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  • Orbital equations, and power required to run them

    - by Adam Davis
    Due to a discussion on the SO IRC today, I'm curious about orbital mechanics, and The equations needed to solve orbital problems The computing power required to solve complex problems The question in particular is calculating when the Earth will plow into the Sun (or vice versa, depending on the frame of reference). I suspect that all the gravitational pulls within our solar system may need to be calculated, which makes me wonder what type of computer cluster is required, or can this be done on a single box? I don't have the experience to do a back of the napkin test here, but perhaps you do? Also, much thx to Gortok for the original inspiration (see comments).

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  • Multi-variable indexes in postgres

    - by Jackson Davis
    Im looking at an application where I will be doing quite a few SELECTs where I am trying to find column_a = x AND column_b = y. Is the correct to create that index that something like the following? CREATE INDEX index_name ON table (column_a, column_b)

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  • In XAML is there way to bind key press and key release to specific commands?

    - by Ashley Davis
    In my application I have keys that bound to commands using the KeyBinding class. The command is executed when the key is pressed and released. I have a special case where I want to bind separate commands to the pressed action and to the released action. For example when the space key is pressed I want my app to run a command to enter a special mode. Then when the space key is released I want to run another command to exit that special mode. Currently I do this by manually handling the KeyUp and KeyDown events. Is there anyway to execute commands for pressed and released purely in XAML?

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  • Recursion in assembly?

    - by Davis
    I'm trying to get a better grasp of assembly, and I am a little confused about how to recursively call functions when I have to deal with registers, popping/pushing, etc. I am embedding x86 assembly in C++. Here I am trying to make a method which given an array of integers will build a linked list containing these integers in the order they appear in the array. I am doing this by calling a recursive function: insertElem (struct elem *head, struct elem *newElem, int data) -head: head of the list -data: the number that will be inserted at the end of a list -newElem: points to the location in memory where I will store the new element (data field) My problem is that I keep overwriting the registers instead of a typical linked list. For example, if I give it an array {2,3,1,8,3,9} my linked-list will return the first element (head) and only the last element, because the elements keep overwriting each other after head is no longer null. So here my linked list looks something like: 2--9 instead of 2--3--1--8--3--9 I feel like I don't have a grasp on how to organize and handle the registers. newElem is in EBX and just keeps getting rewritten. Thanks in advance!

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  • Enumerating computers in NT4 domain using WNetEnumResourceW (C++) or DirectoryEntry (C#)

    - by Kevin Davis
    I'm trying to enumerate computers in NT4 domains (not Active Directory) and support Unicode NetBIOS names. According to MSDN, WNetEnumResourceW is the Unicode counterpart of WNetEnumResource which to me would imply that using this would do the trick. However, I have not been able to get Unicode NetBIOS names properly using WNetEnumResourceW. I've also tried the C# rough equivalent DirectoryEntry using the WinNT: provider with no luck on Unicode names either. If I use DirectoryEntry on Active Directory (using the LDAP: provider) I do get Unicode names back. I noticed that during some debugging my code using DirectoryEntry and the WinNT: provider, the exceptions I saw were of type System.Runtime.InteropServices.COMException which tends to make me believe that this is just calling WNetEnumResourceW via COM. This web page implies that for some Net APIs the MS documentation is incomplete and possibly inaccurate which further confuses things. Additionally I've found that using the C# method which certainly results in cleaner, more understandable code also yields incomplete results in enumerating computers in domains\workgroups. Does anyone have any insight on this? Is it possible that computer acting as the WINS server is mangling the name? How would I determine this? Thanks

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  • How do I simulate a scrollbar click with jQuery?

    - by Ian Davis
    How do I simulate a scrollbar click with jQuery? So, if a user clicks on a div that says "scroll down," it'll be the exact same behavior as if he/she clicked on the down arrow of the browser's scrollbar. Using the current browser's behavior would be optimal, vs. doing something like $.browser.scrolldown(200,'fast'). Something like $.browser.triggerDownArrowOnScrollBar() would be sweet!

