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  • Optimizing Smart Client Performance

    - by Burt
    I have a smart client (WPF) that makes calls to the server va services (WCF). The screen I am working on holds a list of objects that it loads when the constructor is called. I am able to add, edit and delete records in the list. Typically what I am doing is after every add or delete I am reloading the entire model from the service again, there are a number off reasons for this including the fact that the data may have changed on the server between calls. This approach has proved to be a big hit on perfomance because I am loading everything sending the list up and down the wire on Add and Edit. What other options are open to me, should I only be send the required information to the server and how would I go about not reloading all the data again ever time an add or delete is performed?

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  • Faster way to perform checks on method arguments

    - by AndyC
    This is mostly just out of curiosity, and is potentially a silly question. :) I have a method like this: public void MyMethod(string arg1, string arg2, int arg3, string arg4, MyClass arg5) { // some magic here } None of the arguments can be null, and none of the string arguments can equal String.Empty. Instead of me having a big list of: if(arg1 == string.Empty || arg1 == null) { throw new ArgumentException("issue with arg1"); } is there a quicker way to just check all the string arguments? Apologies if my question isn't clear. Thanks!

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  • IntelliJ IDEA non standard caret behaviour

    - by Vaat666
    I have an issue with IntelliJ IDEA when selecting a big amount of text, and I cannot find the parameter to set to change that. Here is an example of the situation: My caret is on line 3 I scroll with the mouse wheel towards line 300 I press ctrl + shift I press the left button of the mouse Such an action would result in the text from line 3 to 300 being selected in all common editors (even in MS-Word I think), but not in IntelliJ. Do you know how to set this right? Thanks!

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  • Is Matlab faster than Python?

    - by kame
    I want to compute magnetic fields of some conductors using the biot-savart-law and I want to use a 1000x1000x1000 matrix. Before I use Matlab, but now I want to use Python. Is Python slower than Matlab? How can I make Python faster? EDIT: Maybe the best way is to compute the big array with c/c++ and then transfering them to python. I want to visualise then with VPython. EDIT2: Could somebody give an advice for which is better in my case: C or C++?

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  • ASP.NET Request.ServerVariables["SERVER_PORT_SECURE"] and proxy SSL by load balancer

    - by frankadelic
    We have some legacy ASP.NET code that detects if a request is secure, and redirects to the https version of the page if required. This code uses Request.ServerVariables["SERVER_PORT_SECURE"] to detect if SSL is needed. Our operations team has suggested doing proxy SSL at the load balancer (F5 Big-IP) instead of on the web servers (assume for the purposes of this question that this is a requirement). The consequence would be that all requests appear as HTTP to the web server. My question: how can we let the web servers known that the incoming connection was secure before it hit the load balancer? Can we continue to use Request.ServerVariables["SERVER_PORT_SECURE"]? Do you know of a load balancer config that will send headers so that no application code changes are needed?

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  • PDF Disable Anti-alias on Lines

    - by Travis
    I'm creating a dynamically generated PDF using FPDF. My PDF requires many exactly horizontal/vertical lines in a grid and when rendered they are anti-aliased and look very fuzzy and unacceptable to the client. I need to remove the anti-aliasing for these(or all) lines in the doc. I know this is possible because it's shown correctly in the adobe pdf specs itself http://www.adobe.com/devnet/acrobat/pdfs/PDF32000_2008.pdf (warning: big file) see the box in page 2 for how this should look. How would I duplicate the box shown on this page?

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  • How can I make my Ruby on Rails 2.3.4 application "Rails 3-ready"

    - by marcgg
    I'm developing an application with Ruby on Rails that I want to maintain for at least a few years, so I'm concerned about the next version coming up soon. Going from Rails 1 to Rails 2 was such a big pain that I didn't bother and froze my gems and let the application die, alone, in the dark. On this project I don't want to do that. First because this new version looks awesome, but also because this application may turn into a real product. How can I prepare my application so that it will be upgradable with as little changes as possible. How time consuming do you think switching version will be? And what about my server? Deployment? I'm already looking at deprecation notices... what else can I do?

