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  • Using C++, how to call a base class method from a derived class method and apply this to an object passed as an argument?

    - by Chris
    I can't figure out how to call a base class method from a derived class method but concurrently applying this method call at an object passed as argument. What I mean is this: class Animal { virtual void eat(Animal& to_be_eaten) = 0; }; class Carnivores: public Animal { virtual void eat(Animal& to_be_eaten) { /*implementation here*/} }; class Wolf : public Carnivores { virtual void eat(Animal& to_be_eaten) { /*call eat method(of Base class) of Base to_be_eaten here*/ } } I thought of something like this dynamic_cast<Carnivores&>(to_be_eaten).eat(*this) //and got a segmentation fault Is there any way for this to be done? Thank you! New edit:: Updated the code

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  • Abstract classes in shared library

    - by JTom
    Hi, I have an ordinary abstract class that has couple of pure virtual methods. The class itself is a part of the shared library. The compilation of the shared library itself is OK. But when the library is linked to another program that has another class deriving from the abstract one in the shared library and defining the pure virtual methods, I get the following linker error: I compile like this..: g++ -I../path/to/the/library main.cpp derived.cpp -L../path/to/the/library -lsomename -o shared ...and the linker error is: libsomename.so: undefined reference to `AbstractClass::method()' It's like the abstract class cannot access its pure virtual methods but I do not try to make any instance of the abstract class anywhere in the library. What could be the problem?

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  • How to connect a USB dongle to Windows XP Mode?

    - by Ivo Flipse
    I'm trying to connect a Matrix dongle to Windows XP Mode, but when looking under USB options it's not listed. Example: The dongle get's recognized by the Windows 7 device manager as a HID-compliant device, so it's properly connected. Does anyone have an idea how to make Virtual PC recognize the dongle? I'm running Windows 7 Professional x64

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  • Unpause application in Mac OS X

    - by Xster
    I tried parsing a gigantic XML file and I ended up running out of virtual memory. The OS put all my applications on pause and gave me a screen to shutdown applications to free more space. I killed the XML parsing application and now have tons of space but I can't resume my paused applications anymore. What should I do?

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  • unable to access jarfile alliance.tmp

    - by john
    I just installed the p2p software Alliance. When I'm trying to open Alliance a "Java Virtual Machine Launcher" window pops up with this error message: "unable to access jarfile alliance.tmp". What can I do to use alliance anyway? Thanks.

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  • Is there a vmware appliance for software development?

    - by Ali Shafai
    I use Assembla.com and it does everything I need, SVN, bug tracking, ticketing... the only thing I don't like is that the server is not mine, I'm putting all my company property on a server in the coulds. I was wondering if there is an virtual machine to download and put on my server to serve all Assembla does?

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  • Migrating VirtualPC images to Hyper-V

    - by Andrey
    I have a couple of development Virtual PC images; now I installed Windows Server 2008 + Hyper-V on my main dev laptop and need to migrate those images to Hyper-V. Google only finds steps for some older version of Hyper-V - I don't even see the wizard steps they are talking about. Any help would be highly appreciated!

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  • VM image including ready-to-use Kerberos server?

    - by Nicolas Raoul
    I implemented client-side Kerberos support to an open source software, and I want to test it. I don't have a Kerberos network at home and unfortunately don't have the skills/time to reliably set up one. Is there a Virtual Machine image that I could fire up, and that would include a properly working Kerberos environment, so that I can test my client app? (freely downloadable Linux/Microsoft/anything all acceptable)

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  • Bind9 virtual subdomains

    - by Steffan
    I am trying to setup virtual subdomains using Bind9, following this tutorial.. http://groups.drupal.org/node/16862 which I've completed. Basically setting up the zone and modifying the resolv.conf file and the named.conf.local file. I've gotten everything to work, and I am able to from my server ping mydomain.com , test.mydomain.com and when i do a dig I get the following.. ; <<>> DiG 9.7.0-P1 <<>> test.mydomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32606 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1 ;; QUESTION SECTION: ;test.mydomain.com. IN A ;; ANSWER SECTION: test.mydomain.com. 86400 IN A 174.###.###.# ;; AUTHORITY SECTION: mydomain.com. 86400 IN NS mydomain.com. ;; ADDITIONAL SECTION: mydomain.com. 86400 IN A 174.###.###.# ;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Wed Jan 19 21:06:01 2011 ;; MSG SIZE rcvd: 86 So it looks like everything is working. However, when I try and do test.mydomain.com in the browser, expecting it to default for now to mydomain.com it does not work and I get a server not found page in Firefox. I did read elsewhere that in your virutalhosts file you also need to setup a *.mydomain.com alias, but that didn't fix anything. Any other information that I could provide to help troubleshoot, or any troubleshooting suggestions? I am using Ubuntu 10.4, with typical LAMP setup. The only other things installed on the server are Bind9 and ftp client.

