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  • DNS lookup fails when forwarding to subdomain

    - by Kitaro
    In order to migrate to a new mailserver with little dns problems/downtime, I have set up a second postfix that is currently accessible on a subdomain mx record, eg. the main postfix accepts mail for [email protected] while the second postfix also accepts mail for [email protected]. I added a forwarding rule to postfix saying that postfix should forward mail destined for [email protected] to [email protected] (for regular local delivery) and to [email protected]. Local delivery still works as expected, but when trying forward the mail to the new mx, postfix appeds the domain part at the end of the forwarding address, resulting in [email protected], which of course fails and the mail bounces. Why does postfix mess with the alias name in that way and how can I turn that of?

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  • When does n++ execute faster than n=n+1 ?

    - by gcc
    Related: http://stackoverflow.com/questions/24853/c-what-is-the-difference-between-i-and-i In C language, Why does n++ execute faster than n=n+1? (int n=...; n++;) (int n=...; n=n+1;) Our instructor asked that question in today's class. (this is not homework)

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  • UnicodeDecodeError in pyton 2.7

    - by user2913962
    i try to write this code to process Arabic language by python import codecs file = codecs.open("C:\Python27\CCA_raw_utf8.txt","r","utf-8") text= file.read() #################################### print "\n "," --------------------------------------------" text=text[1:] words=text.split() for w in words: if w == unicode ("?????","utf-8"): print w but it doesn't and take error " if w == unicode ("?????","utf-8"): UnicodeDecodeError: 'utf8' codec can't decode byte 0xc7 in position 0: invalid continuation byte " why program gives this result and how we can correct that??

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  • Qt/C++ or C#, which learn first??

    - by myax
    I already know C++ console programming. So shall i learn Qt for c++ or c# first?? I eventually plan to learn both anyways. Also, how long will each one take. The only programming language i know is c++.

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  • New to PHP, need book recommendations

    - by bran
    Hey guys, I need few good book recommendations for PHP. I am trying to learn to develop webapps. I know there are other (arguably) better language out there that I should start with (ie, python). But I want to start with PHP and go from there. My programming knowledge is limited to html/css (I know they are not actually programming languages), and I have gone through half of a python book. Thanks! :)

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  • Operation precedence on postgress

    - by user24691
    I have set new division on postgress pg_operator table because i want tath when is division by zero return 0. i have write this: create operator / ( procedure = zero_division, leftarg = double precision, rightarg = double precision); where zero_division is: CREATE OR REPLACE FUNCTION zero_division(double precision, double precision) RETURNS double precision AS 'select case when $2 = 0 then 0 else $1 / $2::real end;' LANGUAGE sql IMMUTABLE COST 100; when i run value/ 0 i get error of division.

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  • Worst aspect of Python for a newbie

    - by schickb
    I'm wondering specifically what experienced programmers thought when they started developing in Python. I'm sure the answer depends on your background, but my own personal answer is the conversion of basically anything in the language to a True/False value in boolean contexts. Resulting in "oddities" like: if x: not meaning the same thing as: if x == True: I understand why, but it bugs me, and I certainly had to think about it a bit when I first ran into it.

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  • What is the 'accumulator in HQ9+?

    - by Koning Baard XIV
    I was just reading a bit about the HQ9+ programming language ( http://esolangs.org/wiki/HQ9 , http://en.wikipedia.org/wiki/HQ9%2B and http://www.cliff.biffle.org/esoterica/hq9plus.html ), and it tells me something about a so called 'accumulator' which can be incremented, but not be accessed. Also, using the + doesn't manipulate the result: code H+H result Hello World Hello World Can anyone explain me how this works, what this does and if it even makes any sense? Thanks

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  • Which do I select - Windows Azure or Amazon EC2 - for hosting unmanaged C++ code?

    - by sharptooth
    We have a server solution written entirely in unmanaged Visual C++. It contains complicated methods for really heavy data processing. The whole thing contains millions lines of code, so rewritning it all in some other language is not an option. We could write some extra code or make isolated changes, but rewriting everything is out of the question. Now we'd like to put it on a cloud. Which platform do we choose - Amazon EC2 or Windows Azure - and why?

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  • Why are browsers so heavy?

