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• Polling servers at the same port - Threads and Java

  - by John

  Hi there. I'm currently busy working on an IP ban tool for the early versions of Call of Duty 1. (Apparently such a feature wasn't implemented in these versions). I've finished a single threaded application but it won't perform well enough for multiple servers, which is why I am trying to implement threading. Right now, each server has its own thread. I have a Networking class, which has a method; "GetStatus" -- this method is synchronized. This method uses a DatagramSocket to communicate with the server. Since this method is static and synchronized, I shouldn't get in trouble and receive a whole bunch of "Address already in use" exceptions. However, I have a second method named "SendMessage". This method is supposed to send a message to the server. How can I make sure "SendMessage" cannot be invoked when there's already a thread running in "GetStatus", and the other way around? If I make both synchronized, I will still get in trouble if Thread A is opening a socket on Port 99999 and invoking "SendMessage" while Thread B is opening a socket on the same port and invoking "GetStatus"? (Game servers are usually hosted on the same ports) I guess what I am really after is a way to make an entire class synchronized, so that only one method can be invoked and run at a time by a single thread. Hope that what I am trying to accomplish/avoid is made clear in this text. Any help is greatly appreciated.

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• Is this WPF error handling a good idea ?

  - by Adiel

  I have a multi threaded wpf application with various HW interfaces. I want to react to several HW failures that can happen. For example : one of the interfaces is a temperature sensor and i want that from a certain temp. a meesage would appear and notify the user that it happened. i came up with the follwing design : /// <summary> /// This logic reacts to errors that occur during the system run. /// The reaction is set by the component that raised the error. /// </summary> public class ErrorHandlingLogic : Logic { } the above class would consume ErrorEventData that holds all the information about the error that occurred. public class ErrorEventData : IEventData { #region public enum public enum ErrorReaction { } #endregion public enum #region Private Data Memebers and props private ErrorReaction m_ErrorReaction; public ErrorReaction ErrorReactionValue { get { return m_ErrorReaction; } set { m_ErrorReaction = value; } } private string m_Msg; public string Msg { get { return m_Msg; } set { m_Msg = value; } } private string m_ComponentName; public string ComponentName { get { return m_ComponentName; } set { m_ComponentName = value; } } #endregion Private Data Memebers and props public ErrorEventData(ErrorReaction reaction, string msg, string componenetName) { m_ErrorReaction = reaction; m_Msg = msg; m_ComponentName = componenetName; } } the above ErrorHandlingLogic would decide what to do with the ErrorEventData sent to him from various components of the application. if needed it would be forwarded to the GUI to display a message to the user. so what do you think is it a good design ? thanks, Adiel.

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• Use ImageMagick to convert TIFF to PNGs, how to improve the speed?

  - by Woo

  I am using "convert" from IM to get PNGs from multi-page TIFF files, everything is good except the speed. From "convert" documentation, I found: For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. The default PNG compression is 75. So I tried "-quality 0", but almost no changes with the spreed. Anyone can share the ideas of how to improve the spreed? Here are my command: convert 100Pages.tif[0,1,2,3,4,5] -quality 0 100Pages.png Thanks!

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• Need to detect the same application open on another computer on the network. Any software around tha

  - by Joe Schmoe

  I have a time management application that I use at home quite a lot and have running most of the time. At home, I have a desktop PC and a couple of laptops scattered around the house...all networked together. Unfortunately, the application I use is not multi-user and I risk losing/corrupting data if it has been left running on one computer inadvertently while I start using it on another one in another part of the house. I use Live Mesh to automatically keep the application's database synced across the different computers and I just need some way of making sure that I don't start using the application on another computer before closing it down on the previous one. Anyone know of any Windows software that can detect if an application is running simultaneously on different computers on my network, and warn me if I am about to have two open at the same time?

