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How to get rid of "Notice: trying to get property of a non-object" errors in PHP
by Chris Green 15 Jun '12

15 Jun '12

I'm trying out a chunk of downloaded software and it's actually quite close to what I want. However it's outputting *hundreds* of "Trying to get property of non-object" errors which are somewhat distracting as there are more of them than actual data. I'm pretty sure the reason they're appearing is because the code is accessing lots of values before they're created (and presumably doing the right thing when they're null). It's not just in one place in the code so I can't very easily go and change the code at every place this is happening. Is there a way to turn of this particular warning? I'd rather not turn of all warnings and I'd rather do it just for this application rather than everywhere (I want to see warnings on code I've written!). -- Chris Green

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[ALUG Announce] ALUG Norwich Pub Meet Thursday 14th June
by Viperfang 14 Jun '12

14 Jun '12

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- Hello Norwich Aluggers, Our monthly ALUG Norwich social meeting will be held this Thursday, 14th June at The Coach and Horses (82 Thorpe Road, Norwich, NR1 1BA). The meeting officially starts at 8pm, although some people may arrive earlier. More information on those people can be found on the list and the IRC channel. If you are unsure if you will recognise us then make yourself and your intent to attend known by either posting on list or visiting us on IRC so we can look out for you rather than hiding in the corner. Optionally you could ask at the bar if they know where the geeky computer weirdos are and they'll point you in the right direction (seriously!). Another possibility is look for heaps of electronics on a table that may possibly look like movie props that would used for detonating explosives. Feel free to bring electronics/laptops/gadgets to the meet, you will by no means be alone. Ben Bewick aka Viperfang NB: This mail is automated, please refer to the usual sources for more information. ALUG Contact Details: Website : http://www.alug.org.uk/ IRC : #alug on irc.alug.org.uk List : http://lists.alug.org.uk/mailman/listinfo Twitter : http://twitter.com/anglianlug Identica: TBA Facebook: http://www.facebook.com/group.php?gid=2381613902 ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

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Linux Mint 12 Wireless Issues
by Paul Grenyer 13 Jun '12

13 Jun '12

Hi All I've a new Lenovo T520 and I've installed the latest Linux Mint on it, but the wireless is painfully slow. I can't even log into my router's admin page. If I reboot into Windows 7 the speed is fine. I haven't tried a wired connection yet. I'm hoping that the wired connection is fast and might update some drivers as part of the general update process. However, if that doesn't work, I really don't have a clue where to start. The wireless adapter in the T520 is an Intel Centrino Wireless-N 1000. Can you guys give me any pointers, please? -- Thanks Paul Paul Grenyer e: paul.grenyer(a)gmail.com b: paulgrenyer.blogspot.com t: pjgrenyer ACCU Member: License to code. (http://www.accu.org)

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Scientific Linux
by Ted.Harding＠wlandres.net 13 Jun '12

13 Jun '12

Hi All Anyone using Scientific Linux? Not that there's anything specially scientific about it in its generic form. It's basically a clone of Red Hat Enterprise Linux, and it's called "Scientific" because it was put together by FermiLabs and CERN. See: http://en.wikipedia.org/wiki/Scientific_Linux and https://www.scientificlinux.org/ I'd be interested to hear of experiences with it (especially from anyone who has installed scientific extras). Ted. ------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)wlandres.net> Date: 12-Jun-2012 Time: 23:04:55 This message was sent by XFMail -------------------------------------------------

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How would the team produce a simple web page with a running balance/total on it?
by Chris Green 12 Jun '12

12 Jun '12

I've wanted to do this at several different times and places, some of my solutions are OK'ish but I've not really come up with something neat and tidy for doing it. I want a simple (for the user, and preferably for me too in creating it) web page where a user can enter an amount, probably with a date and a description, that gets added to (or subtracted from) a running total. The user can also see the list of transactions that contributes to the current total. I.e. I want something that looks like a bank statement but can be changed easily on the web page itself. So we'd have something like:- Date Descritption Credit Debit Balance 2012-01-01 Start of year 1234.00 1234.00 2012-02-14 Valentine Pres 12.34 1221.66 2012-03-01 Paid for joke 99.00 1320.66 etc. Plus either a blank line at the bottom of the table to enter new values, or some edit boxes to add new values. There's lots of online spreadsheets out there but since they all tend to be Excel lookalikes they don't do running balances very easily, you have to keep re-entering the balance calculation in the balance column, there doesn't seem to be any easy way to say a column is a calculated value that is always the same calculated value (or at least I've not found it). My implementations so far have either used a database with a very nasty complicated calculated value in the Balance column (that depends on the ordering of the date column which isn't always a good idea if there's more than one entry on the same date) or uses a plugin I have developed for my Wiki which requires the user to edit the wiki page - OK for me usually but not very good for other users. Any bright ideas anyone? Doesn't actually have to be web accessible as it will only have one or two users for each instance so could be done with a dedicated application and a shared file for example. -- Chris Green

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Email clients! - Alpine... anyone use it?
by James Freer 04 Jun '12

04 Jun '12

For a while i've just used the browser for email having found Thunderbird, Evolution and similar so slow on imap. Mutt i managed to set up but being so configurable wasn't to my liking. Alpine seems the fastest of any i've tried... easy to setup - just wondering if anyone else on here uses it. If they do any problems? jmaes

