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  • How does cast in C#/.NET 3.5 work for types with '?'

    - by Inez
    This is my code which works public decimal? Get() { var res = ... return res.Count() > 0 ? res.First() : (decimal?) null; } and this one doesn't work public decimal? Get() { var res = ... return res.Count() > 0 ? res.First() : null; } giving the compiler error: Error 1 Type of conditional expression cannot be determined because there is no implicit conversion between 'decimal' and '<null>' I wonder why? any ideas?

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  • An old flaw in X Window System. How does it work?

    - by Legend
    I was going through an article today when it mentioned the following: "We've found many errors over the years. One of the absolute best was the following in the X Window System: if(getuid() != 0 && geteuid == 0) { ErrorF("Only root"); exit(1); } It allowed any local user to get root access. (The tautological check geteuid == 0 was intended to be geteuid() == 0. In its current form, it compress the address of geteuid to 0; given that the function exists, its address is never 0)." The article explained what was wrong with the code but I would like to know what it means to say that "It allowed any local user to get root access". I am not an expert in C but can someone give me an exact context in which this exploit would work? Specifically, what I mean is, lets say I am the local user, how would I get root access if we assume this code to be present somewhere?

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  • Does the jQuery .unbind() method only work on jQuery created events?

    - by Roberto Sebestyen
    I am trying to unbind all event handlers for all elements that are inside a particular container. Like a DIV. But those events have been bound/registered not using jQuery. Some are bound the manual way with onclick="...." or using regular native JavaScript. But when i do something like this $('#TheDivContainer').find('div,td,tr,tbody,table').unbind(); It does not appear to work. Which leads me to believe that the .unbind() only works if the events have been originally bound by jQuery. Is that true? Is there another way of unbinding all events from a group of elements ? Thanks!

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  • Setting custom HTTP request headers in an URL object doesn't work.

    - by Blagovest Buyukliev
    I am trying to fetch an image from an IP camera using HTTP. The camera requires HTTP basic authentication, so I have to add the corresponding request header: URL url = new URL("http://myipcam/snapshot.jpg"); URLConnection uc = url.openConnection(); uc.setRequestProperty("Authorization", "Basic " + new String(Base64.encode("user:pass".getBytes()))); // outputs "null" System.out.println(uc.getRequestProperty("Authorization")); I am later passing the url object to ImageIO.read(), and, as you can guess, I am getting an HTTP 401 Unauthorized, although user and pass are correct. What am I doing wrong? I've also tried new URL("http://user:pass@myipcam/snapshot.jpg"), but that doesn't work either.

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  • HELP! need to make a VoIP program for WiMAX in NS-2 work..

    - by janiemack
    I've been trying to get this working for the past 2 days and i'm completely stuck. I'm trying to make a simple VoIP program work in the NIST module for WiMAX http ://community.4gdeveloper.com/attachments/download/14/090720150504_ns2-Release-2.6.tar.gz version 2.6 , using NS-2.31 (remove space btw 'p' and ':' ) http ://downloads.sourceforge.net/nsnam/ns-allinone-2.31.tar.gz?modtime=1173548159&big_mirror=0 (remove space btw 'p' and ':' ) The installation process goes fine. When i run this program, I'm getting an error saying " OFDMAPhy : error did not find match for permutation and bw combination" Some help would be really appreciated. thanks!

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  • Unbind Events with JQuery: Does it work with events setup in HTML?

    - by Abs
    Hello all, I have a few onclick and on mouseover events in my html generated by PHP, something like this: <div onmouseover="fave('heart_<?php echo $row['id']; ?>';" class="heart"><a href=""></a></div> I wish to make use of unbind on the mouseover but it hasn't worked when I tried this: $('#'+ id).unbind('mouseover'); So I am guessing unbind will only work with events created by JQuery? Is there something else I can try? Btw, I can't move my events to a separate js file as each id is unique and. Thanks all

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  • For loop to extract info from a structure doesn't work?

    - by ZaZu
    I have a structure in matlab that has a value of <1x1 struct>., its name is figurelist. Inside that structure, there is a field called images. Inside images, I have 25 images that have the name img1, img2, img3, ...... , img25. Now I made a for loop to extract those images, I basically did: For K=1:25 image(figurelist.images.imgK) PAUSE(0.25) End This unfortunately doesnt work. I get an error saying : ??? Reference to non-existent field 'imgK'. Is it possible to extract such info using a loop from a structure? Or am I doing something wrong? Thanks.