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• Configuration tools for multiple monitors for X / Linux

  - by richard

  I have Ubuntu 10.04 running gnome and two monitors. I am wondering if a can get a better multi-monitor configuration tool. The one I have, gnome-display-properties, has too many problems, including: when I swapped my monitors over, the narrower one now on the left. There is a width calculation error, such that I have a virtual monitor the width of the wide-monitor on the narrow-monitor and part of the wide monitor. And a virtual narrow-monitor on the remainder of the wide-monitor. I would like: nobugs. to be able to select which is primary monitor. to have multiple configurations. configurations to be automatically selected based on which monitors are attached. configurations to be cycled (reliably) when display mode key is pressed. when a display is deactivated, for windows to migrate to remaining monitors. option to not change display resolution when mirroring, but to use side/top blanking bars to pad out screen.

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• Supporting Piping (A Useful Hello World)

  - by blastthisinferno

  I am trying to write a collection of simple C++ programs that follow the basic Unix philosophy by: Make each program do one thing well. Expect the output of every program to become the input to another, as yet unknown, program. I'm having an issue trying to get the output of one to be the input of the other, and getting the output of one be the input of a separate instance of itself. Very briefly, I have a program add which takes arguments and spits out the summation. I want to be able to pipe the output to another add instance. ./add 1 2 | ./add 3 4 That should yield 6 but currently yields 10. I've encountered two problems: The cin waits for user input from the console. I don't want this, and haven't been able to find a simple example showing a the use of standard input stream without querying the user in the console. If someone knows of an example please let me know. I can't figure out how to use standard input while supporting piping. Currently, it appears it does not work. If I issue the command ./add 1 2 | ./add 3 4 it results in 7. The relevant code is below: add.cpp snippet // ... COMMAND LINE PROCESSING ... std::vector<double> numbers = multi.getValue(); // using TCLAP for command line parsing if (numbers.size() > 0) { double sum = numbers[0]; double arg; for (int i=1; i < numbers.size(); i++) { arg = numbers[i]; sum += arg; } std::cout << sum << std::endl; } else { double input; // right now this is test code while I try and get standard input streaming working as expected while (std::cin) { std::cin >> input; std::cout << input << std::endl; } } // ... MORE IRRELEVANT CODE ... So, I guess my question(s) is does anyone see what is incorrect with this code in order to support piping standard input? Are there some well known (or hidden) resources that explain clearly how to implement an example application supporting the basic Unix philosophy? @Chris Lutz I've changed the code to what's below. The problem where cin still waits for user input on the console, and doesn't just take from the standard input passed from the pipe. Am I missing something trivial for handling this? I haven't tried Greg Hewgill's answer yet, but don't see how that would help since the issue is still with cin. // ... COMMAND LINE PROCESSING ... std::vector<double> numbers = multi.getValue(); // using TCLAP for command line parsing double sum = numbers[0]; double arg; for (int i=1; i < numbers.size(); i++) { arg = numbers[i]; sum += arg; } // right now this is test code while I try and get standard input streaming working as expected while (std::cin) { std::cin >> arg; std::cout << arg << std::endl; } std::cout << sum << std::endl; // ... MORE IRRELEVANT CODE ...

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• Reccomendation for tuning 100's of SQL Databases

  - by wayne

  I'm running several SQL servers, each running a few hundred multi-gig databases for customers. They are all setup homogeneously as far as the schemas are concerned, however customer usages of the data differ quite a lot from database to database. What would be the best way to auto-index/profile/tune this large amount of databases? As there are at least 600 or more catalogs I cant have someone manually profile, and index as required by each databases usage patterns. I'm currently running SQL 2005 but will be moving to 2008, so solutions that work with either are fine.

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• Any useful suggestions to figure out where memory is being free'd in a Win32 process?

  - by LeopardSkinPillBoxHat

  An application I am working with is exhibiting the following behaviour: During a particular high-memory operation, the memory usage of the process under Task Manager (Mem Usage stat) reaches a peak of approximately 2.5GB (Note: A registry key has been set to allow this, as usually there is a maximum of 2GB for a process under 32-bit Windows) After the operation is complete, the process size slowly starts decreasing at a rate of 1MB per second. I am trying to figure out the easiest way to quickly determine who is freeing this memory, and where it is being free'd. I am having trouble attaching a memory profiler to my code, and I don't particularly want to override the new/delete operators to track the allocations/deallocations (IOW, I want to do this without re-compiling my code). Can anyone offer any useful suggestions of how I could do this via the Visual Studio debugger? Update I should also mention that it's a multi-threaded application, so pausing the application and analysing the call stack through the debugger is not the most desirable option. I considered freezing different threads one at a time to see if the memory stops reducing, but I'm fairly certain this will cause the application to crash.

