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  • How do I debug a difficult-to-reproduce crash with no useful call stack?

    - by David M
    I am encountering an odd crash in our software and I'm having a lot of trouble debugging it, and so I am seeking SO's advice on how to tackle it. The crash is an access violation reading a NULL pointer: First chance exception at $00CF0041. Exception class $C0000005 with message 'access violation at 0x00cf0041: read of address 0x00000000'. It only happens 'sometimes' - I haven't managed to figure out any rhyme or reason, yet, for when - and only in the main thread. When it occurs, the call stack contains one incorrect entry: For the main thread, which this is, it should show a large stack full of other items. At this point, all other threads are inactive (mostly sitting in WaitForSingleObject or a similar function.) I have only seen this crash occur in the main thread. It always has the same call stack of one entry, in the same method at the same address. This method may or may not be related - we do use the VCL in our application. My bet, though, is that something (possibly quite a while ago) is corrupting the stack, and the address where it's crashing is effectively random. Note it has been the same address across several builds, though - it's probably not truly random. Here is what I've tried: Trying to reproduce it reliably at a certain point. I have found nothing that reproduces it every time, and a couple of things that occasionally do, or do not, for no apparent reason. These are not 'narrow' enough actions to narrow it down to a particular section of code. It may be timing related, but at the point the IDE breaks in, other threads are usually doing nothing. I can't rule out a threading problem, but think it's unlikely. Building with extra debugging statements (extra debug info, extra asserts, etc.) After doing so, the crash never occurs. Building with Codeguard enabled. After doing so, the crash never occurs and Codeguard shows no errors. My questions: 1. How do I find what code caused the crash? How do I do the equivalent of walking back up the stack? 2. What general advice do you have for how to trace the cause of this crash? I am using Embarcadero RAD Studio 2010 (the project mostly contains C++ Builder code and small amounts of Delphi.)

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  • How to bind to localStorage change event using jQuery for all browsers?

    - by David Glenn
    How do I bind a function to the HTML5 localStorage change event using jQuery? $(function () { $(window).bind('storage', function (e) { alert('storage changed'); }); localStorage.setItem('a', 'test'); }); I've tried the above but the alert is not showing. Update: It works in Firefox 3.6 but it doesn't work in Chrome 8 or IE 8 so the question should be more 'How to bind to localStorage change event using jQuery for all browsers?'

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  • Forcing Spring web services to add the xsd namespace to the response

    - by David Rabinowitz
    I'm using the Spring WS version 1.5.8. My response looks like this: <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> <SOAP-ENV:Header/> <SOAP-ENV:Body> ... </SOAP-ENV:Body> </SOAP-ENV:Envelope> However, my client (whom I integrate with) requires that I will add more namespace declerations in order for the parsing to succeed: <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> ... </soapenv:Body> </soapenv:Envelope> How can I do it?

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  • multi-dimension array value sorting in php

    - by David
    Another potentially interesting (or n00b, whatever comes first) question. I am building up an array with a set of database fields with information about table, actual field name and descriptive field name as a multi-dimensional array. Here is what it currently looks like: $Fields['User']['ID'] = "User ID"; $Fields['User']['FirstName'] = "First Name"; $Fields['Stats']['FavouriteOrder'] = "Favourite Item Ordered"; $Fields['Geographic']['Location'] = "Current Location"; $Fields['Geographic']['LocationCode'] = "Current Location Code"; Okay, this is fine, but I am piping this into a system that allows exporting of selected fields, and in the end I want to foreach() through the different levels, extract the data and then ultimately have all the descriptive fields to be displayed sorted alphabetically using their descriptive name. So ultimately in the order: Current Location, Current Location Code, Favourite Item Ordered, First Name then User ID - obviously keeping index associations. I can't use usort() and I can't use array_multisort()... or maybe I can and I just don't know how. usort() seems to need a key to sort by, but I have variable keys. array_multisort() just seems to do the same as sort() really. Any ideas?

