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• Syncronise Server Seconds with JS Clients

  - by imperium2335

  I would like to drive a setTimeout loop based on the time of the server, seconds only. So when the seconds on the server is 30, some function is run on all clients. It is vital that they do not become totally out of sync with the server, as there will be a CRON job running on the server every, say, 45 seconds which is important to the system functioning correctly. It is ok if a client is out by a few seconds with the server, client do not need to be synced to each other. I am using Jquery library. Hope this makes sense!

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• Using stored procedures to generate RDLC report in C#

  - by NDraskovic

  I'm making an application that generates reports for my client. I'm using his database that contains stored procedures which return the data needed for the reports. The problem is that I don't know how to execute them from the application (more specific the TableAdapter in my dataset). When I use the visual aid to create the TableAdapter, it shows the error "Invalid object named #table1". This is weird because there is a temporary table called #table1 in the stored procedure. When I try to do the whole job programmatically, I get the exception Incorrect syntax near '.'. An object or column name is missing or empty. For SELECT INTO statements, verify each column has a name. For other statements, look for empty alias names. Aliases defined as "" or [] are not allowed. Change the alias to a valid name. I created a DataTable that has identical structure as the result of the stored procedure, but I still get the same exception

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• Obtain patterns in one file from another using ack or awk or better way than grep?

  - by Rock

  Is there a way to obtain patterns in one file (a list of patterns) from another file using ack as the -f option in grep? I see there is an -f option in ack but it's different with the -f in grep. Perhaps an example will give you a better idea. Suppose I have file1: file1: a c e And file2: file2: a 1 b 2 c 3 d 4 e 5 And I want to obtain all the patterns in file1 from file2 to give: a 1 c 3 e 5 Can ack do this? Otherwise, is there a better way to handle the job (such like awk or using hash) because I have millions of records in both files and really need an efficient way to complete? Thanks!

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• Slow Client connection blocks Mongrel

  - by Sanjay

  I have a Apache + Haproxy + Mongrel setup for my rails application. When I hit a particular server page, mongrel takes around 100ms to process the request and I get the page in around 5 secs due to data transmission time on my slow home connection. Now I see that during these 5 secs of data transmission, mongrel does not serve any other request. I am surprised as that means mongrel is serving the response html to the client and is blocked till the client receives it. Shouldn't serving response be the job of Apache? This puts serious bottleneck in the no of requests Mongrel can serve as that would depend on the speed of the client connection. Is there any way that html generated by mongrel is served by apache/haproxy or any other web server like nginx? I wonder how the other high traffic sites are managing it?

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• Manipulating Exchange 2003 shared contacts folder remotely

  - by andybak

  I've got a CRM web app running on a remote server that needs to synchronise it's contacts with the in-house Exchange 2003 shared contacts. I know very little about Exchange - we are pricing a job for a new client so I'm really just getting a sense of the scope at this stage. Exchange 2003 doesn't seem to support web-services. What would the typical approach to this problem be? My initial instinct would be to open port 80 in the Exchange server, run a simple webserver and POST to it and then talk to exchange via OLE automation scripting (if that's what people are still calling it!) Any other suggestions?

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• How to make flyspell bypass some words by context?

  - by manu

  Hi, I use Emacs for writing most of my writings. I write using reStructuredText, and then transform them to LaTeX after some preprocessing since I write my citations á-la LaTeX. This is an excerpt of one of my texts (in Spanish): En \cite[pp.~XXVIII--XXIX]{Crnkovic2002} se brindan algunos riesgos que se pueden asumir con el desarrollo basado en componentes, los This text is processed by some custom scripts that deals with the \cite part so rst2latex can do its job. When I activate flyspell-mode it signals most of the citation keys as spelling errors. How can I tell flyspell not to spellcheck things within \cite commands. Furthermore, how can I combine rst-mode and flyspell, so that rst-mode would keep flyspell from spellchecking the following? reST comments reST code literal reST directive parameters and arguments reST raw directive contents Any ideas?