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• Looking for a central image database and tagging system for a group of users

  - by jstarek

  I'm doing IT support for a small volunteer organisation who needs to centrally store and organize around 2500 photos. Can anyone here recommend a database or similar system which matches the following criteria: Intuitive to use for users with little computer experience Multi-user support, ideally with integration in our existing LDAP user directory Should have a web-interface Not a hosted solution like Picasa (because we have a rather slow internet connection with very slow upload) Should allow tagging of images, sorting by various criteria and storing copyright information If there are native GNOME and/or Windows clients for the tool, that would be a great benefit. Many thanks in advance!

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• touchscreen in dual monitors but not as primary

  - by bazzjedi

  Hi, I have been looking for information about using a second monitor but thought of using a touchscreen will a touchscreen monitor work in dual set up, but not set up as main monitor which is the question. Can't find any information on this only when others set it has main. only this piece If you mean do the touch screen features still work on the other machine, the answer is yes. Past that, you can even see some of the touch screen features on a non touch screen monitor (just not the multi touch features!) For example, on the taskbar, click (without releasing) on any icon and then drag the mouse up, and you will see that it does the same as using your finger and dragging up. link|flag answered Feb 5 '10 at 15:14 Wil 47.4k125 have hp 2510 main thinking of hp2310ti touchscreen as secondary, grafic card geforce gtx 295- windows 7 professional regards bazzjedi

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• Cisco 2900 series router - 3x 3g HWIC - Can you use the same subnet for each HWIC?

  - by Lance

  We host a site with a 2900 series router with 3x 3G-HWIC cards installed. It is hosted with telstra and plugs into our corporate WAN. The card authenticates against radius and advertises a route into the WAN for which subnet it routes for. We have always used the same advertised subnet on each. Telstra have advised us that this could be the cause of some drop out issues whereby some services will work for some people and not for others and are saying effectively that their system will only use one of these at a time even though we can see the interface is online and assigned a WAN IP address. Has anyone out there configured a multi HWIC setup before and if so are they using different subnets for each or the same?

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• Cheapest High Available Web Server [closed]

  - by xyz

  I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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• mac & windows backup solutions - Offsite Backups

  - by Kristiaan

  Im looking for some advice on a system Im looking to impliment within our company, but so far I have not found an adequate solution too. I need to provide my users with a way to backup there laptops whilst in the office and if possible offsite as well, we have a mixture of Windows & Mac laptops so software should ideally be multi platform. This is the first time i am attempting to-do something like this as we normally charge the users with responsibility for their backups. I have ruled out most of the services like dropbox, sugarsync (unless one exists that does this) as whilst they does exactly what I want it does not give me any control over restoring / recovering data in the event of the user being unavailable, as it requires their account password to access data.

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• Pump Messages During Long Operations + C#

  - by Newbie

  Hi I have a web service that is doing huge computation and is taking more than a minute. I have generated the proxy file of the web service and then from my client end I am using the dll(of course I generated the proxy dll). My client side code is TimeSeries3D t = new TimeSeries3D(); int portfolioId = 4387919; string[] str = new string[2]; str[0] = "MKT_CAP"; DateRange dr = new DateRange(); dr.mStartDate = DateTime.Today; dr.mEndDate = DateTime.Today; Service1 sc = new Service1(); t = sc.GetAttributesForPortfolio(portfolioId, true, str, dr); But since it is taking to much time for the server to compute, after 1 minute I am receiving an error message The CLR has been unable to transition from COM context 0x33caf30 to COM context 0x33cb0a0 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations. Kindly guide me what to do? Thanks

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• How can I install another locale for Firefox?

  - by mfn

  I've installed FF 3.6.3 on a multi-user system with the German language; however I'ld like to have everything in English (interface, etc.) for my user without installing a separate version of FF in english. I've found the setting general.useragent.locale and an extesion, Quick locale switcher, but I don't actually understand where to get the locale from (en_US in my case, I guess). I found pointers directing me to the offical FTP release server with the hint to download the appropriate locale XPI, e.g. from http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.6.3/win32/en-US/ , however there's none.