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  • How do I trigger a closing animation for a WPF ContextMenu?

    - by Ashley Davis
    Does anyone know if it is possible to trigger an animation when a WPF ContextMenu closes? I have code that triggers an animation when the ContextMenu is opened. The animation makes the context menu fade into view. I also want an animation when the ContextMenu is closed that makes it fade out. The code that starts the opened fade-in animation looks something like this: var animation = new DoubleAnimation(); animation.From = 0; animation.To = 1; animation.Duration = TimeSpan.FromSeconds(0.2); animation.Freeze(); menu.BeginAnimation(ContextMenu.OpacityProperty, animation); The fade-in animation also runs on sub-menu items. Note that I also want to run other animations besides fade in and fade out. Eg I want the context menu to scale up from nothing so that it sort of 'bounces' into view.

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  • Why doesn't keyboard input work for a ScrollViewer when the child control has input focus?

    - by Ashley Davis
    Why doesn't keyboard input work for a ScrollViewer when the child control has input focus? This is the scenario. A WPF window opens. It sets the focus to a control that is embedded in a ScrollViewer. I hit the up and down and left and right keys. The ScrollViewer doesn't seem to handle the key events, anyone know why? This is the simplest possible example: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" FocusManager.FocusedElement="{Binding ElementName=control}" > <Grid> <ScrollViewer HorizontalScrollBarVisibility="Auto" > <ItemsControl x:Name="control" Width="1000" Height="1000" /> </ScrollViewer> </Grid> </Window> When you start the app that contains this window, "control" appears to have the focus as I intended. Pressing the key seems to result in bubbling key events reaching the ScrollViewer (I checked for this using WPF Snoop). I can't work out why it doesn't respond to the input.

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  • Getting ORACLE programming object definitions

    - by Yaakov Davis
    Let's say I have an ORACLE schema with contains a package. That package defines types, functions, procedures, etc: CREATE PACKAGE... DECLARE FUNCTION ... PROCEDURE ... END; Is there a query I can execute to get the definitions of those individual objects, without the wrapping package?

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  • What is the difference between if ($this-> _hasParam('name') and if($this->_getParam('name')), Ze

    - by Linto davis
    I want to check in zend, whether a posted form value 'name' contains a value.For this i have used the following code one method if ($this->_getPatram('name') != null ) { echo 'field name contains value'; } else { echo 'field name contains no value'; } second method if ($this->_hasParam('name')) { echo 'field name contains value'; } else { echo 'field name contains no value'; } output , when submitting the form with the 'name' field contains no value in first method field name contains no value (result is correct) in second method field name contains value (result is wrong) So what is the difference between these two ? _hasParam and _getParam

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  • Sorting a value pair in Javascript

    - by Bradley M. Davis
    I must be missing the proper term or else I'm sure I could find the answer by searching... in any case, here's what I want to do. Through javascript, I get four variables (A, B, C, and D) that I would like to sort, and still keep track of the variable name (since it's encoded with meaning information). Sample Data: A = 2; B = 1; C = 4; D = 3; What I need to do now is sort them in value order (4,3,2,1) such that I can actually know the variable name ordering (C,D,A,B).

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  • Flex: -frames.frame

    - by Michael Brewer-Davis
    Has anyone used this successfully or found further documentation than just the below (from the Adobe site): frames.frame label class_name [...] Specifies a SWF file frame label with a sequence of class names that are linked onto the frame. This option lets you add asset factories that stream in after the application that then publish their interfaces with the ModuleManager class. The advantage to doing this is that the application starts faster than it would have if the assets had been included in the code, but does not require moving the assets to an external SWF file. This is an advanced option.