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  • How to access VMWare localhost from my mac?

    - by Abe Miessler
    I have developed a asp.net application on my VMWare virtual machine that I can access (on my VM) by going to http://localhost:1044 How can I access this from safari on my Mac that is running the VM? I tried running ipconfig on my VM and then using the IP address that was given for "Ethernet adapter Local Area Connection", something like this: http://192.168.179.139:1044/ but this throws a not found error. I am currently using NAT. How can I get to localhost on my VM from my mac?

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  • How to troubleshoot performance issues of PHP, MySQL and generic I/O

    - by jbx
    I have a WordPress based website running on a shared hosting. Its response time is very decent (around 2s to retrieve the HTML page and 5s to load all the resources). I was planning to move it to a dedicated virtual server (Ubuntu 12.04 LTS), which should theoretically improve things and make them more consistent given its not shared. However I observed severe performance degredation, with the page taking 10seconds to be generated. I ruled out network issues by editing /etc/hosts on the server and mapping the domain to 127.0.0.1. I used the Apache load tester ab to get the HTML, so JS, CSS and images are all excluded. It still took 10 seconds. I have Zpanel installed on the server which also uses MySQL, and its pages come up quite fast (1.5s) and also phpMyAdmin. Performing some queries on the wordpress database directly through phpMyAdmin returns them quite fast too, with query times in the 10 to 30 millisecond region. Memory is also sufficient, with only 800Mb being used of the 1Gb physical memory available, so it doesn't seem to be a swap issue either. I have also installed APC to try to improve the PHP performance, but it didn't have any effect. What else should I look for? What could be causing this degradation in performance? Could it be some kind of I/O issue since I am running on a cloud based virtual server? I wish to be able to raise the issue with my provider but without showing actual data from some diagnosis I am afraid he will just blame my application. UPDATE with sar output (every second) when I did an HTTP request: 02:31:29 CPU %user %nice %system %iowait %steal %idle 02:31:30 all 0.00 0.00 0.00 0.00 0.00 100.00 02:31:31 all 2.22 0.00 2.22 0.00 0.00 95.56 02:31:32 all 41.67 0.00 6.25 0.00 2.08 50.00 02:31:33 all 86.36 0.00 13.64 0.00 0.00 0.00 02:31:34 all 75.00 0.00 25.00 0.00 0.00 0.00 02:31:35 all 93.18 0.00 6.82 0.00 0.00 0.00 02:31:36 all 90.70 0.00 9.30 0.00 0.00 0.00 02:31:37 all 71.05 0.00 0.00 0.00 0.00 28.95 02:31:38 all 14.89 0.00 10.64 0.00 2.13 72.34 02:31:39 all 2.56 0.00 0.00 0.00 0.00 97.44 02:31:40 all 0.00 0.00 0.00 0.00 0.00 100.00 02:31:41 all 0.00 0.00 0.00 0.00 0.00 100.00 My suspicion that this comes from I/O related issue is also because a caching plugin I use to reduce the amount of queries to the database, by precompiling PHP pages is actually making things worse instead of better. It seems that file access is making things worse instead.

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  • Server 2012 - Hyper V Manager, RemoteFX missing From Hardware List

    - by Brett Smith
    I've installed Remote Desktop Services and Hyper-V on a server running Windows Server 2012. The Hyper-V settings are showing my GPU as selected for use with RemoteFX as below However when I go to add the hardware to a virtual machine it does not show up in the list of available hardware. Sorry, If I'm a little light on details, I'm not sure where to start on this I've been searching for answers for the better part of the day without much luck

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  • Windows 7 fails to install on KVM with qemu

