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• Is it OK to mix C and C++ in an interview?

  - by John Pell

  If I am asked in an interview to write down some code, should I completely stick with C++ or is it acceptable to "mix" the two to write easy code as it comes to my mind? I'll explain it: if I'm asked to create a "stack" data type, a C++ class is perfectly suited, while if I need to parse some strings a strtok/sscanf is far easier than STL. On the other hand, if I need a generic container STL and templates are the way to go. Everything can be done in C or in C++, but in an interview I can't code everything or remember every standard/STL function. What is an acceptable tradeoff?

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• Should I keep separate client codebases and databases for a software-as-a-service application?

  - by John

  My question is about the architecture of my application. I have a Rails application where companies can administrate all things related to their clients. Companies would buy a subscription and their users can access the application online. Hopefully I will get multiple companies subscribing to my application/service. What should I do with my code and database? Seperate app code base and database per company One app code base but seperate database per company One app code base and one database The decision involves security (e.g. a user from company X should not see any data from company Y) performance (let's suppose it becomes successful, it should have a good performance) and scalability (again, if successful, it should have a good performance but also easy for me to handle all the companies, code changes, etc). For the sake of maintainability, I tend to opt for the one code base, but for the database I really don't know. What do you think is the best option?

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• Need suggestions on what you regard as &ldquo;security&rdquo;

  - by John Breakwell

  I’m currently writing a large piece on MSMQ security and wanted to check I was covering the right areas. I have some doubts as I’ve seen the occasional MSMQ forum question where a poster has used the word “security” in different contexts to what I was expecting. So here are the areas I plan to cover: Message security encryption on the wire (SSL and IPSEC) encryption of the message (MSMQ encryption) encryption of the payload (data encryption) signing and authentication Queue security SIDs and ACLs Discoverability Cross-forest issues Storage security NTFS permissions unencrypted data Service security Ports and Firewalls DOS attacks Hardened mode (HTTP only) RPC secure channel requirement authenticated RPC requirement Active Directory object permissions Setup Administrator requirements What else would you want to see?

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• Install failing new hard drives

  - by John

  I'm trying to install Ubuntu server 12.04 on my new hard drives but it seems to fail. Once past the option menu where is asked the partition to install the OS on, goes into a hold and no progress is shown afterwards. The hard disk I'm trying to install it on is: Western Digital WD20EARX The installation process hangs around 'installing core packages/installing the base system' . The CD comes through the test with being valid/ok. any help would be appreciated. Thanks in advance.

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• AdventureWorks2014 installation script

  - by John Paul Cook

  The AdventureWorks2014 sample database is downloadable from here . If you choose to run the script and are unfamiliar with sqlcmd, this post shows you what to do. Be sure to extract the zip file’s contents to a new folder because the instawdb.sql comes with 72 csv files that contain the actual data. If you specify a folder other than the default, you’ll have to change a path in the instawdb.sql script to point to your directory. Figure 1. instawdb.sql script file in SSMS. Notice the 3 lines that...(read more)

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• how to insert multiple characters into a string in C [closed]

  - by John Li

  I wish to insert some characters into a string in C: Example: char string[20] = "20120910T090000"; I want to make it something like "2012-09-10-T-0900-00" My code so far: void append(char subject[],char insert[], int pos) { char buf[100]; strncpy(buf, subject, pos); int len = strlen(buf); strcpy(buf+len, insert); len += strlen(insert); strcpy(buf+len, subject+pos); strcpy(subject, buf); } When I call this the first time I get: 2012-0910T090000 However when I call it a second time I get: 2012-0910T090000-10T090000 Any help is appreciated

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• How to view files backed up to Ubuntu One by Déjà Dup?

  - by irrational John

  I decided to try out the Ubuntu Backup system application on my 11.10 partition. Currently I am just using the default settings to back up folders in my Home (~) folder to the deja-dup in my Ubuntu One cloud. I have not been able to figure out how to view which files have been saved to the backup location other than by restoring them to a temp folder and then seeing what was restored. I'm hoping there is a less kludgy way to just find out what has or has not been backed up.

