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• MVVM in a canvas with usercontrols

  - by Mauro Destro

  I have a MVVM WPF application that basically wants to be a single line diagram designer for an electrical distribution network. I have a canvas that must contains transformers, circuit breaker, lines and cables. My big problem is the design... How can i start? I think about a DesignerView, DesignerViewModel that contains an ObservableCollection of IDesignerItemViewModel that is my base class for all the element. But in this case I have to use ItemsControl to bind the content of the canvas to my collection but the pros is that I don't have to create usercontrol for each element but i'll solve most of the problems with DataTemplate (i suppose). Each element viewmodel mantain a link to a model persisted in a repository where i mantain my logical tree. Any hint about how to proceed, I have looked at many DiagramCanvas example but all of those use simple items most like simple rectangle...

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• Problem with persisting inteface collection at design time in winforms, .net

  - by Jules

  The easiest way to explain this problem is to show you some code: Public Interface IAmAnnoyed End Interface Public Class IAmAnnoyedCollection Inherits ObjectModel.Collection(Of IAmAnnoyed) End Class Public Class Anger Implements IAmAnnoyed End Class Public Class MyButton Inherits Button Private _Annoyance As IAmAnnoyedCollection <DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _ Public ReadOnly Property Annoyance() As IAmAnnoyedCollection Get Return _Annoyance End Get End Property Private _InternalAnger As Anger <DesignerSerializationVisibility(DesignerSerializationVisibility.Content)> _ Public ReadOnly Property InternalAnger() As Anger Get Return Me._InternalAnger End Get End Property Public Sub New() Me._Annoyance = New IAmAnnoyedCollection Me._InternalAnger = New Anger Me._Annoyance.Add(Me._InternalAnger) End Sub End Class And this is the code that the designer generates: Private Sub InitializeComponent() Dim Anger1 As Anger = New Anger Me.MyButton1 = New MyButton ' 'MyButton1 ' Me.MyButton1.Annoyance.Add(Anger1) // Should be: Me.MyButton1.Annoyance.Add(Me.MyButton1.InternalAnger) ' 'Form1 ' Me.Controls.Add(Me.MyButton1) End Sub I've added a comment to the above to show how the code should have been generated. Now, if I dispense with the interface and just have a collection of Anger, then it persists correctly. Any ideas?

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• Can not change to a static IP in Fedora 19

  - by user196272

  Im having a bit of a weird situation. Ive installed Fedora Linux 19 onto a virtual machine with no GUI. initially eth0 does not show up when I perform ifconfig. when I run dmesg | grep eth I see the adapter but it says it changed names to p2p1. Once I perform the ifconfig p2p1 up command it shows up. Now when I try to edit the /etc/sysconfig/network-scripts/ifcfg-p2p1, it does not exist. the only scripts that are there lo and enp0s3. If I try to create the ifcfg-p2p1 file with the correct settings, I can not restart the network service. I tried editing the enp0s3 file, but that did not work. Im fairly new to linux and not sure what else to put in here, so if you need any more information just let me know and Ill put it in here.

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• Win 7 accessing large files uses 100% RAM

  - by user181276

  Running Win 7 64-bit SP1 with 8 GB RAM. I first noticed this problem when using the GUI to copy some large (5+ GB) files from one disk to another. What happens is the physical memory in use rises quite quickly to 100% and the system comes to a crawl. If I just start to access the file in a media player (it is a movie) the memory usage climbs up slowly but eventually reaches 100%. When copying the same files via XCOPY I do not have this problem. Using RAMMAP I see most of the memory usage is under "Mapped File" and is allocated under the "Active" column. If I select "Empty System Working Set" the RAM usage drops back down but then starts to climb back up. Any ideas on what I can check/test to eliminate this issue?

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• Can't access stored procedure from entities

  - by molgan

  Hello I'm using entity framework that came with 3.5sp1. And in visual studio I have imported function so it shows under "Function Imports" in the "Model Browser". I have assigned all rights to the user that connects to the database. But it doesnt show in the intellisense when I type "_entities.", only my other entities shows there. I opened the designer file and couldnt find it there either..... The stored procedure should return a scalar datetime value, and not an "entity" What might be wrong here? /M

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• How to SSH into Red Hat Linux (virtual box guest) from Windows 7 (host)?

