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  • twisted .loseConnection does not immediately lose connection?

    - by Claudiu
    I have a server with a few clients connected to it. When CTRL+C is hit (that is, reactor starts shutting down), I want to close all my connections, wait until they are cleanly closed, and then stop. I do this by going through the connected clients' transports and calling .loseConnection(). On the ones that are connected locally, they immediately disconnect. However, on one that is connected through the internet, the connection is not immediately lost. Communication stops - and closing the client program no longer even tells the server that the connection has died, although it does before calling .loseConnection() - but the connection is not deemed 'lost' until a few minutes later after I send a few heartbeat requests from the server. I understand that if a connection dies, there's no way for the server to know unless it tries to send some data. But if I specifically ask for a connection to be closed, why does it not just close/disconnect immediately? Am I calling the wrong function?

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  • Drupal and Back-End Complexity

    - by Brian
    Currently I am working on a school website, and we are still in the decision-making process of choosing a framework (we know that we're not using Joomla! or hand-coding). Drupal came up as a viable choice, and currently, that is my best bet for the site. However, I have an issue with CMS's in general. I would like to develop a quite complicated and specifically custom-suited back-end application for teachers to interact with individual students, including the design of shared/custom calendars, announcement privileges, etc. I currently have a bit of expertise with HTML, CSS, PHP, MySQL, and I could wrap my head around some JavaScript and AJAX stuff if need-be. However, would such a complicated application work with Drupal (in that I could create it to specifically suite my purposes)?

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  • How can I edit a js file sent by the server before it gets to my browser?

    - by pstone
    During a normal browsing session I want to edit a specific javascript file before the browser receives since once it gets there it's impossible to edit. Is there are any tool for this? For what I need it I can't just save it and edit it on my disk. I'm ready to learn how to program it myself but if anyone can point out more or less what I have to do I'd be very grateful. I'd have to intercept the packets until I have the whole file while blocking the browser from receiving it any part of it, then edit it manually and forward it to the same port. I don't think I can do this by just using pcap, I've read a bit about scapy but I'm not sure if it can help me either. Thanks in advance.

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  • Running 2 threads simultaneously

    - by lamsaitat
    In the case of an IM client. I have made 2 separate threads to handle sending packets (by std io) and receiving packets. The question is how to make these 2 threads run simultaneously so that I can keep prompting for input while at the same time be ready to receive packets at any time? I have already tried setting a timer but the data is always lost receiving.

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  • Sequential WSASend() calls - can I rely on TCP to put them on the wire in the posting order?

    - by Poni
    On Windows I/O completion ports, say I do this: void function() { WSASend("1111"); // A WSASend("2222"); // B WSASend("3333"); // C } If I got a "write-complete" that says 3 bytes of WSASend() A were sent, is it possible that right after that I'll get a "write-complete" that tells me that some or all of B & C were sent, or will TCP will hold them until I re-issue a WSASend() call with the rest of A's data? Or will TCP complete it automatically?

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  • [java] run 2 threads simultaneously

    - by lamsaitat
    hi all, in the case of an IM client. i have made 2 separate threads to handle sending packets (by std io) and receiving packets. the question is how to make these 2 threads run simultaneously so that i can keep prompting for input while at the same time be ready to receive packets at any time? i have already tried setting a timer but the data is always lost receiving.

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  • Elegant ways of displaying a GridView with lots of columns (ASP.NET)

    - by Chris
    Hi, just a general design question that I'd like to hear some of your opinions on. I am designing a system for a client, and I'm using GridView' a lot. They need a lot of columns to be displayed in some of these, and I've had to resort to using a panel with a horizontal scrollbar. This presents some issues - keeping track of which row is which is difficult, even with alternating row colours, and it's generally pretty ugly. How have you dealt with these issues before? Are there any sort of AJAX controls that could help, so some data could be only displayed on hover or such? Or any other general ideas.

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  • Refactoring FAT client legacy application

    - by Paul
    I am working on a fat client legacy C++ application which has a lot of business logic mixed in with the presentation side of things. I want to clean things out and refactor the code out completely, so there is a clear seperation of concerns. I am looking at MVC or some other suitable design pattern in order to achieve this. I would like to get recommendations from people who have walked this road before - Do I use MVP or MVC (or another pattern)? What is/are the best practices for undertaking something like this (i.e. useful steps/checks) ?