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  • CORE Keygen Problem

    - by David Schiefer
    Hi, after fighting several versions of the CoreKeyGen created by some "minamoto" guy, a new version has appeared. This version is particularly sophisticated and seems to modify the actual binary itself, using a dylib known as libbassmod.dylib (this is in the keygen's mac os folder). Has anyone ever come across this & can give me advice on how to stop it? If so, how can I stop the keygen? it seems like the library can see what calls my app makes and stop them somehow, I'm not too sure.

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  • Would this method work to scale out SQL queries?

    - by David
    I have a database containing a single huge table. At the moment a query can take anything from 10 to 20 minutes and I need that to go down to 10 seconds. I have spent months trying different products like GridSQL. GridSQL works fine, but is using its own parser which does not have all the needed features. I have also optimized my database in various ways without getting the speedup I need. I have a theory on how one could scale out queries, meaning that I utilize several nodes to run a single query in parallel. The idea is to take an incoming SQL query and simply run it exactly like it is on all the nodes. When the results are returned to a coordinator node, the same query is run on the union of the resultsets. I realize that an aggregate function like average need to be rewritten into a count and sum to the nodes and that the coordinator divides the sum of the sums with the sum of the counts to get the average. What kinds of problems could not easily be solved using this model. I believe one issue would be the count distinct function. Edit: I am getting so many nice suggestions, but none have addressed the method.

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  • Insert a datetime value with GetDate() function to a SQL server (2005) table?

    - by David.Chu.ca
    I am working (or fixing bugs) on an application which was developed in VS 2005 C#. The application saves data to a SQL server 2005. One of insert SQL statement tries to insert a time-stamp value to a field with GetDate() TSQL function as date time value. Insert into table1 (field1, ... fieldDt) values ('value1', ... GetDate()); The reason to use GetDate() function is that the SQL server may be at a remove site, and the date time may be in a difference time zone. Therefore, GetDate() will always get a date from the server. As the function can be verified in SQL Management Studio, this is what I get: SELECT GetDate(), LEN(GetDate()); -- 2010-06-10 14:04:48.293 19 One thing I realize is that the length is not up to the milliseconds, i.e., 19 is actually for '2010-06-10 14:04:48'. Anyway, the issue I have right now is that after the insert, the fieldDt actually has a date time value up to minutes, for example, '2010-06-10 14:04:00'. I am not sure why. I don't have permission to update or change the table with a trigger to update the field. My question is that how I can use a INSERT T-SQL to add a new row with a date time value ( SQL server's local date time) with a precision up to milliseconds?

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  • .NET 2.0 vs .NET 4.0 loading error

    - by David Rutten
    My class library is compiled against .NET 2.0 and works just fine whenever I try to load it as a plugin under the 2.0 runtime. If however the master application is running the .NET 4.0 runtime, I get an exception as soon as the resources need to be accessed: Exception occurred during processing of command: Grasshopper Plug-in = Grasshopper Could not find file 'Grasshopper.resources'. Stack trace: at UnhandledExceptionLogger.UnhandledThreadException(Object sender, ThreadExceptionEventArgs args) at System.Windows.Forms.Application.ThreadContext.OnThreadException(Exception t) at System.Windows.Forms.Control.WndProcException(Exception e) at System.Windows.Forms.ControlNativeWindow.OnThreadException(Exception e) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.SafeNativeMethods.ShowWindow(Handle Ref hWnd, Int32 nCmdShow) at System.Windows.Forms.Control.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.Show(IWin32Window owner) .... What's going on and how do I make my project load on all .NET Runtimes?

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  • How to present the same modalView after dismissing it once

    - by David Casillas
    I'm having some problem trying to present a modal view controller after it has been presented the first time, so I just start a little test method, it presents, dismisses and presents again the same controller modally. // This is just test Code. MYViewController *vc = [[MYViewController alloc] init]; [self presentModalViewController:vc animated:YES]; [self dismissModalViewControllerAnimated:YES]; [self presentModalViewController:vc animated:YES]; I get the error: 2011-11-15 09:50:42.678 Proyecto3[1260:11603] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <RootViewController: 0x6d9d090>.' The documentation does not add any clue here.

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  • Creating an SQL Compact file: Template or script?