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  • Reading PDF form field data from Flex 4 ( via php or coldfusion )

    - by Brian Russel Davis
    Been searching web for an answer for this for a MONTH. I am not an expert in Coldfusion. So supposedly this is easy in CF -- but the mark-up confuses the HECK out of me. So here I am. I have managed to import and read a PDF using the CF Proxy for Actionscript: http://forums.adobe.com/thread/754629?tstart=0 --- BUT --- After all my trouble there, the precious form filed information that I was looking for was not there in the PDF info object. GRRRR. So I am back to looking for a way to do this with CFC's or CFM's or PHP. All I want is this: Read the PDF from a Flex app. GET the form field information. WRITE a new PDF with the form field values. I have found so many close but no cigar options ... and I have tried so many that failed. There are so many free PDF this and that out there. But Adobe seems to reserve the real functionality for themselves. All the free options don't seem to have access to the form data? Anyways I am so exhausted with looking for ways to do this. I need help!

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  • Null reference but it's not?

    - by Clint Davis
    This is related to my previous question but it is a different problem. I have two classes: Server and Database. Public Class Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property Public Sub LoadTables() Dim db As New Database(Me) db.Name = "test" Databases.Add(db) End Sub End Class Public Class Database Private _server As Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Public Property Server() As Server Get Return _server End Get Set(ByVal value As Server) _server = value End Set End Property Public Sub New(ByVal ser As Server) Server = ser End Sub End Class Fairly simple. I use like this: Dim s As New Server s.Name = "Test" s.LoadTables() The problem is in the LoadTables in the Server class. When it hits Databases.Add(db) it gives me a NullReference error (Object reference not set). I don't understand how it is getting that, all the objects are set. Any ideas? Thanks.

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  • Variable Binding Class

    - by Davis
    Hi, I believe this is a tough one... I'm trying to create a collection of variable binding in a class. It is intended to look something like this: Dim x as integer, s as string Dim c as new VBindClass x = 1 s = "Hello" c.Add x, s Debug.Print c.value(x) '= 1 Debug.Print c.value(s) '= "Hello" Is there some function that allow us to retrieve a unique ID for a given variable and also get/set based on variable?

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  • Get information from a higher class?

    - by Clint Davis
    I don't know really how to word the question so please bear with me... I have 3 classes: Server, Database, and Table. Each class has a "Name" property. How I want it to work is that each server can have multiple databases and each database can have multiple tables. So in the Server class I have this property. Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property And I have something similar in the Database class for the tables. This works fine now because I can do something like this to get all the databases in the server. For Each db In s.Databases 's being the server object Debug.Print(db.Name) Next I would like to expand these classes. I want the server class to handle all the connection information and I would like the other classes to use the server class's connection information in them. For example, I setup a server class and set the connection string to the server. Then I want the database class to use serverclass.connectionstring property to connect to the server and get a list of all the databases. But I want to keep that code in the database class. How can I do this? I've attached some code of what I want to do. Public Class Server Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _databases As List(Of Database) Public Property Databases() As List(Of Database) Get Return _databases End Get Set(ByVal value As List(Of Database)) _databases = value End Set End Property End Class '-----New class Public Class Database Private _name As String Public Property Name() As String Get Return _name End Get Set(ByVal value As String) _name = value End Set End Property Private _tables As List(Of Table) Public Property Tables() As List(Of Table) Get Return _tables End Get Set(ByVal value As List(Of Table)) _tables = value End Set End Property 'This is where I need help! Private Sub LoadTables () dim connectionstring as string = server.connectionstring 'Possible? 'Do database stuff End Class Thanks for reading!

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  • Looping in filemaker using a local variable

    - by Mike Davis
    Been programming in C# for a little bit - trying to use file maker and I cant believe it but I cant even get a simple for loop to work. What I want to do is simple: loop through for the amount of entries in my "amountOfRooms" field and create an entry in a table for each room. Sounds so simple, but I cant get it to work. Right now I have this: Set Variable[$cnt[Customers::AmountOfRooms]; value:1] Go to Layout["rooms"(Rooms)] Loop Exit Loop If[$cnt = Customers::AmountOfRooms] New Record / Request Set Variable[$cnt; Value: $cnt + 1] End Loop Exit Script No new records are created. I know the script is running because it does go to my layout, but doesnt create any new records. There is a "Repetition" field for my local variable - not sure how to use that or what it means? Any thoughts on how to do this simple loop? Thanks.

