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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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  • How do I read user input in python thread?

    - by Sid H
    I'm trying to read from a thread in python as follows import threading, time, random var = True class MyThread(threading.Thread): def set_name(self, name): self.name = name def run(self): global var while var == True: print "In mythread " + self.name time.sleep(random.randint(2,5)) class MyReader(threading.Thread): def run(self): global var while var == True: input = raw_input("Quit?") if input == "q": var = False t1 = MyThread() t1.set_name("One") t2 = MyReader() t1.start() t2.start() However, if I enter 'q', I see the following error. In mythread One Quit?q Exception in thread Thread-2: Traceback (most recent call last): File "/usr/lib/python2.6/threading.py", line 522, in __bootstrap_inner self.run() File "test.py", line 20, in run input = raw_input("Quit?") EOFError In mythread One In mythread One How does on get user input from a thread?

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  • Creating standalone, console (shell) for domain-specific operations

    - by mr.b
    Say that I have a system service, and I want to offer a low-level maintenance access to it. For that purpose, I'd like to create a standalone, console application that somehow connects to server process and lets user type in commands, allow it to use auto-completion and auto-suggestion on single/double TAB press (just like linux bash shell, mysql cli, cmd.exe, and countless others), allow command line editing capabilities (history, cursor keys to move around text..), etc. Now, it's not that much of a problem to create something like that by rolling my own from scratch, handling user input, scanning pressed keys, and doing correct actions. But, why reinvent the wheel? Is there some library/framework that helps with this kind of problems, just like readline library that offers improved command-line editing capabilities under linux? Of course, this new "shell" would respond only to valid, domain-specific commands, and would suggest valid arguments, options, switches... Any ideas? Thanks!

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  • jaxb unmarshal problem

    - by Hoax
    private JAXBContext jaxbContext; private Marshaller marshaller; private Unmarshaller unmarshaller; private PoiList db; public XMLHandler() { try { JAXBContext.newInstance("x.y.shared"); } catch (JAXBException e) { e.printStackTrace(); } } public PoiList readXML() { try { unmarshaller = jaxbContext.createUnmarshaller(); unmarshaller.setEventHandler(new XMLValidEventHandler()); db = (PoiList) unmarshaller.unmarshal(new File("src/source.xml")); } catch (JAXBException e) { e.printStackTrace(); } return db; } gets me this Exception in thread "main" java.lang.NullPointerException at com.sem.server.XMLHandler.readXML(XMLHandler.java:32) at sem.server.testDataAPI.main(testDataAPI.java:13) Line 32 in this case is the jaxbContext.createUnmarshaller() Line. packages are x.y.client x.y.server (includes the XMLHandler) x.y.shared (includes jaxb generated classes) not really sure what the problem is. any help is appreciated!

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  • Starting Frame-By-Frame Animation

    - by OceanBlue
    Hi, I have a basic question about starting a frame-by-frame animation. When I call the AnimationDrawable.start() method from my code directly, it doesn't seem to work. public void onCreate(Bundle savedInstanceState) { ... mAnimation.start(); ... } But if I put this line inside the onClick() callback method of a button, pressing the buton starts the animation. Why doesn't this line work in the code? Thanks!

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  • How to make the jump from consumer support to enterprise support?

    - by Zac Cramer
    I am currently a high level consumer break/fix technician responsible for about 300-400 repairs a month. I am good at my job, but bored, and I want to move into the enterprise side of my company, dealing with Server 2008 R2 and exchange and switches and routers that cost more than I make in a month. How do I make this transition? Whats the best thing to learn first? Is there a standard trajectory for making this leap from consumer to business? I am full time employed, so going back to school is not a great option, but I have no life, so spending my nights and weekends reading and practicing is totally within my realm. I am basically overwhelmed by the number of things to learn, and looking for any advice you may have on the best way to proceed. PS - I apologize if this is a not quite the right forum for this, I know its not a technical question exactly, but I also know the sorts of people I want to answer this question are reading this website.