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  • c++ - what is faster ?

    - by VaioIsBorn
    If we have the following 2 snippets of code in c++ that do the same task: int a, b=somenumber; while(b > 0) { a = b % 3; b /= 3; } or int b=somenumber; while(b > 0) { int a=b%3; b /= 3; } I don't know much about computer architecture/c++ design, but i think that the first code is faster because it declares the integer a at the beginning and just uses it in the while-loop, and in the second code the integer a is being declared everytime the while-loop starts over. Can some one help me with this, am i correct or what and why ?

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  • C++ Inheritance Question

    - by shaz
    I have a base class MessageHandler and 2 derived classes, MessageHandler_CB and MessageHandler_DQ. The derived classes redefine the handleMessage(...) method. MH_DQ processes a message and puts the result in a deque while MH_CB processes the message and then executes a callback function. The base class has a static callback function that I pass along with a this pointer to a library which calls the static callback when a new message is available for processing. My problem comes when I am in the static callback with a void * pointing to either a MH_DQ or a MH_CB. If I cast it to the base class the empty MessageHandler::handleMessage(...) method is called, rather than the version in the appropriate derived class. What is the best way to address this situation from a design perspective and/or what language features might help me to implement a solution to my problem? Thanks in advance!

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  • Sending information down a socket in C#

    - by markyoung1984
    I have built two programs in C# and I am sending simple strings through the sockets. This is fine for the moment but in the near future I will need to send more complicated items, such as objects down the sockets and eventually files. What steps would I take to do this? What purpose do the buffers serve for the sockets/streams? Apologies if I am a little vague.

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  • BlackBerry - Multiple Screens or Single Screen with Content Manager?

    - by Max Gontar
    Hi! I've seen projects which use many screens each one for different layout and functionality. I've seen projects with only one screen (like wizard workflow) where content is changed on user interaction (and this seems to be logical to use single screen in wizards). But also I've seen projects (apps like game or messenger or phone settings utility) which use single screen for different functionalities. I can see such advantages of having single screen in app: keep same decoration design and menu or toolbar (which may be also achieved with inheritance) keep single screen in ui stack (which may be achieved by pop/push screen) easy to handle data over application Can you tell other advantages/disadvantages of single screen app? When its better to use this approach? Thank you!

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  • How to check if internet connection is present in java?

    - by Chris
    How do you check if you can connect to the internet via java? One way would be: final URL url = new URL("http://www.google.com"); final URLConnection conn = url.openConnection(); ... if we got here, we should have net ... But is there something more appropriate to perform that task, especially if you need to do consecutive checks very often and a loss of internet connection is highly probable?

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  • Need help on understanding Mobile First concept

    - by RhymeGuy
    So, I worked on responsive sites before but I'm on my way to build my first responsive site now. I opened some articles on the subject, and boom: Mobile First.. I have no idea how I skipped that concept till now. From the beginning I cant seem to understand whole thing (except that number of mobile devices will take out soon desktop computers) and here is why. How I'm supposed to know how my site will look for desktop version, if I design it for mobile first? I mean, on the smallest device I will have to eventually hide some content etc, how I'm supposed to know what to hide and move things, when I don't know how the site will look on bigger screen? Isn't stripping the things easier?!?! For me (right now), the Mobile First concept looks to me like building pyramid upside down.

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  • Normalization two types of customers into one table

    - by JDewzy
    I am trying to model a sales situation where you can sell to a person or to a business with a contact person. I cannot figure out the proper way to do this. It seems like 2 tables would be incorrect. But how do I model a Customer table that can be a business or a person? Would I just have a boolean for "business" and an additional "business_name" field that would default to Null. But then I have to do an if/then on the columns and that seems like poor design. Any advice, direction, or links is appreciated.

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  • Compare then download

    - by zsjpj
    Hi all ! I have a plist in my document folder of the app with one string, an int value. An another plist is on my server with also a string, an int value. How can i compare the two int value and then do something if one is bigger than the other thanks to all

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  • Norton Ghost EBAB03F1: The specified network name is no longer available.

