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  • [C++] Parent-Child scheme

    - by rubenvb
    I'm writing a class that holds a pointer to a parent object of the same type (think Qt's QObject system). Each object has one parent, and the parent should not be destroyed when a child is destroyed (obviously). class MyClass { public: MyClass(const MyClass* ptr_parent): parent(parent){}; ~MyClass(){ delete[] a_children; }; private: const MyClass* ptr_parent; // go to MyClass above MyClass* a_children; // go to MyClass below size_t sz_numChildren; // for iterating over a_children } (Excuse my inline coding, it's only for brevity) Will destroying the "Master MyClass" take care of all children? No child should be able to kill it's parent, because I would then have pointers in my main program to destroyed objects, correct? Why might you ask? I need a way to "iterate" through all subdirectories and find all files on a platform independent level. The creation of this tree will be handled by native API's, the rest won't. Is this a good idea to start with? Thanks!

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  • C# Function Inheritance--Use Child Class Vars with Base Class Function

    - by Sean O'Connor
    Good day, I have a fairly simple question to experienced C# programmers. Basically, I would like to have an abstract base class that contains a function that relies on the values of child classes. I have tried code similar to the following, but the compiler complains that SomeVariable is null when SomeFunction() attempts to use it. Base class: public abstract class BaseClass { protected virtual SomeType SomeVariable; public BaseClass() { this.SomeFunction(); } protected void SomeFunction() { //DO SOMETHING WITH SomeVariable } } A child class: public class ChildClass:BaseClass { protected override SomeType SomeVariable=SomeValue; } Now I would expect that when I do: ChildClass CC=new ChildClass(); A new instance of ChildClass should be made and CC would run its inherited SomeFunction using SomeValue. However, this is not what happens. The compiler complains that SomeVariable is null in BaseClass. Is what I want to do even possible in C#? I have used other managed languages that allow me to do such things, so I certain I am just making a simple mistake here. Any help is greatly appreciated, thank you.

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  • How to initialize list with parent child relation

    - by user2917702
    Let's say I have the following classes. public class Parent { public string name; IList<Children> children; } public class Child { public string parentName; public int age; } As it is understandable, each parent can have multiple children, and we can have multiple parents. What is the best way to initialize these classes? Is it better to get all of the parents, and all of the children from database then use LINQ? IList<Parent> parents = GetParents()//assume this gets parents from db IList<Child> children = GetChildren() //assume this gets children from db foreach(Parent parent in parents) { parent.children = children.Where(x=>x.parentName==parent.name).ToList(); } or get all of the parents and iterate through each parent to query database by parentName to get children information? Due to requirement that I have, I cannot use datatable or dataset; I can only use datareader. IList<Parent> parents = GetParents()//assume this gets parents from db foreach(Parent parent in parents) { parent.children = GetChildrenByParentName();//assume this gets parents from db by parentName } Thank you

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  • Deserializing child elements as attributes of parent

    - by LloydPickering
    I have XML files which I need to deserialize. I used the XSD tool from Visual Studio to create c# object files. the generated classes do deserialize the files except not in the way which I need. I would appreciate any help figuring out how to solve this problem. The child elements named 'data' should be attributes of the parent element 'task'. A shortened example of the XML is below: <task type="Nothing" id="2" taskOnFail="false" > <data value="" name="prerequisiteTasks" /> <data value="" name="exclusionTasks" /> <data value="" name="allowRepeats" /> <task type="Wait for Tasks" id="10" taskOnFail="false" > <data value="" name="prerequisiteTasks" /> <data value="" name="exclusionTasks" /> <data value="" name="allowRepeats" /> </task> <task type="Wait for Tasks" id="10" taskOnFail="false" > <data value="" name="prerequisiteTasks" /> <data value="" name="exclusionTasks" /> <data value="" name="allowRepeats" /> </task> </task> The Class definition I am trying to deserialize to is in the form: public class task { public string prerequisiteTasks {get;set;} public string exclusionTasks {get;set;} public string allowRepeats {get;set;} [System.Xml.Serialization.XmlElementAttribute("task")] public List<task> ChildTasks {get;set;} } The child 'task's are fine, but the generated files put the 'data' elements into an array of data[] rather than as named members of the task class as I need.