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  • how can I deploy my silverlight 4 application

    - by Mark
    I have a basic Silverlight 4 project called "MySLApp" which has the associated MySLApp.Web project. (names changed for simplicity) It compiles down into these files (in the silverlight project): AppManifest.xaml MySLApp.dll MySLApp.xap MySLAppTestPage.html And the Web project builds into: Bin\MySLApp.Web.dll ClientBin\MySLApp.xap What I also have in my Web project is a .ASHX file that serves up a generated image, which my Silverlight application calls out to as the URL of an image: var uri = new Uri(@"http://localhost:1122/ImageServer.ashx", UriKind.Absolute); var bi = new BitmapImage(uri); TagImage.Source = bi; My big question boils down to this: How do I deploy my app to my IIS server? What files from where do I need to get it to work? Including the .ASHX url? Cheers, Mark

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  • MYSQL KEY-VALUE PAIR Viability

    - by Amit
    Hi, I am new to mysql and I am looking for some answers to the follwoing questions: a) Can mysql community server can be leveraged for a key-value pair type database.?? b) Which mysql engine is best suited for a key-value pair type database ?? c) Is Mysql cluster a must for horizontal scaling of key-value based datastore or can it be acheived using MySQL replication?? d) Are there any docs or whitepapers for best practices when implementiing a kv datastore on mysql?? e) Are there any known big implementations other that friendfeed doing kv pair using MYSQL?? Would really appreciate some advise from all you Mysql gurus out there !! Thanks In Advance, Amit

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  • In C: sending func pointers, calling the func with it, playing with EIP, jum_buf and longjmp

    - by Yonatan
    Hello Internet ! I need to make sure i understand some basic stuff first: 1. how do i pass function A as a parameter to function B? 2. how do i call function A from inside B ? now for the big whammy: I'm trying to do something along the lines of this: jmp_buf buf; buf.__jmpbuf[JB_PC] = functionA; longjmp(buf,10); meaning that i want to use longjmp in order to go to a function. how should i do it ? thank you very much internet people ! Yonatan

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  • Critiquing my first Python script

    - by tipu
    A little bit of background: I'm building an inverted index for a search engine. I was originally using PHP, but because of the amount of times I needed to write to disk, I wanted to make a threaded indexer. There's a problem with that because PHP is not thread safe. I then tried Java, but I ended up with at least 20 try catch blocks because of the JSON data structure I was using and working with files. The code was just too big and ugly. Then I figured I should pick up some Python because it's flexible like PHP but also thread safe. Though I'm open to all criticism, what I'd like to learn is the shortcuts that the Python language/library provides that I skipped over. This is a PHP-afide Python script because all I really did was translate the PHP script line by line to what I thought was it's Python equivalent. Thanks. http://pastebin.com/xrg7rf9w

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  • How to make an HTTP request in a separate thread with timeout?

    - by Vitaly
    Hi, I haven't programmed in Delphi for a while and frankly didn't think I'll ever have to but... Here I am, desperately trying to find some information on the matter and it's so scarce nowadays, I can't find anything. So maybe you guys could help me out. Currently my application uses Synapse library to make HTTP calls, but it doesn't allow for setting a timeout. Usually, that's not a big problem, but now I absolutely must to have a timeout to handle any connectivity issues nicely. What I'm looking for, is a library (synchronous or not) that will allow making HTTP requests absolutely transparent for the user with no visible or hidden delays. I can't immediately kill a thread right now, and with possibility of many frequent requests to the server that is not responding, it's no good.

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  • Can someone explain this "endian-ness" function for me?

    - by Mike
    Write a program to determine whether a computer is big-endian or little-endian. bool endianness() { int i = 1; char *ptr; ptr = (char*) &i; return (*ptr); } So I have the above function. I don't really get it. ptr = (char*) &i, which I think means a pointer to a character at address of where i is sitting, so if an int is 4 bytes, say ABCD, are we talking about A or D when you call char* on that? and why? Would some one please explain this in more detail? Thanks. So specifically, ptr = (char*) &i; when you cast it to char*, what part of &i do I get?

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  • Are Symphony and CakePHP too slow to be usable?

    - by Aziz Light
    Until now, I have always said that CakePHP is too bloated and slow. I don't really know that, I just saw "some" benchmarks. What I really want to know, is that if those two frameworks (Symfony and CakePHP) are too slow to be usable in a way that the user will get frustrated. I already know that those frameworks are slower than other alternatives, but that's not the question. I ask the question because I want to create a project management web application and I still hesitate between a couple frameworks. I've had some trouble learning Zend, but imho I haven't tried hard enough. So in conclusion, in addition to the first question above, I would like to ask another question: If I want to create a project management tool (which is a pretty big project), which of the following should you suggest, considering the developement time, the speed of the resulting application, and the robustness of the final product: Symphony CakePHP Zend Framework Also I should mention that I don't know any of those frameworks, and that I want to learn one of them (at least).

