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• What maintenance is required for a Postfix setup?

  - by JonLim

  I've taken a look at the setup and configuration process for a Postfix server, planning to use it for just sending emails out from my server. So far, I have these steps: Setup Postfix Configure Postfix Install DKIM Set SPF records Tune for performance Debug Seems rather straightforward. However, I was just wondering: are there any actions I should be taking for periodic maintenance of my Postfix setup? Thanks! EDIT: Also, just curious, how long would this entire setup ideally take? 30 - 60 minutes? More?

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• Iterating through std queue

  - by Ockonal

  Hi, I'm trying to use BOOST_FOREACH for iterating through the std::queue. But there isn't iterators in that class cause I have an error: std::queue<std::string> someList; BOOST_FOREACH(std::string temp, someList) { std::cout << temp; } >no matching function for call to begin(...) >no type named ‘iterator’ in ‘class std::queue<std::basic_string<char> >’ I need in structure like: the first comes, the first goes away.

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• How to download the xml file from server and use it inside application ?

  - by Praween k

  Hi Commonware, As you provided the solution .Actually my application requirement is exactly matches as you told i.e first download it from server and then display the file and it should also be updated as per the server file is updated within running period.Can u please provide me the application code for this .This will be very much helpful.I need it Urgently!!!!!!! [If it blows up, you will either need to split it into multiple files (each with a subset of your data), or not package it with the application, instead downloading it from a server on first run of your appl.] Thanks in advance. Praween

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• How do I arbitrarily reorder lines in a text file using a Unix shell?

  - by Tim Bellis

  I've got a text file with an arbitrary number of lines, e.g.: one line some other line an additional line one more here I'd like to write a script to reorder those lines based on a given order. e.g. An input of 2 1 3 4 would swap the first and second lines. An input of 3 1 2 4 would put the 3rd line first, the 1st line second, the 2nd line third and keep the 4th line fourth. I could hack something together, but I'm wondering if there's an elegant solution? I can use either bash or ksh.

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• pre tag is being formatted strangely in page

  - by morpheous

  I am outputting some code in one of my pages, using a <pre> tag. The code is being output correctly, but for some strange reason, the first line of the code is indented (i.e. shifted to the right, by quite a large amount). I am not applying any style to that element, and I checked in FF Firebug and no styling is being applied, so I have no idea why the first line is shifted by so much to the right - any ideas? the code that generates the tag looks like this: <pre> <?php echo $script_code; ?> </pre> The generated code looks like this: <iframe src="http://www.example.com"> </iframe> Any ideas what may be going wrong?

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• How to add network printer remotely without knowing the IP?

  - by Steve

  Assume your friend from over 100km away asked you to add a network printer to his computer since you're so tech savvy. How would you add network printer remotely in this case? You would need: 0. Remote connection to your friend's computer 1. Printer IP and brand/model names 2. Respective drivers downloaded either from manufacturer's website or Windows Update driver Question is, how would you find out the IP address of the printer without bothering your friend too much with technical steps? Since your friend isn't as tech savvy as you - they wouldn't know which buttons to press to get IP address.

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• read successive frames OpenCV using cvQueryframe

  - by AtharvaI

  Hi all I have a basic question in regards to cvQueryFrame() in OpenCV. I have the following code: IplImage *frame1,*frame2; frame1 = cvQueryFrame(capture); frame2 = cvQueryFrame(capture); Now my question is: if frame1 is a pointer to the first frame, is frame2 a pointer to the 2nd frame? So will the two cvQueryFrame() calls read successive frames? I thought I'd check myself first but the pointers frame1,frame2 seem to have the same hex value. :s I just need to capture two frames at a time and then need to process them. Thanks in advance

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• iPhone Saving File

  - by Kashif

  Hi, to every one, i am doing xml parsing and i am getting two text files from the server with contents i have stored the contents of the first file document directory however when parsing function call second time the contents are overwritten by second file, i don't know how to create two txt file in document directory for two different contents paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); documentsDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Report.txt"]; [text writeToFile:documentsDirectory atomically:NO]; [text release]; I HAVE TAKEN THE CONTENT FOR THE FIRST FILE WITH THIS METHOD.