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• gVim and multiple programming languages

  - by Abhi

  My day job involves coding with Perl. At home I play around with Python and Erlang. For Perl I want to indent my code with two spaces. Whereas for Python the standard is 4. Also I have some key bindings to open function declarations which I would like to use with all programming languages. How can this be achieved in gVim? As in, is there a way to maintain a configuration file for each programming language or something of that sort?

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• What lessons have you learned about using a wiki as a development tool?

  - by Vivek Kodira

  I'd asked a question a while back about ways to encourage my team to collaborate. The tool we use is a wiki. Since this is the first time we are using the wiki (formally and as a team), we are learning by committing mistakes. One of the lessons has been that a wiki isn't suitable for tracking activities. It is better to use a tool built for-the-job (will elaborate if necessary). Are there other such anti-patterns? What development tasks would you NOT recommend using a wiki for (even though it may seem suitable at first glance)? Edit: Making this a community-wiki since it is probably unlikely that there will be 'one' right answer.

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• MC75 using symbol.imaging.device libraries for program

  - by Christy

  UPDATE: I found another library in the Windows Mobile - CameraCaptureDialog - this did the job - never did figure out the zero length available devices... Hi all, I have a .net application running on a symbol mc75 (motorola) using the scanner. I am now trying to add functionality for the camera and I am running into issues. To find the 'devices' you are supposed to use the library's 'available devices' function. With the barcode it is symbol.barcode.devices.availabledevices and it returns two items (you can scan from the scanner or using the camera device) However, when I do the camera library it does not find any devices - symbol.imaging.devices.availabledevices returns 0 I can take a picture using the software on the mc75, so I know the functionality is there, I just can't figure out how to get to it programmatically.... Does anyone have any ideas? Thanks for any help!

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• Useless variable name in C struct type definition

  - by user1210233

  I'm implementing a linked list in C. Here's a struct that I made, which represents the linked list: typedef struct llist { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list; Isn't the "llist" basically useless. When a client uses this library and makes a new linked list, he would have the following declaration: list myList; So typing llist just before the opening brace is practically useless, right? The following code basically does the same job: typedef struct { struct lnode* head; /* Head pointer either points to a node with data or NULL */ struct lnode* tail; /* Tail pointer either points to a node with data or NULL */ unsigned int size; /* Size of the linked list */ } list;

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• Can I use WCF NET.TCP Protocol from Silverlight 4 for a public website ?

  - by pixel3cs

  Does anyone know if the new NET.TCP feature of Silverlight 4 can be used for public websites ? From what I know, in the Silverlight 4 Beta they announced that WCF NET.TCP can only be used for intranet applications. The reason I am asking this is because I want to recode my Silverlight multiplayer chess game (build with SL 3 Sockets support) based on the new SL 4 WCF TCP communication protocol. My Socket implementation is build from scratch and have big issues with thread safe and few unsolvable bugs from my side. I am sure that SL 4 team did a great job and they simplified all hard part for me, letting us, developers, concentrate more on the game code instead on underlying communication layers.

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• How to use Crypto++ to extract the textual information in a file?

  - by JL

  I have a file that is signed with a certificate located here. CrytoAPI has not worked out for me because of server differences in 2003 / 2008+, and different file inputs. I am now considering using Crypto++ to get the job done. Essentially, all I would like to do is extract the text information from this file, and others like it, and save it as XML. There are some bits in the XML that are marked as < encoded data but those sections are just base64 encoded, so before I can get to the XML envelope, I need to deal with the certificate thats obfuscating the plain text. Anyone with experience in Crypto++ know how this is done? With CrytoAPI, I was doing something like this : byte[] fileContents = File.ReadAllBytes(outFileName); var contentInfo = new ContentInfo(fileContents); var signedCms = new SignedCms(contentInfo); signedCms.Decode(fileContents); signedCms.RemoveSignature(0); byte[] outfileContent = signedCms.ContentInfo.Content;

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• AUTOMATING EXCEL MACRO USING PYTHON

  - by user324056

  Hi all, Here is my question... I am using python in Linux to automate an excel. I have finished writing data into excel by using pyexcelerator package. Now comes the real challenge. I have to add another tab to the existing sheet and that tab should contain the macro run in the first tab. All these things should be automated. I googled a lot and found win32come to do a job in macro, but that was only for windows. Anyone have any idea of how to do this, or can you guide me with few suggestions. Thanks in advance.