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  • nginx rewrite rule for using domain host to redirect to specific internal directory

    - by user85836
    I'm new to Nginx rewrites and looking for help in getting a working and minimal rewrite code. We would like to use urls like 'somecity.domain.com' on campaign materials and have the result go to city-specific content within the 'www' site. So, here are use cases, if the customer enters: www.domain.com (stays) www.domain.com domain.com (goes to) www.domain.com www.domain.com/someuri (stays the same) somecity.domain.com (no uri, goes to) www.domain.com/somecity/prelaunch somecity.domain.com/landing (goes to) www.domain.com/somecity/prelaunch somecity.domain.com/anyotheruri (goes to) www.domain.com/anyotheruri Here's what I've come up with so far, and it partially works. What I can't understand is how to check if there is no path/uri after the host, and I'm guessing there is probably a way better way to do this. if ($host ~* ^(.*?)\.domain\.com) { set $city $1;} if ($city ~* www) { break; } if ($city !~* www) { rewrite ^/landing http://www.domain.com/$city/prelaunch/$args permanent; rewrite (.*) http://www.domain.com$uri$args permanent; }

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  • How to get hudson to display the SCM diff since last build in the individual build page

    - by Steen
    I'm not sure it's even possible, but my command line usecase goes something like this: do svn update do a svn log -l {how many times since my last commit - 1} do a `svn diff -rHEAD:{my last commit revision + 1} and try to get an overview of what happened since last time I touched the code. I get a lot of valuable information from this, and would like everybody in my team to get the same feeling of control and overview of the code base. Not everyone in my team is comfortable with the command line but like the hudson interface. So; is there a way to the the commit diff since last build (we do a build per commit) in the individual build page?

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  • How to dereference a hashref constant?

    - by makenai
    Let's say I have a hashref constant like the following: use constant DOGS => { Lassie => 'collie', Benji => 'mutt', Scooby => 'great dane', Goofy => '???' }; How can I dereference it properly to get say.. they keys out of it? warn ref DOGS; # HASH at untitled line 12. warn keys( %{DOGS} ); # Warning: something's wrong (empty list) warn keys( DOGS ); # Type of arg 1 to keys must be hash (not constant item) The following is the only way I can seem to make it work: my $dogs = DOGS; warn keys( %$dogs ); # LassieBenjiGoofyScooby at untitled line 15. What am I doing wrong?

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  • Unable to get multiple connection to MySql on Windows 7

    - by Hussain
    I have installed MySql on windows 7 ... issue is i'm unable to get multiple connection to MySql . If I connect to MySql through command line and at the same time open an other MySql command line client it goes into wait state, as soon as I disconnect the first one later one gets connected. Because of above issues I'm unable to run tomcat in debug mode as it tries to get more than one connection to MySql in debug mode. Previously I was using same version of MySql i.e. 5.1 on vista and it was working fine.

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  • What is a good method to use with multithreading to simulate this?

    - by user1504257
    I am writing a program in c++ in visual studio to be able to handle a line at a park. I have all of my customers in a line at the park and I want to be able to service them using multithreading with openmp. When I put the pragma and such in, I have multiple threads servicing the same customer at the same time for each and every customer I create, not what I want. I want for example, if I had two threads and four customers, that thread one to do customer one while thread 2 does customer 2. Then I would like thread 1 to do customer 3 and thread 2 customer 4 at the same time. I don't know if its possible or if there is a better way, but I need to use openmp. Thanks for your input.

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  • Haml::SyntaxError in Static#home?

    - by Koning Baard
    I have this Haml: #index-header %h1 Supersonic Mac Software. %p Some motto %h1 Our Software %p Which will once becoume your's .third-column %h2 Product 1 %p LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL .third-column %h2 Product 2 %p LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL .third-column %h2 Product 3 %p LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL And I get this error: Haml::SyntaxError in Static#home Showing app/views/static/home.html.haml where line #5 raised: Illegal nesting: content can't be both given on the same line as %h1 and nested within it. What am I doing wrong? Thanks.

