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• Preon library problem

  - by Kamahire

  I am using preon lib to parse binary data it contain short, int data The structure as follows @BoundNumber(size="32", byteOrder=ByteOrder.BigEndian) public int time;// @BoundString(size="2") public String alphaChar;// 2 byte array @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code1;//short @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code2;//short @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code3;//short @BoundString(size="8") public String firstName;// 8 byte array @BoundString(size="8") public String middleName;// 8 byte array @BoundString(size="8") public String lastName;// 8 byte array @BoundNumber(size="16", byteOrder=ByteOrder.BigEndian) public int code4;//short I am getting correct values for code1, code2, code3 but for code4 it not giving me correct value. It always gives me 0(Zero); When I checked with position of byte array; it shows me correct value. Is there any kind padding require?

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• Throwing an AggregateException in my own code

  - by Pat

  How should I go about collecting exceptions and putting them into an AggregateException to re-throw? For my specific code, I have a loop and will have zero or more exceptions thrown from a part of the code. I was hoping to just add the new exceptions to the AggregateException as they arise, but the documentation sort of indicates that it should be constructed with all the Exceptions at once (there is no method to add an Exception to the object). And what about creating a new AE every time and just including the previous AE in the list of exceptions? Seems a hokey way to do it. Any better ideas?

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• Proper chart scaling in Reporting Services 2005

  - by lastas

  I'm developing a simple bar-chart in Reporting Services 2005 with a stored procedure as data-source. The values in this graph can be both positive and negative, and can span a very big range, and hence I cannot specify any non-dynamic scale that will work for all scenarios. The problem I'm facing is that the automatic scaling pretty much sucks. I get no line to show where the zero-point is, and the y-scale labels are from top to bottom: 8818 -191181 -391181 etc etc... So my question is, what is the best approach to make the scale more adapted to human reading? Is there any guide out there? Does reporting services 2008 handle this better? Also, moving away from Reporting Services is not really an option. I realize how to put values and expression in the max, min, and the gridline interval fields, although its more of a question what expressions I should put there.

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• mysql count(*) left join group by - the number of files in a folder

  - by Flavius

  Hi I have the following tables CREATE TABLE `files` ( `fileid` int(11) NOT NULL AUTO_INCREMENT, `filename` varchar(255) NOT NULL, `filesize` int(11) NOT NULL, `folder` int(11) NOT NULL, PRIMARY KEY (`fileid`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; CREATE TABLE `folders` ( `directoryid` int(11) NOT NULL AUTO_INCREMENT, `directoryname` varchar(255) NOT NULL, PRIMARY KEY (`directoryid`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; How to get a list of all folders and the number of files they hold, including folders who have no (zero) files? Recursion must not be taken into account. Found it select folders.directoryid, folders.directoryname, count(files.fileid) as no_files from folders left join files on files.folder = folders.directoryid group by folders.directoryid, folders.directoryname I hope it will help someone.

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• Keeping Score in XNA Game

  - by Seven

  Hi. I'm following an XNA tutorial and have the following code for collision detecting (detecting when a bullet collides with a target). Basically I'm looking to increment a score variable to display the score to the screen without re-writing the whole program. No matter where I place it in this method it seems to start incrementing from the number of targets, not from zero. Is there something simple I'm missing here? Any help would be greatly appreciated. Thanks. private CollisionType CheckCollision(BoundingSphere sphere) { if (completeCityBox.Contains(sphere) != ContainmentType.Contains) return CollisionType.Boundary; for (int i = 0; i < targetList.Count; i++) { if (targetList[i].Contains(sphere) != ContainmentType.Disjoint) { targetList.RemoveAt(i); i--; AddTargets(); return CollisionType.Target; } } return CollisionType.None; }

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• Explicit constructor still has default values even though a default constructor is not invoked.

  - by Phoenix

  According to my understanding a default constructor initializes the state of the object to default values, so if i provide an explicit no-arg public constructor like this then how are the values of d and e still getting initialized to zero because in this case the default constructor is not invoked. public class B extends A{ private int d; private int e; public B() { System.out.println(d); System.out.println(e); } } EDIT:: The only thing default constructor does is call to super() then how come if i have a explicitly mentioned a constructor here and A has a protected variable say c which is initialized to 17 in its constructor. Should I not be explicitly calling super() to be able to see that change since I'm using my own constructor ? Why is B still getting the value of 17 through inheritance ?