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  • Where does static variable work in C# page. At Application level or Page Level

    - by Shantanu Gupta
    I had an interview today and every thing was going very good, but then an interviewer asked me a question Where Does Static Variable Work in C#- At Application Level or At Page Level. I was not very much clear about this answer as I only knew that static variables are stored on heap and I didn't knew anything about web related thing about it. Then tried to make me more clear by giving an example that in a page I am using static variable and three users are accessing the page one of the user updates the value of static variable, What value will be visible to remaining two users an old copy or the update will be reflected.

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  • @Intertceptors does not work for web bean for JSF page.

    - by Drevlyanin
    @Named @ConversationScoped @Interceptors(MyInterceptor.class) public class BeanWeb implements Serializable { public String methodThrowException throws Exception() { throws new Exception(); } } public class MyInterceptor { @AroundInvoke public Object intercept(InvocationContext ic) throws Exception { try { return ic.proceed(); } catch (Exception e) { return null; } } } For @Stateless beans interceptor works, but for the BeanWeb interceptor does not work. And we have never entered into "intercept" method. Why is this happening? How could intercept method calls in BeanWeb? P.S.: All this spin under Glassfish 3.x.

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  • git merge, git rebase none seems to work, should I delete my github fork and refork from the upstream master?

    - by Joan Yin
    I have to confess my github sins. 4 month ago, I forked a upstream repo, without knowing much of git and pull request, i did some work on master branch locally, later on I realized the mistake, created a new branch, and squashed the changes to one and successfully send a PR later from that branch. the PR is accepted, and I moved on. Now I need to submit another PR. But my master branch is so messed up, when I do merge, or rebase, there are so many mistakes. I probably committed a few more sins this morning. I have been battling this for the whole morning now. so it comes to the point that I want a clean start. Can I delete the github fork and refork from the upstream master? What are the correct steps?

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  • How do I make my horizontally scrolling page work in IE?

    - by Jessica
    I am using a horizontal scroll for a page on my website ~ works great in FF but not in IE, how can i get it to work in IE? Here is the JS that I have in the head of my html: <script src="js/jquery-1.2.6.min.js" type="text/javascript" charset="utf-8"></script> <script type="text/javascript" charset="utf-8"> $(function(){ $("#page-wrap").wrapInner("<table><tr>"); $(".post").wrap("<td>"); });</script> There is also of course the other script file, but its huge so I'm not going to post it here. Is there a hack or something I can use to get it to scroll correctly in IE? Thx in advance!

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  • Simple php statement, I can't get it to work!

    - by eberswine
    How to get $schedule = true and $schedule = true to work??? I know this is easy and I'm overlooking something simple! else { if($schedule){ $where[] = 'date > '.(time() + $config_date_adjust * 60 - 432000); } else{ $where[] = 'date < '.(time() + $config_date_adjust * 60); } $schedule = false; } else { if($schedule2){ $where[] = 'date > '.(time() + $config_date_adjust * 60 - 86400); } else{ $where[] = 'date < '.(time() + $config_date_adjust * 60); } $schedule2 = false; }

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  • Why does GetExportedValues<T>() no longer work after using the .net 4 final version of MEF?

    - by BigJason
    I have been developing a managed extensibility framework application for the last several months using the community preview. I have been using the GetExportedValues() method and the PartCreationPolicy(CreationPolicy.NonShared) to fake a class factory (since only the silverlight version supports a factory). This was working great until I upgraded the project to use .net 4.0. There is no error, it just doesn't work. So why did this code stop working? The code follows: The factory method: public static IEnumerable<DataActionBase> GetActionsFromDirectory(string PluginsFolder) { IEnumerable<DataActionBase> result = null; var catalog = new DirectoryCatalog(PluginsFolder); var container = new CompositionContainer(catalog: catalog); result = container.GetExportedValues<DataActionBase>(); return result; } Example Export Class: [Export(typeof(DataActionBase))] [PartCreationPolicy(CreationPolicy.NonShared)] public class AnAction : DataActionBase { .... }

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  • How to make a custom template in WordPress work as a password protected page?

    - by KaOSoFt
    I'm building a page with a custom template. The thing is, I need this page to be password protected, or at least accessible to logged in users, but even if I set it as such (Private/Password protected) in the New Pages section in WordPress Administration, it won't display the menu entry nor the content (if Private) or it would show the page contents immediately (if Password protected). I've read somewhere that the_content() function is what makes this work, but as you can guess, my custom template doesn't use the_content() at all, and it's all based on custom content. Do you happen to know how can I (re)implement these two options?

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  • Darwin kernel architecture and OS X, 64bit on 32bit kernel, how does this work?