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  • child objects in linq

    - by gangt
    I checked before I posted but couldn't find a solution. I'm new to linq and it is draining my brain to understand it. I have an xml and want to use linq to fill object that has a child object. the xml and my linq is below. My issue is on this line TaskItems = t.Elements("taskdetail").ToList<TaskItem>() //this line doesn't work how do I fill this child object? var task1 = from t in xd.Descendants("taskheader") select new { Id = t.Element("id").Value, Name = t.Element("name").Value, IsActive = Convert.ToBoolean(Convert.ToInt16(t.Element("isactive").Value)) TaskItems = t.Elements("taskdetail").ToList<TaskItem>() }; <tasks> <taskheader> <id>1</id> <name>some task</name> <isactive>1</isactive> <taskdetail> <taskid>1</taskid> <name>action1</name> <value>some action</value> </taskdetail> <taskdetail> <taskid>1</taskid> <name>action2</name> <value>some other action</value> </taskdetail> </taskheader> </tasks> public class Task { public int Id; public string Name; public bool IsActive; public List<TaskItem> TaskItems = new List<TaskItem>(); } public class TaskItem { public int TaskId; public string Name; public string Value; }

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  • Core data, sorting one-to-many child objects

    - by Shizam
    So if I have a store of parents children and the parent has a one to many relationship to children (parent.children) and they all have first names. Now, on the initial fetch for parents I can specify a sort descriptor to get them back in order of first name but how can I request the children in order? If I do a [parent.children allObjects] it just gives them back in a jumble and I'd have to sort after the fact, every time. Thanks, Sam

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  • CNAME subdomain of subdomain with content on first subdomain

    - by BandonRandon
    Okay so maybe that title is a bit confusing but here is what I'm trying to do: I have a subdomain with content at my.example.com I want to set up something like sub.my.example.com This does not seem to work if there is content on my.example.com However if there is not content on the first subdomain it seems that it's okay to CNAME the record to example2.org This is my first real experiance with CNAME so I'm wondering about common errors to check for. my.example.com is an A record and sub.my.example.com is a CNAME EDIT I am managing the DNS though Web Host Manger (WHM) Dns records. The content is at http://vbx.knowconceptdw.net and I'm trying to set a voicemail CNAME to point to http://api.twillio.com at http://voicemail.vbx.knowconceptdw.net

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  • Restore using time machine from an macbook to an macbook pro (first intel)

    - by Anders Nørgaard
    Hello.. My girlfriend have Macbook 10.6.3, the first plastic version. the screen broke an its at service store now. In the mean time, i have tried to restore from hers TM backup to my old macbook pro 10.6.3 (the first intel version). Everything seems to work out fine, but when its finish, it says reboot, but nothing happens. When i hold down the power button, powering down, and starts again, its come up with the grey roll down screen "you need to restart your machine again" in different languages. I have tried the restore procedure over again 2 times, and every time it ends up like this... Anyone have a suggestion what to do ? Thanks - Anders.

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  • iMac G5 20" (First All-In-One White Screen) Cannot Connect To Internet

    - by Goober
    The Scenario I've got an iMac G5 20" (First All-In-One White Screen) PPC. It has an Airport Extreme Network card in order to wirelessly to connect to the internet. For the most part I connect using ethernet as opposed to wirelessly, but recently have had the need to connect using the wireless. The Hardware BT Home Broadband Wireless Router. iMac G5 20" From about 5 years ago (First All-In-One White Screen) The Issue Even though I know for a fact that It has connected to the internet wireslessly in the past, for some reason it can discover the wireless router, but upon entering the password it fails to connect. I have tried multiple times to no avail. I have 2 other Mac's on the network and a pc that can all connect wirelessly. However both the mac's. Question Any ideas as to why my really old iMac G5 can't connect wirelessly anymore!?

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  • DNS server redirect users on first visit

    - by Sihan Zheng
    I am looking for a DNS level solution, that redirects a user to a specific IP on the first visit, than directs them to the correct IP on subsequent visits. So the idea is, for example, if a user visits "malicioussite.com", the first time they try to resolve that DNS name, it resolves to the IP of an internal web server, showing them a warning. On subsequent resolves, the users would get the actual IP, so they can visit the site. How can this be achieved? I am really flexible on what I can use, as long as its on the DNS level.

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  • Windows 8.1 Search does not automatically select first search match

    - by Miguel Sevilla
    When I search in Windows 8/8.1 (start menu-start typing), it doesn't automatically highlight the search term. For example, if I'm trying to open the "Internet Options" panel and type the entire thing out in search, I have to down arrow or tab to the "Internet Options" search result. This is retarded. I'm used to Windows 7 style search where the first match is highlighted and i can easily just hit return. First match highlighting does work for other built-in things like "Control Panel", but it should work for all things in general, as it did in Windows 7 search. Anyways, if there is an option to enable this in Windows 8/8.1, I'd appreciate the tip. Thanks!