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• Correct approach to validate attributes of an instance of class

  - by systempuntoout

  Having a simple Python class like this: class Spam(object): __init__(self, description, value): self.description = description self.value = value Which is the correct approach to check these constraints: "description cannot be empty" "value must be greater than zero" Should i: 1.validate data before creating spam object ? 2.check data on __init__ method ? 3.create an is_valid method on Spam class and call it with spam.isValid() ? 4.create an is_valid static method on Spam class and call it with Spam.isValid(description, value) ? 5.check data on setters declaration ? 6.... Could you recommend a well designed\Pythonic\not verbose (on class with many attributes)\elegant approach?

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• .htaccess rules not working, but the file seems to be loaded

  - by user221877

  I am trying to remove .php at the end of the URL from any page thats loaded. RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}.php -f RewriteRule ^(.*)$ $1.php Its running on my own server, which has WHM/cPanel, so I can change settings at the server level, I'm just not really sure what I'm looking for. I found the httpd.conf file, but it said it was auto generated by whm, so I tried looking in whm for the correct settings but it had barely any settings related to htaccess. If I fill htaccess with gibberish it stops the site from loading, which I assume means that the .htaccess file is being loaded, so I'm not sure what the issue is.

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• Java Wicket - Calling javascript ( JQuery ) before AJAX

  - by user1428051

  I got this thing i'm trying to solve: I got a ListView created using Wicket ( 1.5 ) with a lot of elements and a scroll. When new items are available, the user is asked if he would like to refresh the list via a message backed by an AjaxLink: public void onClick(AjaxRequestTarget ajaxTarget) { /* do something ... */ ajaxTarget.addComponent(_list); } So on click the list gets reloaded and the scroll position is reset to zero. Is there any way i can call JavaScript before the list reloads the save the scroll position? (I know how to get/save the scroll position ( .scrollTop() ) , i just don't know how to call a function right before AJAX ).

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• Dynamically set the result of a TSQL query using CASE WHEN

  - by Name.IsNullOrEmpty

  SELECT MyTable.Name,(SELECT CASE WHEN ISNULL(SUM(TotalDays), 0) <= 0 THEN 0 ELSE SUM(TotalDays) END AS Total FROM Application AS Applications WHERE (ID = MyTable.id)) - MIN(Assignments) AS Excesses FROM MyTable The above TSQL statement is a subquery in a main query. When i run it, if TotalDays is NULL or <=0, then Total is set to 0 (zero). What i would like to do here is to set the result of the whole query(Excesses) to 0. I want (Excesses) which is the result of Total - Min(Assignments) to be set to 0 if its NULL or <=0. I want the CASE WHEN to apply to the whole query but am struggling to get it right.

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• getting height of the dynamically loaded div

  - by user1223654

  i am facing some difficulty with getting the height of the dynamically loaded div image.. sometimes , it gives the correct height but sometimes it gives zero .. here is my code $.ajax({ type: "POST", url: "images.php", data: dataStr, cache: false, async : false, success: function(data) { $('.up').empty(); $(".up").html(data); alert($(".loadimg").height()); } }); here is what i am appending echo '<div class="imagediv"> <img src="default.jpg" class="loadimg" /> </div> ';

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• Disabled Select drop down checking through PHP

  - by user541597

  I have a couple of drop down boxes I access through POST with PHP. When the boxes are disabled and not equal to zero I have the program do something. However when they are disabled I do not want them to do anything. The way I check if the boxes are active is by using an if statement if ($_POST['box'] != "blank"){ //do something } So basically I check if the box is not in the default blank position run the if statement. However when it is disabled I am not sure how to check or what kind of value it returns if any. What can I add to the if statement so it will not go into the loop when the boxes are disabled? I tried: if ($_POST['box'] != "blank" || $_POST['box'] != ""){ //do something } But that did not work. Any ideas?