    - by overscore
    The OS X Lion (10.7) OS runs on mostly 64-bit binaries as reported by Activity Monitor. Given this, and the fact that my laptop runs a 32-bit version of the EFI and thus also a 32-bit kernel, how does the arch mixing work in general? Darwin Kernel Version 11.3.0: Thu Jan 12 18:48:32 PST 2012; root:xnu-1699.24.23~1/RELEASE_I386 Normally one would run 32b binaries on x86_64, but the other way around would require pushing the cpu into 64b mode, which AFAIK cannot be undone. Hope this question is clear enough..

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  • Why Camera.setParameters(Camera.Parameters) does not work on Sony-Ericsson X10 and Droid?

    - by mobilekid
    Has anyone come across a strange behaviour with the Camera API when used on Sony-Ericsson X10 or Droid? For example the following code doesn't work on those devices. As a result I'm getting a lot of negative feedback on the Market translating into many cancelled orders... mParameters.set("rotation", orientation); mParameters.set("jpeg-quality", img_quality); mParameters.set("picture-size", "1024x768"); mCamera.setParameters(mParameters); Could you suggest an alternative way of achieving the same? Thanks.

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  • Why wont this simple code work all of a sudden?

    - by eric
    Why wont this print "success" when i submit the form?!?! Im pretty sure it should work. <?php if (count($_POST) > 0) { echo "success!!"; } ?> <form method="post" enctype="multipart/form-data"> <input type="file" name="userfile" /> <input type="submit" value="upload" /> </form>

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  • weird problem..the exact xml work in one host and not working in another...

    - by Ofear
    hi all! i search alot for this but can't find an aswer... I have made a working xml parser using php. till today i host my files on a free web host, and everything works just fine. today i got access to my college server and i host my files there. now for some reason.. i can't make the parser work as i was in the free host... look on those files please: working site: xml file: [http://ofear.onlinewebshop.net/asce/calendar.xml] working parser is this: [http://ofear.onlinewebshop.net/asce/calendar.php] (the lower table is the xml,it's hebrew) not working site: xml file: [http://apps.sce.ac.il/agoda/calendar.xml] not working parser is this: [http://apps.sce.ac.il/agoda/calendar.php] anyone have idea why it's not working.. those are the same files and they should work. maybe it a server problem? calendar.xml: <?xml version="1.0" encoding="UTF-8" ?> <events> <record> <event>??? ???? ????? ???? ???</event> <eventDate>30/12/2010</eventDate> <desc>?????? ?? ????</desc> </record> <record> <event>??? ???? ??????? - 2 : ???? ??? ???? ??????</event> <eventDate>22/12/2010</eventDate> <desc>????? ???? ??????? ?????? ??? ???? ??????? ?????? ????? ?????? ?? ??? ???? ??????? 2 ??????? ????? ???????? 22-23 ?????? 2010. ???? ????? ???? ????? "?????? ????"</desc> </record> <record> <event>????? ???? ?????? ?????? - ?? ????</event> <eventDate>5/12/2010</eventDate> <desc>??? ????? 17:30-20:45</desc> </record> </events> parser: <?php $doc = new DOMDocument(); $doc->load( 'calendar.xml' ); $events = $doc->getElementsByTagName( "record" ); foreach( $events as $record ) { $events = $record->getElementsByTagName( "event" ); $event = $events->item(0)->nodeValue; $eventDates= $record->getElementsByTagName( "eventDate" ); $eventDate= $eventDates->item(0)->nodeValue; $descs = $record->getElementsByTagName( "desc" ); $desc = $descs->item(0)->nodeValue; echo "<tr><td>$event</td><td>$eventDate</td><td>$desc</td></tr>"; } ?> after a little debugging i saw that it's stop here: $doc = new DOMDocument(); and it's not doing anything after that. i think that the line above is the cos

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  • work question how to start working as a programmer what do i need!

    - by giorgo
    Hi i am learning java and php i have some projects from uni.(Gui,s in java with mysql and a web application in php with mysql ++ more things like this.) i have started learning mvc struts spring and i also lerning php +zend +++++ more stuff etc....you can't learn everything!!!!!!!!!!!!!!!!!!!!!!! I would like to ask how can i find a job as a programmer-software eng because i have send my cv in many companys but all of them said me that i need work expirience. How All of you started your programming expirience. Did you make some projects and send them did you you have somebody that help you ...??? i am totaly alone i do everything by my self. can anyone answer this?everybody starts from somewhere but what if this somewhere don't come?what to do ?? how to start !!!!!!! Thanks

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  • how to make this piece of code work in C++?