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• What amount of PHP memory usage is reasonable for multiple WordPress sites? [closed]

  - by John

  It seems like I've been plagued with memory usage issues most of the time I've been blogging (7 years). I upgraded my hosting to a HostGator VPS and still seem to have issues. I have about a dozen WP 3.4.2 sites running within a single account. Each has a separate installation. I finally installed TPC! Memory Usage within one of my WP installs to see what was going on. The memory usage just standing still is on the order of 40 MB. This seems high, but I don't know. What would be a reasonable memory usage for these WP installs? Do I need to take other things into account, or am I even looking at it the right way?

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• Is there a stackexchange like extension for magento? [closed]

  - by John K

  I'm looking into adding a knowledge base solution to our existing magento installation where people can ask questions regarding our products in a similar way to the stackexchange format. I could not find anything myself, so I was wondering if anyone had experience with implementing something similar, perhaps trough multiple extensions tied together to achieve this. Any help would be appreciated.

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• Hiding array in apache_get_modules(); [closed]

  - by John Smiith

  i wan't to view all apache modules i use script below <?php $amods = apache_get_modules(); print_r($amods); This will output Array ( [1] => mod_win32 [2] => mpm_winnt [3] => http_core [4] => mod_so [5] => mod_actions [6] => mod_alias [7] => mod_asis [8] => mod_auth_basic [9] => mod_authn_default [10] => mod_authn_file ) how to hide array ( ... i want to apache get modules like this installed modules is mod_php5 mod_authn_default mod_userdir etc

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• What could a kernel mode driver be possibly useful to?

  - by John Pell

  This might sound weird but there's an explanation for my question: I want to write something to impress a potential recruiter, and I want (to strenghten my skills) to create a program which should communicate with kernel mode driver(s). I'm not starting from a goal and trying to design the system to achieve it, I'm doing the opposite: designing the system and trying to justify it with a meaningful goal. So here comes the question: what could a kernel mode driver be possibly useful to? The answers that come to my mind right now are: I might want to communicate with hardware (not really my case, it's a software project mainly) I might want to mess around with the OS (security/hooking?) ?? I need some other examples like those

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• How do I force the system to look for new sound devices?

  - by John Zeringue

  I have a small flat screen TV (Toshiba) that I often connect via HDMI to my laptop (an HP Pavilion dv4) and use as a computer monitor. When I do this, I prefer to use the TV's speakers, particularly when I'm watching video, because the sound quality is much better. However, when I connect the HDMI cable after turning on my computer (rather than having it plugged in before booting up), Sound Settings does not list the TV as an output device, and I am forced to reboot. I was curious if there is an easier solution to this, perhaps a CLI command to check for new sound outputs. Does anyone know of something like this or have another solution? To clarify, I believe this is a software problem. The HDMI always works, and I can switch my desktop over to the TV at any time. The issue is that, if the HDMI wasn't connected during start up, the TV will not appear as an output option in the Sound Settings GUI. So, unless I'm mistaken, my question is not HDMI specific, but rather a general usage question about manipulating sound settings from the command line.

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• &ldquo;Why do transactional messages all have the same priority?&rdquo;

  - by John Breakwell

  I answered this question on the MSMQ forum on MSDN and thought it worth sharing here. The poster wanted to know why all transactional messages have a fixed priority of zero (instead of 0 through 7). They wanted the guaranteed delivery of messages to a queue but wanted to assign different levels of priority. Some aspects of MSMQ were defined way back in the last century and this is one of them. If I remember right, the reason was to avoid the following scenario: You have a single transaction of 3 messages (a, b and c) with priorities 5, 3 and 4 respectively. The messages are sent in order a,b,c The messages arrive in the queue and are arranged in order a,c,b to reflect priority order This breaks the guaranteed order part of the transaction.  I know that very few people send more than one message in a transaction but that is a scenario that MSMQ has to be able to handle; for the majority, including yourself, this scenario is irrelevant which is why you are surprised by the absence of transactional priorities. The options, therefore, available to the Microsoft developers were to: Implement code that allowed you to send messages with variable priority as long as any messages within the same transaction were the same priority, or Define a set priority for all transactional messages As you can understand, option 1 would be a complicated arrangement with all the necessary enforcement, error handling, user education and documentation, etc. Sure, it would have been possible to implement option 1 but I expect the product group decided to invest the development time in some other aspect of MSMQ. Now, with five versions out there, it would be confusing to change how the product operates, in addition to potentially breaking exisiting systems that have been working fine for years. So, balancing cost and risk against customer demand, I would not expect this feature to ever change.

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• If I were to start an Android or iPhone app or game, what program should I use?

