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• How to find distance between two geopoints in c using calculateDistance(const CWaypoint& wp)

  - by Harsha

  void getAllDataByPointer(string *pname,double *platitude, double *plongitude); void getAllDataByReference(string &pname,double &platitude, double &plongitude); double calculateDistance(const CWaypoint& wp); void print(int format); bool less(const CWaypoint& wp_right); CWaypoint add(const CWaypoint& wp_right); These are the functions I am using. I have the values as output but how to call the latitude values of two different cities so that I can use the following formula distance = ERADIUS * (acos(sin(latitude_1)*sin(latitude_2) + cos(latitude_1) * cos(latitude_2)*cos(longitude_2 - longitude_1)));

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• Path Inclusion/Global variable not working?

  - by Dan LaManna

  Simply put, my config file includes my database class, and the config file has in it: global $db; $db = new database(DB_HOST, DB_NAME, DB_USER, DB_PASS); That file is root/config.php Moving on to root/functions/func.newpage.php doesn't have any includes/requires, and uses $db-classfunction since the file I'm working with: root/newpage.php - requires the config file, as well as func.newpage.php. However I still come up with: Undefined variable db. Anything you guys are seeing I'm not? Thanks! Let me know if more details are needed.

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• Solution to grab text from page and display it elsewhere?

  - by GaryW

  I am trying to find a solution how to grab a text from one part of the page to be displayed on a different part of the same page (not stored). To explain this easier. I have this: <div id="test"> hello world </div> I want to grab the text "hello world" and display it somewhere else on the website as well. Im thinking that there might be a javascript code that could grab that specific div text? Any help would be very appreciated.

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• New datatype which can have numbers upto 100 digits.

  - by ckv

  Note: This was an interview question and may not have an actual use case currently The question was to design a class that can store numbers which are very very large say each number can have 100 digits. This new class is a datatype like int. What are the different types of constructors, overloads and other functions that you would write. How can this be further extended to support really large floating point numbers. How this can be given to others so that they can reuse the same component with their own additional functionality. My answer consisted of 2 approaches 1. using array of integers to store every say 10 digits 2. using string itself to store the number and perform operations on individual numbers. What would be the best approach?

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• Qt drag/drop: cannot move when copy is enabled (Ubuntu Gnome)

  - by Scott

  I'm implementing a view and a model where I want to support both moving items internally (by dragging), and copying items (by pressing Ctrl while dragging). I've done everything I need to do according to the instructions. I've set up the mime functions, I've implemented removeRows(), and flags(). The problem is when I drag, it defaults to a copy operation (I get the arrow cursor with a plus sign, and it indeed copies the item by creating a new one in the model). The only difference I can see is this: If I return only Qt::MoveAction in supportedDropActions(), it only moves. If I return (Qt::CopyAction | Qt::MoveAction), it only copies. Any ideas? I want it to work like files in Nautilus (Gnome) or Windows file Explorer: drag moves icons around, ctrl+drag copies them.

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• Byte manipulation in PHP

  - by Michael Angstadt

  In PHP, if you have a variable with binary data, how do you get specific bytes from the data? For example, if I have some data that is 30 bytes long, how do I get the first 8 bytes? Right now, I'm treating it like a string, using the substr() function: $data = //... $first8Bytes = substr($data, 0, 8); Is it safe to use substr with binary data? Or are there other functions that I should be using? Thanks.

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• Use variables entered in login page usable in multiple pages?

  - by deception1

  I have a Login page that captures User input like this. MD5calc ss = new DBCon.MD5calc(); string gs = ss.CalculateMD5Hash(password.Password); int unitID = Convert.ToInt32(Unit_ID.Text); logBO.UnitID = unitID; logBO.UserID = User_name.Text; logBO.UserPass = gs; How would i make them assignable to any other page i created.My Common sense says that creating a static class would be enough,but will it?If i do create a static class where would i put it and how would i call it?I actually need those variable to use in my Sql Stored procedures.

