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  • Exceptions by DataContext

    - by Bas
    I've been doing some searching on the internet, but I can't seem to find the awnser. What exceptions can a DataContext throw? Or to be more specific, what exceptions does the DataContext.SubmitChanges() method throw?

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  • Initialize a Variable Again.

    - by SoulBeaver
    That may sound a little confusing. Basically, I have a function CCard newCard() { /* Used to store the string variables intermittantly */ std::stringstream ssPIN, ssBN; int picker1, picker2; int pin, bankNum; /* Choose 5 random variables, store them in stream */ for( int loop = 0; loop < 5; ++loop ) { picker1 = rand() % 8 + 1; picker2 = rand() % 8 + 1; ssPIN << picker1; ssBN << picker2; } /* Convert them */ ssPIN >> pin; ssBN >> bankNum; CCard card( pin, bankNum ); return card; } that creates a new CCard variable and returns it to the caller CCard card = newCard(); My teacher advised me that doing this is a violation of OOP principles and has to be put in the class. He told me to use this method as a constructor. Which I did: CCard::CCard() { m_Sperre = false; m_Guthaben = rand() % 1000; /* Work */ /* Convert them */ ssPIN >> m_Geheimzahl; ssBN >> m_Nummer; } All variables with m_ are member variables. However, the constructor works when I initialize the card normally CCard card(); at the start of the program. However, I also have a function, that is supposed to create a new card and return it to the user, this function is now broken. The original command: card = newCard(); isn't available anymore, and card = new CCard(); doesn't work. What other options do I have? I have a feeling using the constructor won't work, and that I probably should just create a class method newCard, but I want to see if it is somehow at all possible to do it the way the teacher wanted. This is creating a lot of headaches for me. I told the teacher that this is a stupid idea and not everything has to be classed in OOP. He has since told me that Java or C# don't allow code outside of classes, which sounds a little incredible. Not sure that you can do this in C++, especially when templated functions exist, or generic algorithms. Is it true that this would be bad code for OOP in C++ if I didn't force it into a class?

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  • Java Interger: what is faster comparison or subtraction?

    - by Vladimir
    I've found that java.lang.Ingteger implementation of compareTo method looks as follows: public int compareTo(Integer anotherInteger) { int thisVal = this.value; int anotherVal = anotherInteger.value; return (thisVal<anotherVal ? -1 : (thisVal==anotherVal ? 0 : 1)); } The question is why use comparison instead of subtraction: return thisVal - anotherVal;

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  • Print/save full webpage as PDF

    - by Oliver
    I need a method to be able to print/save the current full webpage as a PDF. I know it can be done if I download a PDF printer and print to that; but I need it to be done without the user having to do anything other than click a button in a webpage. I can't do it via PHP as the page is all client side content, so I'm guessing an ActiveX component? Any ideas would be greatly appreciated! Many thanks

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  • How to generate real UTF-8 XML with grails without the escape characters?

    - by AngeDeLaMort
    I have been wondering why when I set the encoding to UTF-8 and rendering the XML it replace the extended characters by escape characters (or character reference) like &#x2019; instead of '? I'm using the Render method render(contentType:"text/xml", encoding:"UTF-8") {...} with a proper header render(contentType:"text/xml", encoding:"UTF-8", text:"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n") Any idea if there is a way to write it properly? Thanks.

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  • What is the naming convention in Python for variable and function names?

    - by Ray Vega
    Coming from a C# background the naming convention for variables and method names are usually either CamelCase or Pascal Case: // C# example string thisIsMyVariable = "a" public void ThisIsMyMethod() In Python, I have seen the above but I have also seen underscores being used: # python example this_is_my_variable = 'a' def this_is_my_function(): Is there a more preferable, definitive coding style for Python?

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  • Replace a fragment programmatically

    - by Vishal
    I have three fragments as shown in below figure. I have added all these three fragments in LinearLayout using .xml file and when my launcher activity starts I load that .xml layout using setContentView.I have some controls on fragment2. Clicking on any one loads the fragment4 programmatically using FragmentTransaction and commit method. This fragments is added to the screen but the problem is it take the whole screen area. What can be the problem?

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  • TabBar / "More View Controller" - Possible to have icons in colors other than black?

    - by Malakim
    Hi, Is it possible to have the icons in a TabBar and / or the "More navigation controller" be in colors other than grey and black? I tried changing the color of the icon I set for the view controller using UITabBarItem's - (id)initWithTitle:(NSString *)title image:(UIImage *)image tag:(NSInteger)tag method. My client thinks the interface is too dark and want's to brighten it up with some colorful icons... Thanks!

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  • Django | how to append form field to the urlconf

    - by MMRUser
    I want to pass a form's field value to the next page (template) after user submit the page, the field could be user name, consider the following setup def form_submit(request): if request.method == 'POST': form = UsersForm(request.POST) if form.is_valid(): cd = form.cleaned_data try: newUser = form.save() return HttpResponseRedirect('/mysite/nextpage/') except Exception, ex: return HttpResponse("Ane apoi %s" % str(ex)) else: return HttpResponse('Error') "nextpage" is the template that renders after user submit the form, so I want to know how to append the form's field (user name) to the url and get that value from the view in order to pass it to the next page.. thanks.

