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  • How can I dispose of an object (say a Bitmap) when it becomes orphaned ?

    - by Jelly Amma
    I have a class A providing Bitmaps to other classes B, C, etc. Now class A holds its bitmaps in a ring queue so after a while it will lose reference to the bitmap. While it's still in the queue, the same Bitmap can be checked out by several classes so that, say, B and C can both hold a reference to this same Bitmap. But it can also happen that only one of them checked out the Bitmap or even none of them. I would like to dispose of the bitmap when it's not being needed any more by either A, B or C. I suppose I have to make B and C responsible for somehow signaling when they're finished using it but I'm not sure about the overall logic. Should it be a call to something like DisposeIfNowOrphan() that would be called : 1 - when the Bitmap gets kicked out of the queue in class A 2 - when B is finished with it 3 - when C is finished with it If that's the best strategy, how can I evaluate the orphan state ? Any advice would be most welcome.

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  • "Temporary object" warning - is it me or the compiler?

    - by Roddy
    The following snippet gives the warning: [C++ Warning] foo.cpp(70): W8030 Temporary used for parameter '_Val' in call to 'std::vector<Base *,std::allocator<Base *> >::push_back(Base * const &)' .. on the indicated line. class Base { }; class Derived: public Base { public: Derived() // << warning disappears if constructor is removed! { }; }; std::vector<Base*> list1; list1.push_back(new Base); list1.push_back(new Derived); // << Warning on this line! Compiler is Codegear C++Builder 2007. Oddly, if the constructor for Derived is deleted, the warning goes away... Is it me or the compiler?

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  • [C#]How to change the class of an object dynamically?

    - by codemonkie
    Suppose I have a base class named Visitor, and it has 2 subclass Subscriber and NonSubscriber. At first a visitor is start off from a NonSubscriber, i.e. NonSubscriber mary = new NonSubscriber(); Then later on this "mary" subscribed to some services, and I want to change the type of "mary" to Subscriber. What is the conventional way to do that?

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  • How do I format a String in an email so Outlook will print the line breaks?

    - by MattGrommes
    I'm trying to send an email in Java but when I read the body of the email in Outlook, it's gotten rid of all my linebreaks. I'm putting \n at the ends of the lines but is there something special I need to do other than that? The receivers are always going to be using Outlook. I found a page on microsoft.com that says there's a 'Remove line breaks' "feature" in Outlook so does this mean there's no solution to get around that other than un-checking that setting? Thanks

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  • How to add new object to an IList mapped as a one-to-many with NHibernate?

    - by Jørn Schou-Rode
    My model contains a class Section which has an ordered list of Statics that are part of this section. Leaving all the other properties out, the implementation of the model looks like this: public class Section { public virtual int Id { get; private set; } public virtual IList<Static> Statics { get; private set; } } public class Static { public virtual int Id { get; private set; } } In the database, the relationship is implemented as a one-to-many, where the table Static has a foreign key pointing to Section and an integer column Position to store its index position in the list it is part of. The mapping is done in Fluent NHibernate like this: public SectionMap() { Id(x => x.Id); HasMany(x => x.Statics).Cascade.All().LazyLoad() .AsList(x => x.WithColumn("Position")); } public StaticMap() { Id(x => x.Id); References(x => x.Section); } Now I am able to load existing Statics, and I am also able to update the details of those. However, I cannot seem to find a way to add new Statics to a Section, and have this change persisted to the database. I have tried several combinations of: mySection.Statics.Add(myStatic) session.Update(mySection) session.Save(myStatic) but the closest I have gotten (using the first two statements), is to an SQL exception reading: "Cannot insert the value NULL into column 'Position'". Clearly an INSERT is attempted here, but NHibernate does not seem to automatically append the index position to the SQL statement. What am I doing wrong? Am I missing something in my mappings? Do I need to expose the Position column as a property and assign a value to it myself? EDIT: Apparently everything works as expected, if I remove the NOT NULL constraint on the Static.Position column in the database. I guess NHibernate makes the insert and immediatly after updates the row with a Position value. While this is an anwers to the question, I am not sure if it is the best one. I would prefer the Position column to be not nullable, so I still hope there is some way to make NHibernate provide a value for that column directly in the INSERT statement. Thus, the question is still open. Any other solutions?

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  • Having constrains object to move X,Y at the same time?

