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• Autoconf (newbie) -- building with static library

  - by EB

  I am trying to migrate from manual build to autoconf, which is working very nicely so far. But I have one static library that I can't figure out how to integrate. That library will NOT be located in the usual library locations - the location of the binary (.a file) and header (.h file) will be given as a configure argument. (Notably, even if I move the .a file to /usr/lib or anywhere else I can think of, it still won't work.) Manual compilation is working with these: gcc ... -I/path/to/header/file/directory /full/path/to/the/.a/file/itself (Uh, I actually don't understand why the .a file is referenced directly, not with -L or anything. Yes, I have a half-baked understanding of building C programs.) I can use the configure argument to successfully find the header (.h file) using AC_CHECK_HEADER. Inside the AC_CHECK_HEADER I then add the location to CPFLAGS and the #include of the header file in the actual C code picks it up nicely. Given a configure argument that has been put into $location and the name of the needed files are myprog.h and myprog.a (which are both in the same directory), here is what works so far: AC_CHECK_HEADER([$location/myprog.h], [AC_DEFINE([HAVE_MYPROG_H], [1], [found myprog.h]) CFLAGS="$CFLAGS -I$location"]) Where I run into difficulties is getting the binary (.a file) linked in. No matter what I try, I always get an error about undefined references to the function calls for that library. I'm pretty sure it's a linkage issue, because I can fuss with the C code and make an intentional error in the function calls to that library which produces earlier errors that indicate that the function prototypes have been loaded and used to compile. I tried adding the location that contains the .a file to LDFLAGS and then doing a AC_CHECK_LIB but it is not found. Maybe my syntax is wrong, or maybe I'm missing something more fundamental, which would not be surprising since I'm a newbie and don't really know what I'm doing. Here is what I have tried: AC_CHECK_HEADER([$location/myprog.h], [AC_DEFINE([HAVE_MYPROG_H], [1], [found myprog.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location"; AC_CHECK_LIB(myprog)]) No dice. AC_CHECK_LIB is looking for -lmyprog I guess (or libmyprog?) so I'm not sure if that's a problem, so I tried this, too (omit AC_CHECK_LIB and include the .a directly in LDFLAGS), without luck: AC_CHECK_HEADER([$location/myprog.h], [AC_DEFINE([HAVE_MYPROG_H], [1], [found myprog.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location/myprog.a"]) To emulate the manual compilation, I tried removing the -L but that doesn't help: AC_CHECK_HEADER([$location/myprog.h], [AC_DEFINE([HAVE_MYPROG_H], [1], [found myprog.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS $location/myprog.a"]) I tried other combinations and permutations, but I think I might be missing something more fundamental....

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• Haskell newbie on types

  - by garulfo

  I'm completely new to Haskell (and more generally to functional programming), so forgive me if this is really basic stuff. To get more than a taste, I try to implement in Haskell some algorithmic stuff I'm working on. I have a simple module Interval that implements intervals on the line. It contains the type data Interval t = Interval t t the helper function makeInterval :: (Ord t) => t -> t -> Interval t makeInterval l r | l <= r = Interval l r | otherwise = error "bad interval" and some utility functions about intervals. Here, my interest lies in multidimensional intervals (d-intervals), those objects that are composed of d intervals. I want to separately consider d-intervals that are the union of d disjoint intervals on the line (multiple interval) from those that are the union of d interval on d separate lines (track interval). With distinct algorithmic treatments in mind, I think it would be nice to have two distinct types (even if both are lists of intervals here) such as import qualified Interval as I -- Multilple interval newtype MInterval t = MInterval [I.Interval t] -- Track interval newtype TInterval t = TInterval [I.Interval t] to allow for distinct sanity checks, e.g. makeMInterval :: (Ord t) => [I.Interval t] -> MInterval t makeMInterval is = if foldr (&&) True [I.precedes i i' | (i, i') <- zip is (tail is)] then (MInterval is) else error "bad multiple interval" makeTInterval :: (Ord t) => [I.Interval t] -> TInterval t makeTInterval = TInterval I now get to the point, at last! But some functions are naturally concerned with both multiple intervals and track intervals. For example, a function order would return the number of intervals in a multiple interval or a track interval. What can I do? Adding -- Dimensional interval data DInterval t = MIntervalStuff (MInterval t) | TIntervalStuff (TInterval t) does not help much, since, if I understand well (correct me if I'm wrong), I would have to write order :: DInterval t -> Int order (MIntervalStuff (MInterval is)) = length is order (TIntervalStuff (TInterval is)) = length is and call order as order (MIntervalStuff is) or order (TIntervalStuff is) when is is a MInterval or a TInterval. Not that great, it looks odd. Neither I want to duplicate the function (I have many functions that are concerned with both multiple and track intevals, and some other d-interval definitions such as equal length multiple and track intervals). I'm left with the feeling that I'm completely wrong and have missed some important point about types in Haskell (and/or can't forget enough here about OO programming). So, quite a newbie question, what would be the best way in Haskell to deal with such a situation? Do I have to forget about introducing MInterval and TInterval and go with one type only? Thanks a lot for your help, Garulfo