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• Problem with Nulls and an UPDATE statement

  - by Dave

  UPDATE TableA SET Value = a.Value * b.AnotherValue FROM TableA AS a INNER JOIN TableB AS b WHERE (Condition is true); Here is the problem. The Value field for TableA does not allow nulls. If the calculation of a.Value * b.AnotherValue yields a null, an error is thrown. Now the question. Is there any way to tell the UPDATE to ignore the SET phase when the result of the calculation is a null and delete the record rather than updating it. This UPDATE is intended to update hundreds of records at a time but will fail if a single null is encountered. Also, please note that using the ISNULL() function and setting the Value to zero is not acceptable. I would like the record to be dropped if a null is encountered. Many thanks in advance for any help rendered.

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• C++11 initialize array with uniform value in constexpr function

  - by marack

  I have a class template which builds a simple array based on the template parameters as one of its members. I need to be able to initialize every element in the array to a single value in one of the constructors. Unfortunately this constructor must be constexpr. The relevant part boils down to: template <typename T, size_t N> class foo { T data[N]; constexpr foo(T val) { // initialize data with N copies of val } }; Using std::fill or a loop is incompatible with the constexpr requirement. Initializing with : data{val} only sets the first element of the array and zero-initializes the remainder. How can this be achieved? I feel like there should be a solution with variadic templates and tuples etc...

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• List.clear() followed by List.add() not working.

  - by Vincent

  I have the following C# Class/Function: class Hand { private List<Card> myCards = new List<Card>(); public void sortBySuitValue() { IEnumerable<Card> query = from s in myCards orderby (int)s.suit, (int)s.value select s; myCards = new List<Card>(); myCards.AddRange(query); } } On a card Game. This works fine, however, I had trouble at first, instead of using myCards = new List(); to 'reset' myCards, I would use myCards.clear(), however, once I called the clear function, I would not be able to call myCards.add() or myCards.addRange(). The count would stay at zero. Is my current approach good? Is using LINQ to sort my cards good/bad?

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• Get "2:35pm" instead of "02:35PM" from Python date/time?

  - by anonymous coward

  I'm still a bit slow with Python, so I haven't got this figured out beyond what's obviously in the docs, etc. I've worked with Django a bit, where they've added some datetime formatting options via template tags, but in regular python code how can I get the 12-hour hour without a leading zero? Is there a straightforward way to do this? I'm looking at the 2.5 and 2.6 docs for "strftime()" and there doesn't seem to be a formatting option there for this case. Should I be using something else? Feel free to include any other time-formatting tips that aren't obvious from the docs. =)

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• How to open http for linux server

  - by wtfcoder

  I am a Windows (IIS) software engineer, but recently I've been thrown into a Linux server admin role until we can find someone to fill the position. I am not ashamed to admit I have no idea what I am doing. Currently the problem I am trying to solve is that the server is only responding to https requests. However, we need it to respond to standard http requests as well. We don't really have anything that needs to stay secure on its way to the requester. I am running redhat linux via bash. If anyone could tell me how to enable http requests I would really appreciate it! Thanks Please make sure your response is fairly step by step as I have minimal command line experience :/

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• DAQ Triggers in Matlab

  - by RidePlanet

  I'm writing a program that detects the speed of a object by hall effect sensors that are run into MATLAB through a DAQ (MCC USB-1408FS) The problem that has arisen is that I'm using a non-stop scan technique to detect the state of one of 3 sensors. Unfortunately this means that unless the object is rotating past each sensor at the exact rate the program runs, I will see an instantaneous speed (done by comparing the time between two sensors) of zero. I need the sensors to signal the program to count when they are hit, instead of constantly scanning for the signal. How can this be done?

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• How to find the real problem line in my code with Application Verifier ?

  - by Newbie

  I am now trying to use this Application Verifier debugging tool, but i am stuck, first of all: it breaks the program at a line that is simple variable set line (s = 1; for example) Secondly, now when i run this program under debugger, my program seems to have changed its behaviour: i am drawing image, and now one of the colors has changed o_O, all those parts of the image that i dont draw on, has changed the color to #CDCDCD when it should be #000000, and i already set the default color to zero, still it becomes to #CDCDCD. How do i make any sense to this? Here is the output AV gave me: VERIFIER STOP 00000002: pid 0x8C0: Access violation exception. 14873000 : Invalid address causing the exception 004E422C : Code address executing the invalid access 0012EB08 : Exception record 0012EB24 : Context record AVRF: Noncontinuable verifier stop 00000002 encountered. Terminating process ... The program '[2240] test.exe: Native' has exited with code -1073741823 (0xc0000001).

