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  • will destroyed() be emitted if the constructor of a class derived from QObject throws?

    - by PorkyBrain
    Ive seen Qt GUI syntax like the following all over the place: myDialog::myDialog(QWidget *parent, Qt::WFlags flags):QDialog(parent, flags) { QPushButton *button = new QPushButton("&Download", this); QVBoxLayout *layout = new QVBoxLayout(this); //something that can throw here layout ->addWidget(button ); setLayout(layout); } I've always wondered if this can leak in the event of an exception because the "this" I'm giving as a parent to button and layout is not fully constructed so it might not destroy its children. I tried it out in MSVC2010 Qt4.8.3 and it looks like as soon as the base QObject class is fully created (which is done first of course) it is ok to pass "this" to other objects in the constructor, they will destroyed correctly. I haven't found the spot in the Qt docs guaranteeing this though, can someone point me to it so I have assurance that this will not change in the future?

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  • How can I cut down on this spam, and what is the point of it anyway?

    - by Steven
    I run a small, niche personal ads site. People post ads and then other people reply to them, which sends an email to the original creator of the ad telling them that someone is interested and giving them contact information for that interested person. Lately there's been some weird spam. People are receiving nonsense replies to their ads. Here is an example of one: Name: xkauwvyr Reply: vRYmbI <a href="http://rypmoxdkfblf.com/">rypmoxdkfblf</a>, url=http://pnjlwvhizwbq.com/]pnjlwvhizwbq[/url], [link=http://hmenwoujxrfv.com/]hmenwoujxrfv[/link], http://ogsekuhoyeud.com/ They vary in length and composition but they all look roughly like that. The first idea I had was to simply throw out any reply that contained the string " Also, is this spam just some ass playing a trick on my website, or is it something more malicious?

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  • Opening an Excel worksheet inside a Webbrowser.

    - by rabindrarai
    Hi, I have opened a workbook using WebBrowser. However, it opens the first worksheet in the workbook whereas I would like to open a worksheet based on a name that I provide. Following is the code I used to open the workbook: public void OpenFile(string filename) { // Check the file exists if (!System.IO.File.Exists(filename)) throw new Exception(); m_ExcelFileName = filename; // Load the workbook in the WebBrowser control this.wbMain.Navigate(filename, false); } I would like to thank you in advance for trying to help me.

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  • Java LinkedList iterator being exhausted prematurely

    - by Sujeet
    I am using LinkedList and retrieving an Iterator object by using list.iterator(). After that, I am checking it.hasNext(), real issue is while checking it.hasNext(), sometimes it returns false. I need help why this is happening, though I have elements in the list. Some code: public synchronized void check(Object obj) throws Exception { Iterator itr = list.iterator(); while(itr.hasNext()) { //This Line I get false.. though i have list size is 1 Item p = (Item)itr.next(); if(p.getId() == null) {continue;} if(p.getId().getElemntId() == obj.getId() || obj.getId() == 0 ) { p.setResponse(obj); notifyAll(); return; } } Log.Error("validate failed obj.getId="+obj.getId()+" **list.size="+list.size()*This shows 1*); throw new Exception("InvalidData"); }

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  • C# mysql one return last_insert_id

    - by Bernhard
    I am trying to create a method in which I can exequte mysql UPDATE, DELETE or INSERT query. The method must work when with an INSERT I ask or do not ask the last_insert_id(). Below is the code that I have at the moment: public int executeUID(MySqlCommand msCommand) { try { this.Open(); msCommand.Connection = this.msCon; return int.Parse(msCommand.ExecuteScalar().ToString()); } catch (MySqlException ex) { throw ex; } finally { this.Close(); } } The problem with this is is that when I use an insert query that returns a last_insert_id() the method works greatly. But when the query doesn't return an last_insert_id() the method malfunctions. How can I get this method to work?