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• PERL newbie : get a proper minimal debug_mode solution

  - by Michael Mao

  Hi all: I am learning PERL in a "head-first" manner. I am absolutely a newbie in this language: I am trying to have a debug_mode switch from CLI which can be used to control how my script works, by switching certain subroutines "on and off". And below is what I've got so far: #!/usr/bin/perl -s -w # purpose : make subroutine execution optional, # which is depending on a CLI switch flag use strict; use warnings; use constant DEBUG_VERBOSE => "v"; use constant DEBUG_SUPPRESS_ERROR_MSGS => "s"; use constant DEBUG_IGNORE_VALIDATION => "i"; use constant DEBUG_SETPPING_COMPUTATION => "c"; our ($debug_mode); mainMethod(); sub mainMethod # () { if(!$debug_mode) { print "debug_mode is OFF\n"; } elsif($debug_mode) { print "debug_mode is ON\n"; } else { print "OMG!\n"; exit -1; } checkArgv(); printErrorMsg("Error_Code_123", "Parsing Error at..."); verbose(); } sub checkArgv #() { print ("Number of ARGV : ".(1 + $#ARGV)."\n"); } sub printErrorMsg # ($error_code, $error_msg, ..) { if(defined($debug_mode) && !($debug_mode =~ DEBUG_SUPPRESS_ERROR_MSGS)) { print "You can only see me if -debug_mode is NOT set". " to DEBUG_SUPPRESS_ERROR_MSGS\n"; die("terminated prematurely...\n") and exit -1; } } sub verbose # () { if(defined($debug_mode) && ($debug_mode =~ DEBUG_VERBOSE)) { print "Blah blah blah...\n"; } } So far as I can tell, at least it works...: the -debug_mode switch doesn't interfere with normal ARGV the following commandlines work: ./optional.pl ./optional.pl -debug_mode ./optional.pl -debug_mode=v ./optional.pl -debug_mode=s However, I am puzzled when multiple debug_modes are "mixed", such as: ./optional.pl -debug_mode=sv ./optional.pl -debug_mode=vs I don't understand why the above lines of code "magically works". I see both of the "DEBUG_VERBOS" and "DEBUG_SUPPRESS_ERROR_MSGS" apply to the script, which is fine in this case. However, if there are some "conflicting" debug modes, I am not sure how to set the "precedence of debue_modes"? Also, I am not certain if my approach is good enough to Perlists and I hope I am getting my feet in the right direction. One biggest problem is that I now put if statements inside most of my subroutines for controlling their behavior under different modes. Is this okay? Is there a more elegant way? I know there must be a debug module from CPAN or elsewhere, but I wanna a real minimal solution that doesn't depend on any other module than the "default" And I cannot have any control on the environment where this script will be executed... Many thanks to the suggestions in advance.

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• SaaS Architecture Question from Newbie

  - by user226767

  I have developed a number of departmental client-server applications, and am now ready to begin working on moving one of these applications to a SaaS model. I have done some basic web development, but I'm a newbie when it comes to SaaS architectures. One of the first questions that comes to mind as I try to design the architecture is the question of single vs. multi tenancy. The pros and cons of each vary significantly depending on the type of application and scale required, so I'd like to describe my application and scale needs below, and hope others can comment on how I should get started with the architecture. The client-server application currently consists of a Firebird database and a Windows application. The database contains about 20 tables containing a few thousand records in 4 primary tables, and a few hundred records in various lookup and related tables. Although the number of records is small, the size can get large, as the database can contain large BLOBS. Each customer sets up their own database and has a handful of users within the organization connected to it. When I update the db schema, a new windows application is released, and it checks the db schema and then applies the updates as needed. For the SaaS application, I am designing for 100's (not 1000's or millions) of new customers per year. My first thought was to go with a multi tenancy model to make updates easy (shut down apply the updates to one database, and then start up). On the other hand, a single tenancy model would provide a means to roll updates out to a group of customers at a time, and spread the risk of data corruption - i.e. if something goes wrong with a database, it will impact one customer instead of all customers. With this idea, I was thinking of having a single web front-end which would connect to a single customer database upon login. Thus, when a new customer creates an account, a new database would be created (each customer would have their own db with multiple users as needed for the customer). In this model, a db update would require either a process to go through each db to apply schema changes, or a trigger upon logging in to initiate a schema update similar to the client-server model currently in use. Can anyone point me to information for similar applications which have been ported from client-server to SaaS? Or provide any pointers to consider? Basically I'm looking for architecture examples of taking a departmental application and making it available as a self service website for multiple customers. Thanks for any suggestions, resources, etc.