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• How to give 'Everybody' full rights to a file (programmatically)

  - by egrunin

  I'm modifying an old C++ program to run on Vista. It does not require Admin privileges. I've changed the code to put logfiles in \ProgramData\MyApp\. These logfiles are written with the stdio functions (fopen, fprintf, fclose). Here's the problem: UserA runs the program first, it creates \ProgramData\MyApp\MyLogFile.txt UserB runs the program next, it tries to append to MyLogFile.txt and gets access denied. I tried creating a null SECURITY_DESCRIPTOR and passing that to CreateFile(). That does create a file with "no permissions assigned", but it seems as if the first user to write to the file takes ownership and afterwards all the other non-admin users are out of luck. It's important that all users share the same logfiles, but it's also important that I change as little code as possible.

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• How to setup Microsoft Remote Desktop?

  - by jsoldi

  I'm trying to establish a connection between this app and my Win 8.1 Pro PC, but every guide I've found so far skip steps such as what to put under PC name or under Gateway. Also, should the User name be my email or something else? I've also no idea how to find or add a user in the step 6 of this guide because the only location listed is my PC and I don't even know what am I supposed to search for. I'm not even sure whether I have to add a user or this is an step I can skip. A comprehensive guide for people without experience in networking would be highly appreciated. Both my android tablet and PC are connected to the internet through a home router, in case this matters.

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• Ctrl-Alt-F1 never gives prompt

  - by nispio

  When I press Ctrl+Alt+F1 in my Red Hat Enterprise Linux 6.4 (Santiago) I get a black screen with a blinking cursor, but I never get a login prompt. I can get back to my desktop with Ctrl+Alt+F7, and things work as normal. However, when I run sudo init 3 I get the same thing, but this time I am stuck at the screen and can't get back without a reboot. I'm not even sure where to start looking for the cause of this problem. Are the startup scripts that might be causing the problem or other system configurations that could lead to this? If this is not an known issue, what steps should I take to debug?

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• Does Core Data automatically validate new values when they are set?

  - by mystify

  In this question, someone asked how to write a validation method for Core Data. I did that, and it looks cool. But one thing doesn't happen: The validation. I can easily set any "bad" value and this method doesn't get called automatically. What's the concept behind this? Must I always first call the validation method before setting any value? So would I write setter methods which call the appropriate validation method first? And if yes, what's the point of following a strict convention in how to write the validation method signature? I guess there's also some automatic way of validation, then. How to activate this?

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• How does C free() work?

  - by slee

  #include <stdio.h> #include <stdlib.h> int * alloc() { int *p = (int *)calloc(5,4); printf("%d\n",p); return p; } int main() { int *p = alloc(); free(p); printf("%d\n",p); p[0] = 1; p[1] = 2; printf("%d %d\n",p[0],p[1]); } As to the code segment, I allocate 5 ints,first. And then I free the memory. When I printf p, why does p sill have a value same to the memory address allocated first? And I also can assign value to p[0] and p[1]. Does this mean free() do nothing? Once I allocate memory, I can use later though I have freed it.

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• Cannot to change my root password on Xenserver

  - by Michlaou

  I try to change my root password on my Xenserver 6.0. I follow these steps: enter boot: menu.c32 selecet xe-serial and press tab add "single" before the 2nd triple hyphens and i press enter. I have that: mboot.c32 /boot/xen.gz com1=115200,8n1 console=com1, vga mem=1024G dom0_max_vcpus4 dom0_mem=752M lowmem_emergency_pool=1M crashkernel=64M@32M single --- /boot/vmlinuz-2.6-xen root=LABEL=root-rodraxar ro console=tty0 xencons=hvc console=hvc0 --- /boot/initrd-2.6-xen.img I have commande on the screen and it's stop at: ext3-fs: monted filesystem with ordered data mode. Can you help me?

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• titleForHeaderInSection is not updating Section Header information correctly

  - by Jim

  I have two tableviews where one navigates to the next. Both use more or less the same code and use the managedObjectContext and FetchedResultsController design pattern to provide the relevant data for both tables. My problem happens when I navigate from the first to the second tableview and the data has only one Section Header / Row in the tableview. The data will then not update Section Header information. It does when there is more than one row but not if there is only one row. It leaves the information from the first attempt in place. I can confirm the row data is correct so the relevant data should be being passed to the Section Header correctly but it isn't. Has anyone else come across this problem?