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• Releasing Autoreleasepool crashes on iOS 4.0 (and only on 4.0)

  - by samsam

  Hi there. I'm wondering what could cause this. I have several methods in my code that i call using performSelectorInBackground. Within each of these methods i have an Autoreleasepool that is being alloced/initialized at the beginning and released at the end of the method. this perfectly works on iOS 3.1.3 / 3.2 / 4.2 / 4.2.1 but it fataly crashes on iOS 4.0 with a EXC_BAD_ACCESS Exception that happens after calling [myPool release]. After I noticed this strange behaviour I was thinking about rewriting portions of my code and to make my app "less parallel" in case that the client os is 4.0. After I did that, the next point where the app crashed was within the ReachabilityCallback-Method from Apples Reachability "Framework". well, now I'm not quite sure what to do. The things i do within my threaded methods is pretty simple xml parsing (no cocoa calls or stuff that would affect the UI). After each method finishes it posts a notification which the coordinating-thread listens to and once all the parallelized methods have finished, the coordinating thread calls viewcontrollers etc... I have absolutely no clue what could cause this weird behaviour. Especially because Apples Code fails as well. any help is greatly appreciated! thanks, sam

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• Protected flash video (requires HAL) on Gentoo

  - by Mala

  I am unable to play "protected" flash video, such as Amazon Prime Instant Video. From what I've read and uncovered, this seems to be due to a lack of HAL being installed on my computer. Confirmation that it is required for protected video can be seen towards the beginning of http://helpx.adobe.com/x-productkb/multi/flash-player-11-problems-playing.html However, hal is not in the gentoo portage tree, and in any case has been deprecated and replaced by udev. How can I go about getting Amazon Prime Instant Video to work again? I was considering grabbing the source from http://www.freedesktop.org/wiki/Software/hal but the links there won't load, and trying to install it from old ebuilds or from overlays which claim to still support it (e.g. kde-sunset) result in a compilation error: In file included from addon-generic-backlight.c:38:0: /usr/include/glib-2.0/glib/gmain.h:21:2: error: #error "Only <glib.h> can be included directly." Has anyone else solved this issue?

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• Wordpress 3 mutli site install

  - by mike

  Hello, Trying to figure out if this is possible... My company has a cms product that was written in Java and we decided to use Wordpress to run blogs for our clients. Obviously, Wordpress does not run on tomcat(at least not by default) so we installed Pound(http://www.apsis.ch/pound/) on our server and have setup any Apache and Tomcat on different ports. When "/blog/" is requested, the request is directed to Apache. This works fine but we would like to use Wordpress multi site so that we can manage all the blogs from a single interface. We would also like the url for every site to be "/blog/" example: http://www.site1.com/blog/ http://www.site2.com/blog/ I'm thinking it would have to be done with apache??? Is it even possible? Thanks!

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• How to move mail accounts when migrating webhosting

  - by pkswatch

  I am migrating my website abc.com from one webhosting company to another in a shared hosting environment. Both have cpanel. And the second hosting account i am preparing to move is my multi-domain hosting account with 3 domains already in it. The problem is, i have many email accounts associated with my website abc.com, which are accessed using webmail. So if i move it to the other host, will i lose all those accounts and their emails? If yes, then how should i synchronise the email accounts so that all the accounts and the contained emails remain intact? I saw some several sync tools like IMAP Sync, etc. But these require two hosts while synchronizing, and as you see, i have just one domain name to be synchronized over 2 servers. PS, i do not have any ssh access on either of them, and i have made complete backup of all files using backup wizard in cpanel.

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• How to troubleshoot if a zip file is valid or if it is big file size to be unzipped ?