  - by Gary Hunter

  I have RHEL running in Virtual Box and my native OS is Win 7. From a purely educational standpoint, I want to be able to access RHEL from Win 7 over SSH. I download putty but don;t know how to make it do what I want. Ideally, I would like to use the linux command prompt at a minimum and preferably access the GUI apps also. IS this possible? I am just trying to explore and expand my linux knowledge. Thanks for your time. Gary Hunter

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• How can I delete virtual networks from command line?

  - by David Cobb

  I have Hyper-V Server 2008 R2 (without GUI) running at my colo for a week. I was connected via RDP and could use the menu interface and command line. I figured out how to connect Hyper-V Manager from my Win7 laptop (THANK YOU HVREMOTE!), and created and installed my VM. I created a virtual network that didn't work (no connectivity from my VM) so I created another using different settings, and now have lost access to the Hyper-V host. No ping, no RDP. Since I don't have console access, I cannot troubleshoot. I believe if I deleted the Virtual Networks I'd regain access, but I need a command line instruction for this, that the staff onsite could enter to accomplish this. I find no help anywhere obvious (MSDN, etc), the keywords are too general. Can anyone refer me to simple steps how to do this over command line or with the menu based interface on the console?

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• Will html5 change everything for designers?

  - by Sean Thompson

  What impact do you think html5 will have on the workflow/way graphic design is done for the web? Right now most designers stay in an Adobe tool, doing most of the design work there, and implement some elements with graphics and some with code. Checking out http://www.apple.com/html5/ it seems that almost everything done in a graphic can be done in code. Will designers have to learn very advanced levels of html5 and do the actual design work in the browser or do you see a more "designer friendly" gui being made for html/graphics work? Will tools like photoshop evolve in a way that handles this new lack of image files?

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• How do we group in BIRT without wasting lines, and still only printing the group item on the first l

  - by paxdiablo

  When grouping in BIRT, we frequently want the grouping value to show up on the first line as follows: Group User Reputation ------ --------------- ---------- Admins Bill The Weasel 51,018 Mark Grovel 118,101 Users pax_my_bags 73,554 Jon Scoot **,***,*** <- overflow clueless 92,928 The normal way of acheiving this is to lay out the group in the designer as follws: +---------+--------+--------------+ Tbl Hdr | Group | User | Reputation | +---------+--------+--------------+ Grp Hdr | [Group] | | | +---------+--------+--------------+ Grp Dtl | | [User] | [Reputation] | +---------+--------+--------------+ Grp Ftr | | | | +---------+--------+--------------+ Tbl Ftr | | | | +---------+--------+--------------+ which, unfortunately, lays out the data in exactly that way, with the grouped value on a different line: Group User Reputation ------ --------------- ---------- Admins Bill The Weasel 51,018 Mark Grovel 118,101 Users pax_my_bags 73,554 Jon Scoot **,***,*** <- overflow clueless 92,928 This is particularly painful with data where there's lots of groups with only one user since we use twice as much space as needed. If we move the [Group] data item down to the Grp Dtl line, we get it printed for every line in the group. How, in BIRT, do we merge the two lines Grp Hdr and the first Grp Dtl?

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• upgraded to OSX 10.6.6 - now cannot sudo

  - by rahulk

  I've been using sudo until now. After an upgrade to 10.6.6, now sudo gives me incorrect password. My user has admin rights, and i can execute admin functions from the GUI (such as System Prefs, updating software etc). However, within Terminal, sudo has stopped accepting the password. I have repaired permissions and restarted. Some pointers ask me to use Directory Utility, but in this version it does not have a "set root user" option. I downloaded ServerAdminTool 10.5.7 but this does not work on my system. Some say to add myself to "wheel" group, but i need sudo for that. Some say if i am in admin group, i should be able to sudo, but this is not happening. (Using OS X Snow Leopard 10.6.6, earlier 10.5.8) MODERATOR: please delete this question. The issue had to do with Textpander expanding the password resulting in sudo failing. Not an OS upgrade issue.

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• What should be taken into consideration when deploying Windows 8 in a domain environment?

  - by GaTechThomas

  Edit: Reformulating the question: We have ordered new laptops but before they arrive, our development team is trying to decide whether to install Windows 8 or stick with Windows 7. We have already tested on isolated machines, but we have not yet been allowed to add the machines to the domain. Before we approach the networking group to discuss adding Windows 8 machines to the domain, we need more information on what changes / issues to expect in moving from Windows 7. Are there any aspects we should consider that are specific to Windows 8 clients? Thus far, I've gotten the following feedback: Windows Administrative Shares are disabled New set of Group Policy templates Changes to proxy server settings Additional items along these lines would be helpful. We're not looking for items related to Windows GUI changes, but instead primarily items related to having the machine live and be used on the domain.