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• Windows 7 64 bit will hesitate and the screen will go black

  - by jondrnek

  I am running windows 7 64 bit with 2 monitors. Several time a day the system will freeze up for about 5 seconds and the screens will go black. After the 5 seconds are up, the system continues to function properly. I get no error messages that pop up and all the applications I am running handle it fine. All the devices appear fine, my drivers are up to date and nothing is jumping out at me in event viewer. What are the next troubleshooting steps I can take?

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• imageview draw issue with asynctask

  - by alexb

  Have the following asynctask that i'm using to download some images. Works fine except for the very first image, which doesn't always appears unless I do something like move to the next image and then back again. public class DownloadImageTask extends AsyncTask { static ImageView _imageView=null; public DownloadImageTask(ImageView ctl){ _imageView=ctl; } protected void onPostExecute(Bitmap result) { _imageView.setImageBitmap(result); } ... } I thought this might be an issue with updating the UI on a background thread, so I reworked this using an abstract class that invokes a method on the UI thread that calls .setImageBitmap() but I still get the same behaviour - works fine for all images except the first, unless I move to the next image and back again. Is there a way to force a redraw on the imageview after i set the image?

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• jquery find child

  - by Sir Lojik

  hi all, ive got a jquery DOM traversing problem... i would like to get the first div (child) of li with id='wpc_pics2840' from the markup below. ie <div class="ui-btn-inner"> <li id="wpc_pics2840"> <div class="ui-btn-inner"> <div class="ui-btn-text"> <a href="#" class="ui-link-inherit"> <img width="40" height="40" src="http://www.veepiz.com/members/jimmydeantony/media/443_thumb.jpg" class="ui-li-thumb ui-corner-bl"> <div style="font-size:9pt;font-weight:normal;">upload a bigger picture....</div> </a> </div><span class="ui-icon ui-icon-arrow-r"></span></div></li> btw, please dont say something like $('.ui-btn-inner')... its got to be the first child div of element with id='wpc_pics2840'

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• Prevent Excel from evaluating unneeded expressions in OR()

  - by Wesley

  IF(OR(ISNA(MATCH(8,B10:B17,0)),MATCH(8,B10:B17,0)>8),"",...BLAH...) I understand how to fix this problem by rearranging my formula. I have it the way it is to show this point. You can see the OR() statement checks to see if the first MATCH() returns NA. When it does, OR() should automatically return TRUE and not evaluate the second MATCH() because conditions have been met for the OR() to return true no matter what other arguments there are. You'll notice that the first and second MATCH() functions do the same thing. What's happening is the entire function is returning NA because the second MATCH() is executing even though it doesn't have to, the OR() has been satisfied with one TRUE, therefore the function should return "". Is this a bug or is this intentional?

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• how to use same string in two java files

  - by Palike

  Sorry for my bad English and for maybe stupid question but I'm new in Java. I need use same string in 2 java files for example: In first java file I've got code for sending emails, I've got string set to default email: public String mail = new String ("[email protected]"); and I use this string in code for send email: email.addTo(mail); In second java file something like set up where can user set new email address I want to have same string, connected with string in first java file. When user put new email String mail will be change to new email address and in email.addTo(mail); will be use this new address How can I do this?

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• PHP, PEAR, and oci8 configuration