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  • Factory Method Using Is/As Operator

    - by Swim
    I have factory that looks something like the following snippet. Foo is a wrapper class for Bar and in most cases (but not all), there is a 1:1 mapping. As a rule, Bar cannot know anything about Foo, yet Foo takes an instance of Bar. Is there a better/cleaner approach to doing this? public Foo Make( Bar obj ) { if( obj is Bar1 ) return new Foo1( obj as Bar1 ); if( obj is Bar2 ) return new Foo2( obj as Bar2 ); if( obj is Bar3 ) return new Foo3( obj as Bar3 ); if( obj is Bar4 ) return new Foo3( obj as Bar4 ); // same wrapper as Bar3 throw new ArgumentException(); } At first glance, this question might look like a duplicate (maybe it is), but I haven't seen one exactly like it. Here is one that is close, but not quite: http://stackoverflow.com/questions/242097/factory-based-on-typeof-or-is-a

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  • problem with exporting a customized form from dll

    - by mavric
    I'm working on an application so i have write an dll which contain a form with some additional work and methods. so in the beginning of my program the thread launch this form (from my dll) to get some informations and then hide it and initialize some components and the application form and then show it. when the thread come the line where it define new instance of the exported form "MyForm inputform = new MyForm();" it throw an Exception called "Top-level control cannot be added to a control." so i don't know what to do ?!!. i tried to take the code of the form from the dll source code and put it in the main program and it works.... .but still i want to know what happen and what impede my application from run that form from my dll. thanks.

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  • [C++] Boost test: catch user defined exceptions

    - by user231536
    If I have user defined exceptions in my code, I can't get Boost test to consider them as failures. For example, BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES(MyTest,1) BOOST_AUTO_TEST_CASE(MyTest) { // code which throws user defined exception, not derived from std::exception. } I get a generic message: Caught exception: .... unknown location(0):.... It does not recognize this error as a failure since it is not a std::exception. So it does not honor the expected_failures clause. How do I enforce that the piece of code should always throw an exception? THis seems to be a useful thing to want. In case future code changes cause the code to pass and the exception is not thrown, I want to know that.

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  • Equivalent of c# 'as' command in c++?

    - by Sam
    In c# you can use as to convert a type or get null: Object o = Whatever(); String s = o as String; Is there a similar easy way to achieve this in c++? I'm using Visual Studio 2010, if thats important. [update] Remember, there is a very important difference between casting and using as. Casting (at least in c#) will throw an exception if the type does not match: Object o = null; String s = (String)o; // will crash.

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  • removing the first value in an array c# or java

    - by MrCode
    hey there i was working on a program and was thinking is it possible was to remove the value from the first element in an array. Has anyone any ideas on how this could be done ? thanks for all input is much appreciated. i have only tried removing from the last element wasnt sure on how i would remove the first this is how i done the last element try { if (isEmpty()) { throw new Exception("list is empty"); } size = size -1; return values[size]; } catch(Exception e) { System.out.println(e); return -1; }

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  • Java: ListA.addAll(ListB) fires NullPointerException?

    - by HH
    The err part is Capitalized in the code, it also comes in foreaching. Because of the abstract list, it cannot be initialized, declaration is in a static field. The lists have the same type. import java.util.*; public class Test { public static final List<String> highPrio = Arrays.asList("*","/"); public static List<String> ops; public static void main(String[] args) { //ERROR HERE, why do it throw nullPointer? ops.addAll(highPrio); for(String s : ops) { System.out.println(s); } } }

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  • Class.getArrayType in Java?

    - by ???
    I use the following trick to get the array type of a specific class: @SuppressWarnings("unchecked") public static <T> Class<T[]> getArrayType(Class<T> componentType) { String arrayClassName = "[L" + componentType.getName() + ";"; try { return (Class<T[]>) Class.forName(arrayClassName); } catch (ClassNotFoundException e) { throw new UnexpectedException("Can't get the array type for " + componentType, e); } } But, is there any more elegant way to get this?

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  • When should ThreadLocal be used instead of Thread.SetData/Thread.GetData?

