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• Calling class method through NULL class pointer

  - by Adil

  I have following code snippet: class ABC{ public: int a; void print(){cout<<"hello"<<endl;} }; int main(){ ABC *ptr = NULL: ptr->print(); return 0; } It runs successfully. Can someone explain it?

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• Strange UPDATE syntax in MS Access 2003

  - by Sven

  Hi, I've got an Access application with an update query with the following syntax: UPDATE TABLE1, TABLE2 SET TABLE2.VALUE1 = TABLE1.VALUE1, TABLE2.VALUE2 = TABLE1.VALUE2, TABLE2.VALUE3 = TABLE1.VALUE3, TABLE2.VALUE4 = TABLE1.VALUE4 The query is working but I do not understand what's going on here. I'm trying to convert this query to SQL Server. Can somebody please explain what this query does? My guess is that it's a special Access syntax. Thanks, Sven

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• How do i program a simple IRC bot in python?

  - by Jake

  Hi every one. I need help writing a basic IRC bot that just connects to a channel.. is anyone able to explain me this? I have managed to get it to connect to the IRC server but i am unable to join a channel and log on. The code i have thus far is: import sockethost = 'irc.freenode.org' port = 6667 join_sock = socket.socket() join_sock.connect((host, port)) <code here> Any help would be greatly appreciated.

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• Error in ternary expression

  - by Bipul

  Consider the following code which shows compile time error : #include <stdio.h> int main(int argc, char** argv) { int x=5,y=0,z=2; int a=z?x,y?x:(y); // but z?x,y?x:y:z is not showing any error printf("%d",a); return 0; } Please help me explain the reason why z?x,y?x:y:z is not showing any error?

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• static index.html file nginx

  - by Guntis

  We are using nginx with php-fpm. We plan to make first page static (generate html file). if we have 100 concurrent connections, how we can handle file regeneration? basically we need generate new file index_new.html, then delete index.html, and then move index_new.html to index.html. What happens when index.html file was deleted? User gets 404 error? Or nginx handles file from OS cache? One idea is to tell nginx, that 404 error is index_new.html and then not to move index_new to index, but copy. But i don't like idea about 404 error. Thanks.

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• Create netbook recovery image without DVD burner (virtual burner?)

  - by Dan

  I have a new Acer Aspire One which is asking to create a recovery DVD. It doesn't have a built in burner, and I don't have a USB burner. However I do have a large USB hard drive. Is there some way to get the recovery software to "burn" an image file instead of a real DVD? I know you can download a Linux recovery image, but the netbook comes with XP. I plan to install Linux on it but I'd like an XP recovery image just in case.

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• What's the difference between the ruby irb prompt modes?

  - by Steven

  I can change the irb prompt mode with irb --prompt prompt-mode I can see what null and simple does, but I can't tell the difference between null and xmp and the difference between default/classic/inf-ruby. Can someone explain to me what these other modes do? It seems pointless to have multiple modes doing the same thing.

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• Installing CentOS on remote machine.

  - by vijay.shad

  Hi, Can I do a fresh install of centos linux distribution on a remote machine? I have got a machine with windows NT system in a remote location. Now i want to use that system as my deployment machine. To proceed on my plan i need to install a linux os(have chosen CentOS). The guy with machine there is not very much aware of the installation process of any OS. So i thought of the remotely install. Please give me some insight how can i achieve this?

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• javascript function

  - by user295189

  can someone explain what this function is doing var page = new Object(); page.testSearch.btnSearch.setState = function() { this.disable(!(page.testSearch.searchString.value.trim().length > 1)); } thanks

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• How do I tell if my firewire connection is running as 400 or 800?

  - by Tom

  I have a MacBook Pro with FireWire 800 and a freecom external harddrive that has USB3, FireWire 400 and 800. I am using a Nikkai FireWire 800 cable that has 800 connector on one end and a 400 connector on the other end. The 800 connector is attached to the MacBook pro and the 400 connector is attached to the freecom drive. Is there any way to tell what connection has been established? I looked at disk utility and it simply said 'FireWire'. Is there a command-line tool that would give more information? If it's 400, I plan to swap the cable for 800 connector at both ends.

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• Using the standard Flash AS3 scrollbar class

  - by WebDevHobo

  Flash has a scrollbar class, documented here: http://help.adobe.com/en_US/AS3LCR/Flash_10.0/fl/controls/ScrollBar.html However, besides listing functions and variables, there's no real explanation of how to hook an instance of this class to a textfield. Everything I've tried either ends up in errors or the scrollbar not showing. The documentation lacks a clear way of how you should bind the textfield and the scrollbar toghether, and CS4 isn't providing any help either. Can someone explain, or link to an example of how scrollbars work with textfield?

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• sonicwall nsa 240

  - by Adam

  Hi We are looking into putting a hardware firewall into a data center to protect our rack of servers. We are using the servers for terminal services and we have 2 x 1GB connections to the Internet. We have about 50 servers supporting about 250 users which will grow very soon to 500 users. We plan to purchase 2 hardware firewalls to provide HA. Do you think the Sonicwall NSA 240 with Total Secure is a good match for this in terms of performance and protection (from spyware, virus etc?) or is there a better purchase? (Maybe a Watchguard X5 or X8?)

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• What is meant by porting an application X to a platform Y ?

  - by Neeraj

  Pretty clear from the title itself, what is meant by porting an application X to a platform Y? Say for example I have an application X running on some OS, say Y, What do I do to port this application to another OS say Z? Does this mean rewriting a new application A for Operating system Z that necessarily imitates the behavior of application X on Operating System Y. Please explain.

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• [Physics]Why Verlet better then Euler ?