  - by zack_falcon

  I'll make this quick. I installed Oracle 11g (with appropriate database, users, etc), Apache 2.4.6, and PHP 5.5.4 on a Fedora 19 system. I wanted to connect PHP to Oracle. What I really wanted to do was to download MDB2_Driver_oci8, which I thought would be easy, but before I can do such a thing, PHP needs to have that plug-in enabled, so here's what I did: Tried to install oci8 via the following: pecl install oci8 When that didn't exactly work the first few times, I figured out I, for some reason, needed "Development tools" - via yum groupinstall "Development Tools" Then I figured out later that PHP actually doesn't do oci8 - it's PHP Devel. So, I had to install that too, via yum install php-devel. And then, I finally got to install oci8. It asked for the Oracle Directory, and that was that. But it said the following: Configuration option 'php_ini' is not set to php.ini location You should add 'extensions=oci8.so' to php.ini First, I did a locate oci8.so - found it in /usr/lib64/php/modules/ Second, I added what it told me to, to the php.ini file. Third, I checked the usual php_info() test page - no mention of OCI8. Uh-oh. Fourth, running both php -i and php -m listed oci8 as one of the modules. Weird. In desperation, I went ahead and downloaded the MDB2_Driver_oci8. Maybe that will fix things. Nope. When I loaded my PHP Webpage, it returned the following: Error message: extension oci8 is not compiled into PHP As well as: MDB2 error: not found Strange. And then I decided to check the error logs: PHP Startup - unable to load dynamic library '/usr/lib64/php/modules/oci8.so' - libclntsh.so.11.1: cannot open shared object file: No such file or directory in Unknown on line 0 And now I'm stuck. I tried going into the php.ini, and found that the extension_dir was commented out. I put it back in, which only seemed to break stuff. Things of note: I followed this (link) guide on how to configure PHP and install oci8. ./configure --with-oci8 doesn't work. Fedora says no such directory. As both the webpage files and the actual server reside on the same PC, I did not install the Oracle Client files. The extension_dir is commented out by default in the php.ini. This is just one of my problems in a long line of problems concerning the replication of an already existing and working, but dying, setup. It seems whenever I want to solve a problem, I have to do X first. And by doing X, I uncover another problem, which I have to solve by doing Y, which has its own problems, etc, etc. Any help would be much appreciated. Thanks.

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• Why do I get a PHP 5.2.6 segmentation fault when using PDO_SQlite?

  - by danieltalsky

  This is an installation on ModWest's shared hosting. I have enabled both PDO and PDO_sqlite on the server and phpinfo() verifies both are running. When I access PDO itself, I'm fine, and getting a meaningful error. <?php $dbh = new PDO(""); ?> This gives me an "Invalid Connection String" error. But, as soon as I begin a connection string with sqlite:, I get a total crash. When I run via the webserver, I'm seeing NO error. When I enter a nonexistant filename, PHP does indeed create the file. I tried running the constructor via CLI and there I do get a simple error: Segmentation Fault I'm not seeing ANYTHING in the PHP 5.2.6 changelogs about this bug. Anyone have any additional troubleshooting steps? The OS is Debian 5.0.4

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• fetch some data from two tables

  - by user1753971

  i have site like imdb and we provide movie information sin site..and our website have option to rate all movies for every users. I have two tables 1 . imdb (its for store movie details) id,name,actors,vote 2. ratings (its for store users rating details) id,rating_id(its same as id from first table),rating_num,IP now what am doing is..when anyone rating a movie take the avg of that movie rating by using rating tables (total ratings/number of ratings) and insert that value into "vote" column in first table..my demands this..thats why done like this.. Now my problem is..i want to fetch top rated movies..i mean in vote column which movie have top rating which want to list and one more condition is that that movie should rated by 10 users(use ratings table for that) thanks in advance

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• A brief question about JS or AJAX

  - by Luke

  I have been finding ways around this for a long time but think it's time I addressed it. If I have a page that has a dropdown menu, is there anyway I can select a value which will subsequently load other values further down. Can this be done without a page reload? I will give you an example. Say I was making some tools for an admin panel, but first of all they needed to select a member to work with. They would select the member and then below, the fields about that member would be populated based on what was selected in the first menu. As I have already asked, can this be done without a page reload? Thanks for reading.

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• averaging matrix efficiently

  - by user248237

  in Python, given an n x p matrix, e.g. 4 x 4, how can I return a matrix that's 4 x 2 that simply averages the first two columns and the last two columns for all 4 rows of the matrix? e.g. given: a = array([[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]) return a matrix that has the average of a[:, 0] and a[:, 1] and the average of a[:, 2] and a[:, 3]. I want this to work for an arbitrary matrix of n x p assuming that the number of columns I am averaging of n is obviously evenly divisible by n. let me clarify: for each row, I want to take the average of the first two columns, then the average of the last two columns. So it would be: 1 + 2 / 2, 3 + 4 / 2 <- row 1 of new matrix 5 + 6 / 2, 7 + 8 / 2 <- row 2 of new matrix, etc. which should yield a 4 by 2 matrix rather than 4 x 4. thanks.

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