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• How can a Perl force its caller to return? [closed]

  - by JS Bangs

  Possible Duplicate: Is it possible for a Perl subroutine to force its caller to return? I want to write a subroutine which causes the caller to return under certain conditions. This is meant to be used as a shortcut for validating input to a function. What I have so far is: sub needs($$) { my ($condition, $message) = @_; if (not $condition) { print "$message\n"; # would like to return from the *parent* here } return $condition; } sub run_find { my $arg = shift @_; needs $arg, "arg required" or return; needs exists $lang{$arg}, "No such language: $arg" or return; # etc. } The advantage of returning from the caller in needs would then be to avoid having to write the repetitive or return inside run_find and similar functions.

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• How to exclude an array of ids from query in Rails (using ActiveRecord)?

  - by CuriousYogurt

  I would like to perform an ActiveRecord query that returns all records except those records that have certain ids. The ids I would like excluded are stored in an array. So: ids_to_exclude = [1,2,3] array_without_excluded_ids = Item. ??? I'm not sure how to complete the second line. Background: What I've already tried: I'm not sure background is necessary, but I've already tried various combinations of .find and .where. For example: array_without_excluded_ids = Item.find(:all, :conditions => { "id not IN (?)", ids_to_exclude }) array_without_excluded_ids = Item.where( "items.id not IN ?", ids_to_exclude) These fail. This tip might be on the right track, but I have not succeeded in adapting it. Any help would be greatly appreciated.

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• Display images from server in listview

  - by user1451610

  My images are stored in a folder "Albums" and address for those images are "/Albums/..". i want to concatenate two strings in imageurl but its not working and listview is not displaying images:here is my code: <asp:ListView runat="server" ID="listView" OnItemDataBound="ContactsListView_ItemDataBound"> <ItemTemplate> <asp:Image ID="img" ImageUrl= '<%# String.Concat("/", Eval("PictureLink")) %>' runat="server" /> </ItemTemplate> </asp:ListView> any help?

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• I'm storing click coordinates in my db and then reloading them later and showing them on the site wh

  - by trainbolt

  That's it basically. Storing the click coordinates is obviously the simple step, but once I have them if the user comes back and their window is smaller or larger the coordinates are wrong. Am I going about this in the wrong way, should I also store an element id/dom reference or something of that nature. Also, this script will be run over many different websites with more than one layout. Is there a way to do this where the layout is independent of how the coordinates are stored? Thanks.

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• sequencing function calls in javascript - are callbacks the only way?

  - by tim

  I read through various threads like this one for example. But it really escapes me how to accomplish the following: I have 4 functions, and want them happen one after another in sequence. Notice they are in incorrect order, to get my point across. I want the result that will output "1, 2, 3, 4' function firstFunction(){ // some very time consuming asynchronous code... console.log('1'); } function thirdFunction(){ // definitely dont wanna do this until secondFunction is finished console.log('3'); } function secondFunction(){ // waits for firstFunction to be completed console.log('2'); } function fourthFunction(){ // last function, not executed until the other 3 are done. console.log('4'); } I tried to figure out callbacks but am getting lost :( Isn't there some simple way to do this? Like looping through an array...

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• Best Linux filesystem for MySQL with a 100% SELECT workload

  - by gmemon

  I have a MySQL database that contains millions of rows per table and there are 9 tables in total. The database is fully populated, and all I am doing is reads i.e., there are no INSERTs or UPDATEs. Data is stored in MyISAM tables. Given this scenario, which linux file system would work best? Currently, I have xfs. But, I read somewhere that xfs has horrible read performance. Is that true? Should I shift the database to an ext3 file system? Thanks

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• What is the answer to this homework about maps and collections? [closed]

  - by Bishan

  Maps collection is referred to an dictionary because of the way it works. Each entry into a maps collection involves a pair of objects. In a maps collection, an object associates the key which determines where the object is stored in the map. The key object in the maps collection can be duplicated. A stack which has Last In First Out storage mechanism can be considered as a maps collection. I think #1,#2,#3 and #5 are Correct in above, but I have doubt with #5. Am I correct?