    - by Breck Carter
    After about 15 minutes, a Norton Ghost 14 backup fails with Error EBAB03F1: The specified network name is no longer available. The source computer is a P4 laptop running Windows XP SP3. The target computer is a Core2 Quad desktop running Windows Vista Ultimate 64bit. It does not help to disable Norton 360 on the source computer or Norton Antivirus 2008 on the target computer. The Event Viewer consistently shows the same two VSS-related errors after Norton Ghost starts but before it fails. It makes no difference if the VSS service is started or stopped. The VSS errors do not appear elsewhere in the event log, only after Ghost starts. The MSS event messages, however, are quite common, appearing throughout the log, and they may have nothing to do with the problem. Here is the Norton Ghost error display... -Errors exist. --Unable to write to file. ---Error EBAB03F1: The specified network name is no longer available. ---Unable to set file size. ----Error EBAB03F1: The specified network name is no longer available. ----Unable to write to file. -----Error EBAB03F1: The specified network name is no longer available. -----Unable to set file size. ------Error EBAB03F1: The specified network name is no longer available. Here are the source computer events, with the final error at the top and the "Ghost Starting" message at the bottom: ===== Event Type: Error Event Source: Norton Ghost Event Category: High Priority Event ID: 100 Date: 11/09/2009 Time: 9:40:26 AM User: N/A Computer: PAVILION2 Description: Error EC8F17B7: Cannot create recovery points for job: Drive Backup of (C:\) (3). Error E7D1001F: Unable to write to file. Error EBAB03F1: The specified network name is no longer available. Error E7D10046: Unable to set file size. Error EBAB03F1: The specified network name is no longer available. Error E7D1001F: Unable to write to file. Error EBAB03F1: The specified network name is no longer available. Error E7D10046: Unable to set file size. Error EBAB03F1: The specified network name is no longer available. Details: 0xEBAB0005 Source: Norton Ghost ===== Event Type: Information Event Source: MSSQL$SQLEXPRESS Event Category: Server Event ID: 3421 Date: 11/09/2009 Time: 9:34:06 AM User: NT AUTHORITY\NETWORK SERVICE Computer: PAVILION2 Description: Recovery completed for database ReportServer$SQLEXPRESSTempDB (database ID 6) in 1 second(s) (analysis 205 ms, redo 0 ms, undo 376 ms.) This is an informational message only. No user action is required. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 5d 0d 00 00 0a 00 00 00 ]....... 0008: 15 00 00 00 50 00 41 00 ....P.A. 0010: 56 00 49 00 4c 00 49 00 V.I.L.I. 0018: 4f 00 4e 00 32 00 5c 00 O.N.2.\. 0020: 53 00 51 00 4c 00 45 00 S.Q.L.E. 0028: 58 00 50 00 52 00 45 00 X.P.R.E. 0030: 53 00 53 00 00 00 18 00 S.S..... 0038: 00 00 52 00 65 00 70 00 ..R.e.p. 0040: 6f 00 72 00 74 00 53 00 o.r.t.S. 0048: 65 00 72 00 76 00 65 00 e.r.v.e. 0050: 72 00 24 00 53 00 51 00 r.$.S.Q. 0058: 4c 00 45 00 58 00 50 00 L.E.X.P. 0060: 52 00 45 00 53 00 53 00 R.E.S.S. 0068: 00 00 .. ===== Event Type: Information Event Source: MSSQL$SQLEXPRESS Event Category: Server Event ID: 17137 Date: 11/09/2009 Time: 9:34:02 AM User: NT AUTHORITY\NETWORK SERVICE Computer: PAVILION2 Description: Starting up database 'ReportServer$SQLEXPRESSTempDB'. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: f1 42 00 00 0a 00 00 00 ñB...... 0008: 15 00 00 00 50 00 41 00 ....P.A. 0010: 56 00 49 00 4c 00 49 00 V.I.L.I. 0018: 4f 00 4e 00 32 00 5c 00 O.N.2.\. 0020: 53 00 51 00 4c 00 45 00 S.Q.L.E. 0028: 58 00 50 00 52 00 45 00 X.P.R.E. 0030: 53 00 53 00 00 00 18 00 S.S..... 0038: 00 00 52 00 65 00 70 00 ..R.e.p. 0040: 6f 00 72 00 74 00 53 00 o.r.t.S. 0048: 65 00 72 00 76 00 65 00 e.r.v.e. 0050: 72 00 24 00 53 00 51 00 r.$.S.Q. 0058: 4c 00 45 00 58 00 50 00 L.E.X.P. 0060: 52 00 45 00 53 00 53 00 R.E.S.S. 0068: 00 00 .. ===== Event Type: Error Event Source: VSS Event Category: None Event ID: 5013 Date: 11/09/2009 Time: 9:28:32 AM User: N/A Computer: PAVILION2 Description: Volume Shadow Copy Service error: Shadow Copy writer ContentIndexingService called routine RegQueryValueExW which failed with status 0x80070002 (converted to 0x800423f4). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 57 53 48 43 4f 4d 4e 43 WSHCOMNC 0008: 32 32 39 32 00 00 00 00 2292.... 0010: 57 53 48 43 49 43 00 00 WSHCIC.. 0018: 32 38 37 00 00 00 00 00 287..... ===== Event Type: Error Event Source: VSS Event Category: None Event ID: 5013 Date: 11/09/2009 Time: 9:28:32 AM User: N/A Computer: PAVILION2 Description: Volume Shadow Copy Service error: Shadow Copy writer ContentIndexingService called routine RegQueryValueExW which failed with status 0x80070002 (converted to 0x800423f4). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 57 53 48 43 4f 4d 4e 43 WSHCOMNC 0008: 32 32 39 32 00 00 00 00 2292.... 0010: 57 53 48 43 49 43 00 00 WSHCIC.. 0018: 32 38 37 00 00 00 00 00 287..... ===== Event Type: Error Event Source: VSS Event Category: None Event ID: 12302 Date: 11/09/2009 Time: 9:28:32 AM User: N/A Computer: PAVILION2 Description: Volume Shadow Copy Service error: An internal inconsistency was detected in trying to contact shadow copy service writers. Please check to see that the Event Service and Volume Shadow Copy Service are operating properly. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 42 55 45 43 58 4d 4c 43 BUECXMLC 0008: 33 36 33 37 00 00 00 00 3637.... 0010: 42 55 45 43 58 4d 4c 43 BUECXMLC 0018: 33 36 30 37 00 00 00 00 3607.... ===== Event Type: Information Event Source: Norton Ghost Event Category: High Priority Event ID: 100 Date: 11/09/2009 Time: 9:27:57 AM User: N/A Computer: PAVILION2 Description: Info 6C8F1F63: The drive-based backup job, Drive Backup of (C:\) (3), has been started manually. Details: Source: Norton Ghost