    - by cambr
    #include<stdio.h> void print(int *arr[], int s1, int s2) { int i, j; printf("\n"); for(i = 0; i<s1; i++) { for(j = 0; j<s2; j++) { printf("%d, ", *((arr+i)+j)); } } printf("\n"); } int main() { int a[4][4] = {{0}}; print(a,4,4); } This works in C, but not in C++. error: cannot convert `int (*)[4]' to `int**' for argument `1' to `void print(int**, int, int)' Why does it not work in C++? What change is needed to be made?

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  • Publishing via "File System" in Visual Studio 2010 - Doesn't work!

    - by Django Reinhardt
    Hi, this is an extremely frustrating situation. We have just upgraded to Visual Studio 2010, and very nice it is, except for when it won't do something really simple, like Publish your ASP.NET Web Application to a folder on your desktop. For some unearthly reason, what used to work flawlessly in 2008 is now generating an error: It stops Publishing, after successfully Building, saying: Error: Copying file Images\Profile\32_32.JPG to obj\x64\Release\Package\PackageTmp\Images\Prolfile\32_32.JPG failed. Could not find file 'Images\CelebrityProfileImages\32_32.JPG'. The problem is that there isn't any reference to that file in the project code (in the database, yes, but not in the code itself), and we don't want to store such images with the project (and they're not). Why (and how) has it suddenly decided that this unreferenced image (and presumably more if I get it to move past this one) is suddenly necessary to run the project? How can I stop this from happening? Thanks for any help.

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  • Should properties in C# perform a lot of work?

    - by Hamish Grubijan
    When a property is read from or is assigned to, one would not expect it to perform a lot of work. When setSomeValue(...) and getSomeValue(...) methods are used instead, one should not be that surprised that something non-trivial might be going on under the hood. However, now that C# gave the world Properties, it seems silly to use getter and setter methods instead. What is your take on this? Should I mark this Q as a community wiki? Thanks.

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  • focus() jQuery function doesn't work in Safari, but works fine on all other browsers?

    - by pMan
    I have a search text field and search button, when button is clicked with default text in text field, or null value, an alert pops up and sets focus back on search text field. This works very well on all major browsers but not in safari. I tried it even with out jquery, but didn't work. When the focus falls on search text field, I have another jQuery function, is that the problem. The code that sets focus on search text is: if (defaults.keyword == SEARCH_TIP || defaults.keyword == '') { alert(SEARCH_NULL); $('#store_search_keyword').focus(); return false; } The code on focus is: var search_dom = $('#store_search_keyword'); var search_text = search_dom.val(); search_dom.focus(function(){ if ($(this).val() === SEARCH_TIP) { $(this).val(''); } }); any help is appreciated, thanks..

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  • jQuery - Why doesn't combining has() and gt() work in some cases?

    - by KatieK
    I wanted to select any ul which contains more than 3 lis. This code worked with the 1.2.6 jQuery library: $("ul:has(li:gt(2))") .each( function() { $(this).css("border", "solid red 1px"); }); But not 1.3.2 or 1.4.2. This code worked with the 1.4.2 jQuery library: $('ul').has('li:nth-child(3)').css('border', 'solid red 1px'); But not v1.2.6. Why does each version work with one library version, but not the other? Am I encountering some kind of bug, or am I doing something wrong? Any help understanding , or differences to be aware of between different versions of the jQuery libraries, would be much appreciated. Thanks!

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  • Is the syntax written in descrition is correct for MySQL Triggers? will it work?

    - by Parth
    Is the syntax written in descrition is correct for MySQL Triggers? will it work? CREATE OR REPLACE TRIGGER myTableAuditTrigger 2 AFTER INSERT OR DELETE OR UPDATE ON myTable 3 FOR EACH ROW 4 BEGIN 5 IF INSERTING THEN 6 INSERT INTO myTableAudit (id, Operation, NewName, NewPhone) 7 VALUES (1, 'Insert ', :NEW.Name, :NEW.PhoneNo); 8 ELSIF DELETING THEN 9 INSERT INTO myTableAudit (id, Operation, OldName, OldPhone) 10 VALUES (1, 'Delete ', :OLD.Name, :OLD.PhoneNo); 11 ELSIF UPDATING THEN 12 INSERT INTO myTableAudit (id, Operation, 13 OldName, OldPhone, NewName, NewPhone) 14 VALUES (1, 'Update ', 15 :OLD.Name, :OLD.PhoneNo, :NEW.Name, :NEW.PhoneNo); 16 END IF; 17 END; 18 /

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