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• Newbie's problems with MySQL and php

  - by Mirage81

  I'm a real newbie with php and MySQL. Now I'm working on the following code which should search the database for eg. all the Lennons living in Liverpool. 1) How should I modify "get.php" to get the text "no results" to appear if there are no search results. 2) How should I modify "index.php" to get the option values (city and lastname) straight from the database instead of having to type them one by one? 3) Am I using mysql_real_escape_string the right way? 4) Any other mistakes in the code? index.php: <form action="get.php" method="post"> <p> <select name="city"> <option value="Birmingham">Birmingham</option> <option value="Liverpool">Liverpool</option> <option value="London">London</option> </select> </p> <p> <select name="lastname"> <option value="Lennon">Lennon</option> <option value="McCartney">McCartney</option> <option value="Osbourne">Osbourne</option> </select> </p> <p> <input value="Search" type="submit"> </p> </form> get.php: <?php $city = $_POST['city']; $lastname = $_POST['lastname']; $conn = mysql_connect('localhost', 'user', 'password'); mysql_select_db("database", $conn) or die("connection failed"); $query = "SELECT * FROM users WHERE city = '$city' AND lastname = '$lastname'"; $result = mysql_query($query, $conn); $city = mysql_real_escape_string($_POST['city']); $lastname = mysql_real_escape_string($_POST['lastname']); echo $rowcount; while ($row = mysql_fetch_row($result)) { if ($rowcount == '0') echo 'no results'; else { echo '<b>City: </b>'.htmlspecialchars($row[0]).'<br />'; echo '<b>Last name: </b>'.htmlspecialchars($row[1]).'<br />'; echo '<b>Information: </b>'.htmlspecialchars($row[2]); } } mysql_close($conn);

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• NewBie Question, jQuery: How can we implement if...else logic and call function

  - by Rachel

  I am new to jQuery and so don't mind this question if it sounds stupid but here is something that I am trying to do : I have 3 functions like: AddToCart Function which adds item to the shopping cart: //offer_id is the offer which we are trying to add to cart. addToCart: function(offer_id) { this.submit({action: 'add', 'offer_id': offer_id}, {'app_server_url': this.app_server_url}); }, RemoveFromCart which removes data from the cart //target is link clicked and event is the click event. removeFromCart: function(target, event) { this.uniqueElmt('cart_table').find('.sb_item_remove').unbind('click'); var offer_id = $(target).parent().find('.offer_id').html(); this.submit({action: 'remove', 'offer_id': offer_id, 'next_action': this.config.current_action}, {'app_server_url': this.app_server_url}); }, Get the current state of the cart //return string which represents current state of cart. getCartItems: function() { return this.contents; } Now I am trying to do 3 things: if there is no content in cart and addToCart is called than some action, so basically here we need to check the current state of cart and that is obtained by calling getCartItems and if it is Null and than if addToCart is called than we perform some action if there is content in the cart and addToCart is called than some action,so basically here we need to check the current state of cart and that is obtained by calling getCartItems and check if it is Null or not and than if addToCart is called than we perform some action if we had some content in the cart. if there is content in the cart and removeFromCart is called some action, so basically here we need to check the current state of cart and that is obtained by calling getCartItems and if it is not Null and if removeFromCart is called than we perform some action Pseudocode of what I am trying to do: if there is no content in cart and addToCart is called than $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scAdd,scOpen', 'linkType' : 'o', 'linkName' : 'Cart : First Product Added' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scAdd,scOpen', }, } 'defer' : '0' } ); if there is content in the cart and addToCart is called than $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scAdd', 'linkType' : 'o', 'linkName' : 'Cart : Product Added' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scAdd', }, }, 'defer' : '0' } ); if there is content in the cart and removeFromCart is called $(document).track( { 'module' : 'Omniture', 'event' : 'instant', 'args' : { 'linkTrackVars' : 'products,events', 'linkTrackEvents' : 'scRemove', 'linkType' : 'o', 'linkName' : 'Cart : Product Removed' // could be blank, but can include event name as added feature 'svalues' : { 'products' : ';OFFERID1[,;OFFERID2]', 'events' : 'scRemove', }, } 'defer' : '0' } ); My basic concern is that am complete newbie to jQuery and JavaScript and so am not sure how can I implement if...else logic and how can I call a funtion using jQuery/JavaScript.