    - by kief_morris
    I'm trying to install Windows 7 on a virtual machine on my 64 bit Ubuntu Karmic box. I get to the point of selecting my language settings and clicking 'install now', but a short while later I get a blue screen of death. I've tried a few variations, including using the 32 bit (fails very quickly). The virt-install command I've tried includes this: sudo virt-install --connect qemu:///system -n ksm-win7 -r 2048 \ --disk path=/home/kief/VM-Images/ksm-win7.qcow2,size=50 \ -c /var/Software/Windows7/Full/64bit/SW_DVD5_SA_Win_Ent_7_64BIT_English_Full_MLF_X15-70749.ISO \ --vnc --os-type windows --os-variant vista --hvm The limited info I could find suggested that 'vista' should work as the --os-variant, I haven't found any values specific to windows 7. Here's my blue screen: I've found very little by Googling, so I'm guessing this isn't a case of KVM simply not supporting Windows 7. Thanks for any help. Update: I have been able to successfully create a Windows 7 VM using the graphical "Virtual Machine Manager" app, although I don't really understand the cause of the problem with the VM created with virt-install. Comparing the configuration files under /etc/libvirt/qemu provides some clues, although I don't know enough to interpret them properly. The interesting differences in the two VM configurations are: --- win7-virt-install.xml +++ win7-vmm.xml -<domain type='qemu'> +<domain type='kvm'> @@ -21 +21 @@ - <emulator>/usr/bin/qemu-system-x86_64</emulator> + <emulator>/usr/bin/kvm</emulator> @@ -23 +23 @@ - <source file='/home/kief/VM-Images/ksm-win7.qcow2'/> + <source file='/var/lib/libvirt/images/ksm-win7x64.img'/> I'm not sure if this means the working VM is not using qemu at all, or if there is some other difference in the way it's used with kvm. Update2: So I've answered my own question (mostly) below. A KVM VM needs to use KVM's own CPU emulation rather than qemu's in order for me to get Windows 7 installed. I'm not sure whether there is something that can be done to get it working on a qemu-emulation CPU, or whether a newer version will support it. But at least it is possible to get it running on a KVM VM.

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  • NIS client cannot find NIS server (Opensuse)

    - by Tony
    I installed NIS server on head node of a virtual cluster(VirtualBox). One of the node (let's say node-1) can find NIS server and work with it, but another node (node-2) just can't find the NIS server in Yast while it can ping and ssh to both head node and node-1. BTW, all the nodes are VMs, head node and node-1 are on the same physical machine, node-2 is on another physical machine. I set the domain name in /etc/hosts and /etc/yp.conf, and ypwhich sometimes gives the correct domainname several minutes later complains about "ypwhich: Can't communicate with ypbind", and will back to work after some time. Also tried rpcinfo -p hostname and it worked as expected. I almost tried every thing I can find on internet, but seems that not many people had this problem. Any help would be very appreciated.

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  • How to install software on Amazon EC2 Windows instance?

    - by JohnIdol
    I've never used Amazon EC2 - I am thinking to test a few instances for running intensive computation processes I have a requirement for rather than buying real hardware. I am given to understand the thing is quite easy to setup - but I have no clue of how it actually works. Can I upload disc images and install just any software as on any other virtual machine or is there any significant difference? Any help appreciated!

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  • Handling site not found and page not found with dynamic mass virtual hosting

    - by Rick Moynihan
    I have recently setup mass virtual hosting in Apache so that all we need to do is create a directory to create a new vhost. We're then also using wildcard DNS to map all subdomains to the server running our Apache instance. This works excellently, however I'm now having trouble configuring it to fail-over to an appropriate default/error-page when the vhost directory does not exist. The problem appears to be conflated between by my desire to handle the two error conditions: vhost not found i.e. there was no directory found matching the host supplied in the HTTP host header. I'd like this to display an appropriate site not found error page. The 404 page not found condition of the vhost. Additionally I have a specialised "api" vhost in its own vhost block. I've tried a number of variations and none seem to exhibit the behaviour I want. Here's what I'm working with right now: NameVirtualHost *:80 <VirtualHost *:80> DocumentRoot /var/www/site-not-found ServerName sitenotfound.mydomain.org ErrorDocument 500 /500.html ErrorDocument 404 /500.html </VirtualHost> <VirtualHost *:80> ServerName api.mydomain.org DocumentRoot /var/www/vhosts/api.mydomain.org/current # other directives, e.g. setting up passenger/rails etc... </VirtualHost> <VirtualHost *:80> # get the server name from the Host: header UseCanonicalName Off VirtualDocumentRoot /var/www/vhosts/%0/current # other directives ... e.g proxy passing to api etc... ErrorDocument 404 /404.html </VirtualHost> My understanding is that the first vhost block is used as the default, so I have this here as my catch all site. Next I have my API vhost, and then finally my mass vhost block. So for a domain that doesn't match the first two ServerName's and has no corresponding directory in /var/www/vhosts/ I'd expect it to fall-over to the first vhost, however with this setup, all domains resolve to my default site-not-found. Why is this? By putting the mass-vhost block first, I can get the mass-vhosts to resolve properly, but not my site-not-found vhost... and in this case I can't seem to find a way to distinguish between a page-level 404 in the vhost, and the case where the VirtualDocumentRoot fails to find a vhost directory (this appears to use the 404 also). Any help out of this bind is much appreciated!