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  • The unmentioned parts of COBOL's history

    - by be nice to me.
    I'm very curious about old programming languages, especially COBOL, and as Wikipedia couldn't really tell me much about this topic, I decided to ask it here: Was COBOL the first programming language really being used in financial, stock and banking systems? Where exactly was COBOL used? Was it used more frequently than Fortran or BASIC, for example? I don't know if you lived at that time, but how did people react to the rising COBOL? Did they expect it to be the future? When has COBOL actually stopped being used to create new, big systems? Are you sure that there are still important legacy apps written in COBOL out there? I can't believe that somehow.

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  • Ipad, closed environment and threat to privacy

    - by Akshay Bhat
    I had an unusual question about ipad, Since ipad environment is closed and does not allows installation of diagnostic and security related programs. How can then we be sure that any of the software installed on ipad is not infringing upon our privacy by doing stuff such as homing back information, etc. We cant install a packet tracer or any other software to check for attacks on privacy. Also given Apples poor track record (the safari browser was broken in one day), I don't think trusting apple solely would be a good idea. This might not seem to be a big issue but for business users it would be a significant concern.

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  • How do you handle files that can't support concurrent edits in Mercurial?

    - by Scott Whitlock
    I'm using Mercurial with TortoiseHg. Each developer has their own repositories, and there's one central repository on the server for synchronizing our changes. (This will sound lame, but we're using it to manage the source for a legacy VB6 project. Nothing we can do about that...) As has been pointed out elsewhere, there is a big problem in VB6 with merging the .frx (form resources) files. So code changes seem to merge fine, but if two developers both make changes at the same time in the form design view, we can't merge. I'm ok with disallowing concurrent edits, but of course the whole point of Mercurial is that it's distributed so there is no option to force a file to be locked before editing. I don't believe there's a Mercurial solution for this, so I'm wondering: other developers who are using Mercurial for version control, do you have some 3rd party tool that assists with locking files for editing in the cases where it's necessary? Did we make a mistake using Mercurial instead of something like SVN?

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  • Extract strings in python

    - by shadyabhi
    Basically, I want to extract the strings "AAA", "BBB", "CCC", "DDD" from a text file.. ...... (other text goes here)..... <TD align="left" class=texttd><font class='textfont'>AAA</font></TD> ..... (useless text here)..... <TD align="left" class=texttd><font class='textfont'>BBB</font></TD> ....(more text)..... <TD align="left" class=texttd><font class='textfont'>CCC</font></TD> <TD align="left" class=texttd><font class='textfont'>DDD</font></TD> ......(more text)..... I want something like if I do:- data = foo("file.txt") i get:- data = ['AAA','BBB','CCC','DDD'] What is the best possible way? My file is not big..

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  • Quartz2d vector images vs OpenGL vector description?

    - by tbarbe
    How big of a difference is the description language of Quartz2d to OpenGL ES? It seems they are similar in description power... except that Quartz is mostly 2d and that OpenGL is out of the box 3d ( but can be made 2d focused ). Are the mappings from 2dQuartz to 2d OpenGL ES that different? Im sure there must be differences in some specific features that might be handled differently on one vs another... but to do a translator? Anyone have experience with both OpenGL and Quartz2d have some insights?

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  • Write a sql to get the last data

    - by Lu Lu
    Hello everyone, I have a Realtime table with example data: Symbol Date Value ABC 1/3/2009 03:05:01 327 -- is last data for 'ABC' ABC 1/2/2009 03:05:01 326 ABC 1/2/2009 02:05:01 323 ABC 1/2/2009 01:05:01 313 BBC 1/3/2009 03:05:01 458 -- is last data for 'BBC' BBC 1/2/2009 03:05:01 454 BBC 1/2/2009 02:05:01 453 BBC 1/2/2009 01:05:01 423 Please help me to write a sql to return last data for all symbol. The result is: Symbol Date Value ABC 1/3/2009 03:05:01 327 BBC 1/3/2009 03:05:01 458 P/s: I use sql server 2005. And Realtime data is very big, please optimize the sql code. Thanks.