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  • Can I attach a VPN firewall to an existing network and have it manage VPN connections?

    - by jules
    I'm quite new to networking and am trying to set up my first VPN connection. The Situation: I have been contracted for some programming at a facility some distance from my location. I would like to be able to set up a simple VPN connection to their network so that I may make adjustments without significant travel. Their Current Network: Six devices (one I need to connect to) plugged into a basic router (Dlink). This router has an internet connection and a static ip address. My Hopeful (questionable) Proposal: I attach a VPN Firewall I happen to own (Netgear FVS318) as device number seven on the client network. I disable routing / DHCP in the Netgear. I forward the appropriate IPSec ports from the Dlink to the Netgear. I then create a VPN connection on my office Windows 7 machine to the remote network. The request is forwarded from the Dlink to the Netgear where the VPN connection is authenticated. I now have a remote-access connection from my office PC to the client's local network. The Question: Will this proposal work? If not, would another possibility be to attach a computer with a VPN server to the client network? Also, as a note: the client has requested I not replace their router or place mine in-between theirs and the internet :( Thanks very much!

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  • Linux: multiple network connections - 3G/4G / Wifi / LAN / etc; how can i set a preferred network connection to use?

    - by Alex
    I've been looking at how I can setup a laptop that has multiple network interfaces, but a problem exists if all the connections are active, i.e. 3G, WiFi and LAN are all connected, I would like it to default to LAN. I would like to set "weights" or "priority" to each connection, so that if the LAN is unplugged, it'll default to WiFi - if its in range and working, otherwise, it'll switch and use the 3G dongle; I've been looking around and I can see that the "metric" counter for route isn't being used for recent kernels. I thought that would be able to set the preferred gateway / connections - but according to the man page: man route: OUTPUT Metric The 'distance' to the target (usually counted in hops). It is not used by recent kernels, but may be needed by routing daemons. So I'm confused, are there any scripts / apps / anything that can detect active network connections, and by way of configuration, send my default gateway network traffic through that interface if its active / alive?

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