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Multi-VPN configuration
by Mark Rogers 04 Jun '12

04 Jun '12

I always get into a muddle when I try to set up VPN connections but I'm going to have another go.. What I have is lots of Linux "devices" (typically ARM boxes running Debian) which will be plugged into networks giving them Internet access. What I want to achieve is to have them auto-connect to a VPN, such that I am able to access all of them, but also that the end user can connect to their own devices but nobody elses. Ideally I'd also like other VPN capable devices, such as Draytek routers, to be able to join in the party. My starting point - which may well be wrong, is to assume that I want a server running OpenVPN somewhere on t' Internet. (Is that the right place to start?) I find the OpenVPN documentation to be very detailed but hard to narrow it down to any particular usage case unless it's a standard config (eg "road warrier"). What I don't want at my end is to *have* to connect separately to each VPN. Doing so optionally would be good (but would be possible in the same way an extra device could), but it could be I end up with dozens or hundreds of separate segregated VPNs. Furthermore, it's likely that I will want all of the VPNs to have access to certain facilities (eg databases, FTP) on other servers without having to make the other servers join multiple VPNs. -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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How to print stupid Royal Mail price list?
by Chris Green 01 Jun '12

01 Jun '12

The Royal Mail used to provide a neat PDF file which fitted A4 to show their postage prices. The latest version though is a 'booklet' so I can't see any way to actually print it on an A4 printer. This is the link to the PDF:- http://c435158.r58.cf3.rackcdn.com/Royal_Mail_Our_Prices.pdf Can anyone tell me how to split it up into printable pages? I've tried ImageMagick's convert but that didn't default to what I wanted, maybe I need some more options to tell it what to do. -- Chris Green

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Programming question - different approaches to classic command parsing
by Chris Green 29 May '12

29 May '12

Well my Nanode project is progressing (it's the one that has the rather idiosyncratic ethernet handling). The next question is whether to rejig the basic command handling. The Nanode software I'm maintaining/improving is basically very simple, after initialisation it waits for an ethernet UDP packet with a command code and data in it, then it acts on the command and returns (via UDP again) some sort of response. There are currently 34 commands, this will expand somewhat but is unlikely to ever be more than 100 or so. The existing code simply has a switch/case block switching on the command code with the cases handling each command. It's a bit long but is manageable. I'm wondering whether to stay with the existing structure or to go to some sort of table driven approach with an array of something like:- // // // Command table entry structure // struct command { uint32_t cmd; // the command code int (* fnc) (int addr); // the address of the function to call char * str; // the associated LCD string }; (obviously the function parameters may extend/change) A linear search of an array of these won't waste much time, speed isn't of great consequence anyway. Then each command will be a function, tidier and more modular, but will it actually win me anything (or lose anything)? In particular will it use more space, in code or RAM? In code there will be, say, 50 function calls plus a table instead of a switch statement with 50 case: blocks. In RAM there will be lots of smaller functions using a small amount of stack space instead of one big one with lots of local variables. This is using the gcc-avr compiler by the way. My gut feeling is that it probably won't make a big difference either in code space use or in RAM use but it will probably use a little bit more of both. The question then is whether the significant amount of rewriting is worth it for the more elegant (and hence easy to maintain) code. If there's another approach to managing this sort of command driven interface then I'd be interested in hearing about it. -- Chris Green

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Re: [ALUG] Ethernet programming question
by Phil Ashby 28 May '12

28 May '12

Chris Green <cl(a)isbd.net> wrote: > I'm doing some programming of a Nanode board (not far removed from > Arduino) which has an ethernet interface based on the ENC28J60. > ... > However the loop that waits for ethernet packets and deals with them > seems a bit odd to me, in psuedo-code it's something like:- > > while (not reset) > { > get a packet from ethernet > > handle DHCP message > > handle message requesting local display on LCD > > handle ARP request > > handle DNS request > > handle NTP request > > if (still something left) > { > if (ping) > { > respond to ping > } > if (UDP message for us) > { > handle our message > } > } > } > > > What I'm not clear about is whether one packet can only be one of the > above things. Hence, if a DHCP request of some sort has been received > and handled can the *same* packet contain other requests? If not then > why is the code going through all the other calls? Hi Chris - you are correct in assuming that one packet can only be one thing, since a combination of packet type fields (Ethernet frame type, IP frame type, TCP/UDP port number) determine this. > OK, it makes for simpler looking code, no conditionals and/or > switch/case but it somehow seems wrong (and a bit inefficient as each > handle function gets called even if the packet has already been > handled). Just been and looked at the code in github for the Nanode Ethershield and all I can say is yuk! https://github.com/Nanode/EtherShield/blob/master/ip_arp_udp_tcp.c I quote: "The TCP implementation uses some size optimisations which are valid only if all data can be sent in one single packet. This is however not a big limitation for a microcontroller as you will anyhow use small web-pages." Hmmn. I found the code confusing, badly structured and incomplete (eg: it doesn't work if IP options are sent and there is nothing like the full TCP state machine with various timers, backoff controls and such, only a happy path). Of course I may have been looking at different code - got a URL? Phil. PS: http://code.google.com/p/avr-uip/ looks rather better!

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