  - by mireille raad

  Hello , I am trying to unzip a file with the size of 2GB I am getting the following error : unzip CLTE_C_08.zip Archive: CLTE_C_08.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of CLTE_C_08.zip or CLTE_C_08.zip.zip, and cannot find CLTE_C_08.zip.ZIP, period. After some googling, some people say that this error is because the file is too big, others say because file is corrupt, others say that it could be a not unix archive. So my question , how to find out if file is valid archive file on my Centos and what is the command/trick to uncompress big files ( if any ) Thanks in advance :)

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• Cloud services can't be reached from complex customer infrastructure

  - by Nock

  We have several services running on a cloud, they all are hosted on Windows Server 2012 R2, have public IP address and specific port. Some of our customers can't reach them because for "some reason" the ports are cut between a firewall between them and us. (some customers are using a shared internet connection in a multi tenant office and they can't change firewall communication) Well, you get it, we don't have the possibility to make all the firewall "allowing" the communication. My customers all runs Windows 7 at least. What is the best counter solution in such case, using Microsoft (Windows Server) technologies? The best would be some kind of tunneling communication or VPN, but the customer should also be able to access his/her enterprise resources. Bby the way, today we using IPSec using Windows Firewall to secure the communication, is IPSec tunneling a solution for us? Otherwise, is there a service in Windows to enable some kind of VPN between a client and a server but only for a given set of servers?

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• Best window manager for Linux for Virtual Desktop / Multimon

  - by mattcodes

  Previous used Ubuntu Gnome with Compiz but for my basic spec intel macbook (4 years old) its a little too heavyweight. So for now Im back on my macbook with os x, but now considering going back to Linux. Im looking for a window manager that has the following properties: 1) Supports virtual desktop (need 4 minimum) 2) Works well with multi monitors - can move an app with shortcut from one monitor to the other (on same virtual desktop) 3) Can remember window position (i.e. open vim on 2 monitor) - however must coerce everything back to first window when 2nd screen is unplugged 4) Keyboard shortcut friendly 5) Not too hard to install 6) Works well with minimum hardware such as integrated graphics Please suggest and share your experiences

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• Lightweight window manager for Linux for Virtual Desktop / Multimon

  - by mattcodes

  Previous used Ubuntu Gnome with Compiz but for my basic spec intel macbook (4 years old) its a little too heavyweight. So for now Im back on my macbook with os x, but now considering going back to Linux. Im looking for a window manager that has the following properties: Supports virtual desktop (need 4 minimum) Works well with multi monitors - can move an app with shortcut from one monitor to the other (on same virtual desktop) Can remember window position (i.e. open vim on 2 monitor) - however must coerce everything back to first screen when 2nd screen is unplugged Keyboard shortcut friendly Not too hard to install Works well with minimum hardware such as integrated graphics Please suggest and share your experiences

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• PDF - re/generate image using stream content

  - by tom_tap

  I have pdf file with 8 content streams (bytes) which behave like image layers (but they are not layers that I can turn off/on in Adobe Reader). I would like to extract these images separately, because they overlap each other (thus I am not able to "Take a Snapshot" or "Copy File to Clipboard"). So now I have these streams in below format: <Start Stream> q 599.7601 0 0 71.99921 5951.03423 4282.48177 cm /Im0 Do Q q 599.7601 0 0 71.99921 5951.03432 4210.48177 cm /Im1 Do Q q 599.7601 0 0 71.99921 5951.03441 4138.48177 cm /Im2 Do [...] My question is: how to use these data to generate or regenerate these images to be able to save it as raster or vector file? I have already tried pstoedit, but it doesn't work properly beacuse of these multi streams. Same with PDFedit.

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• selecting files in windows-7 explorer just by hovering

  - by bortao

  One of the biggest annoyances for me of Windows 7 vs Windows XP is that you cant select files properly by hovering over them on Windows Explorer (or multi select by holding ctrl). When i hover an item it gets light blue, not selected. Only after a time or after more hovering, it gets selected. I set the delay (MouseHoverTime) to 1. Windows seems to avoid wrong selection by requiring an additional time or space of mouse hovering before actually selecting the item. I tried playing with the values MouseHoverHeight, MouseHoverWidth, MouseSensitivity, MouseThreshold1 and MouseThreshold2 in HKEY_CURRENT_USER\Control Panel\Mouse, but they seem to have no effect over this. (they are currently on (20, 20, 16, 6, 10, respectively). What i want: to immediately select an item whenever the mouse gets over its bounds.

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