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• Autoconf -- including a static library (newbie)

  - by EB

  I am trying to migrate my application from manual build to autoconf, which is working very nicely so far. But I have one static library that I can't figure out how to integrate. That library will NOT be located in the usual library locations - the location of the binary (.a file) and header (.h file) will be given as a configure argument. (Notably, even if I move the .a file to /usr/lib or anywhere else I can think of, it still won't work.) It is also not named traditionally (it does not start with "lib" or "l"). Manual compilation is working with these (directory is not predictable - this is just an example): gcc ... -I/home/john/mystuff /home/john/mystuff/helper.a (Uh, I actually don't understand why the .a file is referenced directly, not with -L or anything. Yes, I have a half-baked understanding of building C programs.) So, in my configure.ac, I can use the relevant configure argument to successfully find the header (.h file) using AC_CHECK_HEADER. Inside the AC_CHECK_HEADER I then add the location to CPFLAGS and the #include of the header file in the actual C code picks it up nicely. Given a configure argument that has been put into $location and the name of the needed files are helper.h and helper.a (which are both in the same directory), here is what works so far: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"]) Where I run into difficulties is getting the binary (.a file) linked in. No matter what I try, I always get an error about undefined references to the function calls for that library. I'm pretty sure it's a linkage issue, because I can fuss with the C code and make an intentional error in the function calls to that library which produces earlier errors that indicate that the function prototypes have been loaded and used to compile. I tried adding the location that contains the .a file to LDFLAGS and then doing a AC_CHECK_LIB but it is not found. Maybe my syntax is wrong, or maybe I'm missing something more fundamental, which would not be surprising since I'm a newbie and don't really know what I'm doing. Here is what I have tried: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location"; AC_CHECK_LIB(helper)]) No dice. AC_CHECK_LIB is looking for -lhelper I guess (or libhelper?) so I'm not sure if that's a problem, so I tried this, too (omit AC_CHECK_LIB and include the .a directly in LDFLAGS), without luck: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location/helper.a"]) To emulate the manual compilation, I tried removing the -L but that doesn't help: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS $location/helper.a"]) I tried other combinations and permutations, but I think I might be missing something more fundamental....

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• Autoconf -- building with static library (newbie)

  - by EB

  I am trying to migrate my application from manual build to autoconf, which is working very nicely so far. But I have one static library that I can't figure out how to integrate. That library will NOT be located in the usual library locations - the location of the binary (.a file) and header (.h file) will be given as a configure argument. (Notably, even if I move the .a file to /usr/lib or anywhere else I can think of, it still won't work.) It is also not named traditionally (it does not start with "lib" or "l"). Manual compilation is working with these (directory is not predictable - this is just an example): gcc ... -I/home/john/mystuff /home/john/mystuff/helper.a (Uh, I actually don't understand why the .a file is referenced directly, not with -L or anything. Yes, I have a half-baked understanding of building C programs.) So, in my configure.ac, I can use the relevant configure argument to successfully find the header (.h file) using AC_CHECK_HEADER. Inside the AC_CHECK_HEADER I then add the location to CPFLAGS and the #include of the header file in the actual C code picks it up nicely. Given a configure argument that has been put into $location and the name of the needed files are helper.h and helper.a (which are both in the same directory), here is what works so far: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"]) Where I run into difficulties is getting the binary (.a file) linked in. No matter what I try, I always get an error about undefined references to the function calls for that library. I'm pretty sure it's a linkage issue, because I can fuss with the C code and make an intentional error in the function calls to that library which produces earlier errors that indicate that the function prototypes have been loaded and used to compile. I tried adding the location that contains the .a file to LDFLAGS and then doing a AC_CHECK_LIB but it is not found. Maybe my syntax is wrong, or maybe I'm missing something more fundamental, which would not be surprising since I'm a newbie and don't really know what I'm doing. Here is what I have tried: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location"; AC_CHECK_LIB(helper)]) No dice. AC_CHECK_LIB is looking for -lhelper I guess (or libhelper?) so I'm not sure if that's a problem, so I tried this, too (omit AC_CHECK_LIB and include the .a directly in LDFLAGS), without luck: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS -L$location/helper.a"]) To emulate the manual compilation, I tried removing the -L but that doesn't help: AC_CHECK_HEADER([$location/helper.h], [AC_DEFINE([HAVE_HELPER_H], [1], [found helper.h]) CFLAGS="$CFLAGS -I$location"; LDFLAGS="$LDFLAGS $location/helper.a"]) I tried other combinations and permutations, but I think I might be missing something more fundamental....