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  • Windows Backup to network share (Server 2008)

    - by Joe
    I'm trying to setup Windows Backup on a Server 2008 machine to backup to a network share. When I run the wizard to setup the backup I get an error message "The user name being used for accessing the remote share folder is not recognized by the local computer". I have no idea what this means. Help? The server with the network share is a domain controller (also server 2008). The server I am trying to back up is not and is not part of the domain.

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  • LiteSpeed enable Access-Control-Allow-Origin (no response header on CORS request)

    - by Joe Coder Guy
    Seriously, I can't find a single page discussing this for litespeed. Using this format in the htaccess "Header set Access-Control-Allow-Origin http://aSite.com" (and https) sends the setting in the http response header, but I still get the "XMLHttpRequest cannot load https://aSite.com/aFile.php. Origin aSite.com is not allowed by Access-Control-Allow-Origin" error when trying to access https from http origin. Also, I receive no response header for https, only that message shows up in Chrome. Is the server still blocking it even though I've sent the proper headers? I read elsewhere that it helps to add these terms Access-Control-Allow-Headers X-Requested-With Access-Control-Allow-Methods OPTIONS, GET, POST Access-Control-Allow-Headers Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, If-Modified-Since, X-File-Name, Cache-Control but I don't see these in my headers. Using these, my PHP files aren't even reached (because they register no errors or anything), so it looks like it comes from the server only, but what do I know. Thanks in advance! Update Since no response header, Prashant seems to suggest it's a server issue in his error since it worked on another server. http://stackoverflow.com/questions/11953132/no-response-obtained-while-implementing-cors Anyone know how to flip this switch? Headers work now Bad litespeed format. Should look like this. Still being denied though. Header set Access-Control-Allow-Headers X-Requested-With Header set Access-Control-Allow-Methods OPTIONS Header set Access-Control-Allow-Methods GET Header set Access-Control-Allow-Methods POST Header set Access-Control-Allow-Headers Content-Type Header set Access-Control-Allow-Headers Depth Header set Access-Control-Allow-Headers User-Agent Header set Access-Control-Allow-Headers X-File-Size Header set Access-Control-Allow-Headers X-Requested-With Header set Access-Control-Allow-Headers If-Modified-Since Header set Access-Control-Allow-Headers X-File-Name Header set Access-Control-Allow-Headers Cache-Control

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  • Litespeed enable Access-Control-Allow-Origin

    - by Joe Coder Guy
    Seriously, I can't find a single page discussing this for litespeed. Using this format in the htaccess "Header set Access-Control-Allow-Origin http://aSite.com" (and https) sends the setting in the header, but I still get the "XMLHttpRequest cannot load https://aSite.com/aFile.php. Origin aSite.com is not allowed by Access-Control-Allow-Origin" error. Is the server still blocking it even though I've sent the proper headers? I read elsewhere that it helps to add these terms Access-Control-Allow-Headers X-Requested-With Access-Control-Allow-Methods OPTIONS, GET, POST Access-Control-Allow-Headers Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, If-Modified-Since, X-File-Name, Cache-Control but I don't see these in my headers. Using these, my PHP files aren't even reached (because they register no errors or anything), so it looks like it comes from the server only, but what do I know. Thanks in advance!

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  • How to debug Ubuntu/Cisco VPN issues