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• Image Upload directly from client to remote server? Spring/Tomcat

  - by Prem

  Just wondering what the common solution is for this. We have two web servers that are load balanced and a separate server that holds our images. Our current process is that a user uploads an image directly to the web server (which ever they are connected to) and we enter a job into our DB. Another process checks for image jobs every few mins and copies the image from the web server up to the image server. The delay from when a user uploads to when its visible is not ideal. We could tighten the loop on how often we check for image jobs but ideally I would like to have user uploaded images to go directly to the image server rather than copying twice. How should this be done? Is there anything in spring to deal with this ? Seems like how most would deal with a CDN i would think? I want to limit the time it takes for an image that a user uploads is available on our site...

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• How to make windows media player go to previous song in playlist?

  - by SadSido

  Hi, everyone! I am writing a simple Windows app in c++, that will be able to send commands to windows media player. My problem is that I want my app to move to the previous song in the playlist. IWMPControls::previous() seems to do the job, but its behavior differs from what is written in msdn. In fact this function rewinds current media to the beginning and then (if current position is less than 2-3 seconds) it switches to the previous song. I would like to implement two different buttons (please, don't ask me why :)) - one for rewinding to the beginning, and one - to moving to previous song. Is there any easy way to do this through IWMPControls (or any other WMP-related COM interface)? p.s. I could handle this if I could get the position (index) of the current song in the list. But as far as I read MSDN, it seems to me that there is no easy way to get the current item index from playlist...

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• PHP list of specific files in a directory

  - by Jessica

  The following code will list all the file in a directy <?php if ($handle = opendir('.')) { while (false !== ($file = readdir($handle))) { if ($file != "." && $file != "..") { $thelist .= '<LI><a href="'.$file.'">'.$file.'</a>'; } } closedir($handle); } ?> <P>List of files:</p> <UL> <P><?=$thelist?></p> </UL> While this is very simple code it does it job. I'm now looking for a way to list ONLY file that have .xml (or .XML) at the end, how do I do that? Code is appreciate, thanks! jess

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• Scheduling jobs from a web environment on Linux

  - by Anders Feder

  Hi. I am developing an application in PHP on Linux/Apache. I want to be able to schedule PHP jobs (scripts) for execution at some specific time in the future from within the application. I know that many people will recommend cron and at, but first of all I don't need recurrence (cron) and secondly and most importantly, I need the solution to be able to scale. At was not designed with race condititions in mind, and if two users try to add a job at the same time one or both may fail. It's also important that jobs are executed at their specified time, and not just 'polled' once per minute or so. Can anyone please suggest solutions for this task? Thank you.

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• Sleep a thread until an event is attended in another thread from a different class

  - by Afro Genius

  I have an application that fires 2 threads, the 1st launches another class to do some processing which in turn launches a 3rd class to do yet more processing. The 2nd thread in the main class should wait until some event in the 3rd class completes before it performs its job. How can this be achieved? I had tried implementing a wait/notify to share a lock object between the two threads but technically this will not work as I found the hard way. Can I share a lock between classes? Note, an instance of the 3rd class is declared in the 1st class and passed as parameter to the 2nd class. Also I tried creating boolean value in 3rd class that tells when event is complete then poll 2nd thread till this value is true. This worked but is not very desirable. Also is actionListner a better approach to this problem?

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• Is it better to adopt the same technologies used at work to be effective on your home projects ?

  - by systempuntoout

  Is it better to start developing an home project using the same technologies used at work to be more productive and effective? I'm not talking about a simple hello world web page but an home project with all bells and whistles that one day, maybe, you could sell on internet. This dilemma is often subject of flames between me and a friend. He thinks that if you want to make a great home-made project you need to use the same technologies used daily at work staying in the same scope too; for example, a c++ computer game programmer should develope an home-made c++ game. I'm pretty sure that developing using the same technologies used at work can be more productive at beginning, but surely less exciting and stimulating of working with other languages\ides\libraries out of your daily job. What's your opinion about that?