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• Piecing together low-powered hardware for an RS-232 terminal server

  - by Fred

  I'm working on reconstructing my Cisco lab for training/educational purposes and I found that the actual terminal server I have is dead. I have a couple of 8-port PCI serial cards which would be more than ample for my lab, but I don't want to leave my personal computer running to be able to access the console ports. Ideally I would access the terminal server remotely, either by SSH/RDP to the box (depending on what OS I go with) or by installing a software package that allows me to telnet directly to a serial port. I know I've found a program that does this under Linux in the past but its name escapes me at the moment. I'm thinking about scavenging for some old hardware, on eBay or something, to put together a low-powered PC. Needs to be something that: Has Low-power consumption Has at least 2 PCI slots (though I certainly wouldn't complain about having more) Has onboard Ethernet (or, if not, another PCI or ISA slot (not shared)) Can be headless once an OS installed (probably Linux) I'm currently leaning towards an old fashioned Pentium (sub-133MHz era) but I am wondering if anybody else knows of another platform/mobo that would suit these needs. Alternatively, I've been considering buying a Raspberry Pi and a big USB hub along with a bunch of USB-Serial adapters but this sounds like it'd get messy quick with cables and adapters all over the place, and I may not even have the same ttyS#'s between boots.

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• Computer freezes after watching Youtube videos

  - by Roberts

  I had Windows 7 installed all september. But I installed Windows XP Professional back because my computer couldn't handle the new OS. After first boot I tried to install newest flash player (from Adobe website), but it failed. I had my old setup on USB drive and it worked. I don't know is it important or not. I am watching Youtube videos in my free time (almost every hour). After few days the computer started to freeze when I open a page with the video or close the page with video, not while I watch a video. No BSODs. Nothing in Event viewer. I use Firefox only. When computer freezes the sound wont. If iTunes is playing a radio station or is it another video playing in background, the sound wont freeze. Last few days the mouse wont freeze. Its a strange symptom. If I click few times then the cursor will actually freeze. I just want to know where does this problem come from (hardware - graphics card, old motherboard or it's just some glitch in setups). If it's not graphics card then I will be happy. The graphics card is ATI Radeon HD 4650 - brand new. Catalyst 11.8 installed. Things I have tried: Installed newest flash player after a week (the setup didn't fail this time) Installed latest video drivers Deleting cookies Defragmenting hard drive Using TuneUp utilities for computer cleenup Installed latest Mozilla Firefox Cleaned the PC Changed CPU Fan speed almost to max (just to be sure) Things I haven't tried yet: Didn't try playing videos on other browsers What can I do now?

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• Fluent NHibermate and Polymorphism and a Newbie!

  - by Andy Baker

  I'm a fluent nhibernate newbie and I'm struggling mapping a hierarchy of polymorhophic objects. I've produced the following Model that recreates the essence of what I'm doing in my real application. I have a ProductList and several specialised type of products; public class MyProductList { public virtual int Id { get; set; } public virtual string Name {get;set;} public virtual IList<Product> Products { get; set; } public MyProductList() { Products = new List<Product>(); } } public class Product { public virtual int Id { get; set; } public virtual string ProductDescription {get;set;} } public class SizedProduct : Product { public virtual decimal Size {get;set;} } public class BundleProduct : Product { public virtual Product BundleItem1 {get;set;} public virtual Product BundleItem2 {get;set;} } Note that I have a specialised type of Product called BundleProduct that has two products attached. I can add any of the specialised types of product to MyProductList and a bundle Product can be made up of any of the specialised types of product too. Here is the fluent nhibernate mapping that I'm using; public class MyListMap : ClassMap<MyList> { public MyListMap() { Id(ml => ml.Id); Map(ml => ml.Name); HasManyToMany(ml => ml.Products).Cascade.All(); } } public class ProductMap : ClassMap<Product> { public ProductMap() { Id(prod => prod.Id); Map(prod => prod.ProductDescription); } } public class SizedProductMap : SubclassMap<SizedProduct> { public SizedProductMap() { Map(sp => sp.Size); } } public class BundleProductMap : SubclassMap<BundleProduct> { public BundleProductMap() { References(bp => bp.BundleItem1).Cascade.All(); References(bp => bp.BundleItem2).Cascade.All(); } } I haven't configured have any reverse mappings, so a product doesn't know which Lists it belongs to or which bundles it is part of. Next I add some products to my list; MyList ml = new MyList() { Name = "Example" }; ml.Products.Add(new Product() { ProductDescription = "PSU" }); ml.Products.Add(new SizedProduct() { ProductDescription = "Extension Cable", Size = 2.0M }); ml.Products.Add(new BundleProduct() { ProductDescription = "Fan & Cable", BundleItem1 = new Product() { ProductDescription = "Fan Power Cable" }, BundleItem2 = new SizedProduct() { ProductDescription = "80mm Fan", Size = 80M } }); When I persist my list to the database and reload it, the list itself contains the items I expect ie MyList[0] has a type of Product, MyList[1] has a type of SizedProduct, and MyList[2] has a type of BundleProduct - great! If I navigate to the BundleProduct, I'm not able to see the types of Product attached to the BundleItem1 or BundleItem2 instead they are always proxies to the Product - in this example BundleItem2 should be a SizedProduct. Is there anything I can do to resove this either in my model or the mapping? Thanks in advance for your help.