  - by GameProgrammer89

  Hello! Can someone explain me why verlet integration is better then euler ? And why rk4 better then verlet ? I don't understand why it is better method :/

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• PHP Detect if any URL variables have been set

  - by zuk1

  Hey guys, it's kind of hard to explain but basically I want to detect if any variables have been set through the URL. So with my IF statement all of the following should return true: http://domain.com/index.php?m=100 http://domain.com/index.php?q=harhar http://domain.com/index.php?variable=poo&crazy=yes and all the following return false: http://domain.com/index.php http://domain.com/test.php http://domain.com/no_variables.php Any ideas?

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• java dynamic memory allocation?

  - by JavaUser

  Hi, Why an object initialization using " new " keyword is called as dynamic memory allocation since compile time itself we know the memory needed for that object . Also please explain what happen when u do ClassA object = new ClassA(); in heap and stack . Thx

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• Why is "copy and paste" of code dangerous?

  - by Yigang Wu

  Sometimes, my boss will complain us why we need so long time to implement a feature. Actually, the feature has been implemented in other AP before, you just need to copy and paste codes from there. The cost should be low. It's really a hard question, because copy and paste codes is not a easy thing from my point. Do you have any good reason to explain your boss who doesn't know technology?

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• SQL Server plus small files

  - by user1467163

  I have a MSSQL server, 3 volumes, that runs some processes that seem to take way too long. One of these processes reads in a zip file, then writes to a database based on what's in the zip file.... for each record. I have 2 volumes in use and am creating the third- so I am trying to plan how to do this. OS has to remain on vol. 1. The TLogs should probably go on the new volume and the mdf's on the existing vol.2.. Do I put the file store on the volume with the MDF's so they don't interfere with the TLog writes, or with the TLogs so they don't interfere with the TLog flush to the MDFs? I know it's best to have more servers / volumes but I have to make do with whats on hand for now. I appreciate any suggestions.

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• Writing SDK documentation, need useful beginner tutorials

  - by David Rutten

  I'm currently writing SDK documentation for one of our products, but for obvious reasons I don't want to talk about the essentials of OOP. Does anyone know any good online teaching material that explain (aimed at absolute beginners) concepts such as classes, inheritance, constructors, instances etc.? Preferably urls that are likely to survive for a couple of years to come... It's a DotNET SDK and we're including only VB and C# samples, so C++ or Delphi or Lisp material is not that useful.

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• Choosing a home network layout

  - by James M.

  I have a server, 4 PC's, a network printer, a switch and an ADSL modem. Currently the server runs Red Hat 9 and sits between the internet and the other PCs like in http://upload.wikimedia.org/wikipedia/en/1/12/Sample-network-diagram.png I have bought a new server PC to replace the old one, and I plan to install Fedora Core linux on it. The server acts as web and file server. The PCs all run Windows. Alternatively, I could connect the new server and all PCs to the switch, and connect the switch to the modem. (Sorry, couldn't find an image.) What are the pros and cons of these network layouts? Eg. in terms of reliability, security and flexibility? I am not a Linux guru but know of (and am not afraid of) iptables, dhcpd et al. Thank you for any tips, pointers and links.

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• What are the cheap CDN for Origin Pull?

  - by DucDigital

  I've read several thread around ServerFault about this, but still I am not satisfy with the answer so I post a question here. I need a Origin Pull CDN that support big file (more than 200MB). I don't need a storage place since they are too small, just to relay the server. Also the price should be afforable, ofcourse not more than 150$ a month for their smallest plan. I also need to pay by credit card since I do not work or stays in the US so it's hard for me to do a bank wire. Thank you very much

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• How do you determine how long it is taking Apache to forward a request to Phusion Passenger?

  - by dan

  I have a Ruby on Rails website that is serving requests relatively fast within Rails. The completion time for a Rails request is about 130ms. But the request still takes a long time because of the time it takes the Apache server in front of the Phusion Passenger instances to hand off the request to Rails. How can I measure how long it takes Apache to hand off the request to Rails via Passenger? And how can I speed this up if it's slow. Yes, I plan on switching to nginx, but I need a temporary fix.

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• Prevent Windows 7 from unpluging External HDD

  - by marverix

  I have installed Windows 7 as my media server. I pluged in 500GB external HDD via USB. I have changed power plan to Best Performance and changed advenced power settings to never turn off HDD etc. I even yesterday wrote powershell script (create and delete folder on this disk) and I have added it to harmonogram to run every 5 minutes starting from system boot. And nothing! Disk after some time (I realy can't say when) is turning off and Windows show "Unknown Device" in Device Manager. Then only system reboot or disk reboot helps. Any ideas how to prevent Windows 7 from stopping my external HDD? Cheers!

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• Facebook Graph API With iPhone SDK

  - by Tom G

  Hi, Has anyone been able to implement Facebooks Graph API in a native iPhone Application? The documentation is pretty sparse when it comes to iPhone integration, but the calls to get users information looks a lot more light weight than the previous method of using FBConnect. So i would like to use it. I have seen a few posts about but none explain you you would implement the login button as we did previously with FBConnect? If any one has achieved this or can offer me any pointers that would be brilliant Thanks Tom

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• Network backup for Macs and PCs - formatting question

  - by neilfein

  I'm trying to use a LaCie 2TB drive as an AirPort drive, for backup on a home network. We have one mac and two PC laptops. My plan is to create a Mac partition and a Windows partition. However, Disk Utility won't let me set the windows partition to Windows format; there's no option in the menu for it in the partition tab. Am I doing something wrong? Alternatively, is there a way to partition the drive with one partition that all three machines can see? We have a Mac G5 with 10.4 and two laptops with Windows 7. Thanks!

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