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• Call subclass constructor from abstract class in Java

  - by Joel

  public abstract class Parent { private Parent peer; public Parent() { peer = new ??????("to call overloaded constructor"); } public Parent(String someString) { } } public class Child1 extends parent { } public class Child2 extends parent { } When I construct an instance of Child1, I want a "peer" to automatically be constructed which is also of type Child1, and be stored in the peer property. Likewise for Child2, with a peer of type Child2. The problem is, on the assignment of the peer property in the parent class. I can't construct a new Child class by calling new Child1() because then it wouldn't work for Child2. How can I do this? Is there a keyword that I can use that would refer to the child class? Something like new self()?

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• Codeigniter: how do I select count when `$query->num_rows()` doesn't work for me?

  - by mOrloff

  I have a query which is returning a sum, so naturally it returns one row. I need to count the number of records in the DB which made that sum. Here's a sample of the type of query I am talking about (MySQL): SELECT i.id, i.vendor_quote_id, i.product_id_requested, SUM(i.quantity_on_hand) AS qty, COUNT(i.quantity_on_hand) AS count FROM vendor_quote_item AS i JOIN vendor_quote_container AS c ON i.vendor_quote_id = c.id LEFT JOIN company_types ON company_types.company_id = c.company_id WHERE company_types.company_type = 'f' AND i.product_id_requested = 12345678 I have found and am now using the select_min(), select_max(), and select_sum() functions, but my COUNT() is still hard-coded in. The main problem is that I am having to specify the table name in a tightly coupled manner with something like $this->$db->select( 'COUNT(myDbPrefix_vendor_quote_item.quantity_on_hand) AS count' ) which kills portability and makes switching environments a PIA. How can/should I get my the count values I am after with CI in an uncoupled way??

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• SQL query for selecting most recent entries

  - by Mr_Skid_Marks

  A table in my database has a column, DATE_ADDED (stored in seconds). I want to extract all rows with the most recent date (aka largest value for DATE_ADDED). The only solution I have come up with is to SELECT all the rows in ASC (ascending) order, grab the last entry from the table, check the date on this, and perform another SELECT on the table but this time only for the discovered DATE_ADDED. Is it possibly to simplify this series of queries into a single one? My thought is I should be able to do a SELECT on all of the largest values in the table, but I am struggling to come up with a proper query.

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• DOMDocument::load in PHP 5

  - by Abs

  Hello all, I open a 10MB+ XML file several times in my script in different functions: $dom = DOMDocument::load( $file ) or die('couldnt open'); 1) Is the above the old style of loading a document? I am using PHP 5. Oppening it statically? 2) Do I need to close the loading of the XML file, if possible? I suspect its causing memory problems because I loop through the nodes of the XML file several thousand times and sometimes my script just ends abruptly. Thanks all for any help

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• read integers from a file into a vector in C++

  - by user2922063

  I am trying to read an unknown number of double values stored on separate lines from a text file into a vector called rainfall. My code won't compile; I am getting the error no match for 'operator>>' in 'inputFile >> rainfall' for the while loop line. I understand how to read in from a file into an array, but we are required to use vectors for this project and I'm not getting it. I appreciate any tips you can give on my partial code below. vector<double> rainfall; // a vector to hold rainfall data // open file ifstream inputFile("/home/shared/data4.txt"); // test file open if (inputFile) { int count = 0; // count number of items in the file // read the elements in the file into a vector while ( inputFile >> rainfall ) { rainfall.push_back(count); ++count; } // close the file