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  • Error with swig: undefined symbol: _ZN7hosters11hostersLink7getLinkEi

    - by Eduardo
    I'm trying to make a python binding for the this library: http://code.google.com/p/hosterslib/. I'm using swig, heres is the code: %module pyhosters %{ include "hosters/hosters.hpp" %} %include "hosters/hosters.hpp" I run "swig -c++ -python -o swig_wrap.cxx swig.i" and I compile with "g++ -O2 -fPIC -shared -o _pyhosters.so swig_wrap.cxx python-config --libs --cflags -lhosters -lcln -lhtmlcxx pkg-config libglog --libs --cflags -I/usr/include/python2.6 -Wall -Wextra" But when I run python and I import it, I get: import pyhosters Traceback (most recent call last): File "", line 1, in File "./pyhosters.py", line 7, in import _pyhosters ImportError: ./_pyhosters.so: undefined symbol: _ZN7hosters11hostersLink7getLinkEi How can I solve that? Thanks.

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  • Python - werid behavior

    - by orokusaki
    I've done what I shouldn't have done and written 4 modules (6 hours or so) without running any tests along the way. I have a method inside of /mydir/__init__.py called get_hash(), and a class inside of /mydir/utils.py called SpamClass. /mydir/utils.py imports get_hash() from /mydir/__init__. /mydir/__init__.py imports SpamClass from /mydir/utils.py. Both the class and the method work fine on their own but for some reason if I try to import /mydir/, I get an import error saying "Cannot import name get_hash" from /mydir/__init__.py. The only stack trace is the line saying that __init__.py imported SpamClass. The next line is where the error occurs in in SpamClass when trying to import get_hash. Why is this?

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  • How to calculate bandwidth limits per user on WiFi network

    - by Lars
    A typical 802.11g access point can provide around 25 Mbps of bandwidth. How is the bandwidth shared among the users? Furthermore, how many users can be served by a single access point using 802.11g in an environment with low interference, and average web activity from the users? The goal is to use bandwidth limitation to avoid starvation for some users in case some of the users start to download a file or stream HD video or some other bandwidth intensive activity. Can someone break down the math on this?

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  • Surface Detection in 2d Game?

    - by GamiShini
    I'm working on a 2D Platform game, and I was wondering what's the best (performance-wise) way to implement Surface (Collision) Detection. So far I'm thinking of constructing a list of level objects constructed of a list of lines, and I draw tiles along the lines. ( http://img375.imageshack.us/img375/1704/lines.png ). I'm thinking every object holds the ID of the surface that he walks on, in order to easily manipulate his y position while walking up/downhill. Something like this: //Player/MovableObject class MoveLeft() { this.Position.Y = Helper.GetSurfaceById(this.SurfaceId).GetYWhenXIs(this.Position.X) } So the logic I use to detect "droping/walking on surface" is a simple point (player's lower legs)-touches-line (surface) check (with some safety approximation - let`s say 1-2 pixels over the line). Is this approach OK? I`ve been having difficulty trying to find reading material for this problem, so feel free to drop links/advice.

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  • Why a variable is seen in the loop and is not seen outside the loop?

    - by Roman
    I have the following code: String serviceType; ServiceBrowser tmpBrowser; for (String playerName: players) { serviceType = "_" + playerName + "._tcp"; tmpBrowser = BrowsersGenerator.getBrowser(serviceType); tmpBrowser.browse(); System.out.println(tmpBrowser.getStatus()); } System.out.println(tmpBrowser.getStatus()); The compiler complains about the last line. It writes "variable tmpBrowser might not been initialized". If I comment the last line the compile does not complain.