    - by Hwang
    The stage is separated into 4 sections, and I will be moving the camera around the stage. So at each particular section the camera will have an area of constrain it can move. I mange to constrain its X & Y, but it could only navigate either X or Y. How to move in X+Y at the same time? if (mouseX>sec2maxX) { TweenLite.to(vC, 1, {x:sec2maxX}); } else if (mouseX<sec2minX) { TweenLite.to(vC, 1, {x:sec2minX}); } else { TweenLite.to(vC, 1, {x:mouseX}); } if (mouseY<sec2minY) { TweenLite.to(vC, 1, {y:sec2minY}); } else if (mouseY>sec2maxY) { TweenLite.to(vC, 1, {y:sec2maxY}); } else { TweenLite.to(vC, 1, {y:mouseY}); } if i were to put X & Y in a same line of code it would be a lot of possibilities when the mouse is on top left or right bottom kind of situation, so I need to have it running seperately, but how can I combine it so that it could move X+Y?

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  • Trouble Avoiding Microsoft Outlook's Email Warning

    - by talbright
    I have a set of records in Microsoft Access that I am trying to send in an Email. The email feature works great. Except a warning message pops up every time a message is ready to send, and the user has to click "Allow" or "Deny" for every email sent. I looked up a workaround, and have been following the tutorial for it: http://www.everythingaccess.com/tutorials.asp?ID=Outlook-Send-E-mail-Without-Security-Warning. My problem is that when I put my message in the function it always returns false, and the message fails. Any help would be appreciated. Dim sendMail As Boolean Dim strMessage As String strMessage = Some Message sendMail = FnSafeSendEmail(![Email Id], "Subject", strMessage) The entire "FnSafeSendEmail" function can be found in the link provided. These are the parameters though. Public Function FnSendMailSafe(strTo As String, _ strCC As String, _ strBCC As String, _ strSubject As String, _ strMessageBody As String, _ Optional strAttachments As String) As Boolean The error is thrown on this line of the function. Dim blnSuccessful As Boolean blnSuccessful = objOutlook.FnSendMailSafe(strTo, strCC, strBCC, _ strSubject, strMessageBody, _ strAttachmentPaths)

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  • JPA DAO integration test not throwing exception when duplicate object saved?

    - by HDave
    I am in the process of unit testing a DAO built with Spring/JPA and Hibernate as the provider. Prior to running the test, DBUnit inserted a User record with username "poweruser" -- username is the primary key in the users table. Here is the integration test method: @Test @ExpectedException(EntityExistsException.class) public void save_UserTestDataSaveUserWithPreExistingId_EntityExistsException() { User newUser = new UserImpl("poweruser"); newUser.setEmail("[email protected]"); newUser.setFirstName("New"); newUser.setLastName("User"); newUser.setPassword("secret"); dao.persist(newUser); } I have verified that the record is in the database at the start of this method. Not sure if this is relevant, but if I do a dao.flush() at the end of this method I get the following exception: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

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  • Weak reference and Strong reference

    - by theband
    package uk.co.bigroom.utils { import flash.utils.Dictionary; /** * Class to create a weak reference to an object. A weak reference * is a reference that does not prevent the object from being * garbage collected. If the object has been garbage collected * then the get method will return null. */ public class WeakRef { private var dic:Dictionary; /** * The constructor - creates a weak reference. * * @param obj the object to create a weak reference to */ public function WeakRef( obj:* ) { dic = new Dictionary( true ); dic[obj] = 1; } /** * To get a strong reference to the object. * * @return a strong reference to the object or null if the * object has been garbage collected */ public function get():* { for ( var item:* in dic ) { return item; } return null; } } } In this Class, how they denote one as Weak Reference and one as Strong reference.

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  • Access VBA remove CR & LF only from the beginning of a text string by searching for them

    - by uZI
    Hi there I need to remove line breaks from the beginning of a memo type records. I dont want to use the replace function as it would remove all line breaks from the record which is not desired. Its only the line breaks at the beginning of the field that I am interested in removing. Furthermore, the my records do not always begin with a line break so I cant really use text positioning, the solution would be to look for line break at the beginning instead of always expecting it at the beginning. click here for a sample of what my data looks like any help will be greatly appreciated

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  • Why doesn't MongoDb store my slashes in this string?