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• Run ajaxed javascript

  - by user1905698

  I know this has been covered a few times, but I'm completely a noob when it comes to javascript so I have no idea what I'm doing. I am running a javascript that sends variables to a php file and that info is ajaxed into the current page using innerhtml. Here is that part of the code... `function givingHistory(dyear,did) { var divname="giving" + dyear; $.ajax({ url: 'finance/givinghistory.php', type: 'POST', data: { year: dyear, id: did }, success: function(givedata) { document.getElementById(divname).innerHTML = givedata; } }); } ` In the givedata function response from the php file there is a call to another javascript function that is already loaded in my common .js file (so both javascript functions are loaded when the page loads). How do I get the onClick that is added via innerhtml to work? Inside the php file, I check to see if id = a php session variable. If it does it spits out the text that includes the onClick.

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• We have migrated VB6 code to C# in .net.

  - by VB

  The code was migrated using a third party tool. what ever the tool couldnt do, was done by the .net developers, so that all compile issues were fixed. My question is, for such migration activities, do we not bother running unit tests for the functions. Secondly, Could anyone suggest if we should use some tool in VSTS 10 to create a UML model of this code to minimize risks of issues that the client might find. How cumbersome is it. Are there any other suggestions for how quality migrated code can be delivered, in light of the fact that the functionality of the original VB6 application is unknown to us.

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• Remove seconds from the TIME function?

  - by user1876032

  Okay so have a database that uses the time functions for a list of events and then displays the data as: echo "<b>Time Frame:"; echo "$time_start"; echo "&nbsp;-&nbsp;"; echo "$time_end"; Although that displays the time as 11:00:00 if i want the time to be 11:00 am. Is there anyway to make this time display as a standard "11:00"? and also if in the mysql datababse enter it as military time (ex. 13:00) to make it display 1:00pm? I have tried many things. Please help. http://pastebin.com/kaTZzGrx

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• Select value from database and store into a temporary variable

  - by user1616230

  I want to select a stored value from database and then put it into a temporary variable. For example, I have a column called category, one value under it is m, so I want to select this m value from the database, let's say from a table of a database called user_info. Then I want to put it into a variable, let's name it $res. After that, I want to do some condition stuff, such as if $res=="m", Can anyone help me write a simple structure here? Here is the code: <?php $sql = "Select category FROM user_info WHERE user_name = '" .$_SESSION['username']."' and password = '".$_SESSION['password']."'"; $res = mysql_query($sql); if($res == "a"){ include('MPIncomeStrategy.php'); } if($res == "b"){ include('MPIncomeStrategy.php'); } But it seems that the code is not able to detect $res =="category value in database". Did I just use the wrong way to store the category value?

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• Is there a way to write a Python script that creates and executes code?

  - by KaliMa

  Is there a way in Python to create Python code inside the Python script and then execute/test it? My function has the following type of form (as an example) def f(n): if n<=3: return [0, 0, 6, 12][n] return 2*f(n-1) - 4*f(n-2) - 5*f(n-3) + 15*f(n-4) But I want to be able to create these kinds of functions dynamically (or any arbitrary function for that matter) and then test their outputs during runtime (as opposed to copying/pasting this function into the script and then manually testing it). Not sure if this makes sense, please ask for elaboration if needed. I've already looked into eval and exec but couldn't get them to work with entire function definitions, just basic statements like 1+2, etc.

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• How to design a database where the main entity table has 25+ columns but a single entity's columns g

  - by thenextwebguy

  The entities to be stored have 25+ properties (table columns). The entities are pretty diverse, meaning that, most of the columns are empty. On average, I'd say, less than 20% (<5) properties have a value in any particular item. So, I have a lot of redundant empty columns for most of the table rows. Almost all of the columns are decimal numbers. Given this scenario, would you suggest serializing the columns instead, or perhaps, create another table named "Property", which would contain all the possible properties and then creating yet another table "EntityProperty" which would map an property to an entity using foreign keys? Or would you leave it as it is?

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