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  • Child Folder inheriting a permission that parent folder does not have (NTFS)

    - by just.another.programmer
    I'm reconfiguring roaming profiles on my network to use proper NTFS security settings according to this article. I have reset the following permissions on the roaming profile parent folder: CREATOR OWNER, Full Control, Subfolder and files only User group with profiles, List folder, Create folders, This folder only System, Full Control, This folder, subfolders, and files Then I select one of the actual roaming profile folders and follow these steps to fix the NTFS settings: Click Security, Advanced Uncheck "Allow inheritable permissions..." Choose "Remove..." Recheck "Allow inheritable permissions..." Click "Apply" After I choose apply, I get the following permissions listed on the roaming profile folder: Administrators (MYDOMAIN\Administrators) Full Control, This folder only CREATOR OWNER, Full Control, Subfolders and files only System, Full Control, This folder, subfolders, and files Where is the Administrators entry coming from!? There is an entry on the root of the drive for Administrators to have full control, but the Roaming Profile Parent folder is not set to inherit any permissions, and it does not have the administrators permission.

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  • Choosing my first Domain Registrar?

    - by user36914
    This will be the first domain i've ever registered. So i'm at a loss what to look for. I definitely don't want to go with GoDaddy. Here are my requirements: Must have unlimited email forwards for my domain Easy to transfer away if i choose. Must not be one of those shady registrars that will try to auction your domain at the end. Ability to create sub domains Domain Registration is Private I would like a domain registrar that would let me use my dynamic ip of my ISP (Cable) if i want to. So hopefully they would have some type program that would detect IP changes and update accordingly So i've looked at a variety of registrars so far. The three left were really NameCheap, DreamHost, & DomainMonster. I have heard good things about DreamHost but i think its off the list because they don't give you any information about the features you get when you register your domain with them. They have a "Whats included" button the page but it mainly list the features with hosting not registration. DomainMonster looks pretty cool but i don't see anything about subdomains. Also i would assume they don't have a system for dynamic ip address updating. So you would have to constantly check that your ip of your ISP has changed or not and update it manually. NameCheap also looks nice. There are two things i really like about them. Right on their feature page they list "Free Dynamic DNS With Client" which is pretty cool. They also have a free SSL certificate for the first year. Haven't messed a lot with certificates but this would definitely be something i would use. Only minus i can see is you only get free private whois for the first year. After that its $2.99 which isn't that big of a deal. I'm leaning towards NameCheap now. Is this a good choice. Is there anything else i should be looking at?

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  • Writing my first bash script (line 2: testscript: No such file or directory)

    - by skyeagle
    I am attempting to write my first shell script (I'm running Ubuntu 10.x) This is what my 'script' looks like cd /path/to/directory/cronscripts . testscript I put the following debug statements (after the cd), in the script above to make sure everything was ok: pwd echo `ls -lhrt` and it displayed all the files in the directory. So I dont understand the error message I am getting. I have the following two questions Why am I getting the above error message and how do I fix it? My script seems to run fine without a shebang in the first line - infact when I try either of the following: #!/usr/bin/bash #!/usr/bin/bash env I get the following error message: /usr/bin/bash: bad interpreter: No such file or directory What is the purpose of the shebang statement and why do I get the above error when I try to include it in my script/ how do I fix it, so I can add the shebang (is it necessary? - it seems most script examples have the shebang - but I'm not sure if it is a must, as the script runs without it).

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  • apache webserver unresponsible with server-status showing all child processes waiting for connection