  - by John

  I don't really know a lot about programming and the only things I do is using codes with Gamemaker, but I have read that it is too basic and it can't be used with iPhone or Android. Is there anything free that I can use to make games for those platforms? Or if not, any suggestions for engines or anything else? I was wondering about Unity, for example, is that a good investment to use for making games?

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• Why is the remove function not working for hashmaps? [migrated]

  - by John Marston

  I am working on a simple project that obtains data from an input file, gets what it needs and prints it to a file. I am basically getting word frequency so each key is a string and the value is its frequency in the document. The problem however, is that I need to print out these values to a file in descending order of frequency. After making my hashmap, this is the part of my program that sorts it and writes it to a file. //Hashmap I create Map<String, Integer> map = new ConcurrentHashMap<String, Integer>(); //function to sort hashmap while (map.isEmpty() == false){ for (Entry<String, Integer> entry: map.entrySet()){ if (entry.getValue() > valueMax){ max = entry.getKey(); System.out.println("max: " + max); valueMax = entry.getValue(); System.out.println("value: " + valueMax); } } map.remove(max); out.write(max + "\t" + valueMax + "\n"); System.out.println(max + "\t" + valueMax); } When I run this i get: t 9 t 9 t 9 t 9 t 9 .... so it appears the remove function is not working as it keeps getting the same value. I'm thinking i have an issue with a scope rule or I just don't understand hashmaps very well. If anyone knows of a better way to sort a hashmap and print it, I would welcome a suggestion. thanks

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• How to tell two windows of the same program apart? [closed]

  - by john mossel

  Possible Duplicate: Disable joining multiple windows to one icon in unity panel If I have two vlc players open, I have to go to the sidebar and click on the vlc icon, then pick which one I want (it does this cool effect where it shows you both windows side by side-- as great as that is, it gets bloody annoying after a while). Is there not an easier way of doing this? Is there no possibility of reverting back to the old system?

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• I need a form to tie MySQL Records together (i.e., many-to-many relationships).

  - by John R

  I need a HTML-based form to tie database records together. The user scenario that I envision is somthing like this: A super-user does a search of the database and is delivered a table of records based on that search; each record is numbered with the database-record id. There would also be two text fields next to each record. These text fields would allow: the user to make a reference from one record to another. For example, a user could enter into record id #457 that there is a correlation with record ID #242. The user would also describe the type of relationship it is. This could be with a simple integer that represents the type of relationship between the two records. When the super-user hits the submit button, all of these relationships are saved in a mySqljoin table. One option is to give me advice on how to implement and code this myself in PHP. However, before I reinvent the wheel, another option is to lead me to a free script that does something similar.

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• Can't install Wine on 12.04 x64

  - by John

  I can't get Wine to install, it keeps say there are unmet dependencies. sudo apt-get install wine Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine : Depends: wine1.5 but it is not going to be installed E: Unable to correct problems, you have held broken packages. This is a fresh install.

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• XSLT transformation by grouping based on 3 elements/attributes

  - by Daniel

  This question is related to http://stackoverflow.com/questions/2863202/xslt-1-0-grouping-to-reformat-element-defined-by-date-into-element-defined-by-tas Just to understand more clearly the trick behind. How would the XSLT look like if we were to group by date, task and shift as below: Input XML; <Person> <name>John</name> <date>June12</date> <shift tier=1> <workTime taskID=1>34</workTime> <workTime taskID=2>12</workTime> </shift> <shift tier=2> <workTime taskID=1>3</workTime> </shift> </Person> <Person> <name>John</name> <date>June13</date> <shift tier=1> <workTime taskID=1>21</workTime> <workTime taskID=2>11</workTime> </shift> <shift tier=2> <workTime taskID=1>2</workTime> </shift> </Person> and similarly, the output would be <Person> <name>John</name> <tier>1</tier> <taskID>1</taskID> <workTime> <date>June12</date> <time>34</time> </worTime> <workTime> <date>June13</date> <time>21</time> </worTime> </Person> <Person> <name>John</name> <tier>1</tier> <taskID>2</taskID> <workTime> <date>June12</date> <time>12</time> </worTime> <workTime> <date>June13</date> <time>11</time> </worTime> </Person> <Person> <name>John</name> <tier>2</tier> <taskID>1</taskID> <workTime> <date>June12</date> <time>3</time> </worTime> <workTime> <date>June13</date> <time>2</time> </worTime> </Person>