    - by Jon Ediger
    Prior to .net 4.0, I implemented a solution using named data slots in System.Threading.Thread. Now, in .net 4.0, there is the idea of ThreadLocal. How does ThreadLocal usage compare to named data slots? Does the ThreadLocal value get inherited by children threads? Is the idea that ThreadLocal is a simplified version of using named data slots? An example of some stuff using named data slots follows. Could this be simplified through use of ThreadLocal, and would it retain the same properties as the named data slots? public static void SetSliceName(string slice) { System.Threading.Thread.SetData(System.Threading.Thread.GetNamedDataSlot(SliceVariable), slice); } public static string GetSliceName(bool errorIfNotFound) { var slice = System.Threading.Thread.GetData(System.Threading.Thread.GetNamedDataSlot(SliceVariable)) as string; if (errorIfNotFound && string.IsNullOrEmpty(slice)) {throw new ConfigurationErrorsException("Server slice name not configured.");} return slice; }

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  • Django GenericRelation doesn't save related object's id - is this a bug or am I doing it wrong?

    - by pinkeen
    I have a model with a generic relation (call it A), when creating an instance of this object I pass an instance of another model (call it B) as the initializer of the content_object field (via kwargs of the constructor). If I don't save B before creating A then when saving A the content_object_id is saved to the db as NULL. If I save B before passing it to the constructor of A then everything's allright. It's not logical. I assumed that the ID of the related object (B) is fetched when doing A.save() and it should throw some kind of an exception if B isn't saved yet but it just fails silently. I don't like the current solution (saving B beforhand) because we don't know yet if I will be always willing to keep the object, not just scrap it, and there are performance considerations - what if I will add some another data and save it once more shortly after. class BaseNodeData(models.Model): ... extnodedata_content_type = models.ForeignKey(ContentType, null=True) extnodedata_object_id = models.PositiveIntegerField(null=True) extnodedata = generic.GenericForeignKey(ct_field='extnodedata_content_type', fk_field='extnodedata_object_id') class MarkupNodeData(models.Model): raw_content = models.TextField() Suppose we do: markup = MarkupNodeData(raw_content='...') base = BaseNodeData(..., extnodedata=markup) markup.save() base.save() # both records are inserted to the DB but base is stored with extnodedata_object_id=NULL markup = MarkupNodeData(raw_content='...') base = BaseNodeData(..., extnodedata=markup) base.save() markup.save() # no exception is thrown and everything is the same as above markup = MarkupNodeData(raw_content='...') markup.save() base = BaseNodeData(..., extnodedata=markup) base.save() # this works as expected Of course I can do it this way, but it doesn't change anything: base = BaseNodeData(...) base.extnodedata = markup My question is - is this a bug in django which I should report or maybe I'm doing something wrong. Docs on GenericRelations aren't exactly verbose.

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  • C++ runtime, display exception message

    - by aaa
    hello. I am using gcc on linux to compile C++ code. There are some exceptions which should not be handled and should close program. However, I would like to be able to display exception string: For example: throw std::runtime_error(" message"); does not display message, only type of error. I would like to display messages as well. Is there way to do it? it is a library, I really do not want to put catch statements and let library user decide. However, right now library user is fortran, which does not allow to handle exceptions. in principle, I can put handlers in wrapper code, but rather not to if there is a way around Thanks

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  • How to handle uncaught Exceptions in javascript without a try/catch-block?

    - by user344238
    What i try to accomplish is to register a global handler to catch all uncaught exceptions. Searching the web i only managed to find people pointing out window.onerror but this doesn't do the trick for me. Apparently window.onerror only gets called upon errors and not upon exceptions. Assume the following code: function windowError(message, url, line) { alert(message, url, line); } window.onerror=windowError; throw("uncaught"); The obviously uncaught exception won't trigger the windowError handler. (Using Firefox 3.6.3) Any suggestions?

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  • Programmatically get valid switch/case values

    - by craigim
    When MATLAB scans through cases in a switch/case block, does it remember the values that it skips, and is it possible to access that list? I have a few functions with long switch\case block and I would like to have them return a list of valid case values if they make it down to otherwise. For instance, I have a function that returns a set of optical constants for a material. It currently has about 20 different materials and it is growing as I consider new ones. I realize I can brute-force it and just re-type all of the valid cases into a cell array under otherwise and have the function throw an error and return the list of valid responses, but maintaining both lists without errors or laziness creeping in over time is challenging.