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• Mac OSX server command equivalent for dhclient?

  - by John Hall

  Is there an MacOS command that makes a dhcp request, and renews the old lease, drops it for a new one, or usefully reports errors or lack of response from a dhcp server? This would both help fix networking on the machine after problems on the network without rebooting and would also be useful to diagnose wider networking problems from a mac. I can not find any command equivalent of dhclient though obviously some component must be serving this purpose. The question is, is that component exposed to a command line interface? I am biased to the command line for these features and may have overlooked settings panels or tools that might solve it using a gui interface. I believe this question is at the heart of this other question: Is there an equivalent command for 'init.d/networking restart' in OS X

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• Advanced file compression software for Mac OSX

  - by Steven Roose

  Back when I used Windows, I always used WinRAR for file compression and decompression. It had a fair amount of options like 'just storage' vs 'hard compression', password protection and archive type. Now that I use Mac OSX, the only compression possibility I have is the default Finder's Compress to Zip. I downloaded the most popular decompression software "Unarchiver". But this app can't compress other archive types either. I went for a search but there seem to be hardly any good advanced compression tools that work nice in OSX and have the options WinRAR has. (WinRAR works in OSX but command line only, I'm looking for something with a GUI.) Any ideas? I strongly prefer freeware. I found Archiver and StiffIt, but they are both commercial.

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• ext gwt textbox is empty?

  - by user153506

  i have a textbox received from designer.but i wrote action in GWT. the problem is textbox is empty but when textbox is filled by value by pressing button then alert box will be displayed informed that value has been changed. but not worked.help me. TextBox zip1 = null; function onModuleLoad() { zip1 = TextBox.wrap(DOM.getElementById("zip1")); zip1.addChangeHandler(zip1ChangeAction()); } private ChangeHandler zip1ChangeAction() { return new ChangeHandler() { public void onChange(ChangeEvent event) { Window.alert("change fired"); } }; }

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• What kind of knowledge do you need to invent a new programming language?

  - by systempuntoout

  I just finished to read "Coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. Some examples: Joe Armstrong: Inventor of Erlang L. Peter Deutsch: implementer of Smalltalk-80 Brendan Eich: Inventor of JavaScript Dan Ingalls: Smalltalk implementor and designer Simon Peyton Jones: Coinventor of Haskell Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", which is the right approach to studying this fascinating\intimidating\magic topic? What kind of knowledge do you need to model, design and implement a brand new programming language?

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• How can I create a custom OpenOffice / LibreOffice Writer table AutoFormat scheme?

  - by Merlyn Morgan-Graham

  None of the basic table AutoFormat schemes in LibreOffice Writer have both an alternation style defined and no sum column/row style defined. If they have alternation, they always seem to have sums. Because of this I'd like to define my own table scheme. What is the easiest way to accomplish this? A WYSIWYG isn't totally necessary. I am not scared of editing simple XML files as long as I have examples to work from, and if I don't have to edit base install files. If I can place them in a custom area or my user profile directory then that would be best. If there is a way to get the GUI Add functionality to properly recognize an alternation then that would also be helpful.

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• How do you add a certificate for WLAN in Linux, at the command-line?

  - by Neil

  I'm using Maemo on a Nokia n810 Internet tablet, and when given a list of installed certificates to choose from when connecting to a PEAP wireless network, it's always blank. I've already installed a couple of certificates through the gui on the device, and only the certificate authorities show up. I've confirmed that Maemo's connection software that handles certificates is buggy, in such a way that certificates are never added, or properly added certificates cannot be found. Is there a way to add WLAN certificates at the command-line, and connect to a wireless network at the command-line as well? I used to use iwconfig to connect, but I never used it with PEAP. Note: I have nothing in /etc/ssl/certs

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• How can I make a Qt widget ignore style sheets set on parent widgets?

  - by Hisham Abboud

  When adding a QComboBox control in Qt Designer, I get a terrible looking, non-native control, see: http://curiouschap.com/wp-content/uploads/2010/05/stack_qcombobox_question.png [as a newbie, SO wouldn't let me insert the image] On digging further, it turns out that two of the parent controls, QParentWindow and QStackedWidget, have style sheets that QComboBox is inheriting. If I delete the custom styles, then I get a native QComboBox like the one on the left. How can I have QComboBox (and widgets generally) NOT inherit parent styles? Or, how can I create a style for, say, QParentWindow, and do it so that it's local only and does not cascade?