    - by David Veeneman
    I am writing an application that writes to SQL Compact files that have a specific schema, and I am now implementing the New File use case. The simplest approach seems to be to use a Template pattern: first, create a template file that lives in the application directory. Then, when the user selects New File, the template is copied to the name and destination specified by the user in a New File dialog. The alternative is a scripted approach: Use the same New File dialog, but dispense with the template file. Instead, create an empty SQL Compact file using the name/destination specified by the user, and then execute a T-SQL script on it from managed code. At this point, I am leaning toward the Template approach, because it is simpler. Is there any reason I should not use that approach? Thanks for your help.

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  • Use string value to create new instance

    - by Brian David Berman
    I have a few classes: SomeClass1, SomeClass2. How can I create a new instance of one of these classes by using the class name from a string? Normally, I would do: var someClass1 = new SomeClass1(); How can I create this instance from the following: var className = "SomeClass1"; I am assuming I should use Type.GetType() or something but I can't figure it out. Thanks.

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  • Select from table and function

    - by David Oneill
    I have a function that returns a table. The returned table contains (among other things) a store_id. I can get the store_id for a particular transaction_id and city_id as follows: select store_id from table(f_get_store(city_id, transaction_id)); I have another table that contains a list of transactions (which includes transaction_id and city_id). I want a query that returns store_id, city_id, transaction_id for every entry in the transaction table. My first guess was: select f_get_store(city_id, transaction_id), city_id, transaction_id from table; (simplified away the unimportant details) However, this yields an "ORA-00932: inconsistent datatypes" error. How do I need to structure this query? (I'm using Oracle)

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  • JavaFX Threading issue - GUI freezing while method call ran.

    - by David Meadows
    Hi everyone, I hoped someone might be able to help as I'm a little stumped. I have a javafx class which runs a user interface, which includes a button to read some text out loud. When you press it, it invokes a Java object which uses the FreeTTS java speech synth to read out loud a String, which all works fine. The problem is, when the speech is being read out, the program stops completely until its completed. I'm not an expert on threaded applications, but I understand that usually if I extend the Thread class, and provided my implementation of the speech synth code inside an overridden run method, when I call start on the class it "should" create a new Thread, and run this code there, allowing the main thread which has the JavaFX GUI on to continue as normal. Any idea why this isn't the case? Thanks a lot in advance!

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  • Closing an EDM ObjectContext?

    - by David Veeneman
    I am getting started with the ADO.NET Entity Framework 4.0. I have created an EDM and data store for the app, and it successfully retrieves entities. The application holds the EDM's ObjectContext as a member-level variable, which it uses to call ObjectContext.SaveChanges(). So far, so good. I am going to refactor to repositories later. Right now, my question is a bit more basic: When I am finished with the EDM, what do I need to do to release it? Is it as simple as calling Dispose() on the ObjectContext? Thanks for your help.

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  • Is there a way to synchronize sections of different Word documents? Alternatives?

    - by David Hodgson
    Hi, I'm working on how my company does documentation (especially programming documentation). I'd like to be able to synchronize sections of different Word documents, such that if a section in one document changes, the change is reflected in the other document, and vice versa. Is there a way to do this with Word, and if not, is there some word processing program that is good at this?

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  • Ravendb 960 does not honor JsonIgnore with property of Dictionary<string, object>

    - by David Robbins
    Does JsonIgnore not work when a property has data? I have the followin class: public class SomeObject { public string Name { get; set; } public DateTime Created { get; set; } public List<string> ErrorList { get; set; } [JsonIgnore] public Dictionary<string, object> Parameters { get; set; } public SomeObject() { this.ErrorList = new List<string>(); this.Parameters = new Dictionary<string, object>(); } } My expectation was that JsonIgnore would exclude properties from De- / Serialization. My RavenDB document has data. Am I missing something?

