box and no results were returned. Can anyone help?

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• Creating a Wiki site in SharePoint 2010

  - by Ben

  I have a SharePoint 2010 site set up and would like to add a Wiki site to it. Normally, to add a subsite to a parent site you would click "Site Actions" - "New Site" and choose the site type (e.g. Team Site) and it would work fine. In the case of adding a Wiki site, I choose "Enterprise Wiki", and get "Error An Unexpected Error has occured Correlation Id:...". So i took the CorrelationId and checked in the ULS files to see what the error is, and the first bad sign seems to be: SharePoint Foundation Feature Infrastructure " The element of type 'ContentTypeBinding' for feature 'EnterpriseWiki' (id: 76d688ad-c16e-4cec-9b71-7b7f0d79b9cd) threw an exception during activation: Specified argument was out of the range of valid values. Parameter name: Content type not found (Id: '0x010100C568DB52D9D0A14D9B2FDCC96666E9F2007948130EC3DB064584E219954237AF39004C1F8B46085B4D22B1CDC3DE08CFFB9C')." There are more errors in the log, but this seems to be the first one. Any ideas on whats going on? Thanks

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• jQuery, insertBefore, validation, Placement of error message

  - by Steve

  I am using insertBefore under errorplacement to add validation messages, each one below each other as I want the order of the messages to go from top to bottom. I am using a hidden input at the very bottom of a parent element in order to supply an element for the insertBefore argument. Is there a way to insert from the bottom without using the dummy hidden element? If I use absolute positioning, there is a possibility for white space, for example 3 stacked messages, the middle one missing since there is no collapsing with absolute positioning.

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• Using SAS Macro to pipe a list of filenames from a Windows directory

  - by Bazil

  I am trying to amend the macro below to accept a macro parameter as the 'location' argument for a dir command. However I cannot get it to resolve correctly due to the nested quotes issue. Using %str(%') does not work, neither do quoting functions for some reason. The macro will work fine when the filepath has no spaces (eg C:\temp\withnospace) as the middle quotes aren't needed. However I need this macro to work for filepaths with spaces (eg 'C:\temp\with space\'). Please help! %macro get_filenames(location) filename pipedir pipe "dir &location. /b " lrecl=32767; data filenames; infile pipedir truncover; input line $char1000.; run; %mend; %get_filenames(C:\temp\) /* works */ %get_filenames('C:\temp\with space') /* doesnt work */

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• Usage of Python 3 super()

  - by deamon

  I wonder when to use what flavour of Python 3 super(). Help on class super in module builtins: class super(object) | super() -> same as super(__class__, <first argument>) | super(type) -> unbound super object | super(type, obj) -> bound super object; requires isinstance(obj, type) | super(type, type2) -> bound super object; requires issubclass(type2, type) Until now I've used super() only without arguments and it worked as expected (by a Java developer). Questions: What does "bound" mean in this context? What is the difference between bound and unbound super object? When to use super(type, obj) and when super(type, type2)? Would it be better to name the super class like in Mother.__init__(...)?

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• Assert a good practice or not ?

  - by rkenshin

  Is it a good practice to use Assert for function parameters to enforce their validity. I was going through the source code of Spring Framework and I noticed that they use Assert.notNull a lot. Here's an example public static ParsedSql parseSqlStatement(String sql) { Assert.notNull(sql, "SQL must not be null");} Here's Another one public NamedParameterJdbcTemplate(DataSource dataSource) { Assert.notNull(dataSource, "The [dataSource] argument cannot be null."); this .classicJdbcTemplate = new JdbcTemplate(dataSource); } public NamedParameterJdbcTemplate(JdbcOperations classicJdbcTemplate) { Assert.notNull(classicJdbcTemplate, "JdbcTemplate must not be null"); this .classicJdbcTemplate = classicJdbcTemplate; } Thank you

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• NSDictionary with key => String and Value => c-Style array

  - by Gautam Borad

  I need an NSDictionary which has key in the form of string (@"key1", @"key2") and value in the form of a C-style two-dimentional array (valueArray1,valueArray2) where valueArray1 is defined as : int valueArray1[8][3] = { {25,10,65},{50,30,75},{60,45,80},{75,60,10}, {10,70,80},{90,30,80},{20,15,90},{20,20,15} }; And same for valueArray2. My aim is given an NSString i need to fetch the corresponding two-dimentional array. I guess using an NSArray, instead of c-style array, will work but then i cannot initialize the arrays as done above (i have many such arrays). If, however, that is doable please let me know how. Currently the following is giving a warning "Passing argument 1 of 'dictionaryWithObjectsAndKeys:' from incompatible pointer type" : NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:valueArray1,@"key1", valueArray2,@"key2",nil];

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• Model availability inside ActionFilter

  - by Sayed Ibrahim Hashimi

  I have created a new ActionFilter for an ASP.NET MVC application that I'm creating. I have an action which accepts an Http Post and the argument of the action method accepts an object, for which I have created and registered a custom model binder. I noticed that inside the IActionFilter.OnActionExecuting the value for filterContext.Controller.ViewData.Model is always null despite the fact that it looks like the model binder is always invoked before the action filter OnActionExecuting method. In contrast to this inside the IActionFilter.OnActionExecuted method of the same action filter the value for filterContext.Controller.ViewData.Model is not null. Do you guys know if this is by design or a bug? If by design are their any links which describe why this is? Thanks.

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• Android: Filtering a SimpleCursorAdapter ListView

  - by Diego Tori

  Right now, I'm running into issues trying to implement a FilterQueryProvider in my custom SimpleCursorAdapter, since I'm unsure of what to do in the FilterQueryProvider's runQuery function. In other words, since the query that comprises my ListView basically gets the rowID, name, and a third column from my databases's table, I want to be able to filter the cursor based on the partial value of the name column. However, I am uncertain of whether I can do this directly from runQuery without expanding my DB class since I want to filter the existing cursor, or will I have to create a new query function in my DB class that partially searches my name column, and if so, how would I go about creating the query statement while using the CharSequence constraint argument in runQuery? I am also concerned about the performance issues associated with trying to run multiple queries based on partial text since the DB table in question has about 1300-1400 rows. In other words, would I run into a bottleneck trying to filter the cursor?

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