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• Objective-C NSArray NEWBIE Question:

  - by clearbrian

  Hi I have a weird problems with NSArray where some of the members of the objects in my array are going out of scope but not the others: I have a simple object called Section. It has 3 members. @interface Section : NSObject { NSNumber *section_Id; NSNumber *routeId; NSString *startLocationName; } @property(nonatomic,retain) NSNumber *section_Id; @property(nonatomic,retain) NSNumber *routeId; @property(nonatomic,retain) NSString *startLocationName; @end @implementation Section @synthesize section_Id; @synthesize routeId; @synthesize startLocationName; //Some static finder methods to get list of Sections from the db + (NSMutableArray *) findAllSections:{ - (void)dealloc { [section_Id release]; [routeId release]; [startLocationName release]; [super dealloc]; } @end I fill it from a database in a method called findAllSection self.sections = [Section findAllSections]; In find all sections I create some local variables fill them with data from db. NSNumber *secId = [NSNumber numberWithInt:id_section]; NSNumber *rteId = [NSNumber numberWithInt:id_route]; NSString *startName = @""; Then create a new Section and store these local variable's data in the Section Section *section = [[Section alloc] init]; section.section_Id = secId; section.routeId = rteId; section.startLocationName = startName; Then I add the section to the array [sectionsArray addObject:section]; Then I clean up, releasing local variables and the section I added to the array [secId release]; [rteId release]; [startName release]; [locEnd_name release]; [section release]; In a loop repeat for all Sections (release local variables and section is done in every loop) The method returns and I check the array and all the Sections are there. I cant seem to dig further down to see the values of the Section objects in the array (is this possible) Later I try and retrieve one of the Sections I get it from the array Section * section = [self.sections objectAtIndex:row]; Then check the value NSLog(@" SECTION SELECTED:%@",section.section_Id); BUT call to section.section_Id crashed as section.section_Id is out of scope. I check the other members of this Section object and theyre ok. After some trial and error I find that by commenting out the release of the member variable the object is OK. //[secId release]; [rteId release]; [startName release]; [locEnd_name release]; [section release]; My questions are: Am I cleaning up ok? Should I release the object added to an array and the local variable in the function? Is my dealloc ok in Section? Does this code look ok and should I be looking elsewhere for the problem? I'm not doing anything complicated just filling array from DB use it in Table Cell. If its a stupid mistake then tell me (I did put NEWBIE on the question so dont be shocked it was asked) I can comment out the release but would prefer to know why or if code looks ok then ill need further digging. the only place that secId is released is in the dealloc. Thanks

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• Ajax: distinguish old posts and new posts.

  - by xRobot

  Hi at all, I have created a very simple blog at www.example.com with a only one page. When I connect to www.example.com I see all posts inserted in the database ( in mysql ). Now I want that every 60 seconds an ajax request check in the database if there are new posts. If there are new posts these will be inserted at the top above the old posts. This is my question: How can I through Ajax retrieve only new posts ( and so distinguish old posts and new posts ) ?

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• Copy a domain in old schema to new schema with a procedure in postgresql

  - by Giri

  How do we copy a domain in old schema to new schema using a procedure in postgresql?

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• xcode build to iphone chooses old invalid provisioning profile

  - by sapatos

  I've just gone through some pain with iphone and xcode upgrades and keychain failures etc and decided to uninstall xcode completely and re-install. This fixed my keychain issues however the project I am working on appears to be linked to an old invalid provisioning profile. I've deleted the profile from "Provisioning Profiles" in organiser, and removed it from Provisioning on the Iphone section of Organiser. However when I build an go with the iphone sdk rather than simulator i get the pop up "codesign wants to sign using key "OldKey" in your keychain". It appears the actual app is associated with the old key and I can't seem to find how to point it to the new valid one. Crazy thing is at some point I managed to get it to work and install but the application crashed and won't open. I've not managed to get it to install again. Any ideas?