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• Transform OpenGL coordinates to lower UIView coordinates

  - by John Qualis

  Hi, I am new to OpenGL over iPhone. I am developing an iPhone app similar to a barcode reader but with an extra OpenGL layer. The bottommost layer is UIImagePickerController, then I use UIView on top and draw a rectangle at certain co-ordinates on the iphone screen. So far everything is OK. Then I am trying to draw an OpenGL 3-D model in that rectangle. I am able to load a 3-D model in the iPhone based on this code here - http://iphonedevelopment.blogspot.com/2008/12/start-of-wavefront-obj-file-loader.html I am not able to transform the co-ordinates of the rectangle into OpenGL co-ordinates. Appreciate any help. Do I need to use a matrix to translate the currentPosition of the 3-D model so it is drawn within myRect? The code is given below.. Appreciate any help/pointers in this regards. John (void)drawView:(GLView*)view { static GLfloat rotation = 0.0; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glColor4f(0.0, 0.5, 1.0, 1.0); // The coordinates of the rectangle are myRect.x, // myRect.y, myRect.width, myRect.height // Do I need a transform matrix here? //glOrthof(-160.0f, 160.0f, -240.0f, 240.0f, -1.0f, 1.0f); [plane drawSelf]; .... } -(void)setupView:(GLView*)view { const GLfloat zNear = 0.01, zFar = 1000.0, fieldOfView = 45.0; GLfloat size; glEnable(GL_DEPTH_TEST); glMatrixMode(GL_PROJECTION); //glMatrixMode(GL_MODELVIEW); size = zNear * tanf(DEGREES_TO_RADIANS(fieldOfView) / 2.0); CGRect rect = view.bounds; glFrustumf(-size, size, -size / (rect.size.width / rect.size.height), size / (rect.size.width / rect.size.height), zNear, zFar); glViewport(0, 0, rect.size.width, rect.size.height); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); }

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• Perl DBI doesn't work with Oracle 11g

  - by John

  I am getting the following error connecting to an Oracle 11g database using a simple perl script: failed: ERROR OCIEnvNlsCreate. Check ORACLE_HOME (Linux) env var or PATH (Windows) and or NLS settings, permissions, etc. at The script is as follows: #!/usr/local/bin/perl use strict; use DBI; if ($#ARGV < 3) { print "Usage: perl testDbAccess.pl dataBaseUser dataBasePassword SID dataBasePort\n"; exit 0; } my ($user, $pwd, $sid, $port) = @ARGV; my $host = `hostname`; my $dbh; my $sth; my $dbname = "dbi:Oracle:HOST=$host;SID=$sid;PORT=$port"; openDbConnection(); closeDbConnection(); sub openDbConnection() { $dbh = DBI->connect ($dbname, $user ,$pwd , { RaiseError => 1}) || die "Database connection not made: $DBI::errstr"; } sub closeDbConnection() { #$sth->finish(); $dbh->disconnect(); } Anyone seen this problem before? /john

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• WPF designer gives exception when databinding a label to a checkbox

  - by John

  I'm sure it's something stupid, but I'm playing around with databinding. I have a checkbox and a label on a form. What I'm trying to do is simply bind the Content of the label to the checkbox's IsChecked value. What I've done runs fine (no compilation errors and acts as expected), but if I touch the label in the XAML, the designer trows an exception: System.NullReferenceException Object reference not set to an instance of an object. at MS.Internal.Designer.PropertyEditing.Editors.MarkupExtensionInlineEditorControl.BuildBindingString(Boolean modeSupported, PropertyEntry propertyEntry) at <Window x:Class="UnitTestHelper.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:FileSysCtls="clr-namespace:WPFFileSystemUserControls;assembly=WPFFileSystemUserControls" xmlns:HelperClasses="clr-namespace:UnitTestHelper" Title="MainWindow" Height="406" Width="531"> <Window.Resources> <HelperClasses:ThreestateToBinary x:Key="CheckConverter" /> </Window.Resources> <Grid Height="367" Width="509"> <CheckBox Content="Step into subfolders" Height="16" HorizontalAlignment="Left" Margin="17,254,0,0" Name="chkSubfolders" VerticalAlignment="Top" Width="130" IsThreeState="False" /> <Label Height="28" HorizontalAlignment="Left" Margin="376,254,0,0" Name="lblStepResult" VerticalAlignment="Top" Width="120" IsEnabled="True" Content="{Binding IsChecked, ElementName=chkSubfolders, Mode=OneWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource CheckConverter}}" /> </Grid> The ThreeStateToBinary class is as follows: class ThreestateToBinary : IValueConverter { #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if ((bool)value) return "Checked"; else return "Not checked"; //throw new NotImplementedException(); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return ((string)value == "Checked"); //throw new NotImplementedException(); } #endregion } Quite honestly, I'm playing around with it at this point. It was originally simpler (not using the ValueConverter) but was displaying similar behavior when I simply had the content set to: Content="{Binding IsChecked, ElementName=chkSubfolders, UpdateSourceTrigger=PropertyChanged}" Any ideas? Thanks, John