    - by Rob Dudley
    Can anyone tell me why this command doesn't work from the MongoDB shell client: db.coll.update({'live':true},{$set:{'mask':"\D\D\D\D\D\D\D\D"}},false,true) but db.coll.findOne({'id':'someId'}) returns the mask field as: "mask" : "DDDDDDDD", Where are the slashes going? I've tried "double escaping" with \\D and that inserts both slashes: "mask" : "\\D\\D\\D\\D\\D\\D\\D\\D", MongoDB shell version: 2.0.6, MongoDB version: 2.0.5, OSX Lion Thanks

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  • xs:choice unbounded list

    - by Matt
    I want to define an XSD schema for an XML document, example below: <?xml version="1.0" encoding="utf-8"?> <view xmlns="http://localhost/model_data" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://localhost/model_data XMLSchemaView.xsd" path="wibble" id="wibble"> <text name="PageTitle">Homepage</text> <text name="Keywords">home foo bar</text> <image name="MainImage"> <description>lolem ipsum</description> <title>i haz it</title> <url>/images/main-image.jpg</url> <type>image/jpeg</type> <alt>alt text for image</alt> <width>400</width> <height>300</height> </image> <link name="TermsAndConditionsLink"> <url>/tnc.html</url> <title>Terms and Conditions</title> <target>_blank</target> </link> </view> There's a view root element and then an unknown number of field elements (of various types). I'm using the following XSD schema: <?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://localhost/model_data" targetNamespace="http://localhost/model_data" id="XMLSchema1"> <xs:element name="text" type="text_field"/> <xs:element name="view" type="model_data"/> <xs:complexType name="model_data"> <xs:choice maxOccurs="unbounded"> <xs:element name="text" type="text_field"/> <xs:element name="image" type="image_field"/> <xs:element name="link" type="link_field"/> </xs:choice> <xs:attribute name="path" type="xs:string"/> <xs:attribute name="id" type="xs:string"/> </xs:complexType> <xs:complexType name="image_field"> <xs:all> <xs:element name="description" type="xs:string"/> <xs:element name="title" type="xs:string"/> <xs:element name="type" type="xs:string"/> <xs:element name="url" type="xs:string"/> <xs:element name="alt" type="xs:string"/> <xs:element name="height" type="xs:int"/> <xs:element name="width" type="xs:int"/> </xs:all> <xs:attribute name="name" type="xs:string"/> </xs:complexType> <xs:complexType name="text_field"> <xs:simpleContent> <xs:extension base="xs:string"> <xs:attribute name="name" type="xs:string"/> </xs:extension> </xs:simpleContent> </xs:complexType> <xs:complexType name="link_field"> <xs:all> <xs:element name="target" type="xs:string"/> <xs:element name="title" type="xs:string"/> <xs:element name="url" type="xs:string"/> </xs:all> <xs:attribute name="name" type="xs:string"/> </xs:complexType> </xs:schema> This looks like it should work to me, but it doesn't and I always get the following error: Element <text> is not allowed under element <view>. Reason: The following elements are expected at this location (see below) <text> <image> <link> Error location: view / text Details cvc-model-group: Element <text> unexpected by type 'model_data' of element <view>. cvc-elt.5.2.1: The element <view> is not valid with respect to the actual type definition 'model_data'. I've never really used XSD schemas before, so I'd really appreciate it if someone could point out where I'm going wrong.

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  • Pass in the object a java class is embedded in as a parameter.

    - by Leif Andersen
    I'm building an android application, which has a list view, and in the list view, a click listener, containing an onItemClick method. So I have something like this: public class myList extends ListActivity { @Override public void onCreate(Bundle savedInstanceState) { getListView().setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View view, int position, long id) { /* Do something*/ } } } Normally, this works fine. However, many times I find myself needing too preform an application using the outer class as a context. thusfar, I've used: parent.getContext(); to do this, but I would like to know, is that a bad idea? I can't really call: super because it's not really a subclass, just an embedded one. So is there any better way, or is that considered cosure? Also, if it is the right way, what should I do if the embedded method doesn't have a parameter to get the outside class? Thank you.

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  • Ruby on Rails: How best to escape a string in a model?

    - by williamjones
    I want my application to sanitize html on input rather than on display, so that the fields saved into the database are sanitized. I've been doing this with strip_tags, and it was working great. However, this has the downside that it means the user can't input anything that's bracketed with < and . How can I tell Rails in the model to securely escape tags before saving them to the database? I'd like to not have to call h on the sanitized fields again before using them in the views.