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• ActiveX controls with old Delphi versions

  - by DamienD

  I'm testing a non visual ActiveX control based on a registered .ocx which I import into Delphi using the provided wizard. Then, I simply put the generated component on the main form of a new VCL application. Under old Delphi versions (D5 and D2007), when i launch the application, this raise an AV during the component initialization. with Delphi 2009 : no problem, the application starts smoothly. My questions are : Are there known enhancements of ActiveX management in recent Delphi versions which can explain this difference ? Can I suspect a bug in the ActiveX control, or can I consider the origin of the problem is from old Delphi versions ? I need to use this component (if tests OK) in D2007. Do you think that it is possible to correct the AV problem under D2007 by modifying the D2007 generated .tlb file (for example by trying to use the D2009 generated one) PS: the ActiveX control is not named, because my question is a general question about Delphi and ActiveX, not about a specific ActiveX control.

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• Presenting MVC to Old C++ Spaghetti Coders?

  - by leeand00

  I wish to present the idea of MVC to a bunch of old C++ spaghetti coders (at my local computer club). One of them that has alot of influence on the rest of the group seems to finally be getting the idea of encapsulation (largely due in part to this website). I was hoping that I could also point him in the right direction by showing him Model View Controller, but I need to do it in a way that makes sense to him, as well as it probably needs to be written in C/C++! I realize that MVC is a very old architectural pattern so it would seem to me that there should be something out there that would do the job. I'm more of a web developer, so I was wondering if anybody out there who is a good C/C++ coder could tell me what it is that made the MVC light switch turn on in your head.

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• Address Book is returning old values

  - by Marcus Wood

  Hi there, I am having a problem with the AddressBook framework. It all seems to be stemming from ABCopyRecordForUniqueId returning a record with old data. Example: I run up the program below in one terminal window - it shows the current data. I make a change through the address book UI - my program continues to show old data. I run up another instance of the same program in a new terminal window - it shows the updated data. I have tried posting on the omnigroup site with no luck :( so any guidance is really appreciated PS: If you would like to try the code, to get an address book ID you can export a contact as a vCard and open it with a text editor int main (int argc, const char * argv[]) { ABAddressBookRef addressBook = ABGetSharedAddressBook(); while(1) { ABRecordRef addressBookRecord = NULL; addressBookRecord = ABCopyRecordForUniqueId(addressBook, CFSTR("4064D587-0378-4DCF-A6B9-D3702F01C94C:ABPerson")); CFShow(addressBookRecord); CFRelease(addressBookRecord); sleep(1); } return 0; }

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• Get old text from change event?

  - by Biroka

  Can I somehow find out what was the change in the textfield? I would want to compare the old text with the new text ... the problem is, that I have multiple textAreas in a tab-editor, and all the textAreas are watched by one eventListener. I want to get a value calculated by the next formula: globalChangeCount += thisTextArea.currentCharacterCount - thisTextArea.oldtCharacterCount where the globalChangeCount is a value modified by all changes in any of the textAreas. I am searching for these values through the event variable, but can't seam to find the old text of the textArea.

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• PHP 5.3, using old authentication?

  - by Geir

  Hi. We're setting up a new webserver with PHP5.3 and are getting the "Error: could not connect: mysqlnd cannot connect to MySQL 4.1+ using old authentication ?" error message. After some google'ing I've found that we should set old passwords = 0 in my.cnf and reset the password(s). But we still have webservers running php 4.x & 5.2 that access the same mysql server (different users & databases), how will these be affected by this ? Will the mysql server be compatible with all the different PHP versions ? Thanks.

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• Cannot delete old NFS directory: Device or resource busy

  - by Jakobud

  On server1, we had an NFS share mounted from server 2 like this: /nfs/server2/share Recently, we took down server2 to install a new OS on it. Now we can't get NFS setup the way it was. When I do this: ls -l /nfs I get this: drwxr-xr-x 2 root root 0 2010-03-15 09:59 server2 Notice how the directory size is 0 instead of 4096 like usual? Anyways I go into server2 expecting to see a share directory, but I don't. It's empty. So therefore I cannot mount my share at /nfs/server2/share. When I try to create /nfs/server2/share directory, I get mkdir: cannot create directory `share': No such file or directory I think this is because it doesn't really think the /nfs/server2 directory really exists. Even if I use the -p option with mkdir, it doesn't work. Next I tried to remove /nfs/server2 so I could just recreate it. I try to rm -r /nfs/server2 but I get rm: cannot remove directory `/nfs/server2': Device or resource busy So now I'm at a loss. I need to mount this NFS share in the same exact place on server1 (at /nfs/server2/share) because other software on server1 depend on this. But if I can't create that share directory and I can't remove that directory, what do I do? Also, just for testing, I attempted to mount the share at /nfs/testing/share and it mounted just fine. But like I said, I need to mount it back in the same location.