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• Multiple touch problem using UITouch/UIView in iphone

  - by John Qualis

  Hi, I am trying to implement a 2-finger "pinch" and "expand" (or enlarge) on a UIView using iPhone 3G and SDK 3.1.2. I haven't done programmed in UITouch/UIEvent before, so I appreciate any guidance to the problem I am facing. When I touch the screen with 2 fingers I see that sometimes "touchesBegan" gives me only 1 event. I need UITouch event count == 2 to measure the distance between 2 fingers. Hence I have to lift up my fingers and repeat this process again till I get both fingers to be detected. Is there a way around? Can I improve it? The actual resize works correctly once both fingers are detected but this issue seen at the start needs to be resolved. I know SDK 3.2 detects gestures such as pinch but I was wondering how it can be done in 3.1.2? The code is given below. The "OnFingerDown" function gets called randomly even when I put 2 fingers down whereas I want "onTwoFingersDown" to be called each time. Moreover the I get only 1 touch event each time I put my fingers down. I mean if "OnFingerDown" was called twice I could somehow get it to work. Thanks in advance. Appreciate any help. John - (void) touchesBegan: (NSSet*) touches withEvent: (UIEvent*) event { UITouch* touch, *touch1; CGPoint location, location1; if([[event allTouches] count] == 1) { touch=[UI[[event allTouches] allObjects] objectAtIndex:0]; location=[touch locationInView:self]; OnFingerDown(location); } else if([[event allTouches] count] == 2) { touch=[[[event allTouches] allObjects] objectAtIndex:0]; location=[touch locationInView:self]; touch1=[[[event allTouches] allObjects] objectAtIndex:1]; location1=[touch1 locationInView:self]; OnTwoFingersDown(location, location1); } }

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• Styling an Input Field

  - by John

  Hello, How can I give the input field below the characteristics listed below? Characteristics: -Text typed into the field starts in the upper left corner and starts on another line (wraps?) when the right border of the field is reached. -A scroll bar appears if the text is more than what can fit into the field. -The text is in Courier font. Thanks in advance, John echo '<form action="http://www...com/sandbox/comments/comments2.php" method="post"> <input type="hidden" value="'.$_SESSION['loginid'].'" name="uid"> <input type="hidden" value="'.$submissionid.'" name="submissionid"> <input type="hidden" value="'.$submission.'" name="submission"> <label class="addacomment" for="title">Add a comment:</label> <input class="commentsubfield" name="comment" type="comment" id="comment" maxlength="1000"> <div class="commentsubbutton"><input name="submit" type="submit" value="Submit"></div> </form> '; Some relevant CSS: .commentsubfield {margin-left: 30px; margin-top: 30px; width: 390px; height: 90px; border: 1px solid #999999; padding: 5px; }

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• Prefuse: Reloading of XML files

  - by John

  Hello all, I am a new to the prefuse visualization toolkit and have a couple of general questions. For my purpose, I would like to perform an initial visualization using prefuse (graphview / graphml). Once rendered, upon a user click of a node, I would like to completely reload a new xml file for a new visualization. I want to do this in order to allow me to "pre-package" graphs for display. For example. If I search for Ted. I would like to have an xml file relating to Ted load and render a display. Now in the display I see that Ted has nodes associated called Bill and Joe. When I click Joe, I would like to clear the display and load an xml file associated with Joe. And so on. I have looked into loading one very large xml file containing all node and node relationship info and allowing prefuse to handle this using the hops from one level to another. However, eventually I am sure that system performance issues will arise due to the size of data. Thanks in advance for any help, John

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