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  • .NET read binary contents of .lnk file

    - by Flores
    I want to read the binary contents of a .lnk file. As long as the target of the shortcut (lnk file) exists this works fine with IO.File.ReadAllBytes(string file). BUT If the target of the shortcut does not exist (believe me I want this) the method only returns zero's. I guess this is because the OS follows the link and if it does not exist it returns zero's Is there some way to bypass the fact that the framework follows the target of the .lnk before displaying the contents of the .lnk file?

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  • AppEngine: how do cursors work?

    - by victor a.k.a. python for ever
    hello, i have the following code def get(self): date = datetime.date.today() loc_query = Location.all() last_cursor = memcache.get('location_cursor') if last_cursor: loc_query.with_cursor(last_cursor) loc_result = loc_query.fetch(1) for loc in loc_result: self.record(loc, date) taskqueue.add( url='/task/query/simplegeo', params={'date':date, 'locid':loc.key().id()} ) if len(loc_result): memcache.add('location_cursor', loc_query.cursor()) taskqueue.add(url='/task/count/', method='GET') else: memcache.add('location_cursor', None) i don't know what i'm doing wrong, but i am getting the same cursor which is not the effect i wanted. why isn't the cursor moving?

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  • selecting word from textbox

    - by Eyla
    I'm looking for a method to get the value for a selected word from textbox. For example: I have textbox.Text =" How are you"; when I select "are" I should get message with selected word MessegeBox.Show(selectedWord);

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  • factory girl - know when an attribute is overridden in factory

    - by carlos
    Is there any way to determine if attributes are overridden in a factory and adjust the behavior of the factory based on those overrides? The evaluator passed into the callbacks contains a __override_names__ method. Unfortunately, by the time it is passed to the callback, every attribute configured by the factory is included in the array returned. Moreover, the Evaluator is marked as api private.

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  • How do I compare two complex data structures?

    - by Phil H
    I have some nested datastructures, each something like: [ ('foo', [ {'a':1, 'b':2}, {'a':3.3, 'b':7} ]), ('bar', [ {'a':4, 'd':'efg', 'e':False} ]) ] I need to compare these structures, to see if there are any differences. Short of writing a function to explicitly walk the structure, is there an existing library or method of doing this kind of recursive comparison?

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  • implementing java interface with scala class - type issue

    - by paintcan
    Why on earth won't this compile? Scala 2.8.0RC3: Java public interface X { void logClick(long ts, int cId, String s, double c); } Scala class Y extends X { def logClick(ts: Long, cId: Int,sid: java.lang.String,c: Double) : Unit = { ... } } Error class Y needs to be abstract, since method logClick in trait X of type (ts: Long,cId: Int,s: java.lang.String,c: Double)Unit is not defined

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  • Multiple task in one page?(php - mysql - jquery)

    - by python
    My goal is to build an application in a page that can be use multiple task(crud) for example in this html code.there are multiple submit,multiple action in the same page after (user submit (CURD) it will load result table below.) In juery how Can I do this.? <script type="text/javascript" src="jquery.js"></script> <script> $(document).ready(function(){ $("#button1").click(function(){ $('form#crudform').attr({action: "script_1.php"}); $('form#crudform').submit(); }); $("#button2").click(function(){ $('form#crudform').attr({action: "script_2.php"}); $('form#crudform').submit(); }); $("#button3").click(function(){ $('form#crudform').attr({action: "script_3.php"}); $('form#crudform').submit(); }); }); </script> Form CRUD: <form id="crudform" method="post"> <p>Name: <input type="text" name="name"/></p> <p>Age: <input type="text" name="age"/></p> <input type="button" id="button1" value="Cancel" /> <input type="button" id="button2" value="Save" /> <input type="button" id="button3" value="Update" /> </form> Result: <form id="result" method="post"> <table border="1"> <tr> <tr><td></td><td>Name</td><td>Age</td> </tr> <tr><td><input type="checkbox" name="name1"></td><td>Name1</td><td>10</td><tr> <tr><td><input type="checkbox" name="name1"></td><td>Name2</td><td>15</td></tr> <tr><td><input type="checkbox" name="name3"></td><td>Name3</td><td>16</td></tr> </table> <input type="button" id="button4" value="change" /> <input type="button" id="button5" value="drop" /> </form> Anybody know the tutorials relating ..with my tasks.or tips,guide.....are welconme :)

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  • Longest common substring from more than two strings - Python

    - by Nicolas Noël
    Hi, I'm looking for a python library for finding the longest common substring from a set of python strings. I'have read that it exist to way to solve this problem : - one using suffix trees - the other using dynamic programming. The method implemented is not important. Otherwise, it is important to have a implementation that can be use for a set of strings and not only two strings Thanks,

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