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  • debugging scaffolding contingent upon degbugging boolean (java)

    - by David
    Recently i've found myself writing a lot of methods with what i can only think to call debugging scaffolding. Here's an example: public static void printArray (String[] array, boolean bug) { for (int i = 0; i<array.lenght; i++) { if (bug) System.out.print (i) ; //this line is what i'm calling the debugging scaffolding i guess. System.out.println(array[i]) ; } } in this method if i set bug to true, wherever its being called from maybe by some kind of user imput, then i get the special debugging text to let me know what index the string being printed as at just in case i needed to know for the sake of my debugging (pretend a state of affairs exists where its helpful). All of my questions more or less boil down to the question: is this a good idea? but with a tad bit more objectivity: Is this an effective way to test my methods and debug them? i mean effective in terms of efficiency and not messing up my code. Is it acceptable to leave the if (bug) stuff ; code in place after i've got my method up and working? (if a definition of "acceptability" is needed to make this question objective then use "is not a matter of programing controversy such as ommiting brackets in an if(boolean) with only one line after it, though if you've got something better go ahead and use your definition i won't mind) Is there a more effective way to accomplish the gole of making debugging easier than what i'm doing? Anything you know i mean to ask but that i have forgotten too (as much information as makes sense is appreciated).

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  • How to return all records and whether a related record exists?

    - by David Glenn
    Using Entity Framework 4 CTP5 I have a basic model and a basic DbContext that works public class Customer { public int CustomerId { get; set; } public int Name { get; set; } //... public ICollection<Address> Addresses { get; set; } public bool HasAddress { get { return Addresses.Count > 0; } } } public class Address { public int AddressId { get; set; } public string StreetLine1 { get; set; } //.... public Customer Customer { get; set; } } How can I query my DbContext to return all customers and whether they have an address? A customer can have multiple addresses and I don't want to return all the addresses for each customer when I am only interested in whether they have an address or not. I use context.Customers.Include(c => c.Addresses) but that returns all addresses for each customer

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  • Flex: Run scripts before/after build?

    - by David Wolever
    Currently I'm building my Flex projects using Flex Builder's "built in" build system (ie, "clicking the run button"), but I'd like to start running scripts before/after the build. What's the easiest way to do that? Or, even, where should I start looking?

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  • Enums, Constructor overloads with similar conversions.

    - by David Thornley
    Why does VisualC++ (2008) get confused 'C2666: 2 overloads have similar conversions' when I specify an enum as the second parameter, but not when I define a bool type? Shouldn't type matching already rule out the second constructor because it is of a 'basic_string' type? #include <string> using namespace std; enum EMyEnum { mbOne, mbTwo }; class test { public: #if 1 // 0 = COMPILE_OK, 1 = COMPILE_FAIL test(basic_string<char> myString, EMyEnum myBool2) { } test(bool myBool, bool myBool2) { } #else test(basic_string<char> myString, bool myBool2) { } test(bool myBool, bool myBool2) { } #endif }; void testme() { test("test", mbOne); } I can work around this by specifying a reference 'ie. basic_string &myString' but not if it is 'const basic_string &myString'. Also calling explicitly via "test((basic_string)"test", mbOne);" also works. I suspect this has something to do with every expression/type being resolved to a bool via an inherent '!=0'. Curious for comments all the same :)

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  • getting the "this" that a function's caller was called with in JavaScript

    - by David Morrissey
    Is it possible to get the this that a function's caller was called with in JavaScript without passing this to the arguments in a way which supports IE as well as Firefox/Chrome et al? For example: var ob = { callme: function() { doSomething() } } function doSomething() { alert(doSomething.caller.this === ob) // how can I make this work? } ob.callme() I'm starting to suspect it's not, but I thought I may as well ask as it'd make my code much shorter and easier to read. Thanks for any information!

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  • Add XSLT 2 schema to Visual Studio 2010 for intellisense

    - by David Merrilees
    I'd like to add the XSLT 2 schema to Visual Studio 2010 to provide intellisense. I've added the schema to C:\Program Files\Microsoft Visual Studio 10.0\Xml\Schemas (removing the XSLT 1 schema), but to no avail. The schema seems to have been parsed by Visual Studio, as I can hover my cursor over the namespace declaration in the stylesheet (xmlns:xsl="http://www.w3.org/1999/XSL/Transform") and see the comments from the new schema, however, intellisense still refers to the XSLT 1 implementation. For example the element has a warning that 'xsl:function is not yet available'. Do I need to register the schema in some way? Any suggestions welcome.

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