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  • Easy way to convert a string of 0's and 1's into a character? Plain C

    - by Nick
    I'm doing a steganography project where I read in bytes from a ppm file and add the least significant bit to an array. So once 8 bytes are read in, I would have 8 bits in my array, which should equal some character in a hidden message. Is there an easy way to convert an array of 0's and 1's into an ascii value? For example, the array: char bits[] = "0,1,1,1,0,1,0,0" would equal 't'. Plain C

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  • Using the Loader display object to load X jpegs, then resize each of the images differently while th

    - by Supernovah
    Hey there, I was wondering if this is possible to do I am able to load the image in and have it displayed easily enough by using addChild(myLoader); where myLoader is in the classWide private scope. The problem is, whenever I call my function inside that class which adds the loader to the stage, it clears the old one and puts this new one in even if I add a bit where I change myLoader.name to something related to how many images it has completed. This is a serious hinderance as I can't do anything besides KNOW how many images I will need to load and write the code X times. The problem being is that the urls are read from an XML file. My main desire was to have a classWide private Array which contained my loaders and I would assign them using myArray.push(myLoader) each time the load had completed. There is a problem which is that it compiles but they never get displayed it would work as this is written public class Images extends Sprite { private var imagesLoaded = 0; private var myLoader:Loader; ... public function Images():Void { myLoader = new Loader; //loop calling a myLoader.load(imageURL) for a bunch of urls myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, imageLoaded); } public function imageLoaded { myArray[imagesLoaded] = myLoader; trace("does\'nt get to here!!"); addChild(myArray[imagesLoaded]); imagesLoaded++; } }

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  • Using jQuery to store basic text string in mySQL base?

    - by Kenny Bones
    Could someone point me in the right direction here? Basically, I've got this jQuery code snippet: $('.bggallery_images').click(function () { var newBG = "url('" + $(this).attr('src'); var fullpath = $(this).attr('src'); var filename = fullpath.replace('img/Bakgrunner/', ''); $('#wrapper').css('background-image', newBG); // Lagre til SQL $.ajax({ url: "save_to_db.php", // The url to your function to handle saving to the db data: filename, dataType: 'Text', type: 'POST', // Could also use GET if you prefer success: function (data) { // Just for testing purposes. alert('Background changed to: ' + data); } }); }); This is being run when I click a certain button. So it's actually within a click handler. If I understand this correctly, this snippet takes the source if the image I just clicked and strips it so I end up with only the filename. If I do an alert(filename), I get the filename only. So this is working ok. But then, it does an ajax call to a php file called "save_to_db.php" and sends data: filename. This is correct right? Then, it does a callback which does an alert + data. Does this seem correct so far? Cause my php file looks like this: <?php require("dbconnect2.php"); $uploadstring = $_POST['filename']; $sessionid = $_SESSION['id']; echo ($sessionid); mysql_query("UPDATE brukere SET brukerBakgrunn = '$uploadstring' WHERE brukerID=" .$_SESSION['id']); mysql_close(); ?> When I click the image, the jQuery snippet fires and I get the results of this php file as output for the alert box. I think that the variables somehow are empty. Because notice the echo($sessionid); which is a variable I've created just to test what the session ID is. And it returns nothing. What could be the issue here? Edit: I just tried to echo out the $uploadstring variable as well and it also returns nothing. It's like the jQuery snippet doesn't even pass the variable on to the php file?

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  • Loading table sections when using headers

    - by Luis Tovar
    I cant seem to wrap my head around this. I have googled, and overstacked for hours now looking for examples that i can relate to. What I have is two arrays. The name of my first NSMutableArray is "showDates". I have 3 objects in here. Object 0: "Today, May 20th" Object 1: "Tomorrow, May 21st" Object 2: "Saturday, May 22nd" Then I have my second NSMutableArray named "showTimes" I have about 15 objects in there with strings in each object. ( i hope that makes sense? ) Each object is structured like this: Object 0: showID @"98022" eventID @"833" showTime @"1:30pm" showDate @"Today, May 20th" auditorium @"9" venue @"2991" Object 1: showID @"98222" eventID @"813" showTime @"2:30pm" showDate @"Tomorrow, May 21st" auditorium @"9" venue @"2991" Etc, etc, .... I have the headers working great in my tableView, but I cant seem to figure out how to add the objects in my "showTimes" array under the correct header. Any help would be greatly appreciated.

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