    - by Kaivosukeltaja
    Back in 1998 I had a computer with 233MHz Pentium MMX CPU and a GFX card with no 3D acceleration. It was able to run games like Quake II at a decent FPS rate. My current computer has tons more performance and a mid-class GPU, yet struggles to reach 20 FPS when rendering a single model inside a skybox with WebGL. Even regular pages with lots of 2D CSS animations bring many modern computers to their metaphorical knees. As a web developer I understand there's a lot going on in a web page but not what makes it that heavy. Modern browsers compile JavaScript to CPU native machine code before running it and rendering into a canvas element shouldn't trigger DOM rebuilds so theoretically it should be a lot faster than it is. What am I missing here and is it possible to avoid or minimize whatever is making the browsers slow to build more efficient websites?

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  • Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask?

    - by Kyle Brandt
    How can I become an expert at writing mod_rewrite rules? What is the fundamental format and structure of mod_rewrite rules? What form/flavor of regular expressions do I need to have a solid grasp of? What are the most common mistakes/pitfalls when writing rewrite rules? What is a good method for testing and verifying mod_rewrite rules? Are there SEO or performance implications of mod_rewrite rules I should be aware of? Are there common situations where mod_rewrite might seem like the right tool for the job but isn't? What are some common examples?

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  • difference between C(gcc 4.3.2) , C 99 strict(gcc 4.3.2) , C++(gcc-4.0.0-8) ,C++(gcc-4.3.2)

    - by user1139048
    I have the following questions concerning the differences between the four options: What is the main difference between the four options? Which of the above support int64_t or long long without suffix LL. I want a data type of the range 2^63 - 1 If your answer to my second question is not C(gcc 4.3.2) , whether the code I write in C(gcc 4.3.2) for C language will be valid in rest of the three options or do I have to modify something, then what will be those modifications.

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  • Sync two external harddrives?

    - by acidzombie24
    A little mishap happened earlier today and i am thinking i should have a copy of my external harddrive since 10% of it is very valuable. What is the best solution to keep two external harddrive in sync? i'll probably use one as regular and maybe use the other only to copy data. The easiest way to keep it in sync is to clear one drive and copy the other but 1T of data will take a long time. Whats a good existing app that will keep them in sync? freeware preferred.

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  • python: list manipulation

    - by Jason S
    I have a list L of objects (for what it's worth this is in scons). I would like to create two lists L1 and L2 where L1 is L with an item I1 appended, and L2 is L with an item I2 appended. I would use append but that modifies the original list. How can I do this in Python? (sorry for the beginner question, I don't use the language much, just for scons)

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  • Custom font in iPhone Development

    - by Sreelal
    Hi, I am developing an iPhone application which needs to show some font in language other than English like Malayalam or Arabic. Is it possible to do that? Please give me appropriate direction to do this. Thanks in advance.

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  • How to copy a ram_base file to disk efficiently

    - by Hui Jin
    I want to copy a large a ram-based file (located at /dev/shm direcotry) to local disk, is there some way for an efficient copy instead of read char one by one or create another piece memory? I can use only C language here. Is there anyway that I can put the memory file directly to disk? Thanks!

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  • RAID 1 in ubuntu 12.04

    - by Bavly Hanna
    Right now I have a small file server to which I have loaded ubuntu 12.04 desktop on a small 160gb harddrive. This harddrive is the primary drive from which the OS boots. I want to move all my data to my file server so it can be shared on the network (contain in 2x2TB harddrives in my desktop. The 2TB drivers are in raid 1 (hardware). I simply want to move them to the file server and set it up so that they are in software raid 1. If at all possible I'd like to be able to do this without losing any info on the drives. I've searched around and the guides i find describe raiding drives for boot driver, but these wouldn't be boot drives just regular storage drives. If someone could tell me how to perform this or point me in the right direction it would be much appreciated.

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  • How to create a screensaver?

    - by Dave
    Which is the best programming language to use for creating a screensaver? I am thinking of creating a screensaver to showcase projects i have done before for self satisfaction. How should i go about it? Thanks

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  • Where to place a debug log files for my daemon app?

    - by sasayins
    Hi, I am using C language and Linux as my programming platform. I am learning how to create a daemon, and I want to create a log file so that I write a debug message in my daemon. My question is where should I put the log file in my system. Should I put it in the var folder? Please advice. Many thanks.

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  • Prevent acccess to the C drive

    - by Jenko
    Is it possible to prevent regular users from accessing the C drive via Windows Explorer? they should be allowed to execute certain programs. This is to ensure that employees cannot steal or copy out proprietary software even though they should be able to execute it. One way would be to change the option in windows Group Policy and set the "shell" to something other than "explorer.exe". I'm looking for a similar windows setting that just hides the C drive or otherwise prevents trivial access. This is for Windows XP/7.

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