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  • Installing CakePHP on Windows with Apache

    - by GeoSQL
    Hi, I'm trying to install CakePHP on my Windows XP machine running Apache 2.2. I have installed the Cake folder in my doc root. I've read the installation instructions that say to include this line in the httpd.conf file; <Directory /path/to/cake> Does anyone know how to translate that into Windows? I currently have the following in my conf file: <Directory "C:/Apache/Apache2.2/htdocs/cakeapp/"> Whenever I uncomment this line it crashes Apache. I've tried switching the slashes to "\" and I tried taking the slash off the end. Any advice? Thanks

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  • Troubleshooting MSSQL Connection from PHP

    - by Cory Dee
    I'm trying to connect to an external Sql Server through PHP 5.2. Using this line: $con = mssql_connect('123.123.123.123','Username','Password') or die('Could not connect to the server!'); I'm receiving this error: Warning: mssql_connect() [function.mssql-connect]: Unable to connect to server: 123.123.123.123 in /home/file/public_html/structure/index.php on line 4 Could not connect to the server! My hosting provider assures me that ports are open for my server to connect to the DB. Looking at my php info, MSSQL Support is enabled, using FreeTDS. Any ideas why this would be failing, or how I can begin trouble shooting the problem?

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  • GIS: line_locate_point() in Python

    - by miracle2k
    I'm pretty much a beginner when it comes to GIS, but I think I understand the basics - it doesn't seem to hard. But: All these acronyms and different libraries, GEOS, GDAL, PROJ, PCL, Shaply, OpenGEO, OGR, OGC, OWS and what not, each seemingly depending on any number of others, is slightly overwhelming me. Here's what I would like to do: Given a number of points and a linestring, I want to determine the location on the line closest to a certain point. In other words, what PostGIS's line_locate_point() does: http://postgis.refractions.net/documentation/manual-1.3/ch06.html#line%5Flocate%5Fpoint Except I want do use plain Python. Which library or libraries should I have a look at generally for doing these kinds of spatial calculations in Python, and is there one that specifically supports a line_locate_point() equivalent?

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  • SQL Server 2005 drop column with constraints

    - by Julien N
    Hi ! In Sql Server 2005 I have a column with a "DEFAULT" constraint. I'd like to create a script that drops that column. The problem is that is returns me that error : Msg 5074, Level 16, State 1, Line 1 The object 'DF__PeriodSce__IsClo__4BCC3ABA' is dependent on column 'IsClosed'. Msg 4922, Level 16, State 9, Line 1 ALTER TABLE DROP COLUMN IsClosed failed because one or more objects access this column. I couldn't find an easy way to drop a column and all its associated constraints (only found big scripts that look into system table... there MUST (!!) be a "nice" way to do that !). And as the DEFAULT constraint's name has been randomly generated, I can't drop it by name. Thanks for your help.

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  • PHP does not work over ssl connections

    - by Haluk
    Hi, I just got my ssl certificate to work for the first time. For some reason when I connect to my website using https my browser tries to download the php file. I have the following line in my httpd.conf. Isn't this the line which makes sure php files are run using php? AddType application/x-httpd-php .php What else do I need to change so that I can get the php files to work over the https connection. Thanks!

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  • DTD definition error

    - by Geln Yang
    Hi, It will get a error to define a dtd as follow: <!ELEMENT line (property*)> <!ATTLIST line showType (1|?|+|*) "1" > The error: The name token is required in the enumerated type list for the "showType" attribute declaration. It seems the value can't be special characters,such as "?","+","*". To change the characters to Latin-1 characters, like "& #42;"(add a blank before '#') , get the same error. How to resolve this problem? Thanks!

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  • Windows 8.1 Professional Hyper-V - can I create my own linux VM through it?

    - by KevinM1
    I have a Windows 8.1 Professional desktop, and would like to have a Linux Mint VM on it so I can do some opensource web development work. I've tried VirtualBox, but it's giving me an IO error during the Mint .iso installation. VMWare Player flat out tells me it can't install because I have Hyper-V on my machine by default. My biggest concern is nuking the desktop, which is where I do most of my non-development work/browsing/etc. The desktop seems to be listed as a VM itself in the Hyper-V Manager, and I don't want to accidentally break it. So, two questions: Can I create the Mint VM I want/need for my work? Can I do it without messing up the desktop?

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