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  • When debugging in VS 2008 why does the debugger land on a second return statement?

    - by Hellfire
    When debugging the following console program: class Program { static void Main(string[] args) { Console.WriteLine(DoIt(false)); Console.WriteLine(DoIt(true)); } private static Boolean DoIt(Boolean abort) { try { throw new InvalidOperationException(); } catch(Exception ex) { if (abort) { return true; } Console.WriteLine("Got here"); return false; } } } Why does the IDE land on the second return statement during the second call to DoIt()? The results of the execution is correct but the debugging experience is misleading. Is this a known issue? Is the behavior in VS 2010 the same?

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  • Why the data binding in this validation example works in WPF?

    - by MartyIX
    I'm wondering how exactly the XAML sample (MSDN sample) works: <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> Questions: (Validation.Errors)[0].ErrorContent - Is this code somehow checked by WPF? Because Validation.Errors may be an empty collection and in ordinary C# code this code may throw an exception. If this data-binding returns null for valid input - the null value is then casted to empty string (in a text control for example)? The index 0 corresponds to the first error message. How can I return more error messages from Validate method? Thank you for responses!

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  • Noob question about hibernate criteria

    - by Dimitri
    Hello, I have a class called User which has 2 properties : login/password. I am trying to authenticate a user in my application using hibernate criteria but my request doesn't work. [EDIT] The returned value is NULL. I have two users in my database for testing. Here is my code : @Override public User authenticate(String login, String password) throws NullPointerException { Session session = this.getSession(); User user = (User) session .createCriteria(User.class) .add( Restrictions.and( Property.forName("login").eq(login), Property.forName("password").eq(password) )).uniqueResult(); if (user == null){ throw new NullPointerException("User not found"); } return user; } Can someone tells me what is wrong with my code? Happy new Year 2011 !!

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  • Is it possible for a parent to use a child's constant or static variables from inside a static metho

    - by ryeguy
    Below is an example of what I'm trying to do. The parent can't access any of the child's variables. It doesn't matter what technique I use (static or constants), I just need some kind of functionality like this. class ParentClass { public static function staticFunc() { //both of these will throw a (static|const) not defined error echo self::$myStatic; echo self::MY_CONSTANT; } } class ChildClass extends ParentClass { const MY_CONSTANT = 1; public static $myStatic = 2; } ChildClass::staticFunc();

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  • Why do apps from Android 2.1 stop working with 2.2?

    - by poeschlorn
    Hi guys, I've just updated my nexus one to 2.2. Now all of my (own and some from the market) apps throw exceptions and were closed. It's weird, in the app I'm developing atm, there it displays only my start page with buttons, but when I tap on one button to fire an intent to another activity my app gets closed with an exception. Yesterday before the update everything worked fine. The same thing in my emulator: I have two devices, one with API level 7 and one with level 8. Level 7 worked fine, but level 8 killed my app :( What is the problem and how can I solve this? I'm desperatly trying to get it working again :( I hope someone can help me fixing this

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  • Throwing an AggregateException in my own code

    - by Pat
    How should I go about collecting exceptions and putting them into an AggregateException to re-throw? For my specific code, I have a loop and will have zero or more exceptions thrown from a part of the code. I was hoping to just add the new exceptions to the AggregateException as they arise, but the documentation sort of indicates that it should be constructed with all the Exceptions at once (there is no method to add an Exception to the object). And what about creating a new AE every time and just including the previous AE in the list of exceptions? Seems a hokey way to do it. Any better ideas?

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  • important question on Android 2.2

    - by poeschlorn
    Hi guys, I've just updated my nexus one to 2.2...now all of my (own and some from the market) apps throw exceptions and were closed... It's weird, in the app i'm developing atm, there it displays only my start page with buttons, but when i tap on one button to fire an intent to another activity my app gets closed with an exception. Yesterday before the update everything worked fine... The same thing in my emulator: I have two devices, one with API level 7 and one with level 8...Level 7 worked fine, but level 8 killed my app :( What is the problem and how can I solve this? I'm desperatly trying to get it working again :( I hope someone can help me fixing this

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