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• Filter a List via Another

  - by user1166905

  I have a requirement to filter a list of Clients based on if they haven't had any jobs booked in the last x months. In my code I have two lists, one is my Clients and the other is a filtered List of Jobs between today and x months ago and the idea is to filter Clients based on their id not appearing in the jobs list. I tried the following: filteredClients.Where(n => jobsToSearch.Count(j => j.Client == n.ClientID) == 0).ToList(); But I seem to get ALL clients regardless. I can easily do a foreach but this severly slows down the process. How can I filter the client list based on the job list effectively?

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• SSIS - Connection Management Within a Loop

  - by Rob Bowman

  Hi I have the following SSIS package: The problem is that within the Foreach loop a connection is opened and closed for each iteration. On running SQL Profiler I see a series of: Audit Login RPC:Completed Audit Lout The duration for the login and the RPC that actually does the work is minimal. However, the duration for the logout is significant, running into several seconds each. This causes the JOB to run very slowly - taking many hours. I get the same problem when running either on a test server or stand-alone laptop. Could anyone please suggest how I may change the package to improve performance? Also, I have noticed that when running the package from Visual Studio, it looks as though it continues to run with the component blocks going amber then green but actually all the processing has been completed and SQL profiler has dropped silent? Thanks, Rob.

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• Creating An OLEDB Connection From Excel To SQL

  - by Soo

  I am looking to run SQL queries using VBA code in an Excel file. It may sound like a bad way to do things, but the purpose of this is to support legacy functionality on a project I'm working on. I figured out how to create an ODBC connection, but it requires several steps which may be troublesome to implement on many computers, so I'm looking into the possibility of using OLEDB to get the job done. My question is how to go about setting things up so I can run SQL queries in Excel using VBA.

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• Enumerating combinations in a distributed manner

  - by Reyzooti

  I have a problem where I must analyse 500C5 combinations (255244687600) of something. Distributing it over a 10 node cluster where each cluster processes roughly 10^6 combinations per second means the job will be complete in about 7hours. The problem I have is distributing the 255244687600 combinations over the 10 nodes. I'd like to present each node with 25524468760, however the algorithms I'm using can only produce the combinations sequentially, I'd like to be able to pass the set of elements and a range of combination indicies eg: [0-10^7) or [10^7,2.0 10^7) etc and have the nodes themselves figure out the combinations. The algorithms I'm using at the moment are from the following: http://home.roadrunner.com/~hinnant/combinations.html A logical question I've considered using a master node, that enumerates each of the combinations and sends work to each of the nodes, however the overhead incurred in iterating the combinations from a single node and communicating back and forth work is enormous, and will subsequently lead to the master node becoming the bottleneck. Are there any good combination iterating algorithms geared up for efficient/optimal distributed enumeration?

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• WPF custom user widgets. Will UI components be standardized?

  - by Andrew Florko

  There are lots of articles and video lessons that describe how to create your unique user widget (graphical control) with WPF. There are tons of technical details what is behind the scene and I feel people enthusiasm with ability to customize widgets as never before. I remember those days when VCL library (Delphi) appeared and there was the same enthusiasm in VCL widgets area. Ability to create VCL controls was nearly the must when you was applying for a job as Delphi developer. This situation continued for several years till professional sophisticated 3'd party UI libraries appeared. Hardly you'll have to create your own VCL widget nowadays. Will WPF widgets enthusiasm die as VCL one?

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• Best way to search for a saturation value in a sorted list

  - by AB Kolan

  A question from Math Battle. This particular question was also asked to me in one of my job interviews. " A monkey has two coconuts. It is fooling around by throwing coconut down from the balconies of M-storey building. The monkey wants to know the lowest floor when coconut is broken. What is the minimal number of attempts needed to establish that fact? " Conditions: if a coconut is broken, you cannot reuse the same. You are left with only with the other coconut Possible approaches/strategies I can think of are Binary break ups & once you find the floor on which the coconut breaks use upcounting from the last found Binary break up lower index. Window/Slices of smaller sets of floors & use binary break up within the Window/Slice (but on the down side this would require a Slicing algorithm of it's own.) Wondering if there are any other way to do this.

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