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• To Delete a tape from the ACSLSlibrary

  - by Senthil Kumar

  Hi Anyone there can help me out for an issue as below: There was a stuck tape in the drive and so the stuck tape was removed, but i need to logically delete the tape entry from NB, so that the same media can be inserted back for operations. Netback thinks that the tape is still in that location, hence it should be removed so that the entry is not there and NB does not recognise that the tape in that location, so the same tape can be taken in through inventory. The NB used is NB5.1 Any command to delete this entry, this is a clustered based Environment (Active/Passive), and we use a ACSLS library (Physical) as well a Switch-SN6000(Logical) Kindly help me out as when we tried to delete the media from GUI it said- Could not delete- Cannot delete assigned volume (92).

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• Mac OS X CD ripping speed

  - by SlimSCSI

  I am using vobcopy (installed via macports) to rip DVDs on a mac. I have been doing this for a while on linux with no problems. On the mac however, it is VERY slow. I am guessing that somehow the DVD drive is being limited to 1x in order to keep noise and power consumption down during playback. Is there a way to over ride this? Update: It is MUCH slower than 1x. It has taken me about an hour to copy 300MB Notes: While I appreciate all suggestions, I am not looking for "Have you tried HandBrake?". I am looking for a solution to copy the contents of a DVD, not transcode them. Also, I am launching vobcopy from an apple script that gets executed on DVD insertion, so a GUI solution is not desirable.

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• Mass change Microsoft DNS & IIS server settings

  - by Antonius Bloch

  I need to change about 100 DNS records and IIS configurations on a Windows 2003 web server. The gui doesn't accommodate it and the MS command line tools seem incomplete (for example: dnscmd cannot edit a record, only create). Is there a third party tool out there I can use? Basically I just need to change one IP address to another. <vent It's frustrating that what would take a simple search and replace in Linux is this massive exercise under Windows. I mean IIS 6 wasn't Microsoft's first web platform! What were they thinking??? </vent

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• Open source command line tools for indexing a large number of text files

  - by ergosys

  I'm looking for any open source command line tool or tools which will allow me to index and search a large number of plain text files. Approximate search would be a plus. The tool only needs to print the files that match, although some match context would be useful. A GUI tool isn't useful for my application, nor is anything that searches files one by one (grep for example). I'm basically targeting unix platforms (osx, linux, bsd). EDIT: I'm not interested in any sort of tool that is system-wide, or needs to run in the background. Basically, I want to build an index for a directory tree full of text files and then later be able to search against it. Preferably the index is one or a few files that I can specify the location of. Any ideas?

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• How to easily use Windows 7 search advanced options?

  - by Scott Evernden

  Is there an alternative to trying to remember all the advanced search options? Like an actual GUI as we had for windows XP? As powerful as Windows Search apparently is, I cannot possibly remember all the options available. How is a mere mortal like my Dad supposed to understand and retain all this? I get the shakes every time i need to find something on Win 7. Anyone have some relief? Part 2: Why does it RE-run a search if i add a column and try to sort on that?

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• Which FLOSS text editor is most like kwrite without being KDE-based?

  - by darenw

  Among text editors on Linux, I usually prefer KWrite. I like that I can quickly turn on/off line numbers and line wrap in the View menu. Other settings are easy to change. Other text editors I've used in the past, such as Gnome's gedit, bury line numbering and wrapping checkboxes deeper into the menu system, making it more distracting to change while concentrating on real work. However, KWrite is a KDE app. On Ubuntu it drags in over a dozen other packages, which I suspect I don't really need. Why would a text editor need all that? It's slower to start up than some other editors I've tried. I'm also trying to run an all-gnome system w/o any KDE, just to see how far I get with it. So, what GUI text editor isn't KDE-based, has few dependencies and quick start-up, easy to change line wrap and numbering, and general similarity to KWrite? What comes closest?

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• What kind of knowledge you need to invent a new programming language?

  - by systempuntoout

  I just finished to read "coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. For example: * Joe Armstrong: Inventor of Erlang * L. Peter Deutsch: implementer of Smalltalk-80 * Brendan Eich: Inventor of JavaScript * Dan Ingalls: Smalltalk implementor and designer * Simon Peyton Jones: Coinventor of Haskell * Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", what will you start to study? What kind of knowledge do you need to model, design and implement a brand new programming language?

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