    - by Joe Casadonte
    I'm trying to connect an Ubuntu laptop (9.10) with some kind of Cisco VPN device; I don't know what's on the other end, and I'm not likely to find out exactly what. I know my company allows VPN from Linux clients because they provide one that I cannot get to install (it fails to compile). I've had the most luck with the network-manager-vpnc package, however I can't figure out what's failing. When I try to connect, I get this message from libnotify: The VPN connection 'XXX' failed. which is not very helpful. I've scoured the system logs and all I can find is this: Dec 27 12:57:45 jcasadon-lap NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.vpnc'... Dec 27 12:57:45 jcasadon-lap NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 2672 Dec 27 12:57:45 jcasadon-lap NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' just appeared, activating connections Dec 27 12:58:00 jcasadon-lap NetworkManager: <info> VPN plugin state changed: 3 Dec 27 12:58:00 jcasadon-lap NetworkManager: <info> VPN connection 'AmericasEast' (Connect) reply received. Dec 27 12:58:00 jcasadon-lap NetworkManager: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tun0, iface: tun0) Dec 27 12:58:00 jcasadon-lap kernel: [ 6144.529002] tun0: Disabled Privacy Extensions Dec 27 12:58:00 jcasadon-lap NetworkManager: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tun0, iface: tun0): no ifupdown configuration found. Dec 27 12:58:15 jcasadon-lap NetworkManager: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tun0, iface: tun0) Dec 27 12:58:15 jcasadon-lap NetworkManager: <info> VPN plugin failed: 1 Dec 27 12:58:15 jcasadon-lap NetworkManager: <info> VPN plugin state changed: 6 Dec 27 12:58:15 jcasadon-lap NetworkManager: <info> VPN plugin state change reason: 0 Dec 27 12:58:15 jcasadon-lap NetworkManager: <WARN> connection_state_changed(): Could not process the request because no VPN connection was active. Dec 27 12:58:15 jcasadon-lap NetworkManager: <info> (wlan0): writing resolv.conf to /sbin/resolvconf Dec 27 12:58:15 jcasadon-lap NetworkManager: <info> Policy set 'Northbound Train' (wlan0) as default for routing and DNS. Dec 27 12:58:27 jcasadon-lap NetworkManager: <debug> [1261936707.002971] ensure_killed(): waiting for vpn service pid 2672 to exit Dec 27 12:58:27 jcasadon-lap NetworkManager: <debug> [1261936707.003175] ensure_killed(): vpn service pid 2672 cleaned up I have no idea where to go from here. Tomorrow I'll ask the IT/IS guys if there's anything they can tell me from their end, but I don't know if they'll be able to tell me anything. Any ideas? Thanks!

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  • Using an ATA-100 Hard Drive with a Thermaltake BlacX External Hard Drive Dock

    - by Joe
    Is it possible for a Thermaltake BlacX HDD Dock to connect to and recognize an ATA-100 Hard Drive? I know that the specifications for the BlacX say that it only supports SATA & SATAII, but I was hoping for one of three things: 1) for it to still work even though it isn't supported 2) for there to be some sort of workaround to make this possible 3) for there to be another part of some sort that I could purchase to make this work

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  • West Palm Beach Developers&rsquo; Group Celebrates its Fifth Anniversary as a Member of INETA

    - by Sam Abraham
    Earlier this week marked our fifth anniversary as an INETA group, a fact that we had forgotten but thankfully INETA remembered. In celebrating our membership, INETA sent us a certificate recognizing our membership which we will be sharing with our members at our upcoming meeting. It‘s been a great two-year tenure for me as group co-coordinator working with Venkat Subramanian who had been involved with the group since its inception. Moving into the future we hope to grow both group membership and leadership. We continue to strive to bring added value to our membership which can only happen with your ideas, feedback and involvement in our community-driven group. Our next almost sold-out meeting will be taking place on 8/28/2012 6:30PM (Register at: http://www.fladotnet.com/Reg.aspx?EventID=607) . Will Strohl, DotNetNuke’s Technical Evangelist will be presenting to us an overview on getting started with DNN’s latest 6.2 version all while taking us on a deep dive into its built-in social networking integration features. There is still time to register, but don’t procrastinate! Our September meeting will feature Jonas Stawski, Microsoft MVP sharing with us on SignalR while October will bring us the much anticipated visit by our Microsoft Developer Evangelist Joe Healy who will be talking to us about the latest with Windows 8. Joe will be also presenting in Miami the next day after our event in case you miss his West Palm appearance. We look forward to meeting you at our upcoming meetings. All the best --Sam Abraham

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