    - by Jeff
    My setup: i have 3 nearly identical webserver machines serving the same high loaded dynamic website with simple load balancing over dns. The service has been working for over two ears with the same apache config. apache2, php5, ubuntu 8.04 linux 2.6.24-29-server My problem: since about two weeks i'm experiencing problems with this config. Nearly every day i have one small moment about 5 minutes, in which the website is unreachable. I'm still able to login to the servers over ssh. If i run htop, i see the machine simply doing nothing. i have about 1000 apache processes running, but no cpu activity. i've used the apache mod_status to debug this situation. the process scoreboard looks like this: _C.___K_______________________R._______.__K_K____K___C_______.__ _______C__________.___________________________________.________C _.____K__________K___K_WK_____._K_____________________________._ W______K__________K________.____________________._______C_______ _C_.__K__K____.._.._____________________________________C_______ _R___________K___.______C________.C_________.______._____C______ ____________KKC____K_____K__WC_________________C_____.__.____.__ _____________________C_________K______.____C______._____________ _.___C____.___.___________________________.K______.____K________ W__.___________________C.__.____K________K_______R_._.__._______ __C__C_.__________C__C_______._____W______________C_.___C_______ ____.______C_____________C________.____C____________.________._K __.__________.K_____________K_________._____C____.K__________KW_ __K.W________R_________._______.___W___________.____.__K_____W__ W___.___..________W____K Scoreboard Key: "_" Waiting for Connection, "S" Starting up, "R" Reading Request, "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup, "C" Closing connection, "L" Logging, "G" Gracefully finishing, "I" Idle cleanup of worker, "." Open slot with no current process So the most of the processes are just waiting for connection. after about 5 minutes the situation will return to normal: i have lot least processes on every machine, the most workers have the "."-status (meaing they are open to process a request) and of course the website is reachable! so i'm trying to find something in the logs, but there is simply nothing... the apache access log is silent for about 4 minutes, the same is for the error log. i also can not figure out anything wrong in other system logs. the situation is the same on all 3 webservers (all of them have this load peak and unresposibility at the same time), so i do not thing this is hardware related. but i think, this might be related to some network (tcp) issue. any ideas? EDIT: some more information, that i have just discovered: it has just happened again. and i was able to verify that i'm also not able to connect locally when this problem occurs. i have made some connection statistics with the following command after it happend netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c 109 CLOSE_WAIT 2652 ESTABLISHED 2 FIN_WAIT1 11 LAST_ACK 12 LISTEN 91 SYN_RECV 1 SYN_SENT 16 TIME_WAIT If i execute the same command some time later, i have something like this: 4 CLOSING 108 ESTABLISHED 18 FIN_WAIT1 182 FIN_WAIT2 37 LAST_ACK 12 LISTEN 50 SYN_RECV 11276 TIME_WAIT So in the normal situation i have only 100-200 open connections by clients beeing handled by apache in this moment. when i have this "crash", i have a lot more connections. what is the best way to analyse this? EDIT2: the important lines in apache2.conf are: KeepAlive On MaxKeepAliveRequests 20 KeepAliveTimeout 1 <IfModule mpm_prefork_module> ServerLimit 920 StartServers 30 MinSpareServers 80 MaxSpareServers 120 MaxClients 920 MaxRequestsPerChild 700 </IfModule> it is an apache2 prefork with php_mod. the server has 8GB ram and a 4gb swap partition.

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  • How to clone or copy running windows 7 to child partition

    - by saad
    Is there anyway to clone partition to partition in windows 7 for free using some kind of command line tool so that i can set block size to increase speed i google and found some tools like dd for windows and dcfldd but when i use them it gives me error like access denied and permission denied i tried to login as administrator using: net user administrator on but its same problem dcfldd bs=4096 if=.\k: of=\.\m: while its working to create image file : dcfldd bs=4096 if=.\k: of=\.\M:\filename.ext some help needed on this will appreciate thanks

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  • why is iometer performance slower after first run?

    - by Dan
    I'm doing some benchmarking with IOMeter, and I'm seeing a consistent and susbtantial drop-off in performance after running the first test. These drop-offs are about the same on the three systems I've tested on, which makes me think it's a configuration setting, or just a fact of life about using IOMeter. For example, one system (local RAID 10) went from 388 I/Os per second the first run, to about 211 I/Os per second on every run after that. Everything else about the test was identical, and I also bounced the machine in between runs. So, is this expected behavior, or am I missing something?

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  • Create a AD-LDS partition under a child of the primary partition

    - by ixe013
    I have a AD-LDS instance running on a Server 2008 R2. I have this application partition, created at installation : dc=enterprise,dc=example,dc=com I have succesfully followed this procedure to create application partitions. They are named : cn=stuff,dc=enterprise,dc=example,dc=com cn=things,dc=enterprise,dc=example,dc=com If I configure my client(s) to follow referals, I can search from dc=enterprise,dc=example,dc=com and find objects under cn=stuff and cn=things. How can I create (or move after the fact) the stuff and things partitions so they are logically located under a OU under the initial partition, ending up with something like : cn=stuff,ou=applications,dc=enterprise,dc=example,dc=com cn=things,ou=applications,dc=enterprise,dc=example,dc=com

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  • First time setting up a MySQL database.