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• os x 10.4 Old, deleted user mail account problems

  - by Chris

  Hello- A while back I tried to add a user 'david' as a mail user on my OS X 10.4 server using dscl (I only had terminal access at the time, no ability to use workgroup manager). I could never get this account to work properly, so I deleted it. dscl . -list /Users no longer shows 'david' as an entry. I have since gained access via Workgroup Manager, and I am trying to re-create the 'david' account. Workgroup manager creates the account fine, along with an email account, which I can then log into via IMAP ('login david password' returns 'OK user logged in'). However, this mail account does not have an inbox, and I can not create one thru a mail client, IMAP or cyradm (they all say 'system I/O error'). When I re-delete this user, I can't find any record of him in any of the mail spool locations. Creating a user with any other name works fine (Inbox, mail access, everything). Any ideas on how I can get this user up and running again? -Chris P.S. - to create this user in the first place, I used dscl . create, then dscl . append /Users/david "some XML I found on the 'net" to add email privileges, if this helps...

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• uTorrent repeatedly downloads old files from the RSS feed

  - by Domchi

  So I set up uTorrent to automatically download torrents from EZTV search-based RSS feeds. And it works splendidly. I just set feeds to download automatically, and didn't set up smart episode filters or anything else in the uTorrent itself. However, from time to time something happens to EZTV feeds which makes uTorrent re-download every single torrent in every feed. I'm looking for a workaround.

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• Old operational master still thinks it is the "one"

  - by Doug

  Hi there, I have a domain with 3 AD servers for now i'll just call them: AD01 (Win 2008 GC, Operations master) AD02 (Win 2008 GC) AD03 (Win 2003 GC) A couple of months there was some hardware issues with AD01 so the operations master, PDC and Infrastructure Master was moved to AD02. All machines where on while this was happening. AD01 (Win 2008 GC) AD02 (Win 2008 GC, Operations master) AD03 (Win 2003 GC) AD01 was then shutdown for a month. Upon starting this machine up with replaced hardware (NIC and RAID card) i now have a weird problem. AD01 Thinks it is operations master still in AD on the local box AD02 & AD03 Thinks AD02 is operations master in AD on both boxes When running DCDIAG on AD01 i get a number of issues (listed below) When running "dcdiag /test:advertising" on AD01: Doing primary tests Testing server: Default-First-Site-Name\AD01 Starting test: Advertising Warning: DsGetDcName returned information for \\ad02.domain.local, when we were trying to reach AD01. SERVER IS NOT RESPONDING or IS NOT CONSIDERED SUITABLE. ......................... AD01 failed test Advertising Running partition tests on : ForestDnsZones Running partition tests on : DomainDnsZones Running partition tests on : Schema Running partition tests on : Configuration Running partition tests on : domain Running enterprise tests on : domain.local When running "dcdiag" on AD01 i get the following errors (excerpt of the Final output): Testing server: Default-First-Site-Name\AD01 Starting test: Advertising Warning: DsGetDcName returned information for \\ad02.domain.local, when we were trying to reach AD01. SERVER IS NOT RESPONDING or IS NOT CONSIDERED SUITABLE. ......................... AD01 failed test Advertising Starting test: FrsEvent There are warning or error events within the last 24 hours after the SYSVOL has been shared. Failing SYSVOL replication problems may cause Group Policy problems. Starting test: NCSecDesc Error NT AUTHORITY\ENTERPRISE DOMAIN CONTROLLERS doesn't have Replicating Directory Changes In Filtered Set access rights for the naming context: DC=ForestDnsZones,DC=domain,DC=local Error NT AUTHORITY\ENTERPRISE DOMAIN CONTROLLERS doesn't have Replicating Directory Changes In Filtered Set access rights for the naming context: DC=DomainDnsZones,DC=domain,DC=local Starting test: Replications [Replications Check,Replications Check] Inbound replication is disabled. To correct, run "repadmin /options AD01 -DISABLE_INBOUND_REPL" [Replications Check,AD01] Outbound replication is disabled. To correct, run "repadmin /options AD01 -DISABLE_OUTBOUND_REPL" So the problem appeasr to be that when i moved the operations master, AD01 never got the memo, and now that it's started up, all the other AD servers don't think its the boss anymore when it trys to replicate etc. So i really need to manually update AD01 so that it knows who the operations master, instrastructure and PDC is - but i'm not having any luck I've been googling for nearly a day and all solutions lead to "the cake is a lie" Your ninja skills will be greatly appreciated

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• New router, old network, but devices won't talk to each other

  - by JDedman

  I plugged the new router in and get internet on both the computer and the Xbox 360. The Xbox 360 only recognizes the computer when I turn the Smart Wall off in my Norton antivirus, and only when the computer is hardwired. How do I make it so that Norton will allow the computer and Xbox to talk? Reset the MAC address? I have no idea how to do this, and I'm starting to think it's the answer to my problem. Any help would be greatly appreciated.

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