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  • Multiple Audio I/P and O/P simultaneaously

    - by Raj Naveen
    hi (1) i saw in one of your posts that it is possible to get different outputs in windows 7. i am eager to know more. Is there any way i can create a 2 or more virtual cable between two softwares simultaneously. so that simultaneously, two or more audio inputs will be routed to equal no of audio analysers receivers, and then the audio analysers send back a filtered audio back to respective audio inputs... Please reply to email id: [email protected]

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  • How do I stop VMware player from resizing?

    - by Sean
    Hi! I just downloaded VMware player (I used to use Virtual Box, but I needed Windows Aero, and vbox doesn't support that yet) But it will automatically resize the guest when I resize the window, and I do not want that. I did not see an option to turn it off. Does anyone know? Thank you.

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  • Need for page file with 12 GB RAM

    - by MartinStettner
    Hi, I recently got my new PC with 12 GB RAM (running Windows 7 64bit). The default installation suggests a 12 GB page file on the system drive (which I think is both inefficient and expensive on a SSD drive...) I'm wondering if I need any virtual memory at all, 12 GB being more than I had on my previous machine including the page file (I had 3GB RAM + 3GB pagefile). Thanks Martin EDIT As mokubai pointed out, the question is pretty much answered in Windows 7 pagefile size with large RAM and SSD

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  • Virtual Private Hosting DNS configuration

    - by Ciel
    I did a great deal of reading here before posting this because I didn't want to post a duplicate - but I'm on a bit of a deadline and getting frustrated, so here goes... I very, very, very sincerely apologize if this is long winded or hard to read. Please - please just ask for any information or clarification and I will give it as quickly as I possibly can. This has become very frustrating to me and this is the last place I know to turn. I have no experience with setting up DNS, no experience with nameservers, and no peers to go to for help. So this is kind of my last ditch effort. The task of setting up a private server has, through circumstances beyond my control, fallen into my lap. I own a domain (hereafter referred to as yyy.com) and have always used shared hosting - I buy a package and just point it to the domain nameservers they give me. It's always been simple. yyy.com is registered with network solutions Now I have purchased a Virtual Private Hosting package from GoDaddy.com - and it comes with Plesk 11. I have no earthly idea how to begin to get the right nameserver for yyy.com. I have gone through the instructions and have wound up exceedingly frustrated. I have 2 IP addresses from GoDaddy for the server. This is what I have so far, and I cannot tell if it is working (Since propogation takes so long, it is extremely hard to test for me) IP 1 : XX.XX.XX.XX IP 2 : YY.YY.YY.YY (obviously hidden for privacy) Now after going through the documentation setup and waiting a few days, this is the setup I have - and so far it does not appear to be working. Host Record type Value XX.XX.XX.XX / 24 PTR yyy.com. yyy.com. NS ns1.yyy.com. yyy.com. A XX.XX.XX.XX yyy.com. MX (10) mail.yyy.com. ftp.yyy.com. CNAME yyy.com. ipv4.yyy.com. A XX.XX.XX.XX mail.yyy.com. A XX.XX.XX.XX mssql.yyy.com. A XX.XX.XX.XX ns1.yyy.com. A XX.XX.XX.XX ns2.yyy.com. A YY.YY.YY.YY webmail.yyy.com. A XX.XX.XX.XX www.yyy.com. CNAME yyy.com. yyy.com is pointing to both ns1.yyy.com and ns2.yyy.com Can anyone give me some assistance here? This is a learning experience for me and days of documentation have left me very confused.

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