    - by Wilduck
    In trying to learn how to work with the LAMP stack, I've hit a wall with MySQL. I can't seem to find a good reference for the first time setup of MySQL to be used with Apache and python. So, my question is four-fold: 1) Under what circumstances should I create my first database. That is, what user do I use (Apache's http user? root?) 2)How do permissions work? 3) Do I have to do anything on the MySQL side to make MySQL talk to Apache, or MySQL to talk to Python/Django? 4) Is there a good resource online that describes setting all of this up? I've found a bunch for using a database once it's in place, but none for the initial setup? Notes: I'm trying to run my LAMP stack on a dedicated little box for testing/learning purposes only, so I don't have access to any DBA that could help me, as much as I'd like one.

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  • Terminate child processes on ctrl-c

    - by jackweirdy
    In tiny core linux, I have the following script: #!/bin/sh # ~/.X.d/freerdp.sh rdp(){ while true do xfreerdp -f [IP Address] done } rdp & It's pretty simple; when X starts up and checks the .X.d directory (as is the case in tiny core) it finds and executes this script. The script starts up freerdp and keeps a connection open to the server by restarting it whenever it closes. As you can see from the rdp & line, the function is run in the background to allow X to continue its startup routine. The problem is that whenever I cancel X with a Ctrl-Alt-Backspace the rdp process doesn't die. I'm looking for a way to kill the process as soon as X finishes, either through: A) a script, executed on X closing, which kills the process or B) by modifying the script to check the return value of the xfreerdp command. NB - if the solution does check the return value, it must only end if the command fails to open the X display. For that reason, if you could point me to a reference for xfreerdp return values I'd be grateful.

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  • First request too slow even if I have a load balancer in the back

    - by adrian7
    I have an Apache 2 on Centos + bind with a wordpress website on it (e.g example.com). I have also set up, on another server in a different contry a load balancer (varnish:80 + nginx 127.0.0.1:8080) for it - which task is to server all static content under /wp-content/. Using Simple DNS editor I added an A entry to cdn.example.com pointing to the server's IP. So no extra work from a 2nd dns server. Then using htaccess I redirect all requests to jpg|gif|css|js files to cdn.example.com. That works and all files are saved on the "cdn" server and served right away. My problem is that for the first time I enter on example.com (e.g after restarting the computer or closing the browser) the load time is 1 up to 3 seconds, while any subsequent page loads take only 300 to 600 miliseconds. I know it might be a DNS issue, but I have done a cache check on several websites and cdn.example.com indicates the right IP. Do you have any ideas where I should dig to solve this first-time slowness?

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  • Extract first page from multiple pdfs

    - by Tim Alexander
    Have got about 500 PDFs to go through and extract the first page of. They then need to go through some time consuming conversion process so was hoping to try and save some time by have a batch process to extract just the first page from the 500 pdfs and place it in a new pdf. Have had a poke around Acrobat but can find no real method of doing this for multiple files. Does anyone know any other programs or methods that this could be achieved? Free and open source are obviously more favourable :) EDIT: Have actually had some success using GhostScript to extract just one page. Am now looking at how to batch that and take the list of files and use those.

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  • Need a .htaccess reroute exception when dealing with authentication in a child directory

    - by Brandon G
    # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> # END WordPress I added authentication to a directory "/pb" off the root of this and I'm getting redirected. Is there any way I can add an exception to this rewrite rule to allow no rewrites when accessing /pb ? Thanks!!

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  • Creating different margins on the first page of a word template

    - by Paul
    I have a letterhead template and I need the first page left margin to be larger than subsequent pages. I've seen the option of placing a text box or image box in the header to push the text but this ends up throwing off the tabs and bullet list indentation markers. I thought of setting up the first page using two columns and pushing the text to start on the second column but I can't seem to find a way to get the text to switch back to 1 column on the second page when it is created from text overflowing. Does anyone know how something like this is possible? Thanks in advance, Paul

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  • awk + remove all not uniq lines except the first line uniq (FILE NAME)

    - by yael
    hi I have the following file How to remove by sed all FILE NAME lines except the first uniq FILE NAME For example need to remove all FILE NAME lines from the file except the first: FILE NAME: /dir1/dir2/dir3/dir4/dir5/file FILE NAME: /dirA/dirB/dirC/dirD/dirE/file the file: FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 12 SOURCE FILE: 565 FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 18 SOURCE FILE: 552 FILE NAME: /dir1/dir2/dir3/dir4/dir5/file PARAMETER NAME: blablabla TARGET FILE: 14 SOURCE FILE: 559 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 134 SOURCE FILE: 344 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 13 SOURCE FILE: 445 FILE NAME: /dirA/dirB/dirC/dirD/dirE/file PARAMETER NAME: blablabla TARGET FILE: 13 SOURCE FILE: 434

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