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• binary number comparison

  - by EquinoX

  If I have a 32 bit two's complement number and I want to know what is the easiest way to know of two numbers are equal... what would be the fastest bitwise operator to know this? I know xor'ing both numbers and check if the results are zero works well... any other one's? how about if a number is greater than 0?? I can check the 31'st bit to see if it's greater or equal to 0..but how about bgtz?

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• EF Linq Product Sum when no records returned

  - by user1622713

  I’ve seen variations of this question all over the place but none of the answers work for me. Most of them are just trying to sum a single column too – nothing more complex such as the sum of a product as below: public double Total { get { return _Context.Sales.Where(t => t.Quantity > 0) .DefaultIfEmpty() .Sum(t => t.Quantity * t.Price); } } If no rows are returned I want to return zero. However if no rows are returned the .Sum() fails. There are various options of trying to insert Convert.ToDouble and using null coalesce operators, but they all still gave me errors. I’m sure I am missing a simple way to do this – any help greatly appreciated after too long banging head against google brick wall!

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• Need help with this question: Write Java code which reads numbers from the keyboard.....

  - by Chris

  Write Java code which reads numbers from the keyboard until zero is entered. Only the positive numbers entered are to be added to a variable-sized collection. This is what I have so far: import java.lang.*; import java.util.*; import java.io.*; import java.net.*; public class Demo1App extends Object { public static void main(String[] argStrings) throws Exception { ArrayList myArrayList = new ArrayList(); Scanner input = new Scanner(System.in); System.out.println ("NUMBERS:"); while (int input > 0) { myArrayList.add(input); } while (int input < 0) { System.out.println ("ENTER NUMBERS GREATER THAN 0!"); } } } This code doesn't work, I'm not sure why but any help with it would be appreciated.

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• Restoring a backup SQL Server 2005 where is the data stored?

  - by sc_ray

  I have two Sql Server database instances on two different machines across the network. Lets call these servers A and B. Due to some infrastructural issues, I had to make a complete backup of the database on server A and robocopy the A.bak over to a shared drive accessible by both A and B. What I want is to restore the database on B. My first issue is to restore the backup on server B but the backup location does not display my shared drive. My next issue is that server B's C: drive has barely any space left and there are some additional partitions that have more space and can house my backup file but I am not sure what happens to the data after I restore the database on B. Would the backup data fill up all the available space on C:? It will be great if somebody explain how the data is laid out after the restore database is initiated on a target database server? Thanks

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• Excel: Find a specific cell and paste the value from a control cell into it

  - by G-Edinburgh

  I have two columns one containing the room number, e.g. B-CL102, the other containing a varying integer. I want to enter a different, manually determined, integer in a third column. Whether by macro or native Excel, is there a way to use two control cells at the top of the sheet, type the room number into one and the different integer matching that room into another. I have minimal experience with macros essentially just the basics. I tried to use a V-Lookup formula to look at the two control cells (Range) and then fill in the new column, however I don't know how to then fix that value so that it doesn't change when I change the values in the control cells.

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• WndProc to detect device unplug and plug

  - by Kev Fixx

  How can I know a devices is plug or unplug in WPF? I am using the code below to detect device changes: private void OnSourceInitialized(object sender, EventArgs e) { IntPtr windowHandle = (new WindowInteropHelper(this)).Handle; HwndSource src = HwndSource.FromHwnd(windowHandle); src.AddHook(new HwndSourceHook(WndProc)); } private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { // Handle WM_DEVICECHANGE... if (msg == 0x219) { InitHead(); } return IntPtr.Zero; } Thank you. EDITED: I did the below, still not working: if (msg == 0x0219) { switch (wParam.ToInt32()) { case 0x8000: { InitHead(); } break; } }

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