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  • Play wave file using AudioFormat in java

    - by angelina
    Dear all, I m getting following exception while running my code on linux operating system.This code works fine on windows operating system.below is the exception and code used. java.lang.IllegalArgumentException: No line matching interface Clip supporting format PCM_SIGNED unknown sample rate, 16 bit, stereo, 4 bytes/frame, big-endian is supported. AudioFormat format = sourceaudio.getFormat(); format = new AudioFormat( AudioFormat.Encoding.PCM_SIGNED, format.getSampleRate(), format.getSampleSizeInBits() * 2, format.getChannels(), format.getFrameSize() * 2, format.getFrameRate(), true); AudioFileFormat.Type targettype = AudioFileFormat.Type.WAVE; AudioInputStream targetaudiostream = AudioSystem.getAudioInputStream(format, sourceaudio); sourceaudio.close(); targetaudiostream.close(); System.out.println("55555555"); URL url = new URL("http://localhost:8084/newvideo/PCMfile.wav"); Clip clip = AudioSystem.getClip(); AudioInputStream ais = AudioSystem.getAudioInputStream(url); clip.open(ais); System.out.println("seconds: " + (clip.getMicrosecondLength() / 1000000));

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  • How do you diagnose a 500 error on Heroku when there is no error message in the logs?

    - by lala
    I have a Rails app on Heroku that is serving 500 errors at random intervals. Web pages will display "Internal server error" in plain text, instead of the usual "We're sorry. Something went wrong." page. When I refresh the page, it works fine. The logs don't show me an error message, just » 14:20:34.107 2013-10-11 12:20:33.763690+00:00 heroku router - - at=info method=HEAD path=/ host=www.mydomain.com fwd="184.73.237.85/ec2-184-73-237-85.compute-1.amazonaws.com" dyno=web.1 connect=1ms service=63ms status=200 bytes=0 » 14:21:03.957 2013-10-11 12:21:03.561867+00:00 heroku router - - at=info method=GET path=/ host=www.mydomain.com fwd="50.112.95.211/ec2-50-112-95-211.us-west-2.compute.amazonaws.com" dyno=web.1 connect=0ms service=1ms status=500 bytes=21 Support has told me to look at request queuing in New Relic, but New Relic only shows a big red mark saying the server is down (even though the site works fine when refreshed). With no error messages, I'm at a loss for how to diagnose this issue.

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  • how to make tooltip move along with mouse?

    - by George2
    Hello everyone, I am using Silverlight 3 + VSTS 2008. I have a image (Multiscale image control) and I place tooltip on this image. The function of Tooltip works fine. Since the image is big (about 500 * 500 size), and since end user could move mouse on the picture, and I want to display tooltip position along with the mouse (i.e. when mouse moves, I want to tooltip move along with the mouse). Currently, the tooltip displays at a fixed position. Here is my current XAML code, any ideas how to solve this issue? <MultiScaleImage x:Name="msi" Height="500" Width="500"> <ToolTipService.ToolTip> <ToolTip Content="Here is a tool tip" Name="DeepZoomToolTip"></ToolTip> </ToolTipService.ToolTip> </MultiScaleImage> thanks in advance, George

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  • Why Am I Getting MySQL Error #1312 when Using a Simple Stored Procedure?

    - by Laxmidi
    Hi, I'm trying to learn how to use MySQL stored procedures. MySQL accepted my procedure: CREATE PROCEDURE SimpleProc() BEGIN SELECT * FROM myTable; END (In phpMyAdmin, I set // for delimiter. The real version has the name of an actual table instead of myTable.). But, when I call the procedure with CALL SimpleProc();, I get error "#1312 - PROCEDURE mydb.SimpleProc can't return a result set in the given context". I read that some versions of php or phpMyAdmin won't work with stored procedures. I'm using a localhost running on a Mac with MAMP 1.9. I've got MySQL 5.1.44, PHP 5.2.13 & 5.3.2, phpMyAdmin 3.2.5. Does anyone know if stored procedures will work with my set-up? Am I doing something incorrectly? Any advice? Shout out to the Big Red for a triple overtime victory in Lax. Thanks, Laxmidi

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  • Multithreading in Lua

    - by RCIX
    I was having a discussion with my friend the other day. I was saying how that, in pure Lua, you couldn't build a preemptive multitasking system. He claims you can, because of the following reason: Both C and Lua have no inbuilt threading libraries [OP's note: well, Lua technically does, but AFAIK it's not useful for our purposes]. Windows, which is written in mostly C(++) has pre-emptive multitasking, which they built from scratch. Therefore, you should be able to do the same in Lua. The big problem i see with that is that the main way preemptive multitasking works (to my knowledge) is that it generates regular interrupts which the manager uses to get control and determine what code it should be working on next. I also don't think Lua has any facility that can do that. My question is: is it possible to write a pure-Lua library that allows people to have pre-emptive multitasking?

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