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• How to find good looking font color if background color is known?

  - by Mecki

  There seem to be so many color wheel, color picker, and color matcher web apps out there, where you give one color and the they'll find a couple of other colors that will create a harmonic layout when being used in combination. However most of them focus on background colors only and any text printed on each background color (if text is printed at all in the preview) is either black or white. My problem is different. I know the background color I want to use for a text area. What I need help with is choosing a couple of colors (the more, the merrier) I can use as font colors on this background. Most important is that the color will make sure the font is readable (contrast not being too low, also maybe not being too high to avoid that eyes are stressed) and of course that the combination of foreground and background just looks good. Anyone being aware of such an application? I'd prefer a web application to anything I have to download. Thanks.

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• Could any help me in resource of how to build framework with api like facebook ?

  - by Space Cracker

  we will develop a web site that will have some free services and we want to make it as a framework that can any build application over it or can use its api in their site .. Could any lead me in how to start it , what's the better architecture and design pattern help in that , is there any resources discuss or explain how to do like this ? FYI : we are dot net developers but we can learn any other if its urgently needed in such a solution

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• Rails Controller

  - by Steve

  Hi...In Rails, is it ok to define logic in a controller with a model. For example, take there is an User Model, which is good design. 1)Leaving the UserModel with the CRUD models and moving all the other User Specific actions to a separate controller or 2)Add the user specific actions to the same UserModels Thanks :)

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• Dynamic data-entry value store

  - by simendsjo

  I'm creating a data-entry application where users are allowed to create the entry schema. My first version of this just created a single table per entry schema with each entry spanning a single or multiple columns (for complex types) with the appropriate data type. This allowed for "fast" querying (on small datasets as I didn't index all columns) and simple synchronization where the data-entry was distributed on several databases. I'm not quite happy with this solution though; the only positive thing is the simplicity... I can only store a fixed number of columns. I need to create indexes on all columns. I need to recreate the table on schema changes. Some of my key design criterias are: Very fast querying (Using a simple domain specific query language) Writes doesn't have to be fast Many concurrent users Schemas will change often Schemas might contain many thousand columns The data-entries might be distributed and needs syncronization. Preferable MySQL and SQLite - Databases like DB2 and Oracle is out of the question. Using .Net/Mono I've been thinking of a couple of possible designs, but none of them seems like a good choice. Solution 1: Union like table containing a Type column and one nullable column per type. This avoids joins, but will definitly use a lot of space. Solution 2: Key/value store. All values are stored as string and converted when needed. Also use a lot of space, and of course, I hate having to convert everything to string. Solution 3: Use an xml database or store values as xml. Without any experience I would think this is quite slow (at least for the relational model unless there is some very good xpath support). I also would like to avoid an xml database as other parts of the application fits better as a relational model, and being able to join the data is helpful. I cannot help to think that someone has solved (some of) this already, but I'm unable to find anything. Not quite sure what to search for either... I know market research is doing something like this for their questionnaires, but there are few open source implementations, and the ones I've found doesn't quite fit the bill. PSPP has much of the logic I'm thinking of; primitive column types, many columns, many rows, fast querying and merging. Too bad it doesn't work against a database.. And of course... I don't need 99% of the provided functionality, but a lot of stuff not included. I'm not sure this is the right place to ask such a design related question, but I hope someone here has some tips, know of any existing work, or can point me to a better place to ask such a question. Thanks in advance!

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• 2010 cgi script failure

  - by Barry F

  Hi. I hope you can help, I'm just a beginner! I have listed a few extra details which may not be relevant. I upload cgi scripts onto local/personal directory on a Apache/2.2.10 server, using FTP95Pro in ASCII. The scripts execute correctly using perl on my web-server in a terminal session. Thus my code has no fatal syntax errors. Webpages 'action' each cgi script at /cgi-bin/. There are symbolic links which link system directory files to my local directory files. FollowSymLinks is enabled (unsure how). Permissions are correct (755). This set-up hasnt changed, apparently. The scripts have excuted perfectly for years, up to 2010. But now, in 2010, I have replaced working scripts with new script/files, now with exactly the same text, filename and permissions. Only the date (last modified) has changed. But now I receive a 500 Internal Server Error, and cannot determine why. My server administator assumes I have code errors. But code is unchanged since last year, and it runs fine (albeit no arguments) on web-server console using perl myscript.cgi Is there anything you can think of which may have changed ? I'm suspicious of the new decade. I think the server swapped from Linux to Windows OS last year, but my server administrator got it all working OK. Is there something unusual he may have missed, related to 2010 ? Thank you in advance

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• How to use yahoo UI in my page.

  - by Ayyappan.Anbalagan

  I need to include any dll in my asp.net project?.Is that good to use in web page my page..

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• Looking for software to read PDFs/web pages aloud on OS X

  - by Clinton Blackmore

  I am looking for software that will read PDFs and web pages aloud for me under OS X 10.5, preferably something that is free. I am aware that you can make your Mac read to you by pressing a key combination. It is pretty slick, but I really want something that: will allow me to say, "Read this document" and let me skip paragraphs and pause (instead of simply stopping and then restarting from the beginning) will allow me to skip things that aren't relevant, like page headers, footers, and side bars. will allow me to rewind and listen to something again (either to think on it more deeply, or to understand what the text-to-speech engine was trying to say) for a pdf with text in two columns, will let me read just one column at a time. (Right now if I make a selection, it gets both columns and reads from one and then from another. If I could just select one column and read it, I'd be happier. [IIRC, Apple improved things in Snow Leopard so you can select one column in a pdf.]) I don't really expect one program to do both pdfs and web pages, but it would be nice.

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• SVN, Samba and Symbolic Links. How to get them all to play together?

  - by Camsoft

  I've got a website project under version control that relies on files from an unversioned directory on the same server via Symbolic Links. I'm currently storing the symbolic links in the repository. The idea is that if someone checks out a working copy on to the same server they can edit and test the working copy of the project before committing it back to the repository. When they checkout their working copy it successfully sets up the symlinks so that the entire site works when testing. The users that work on the project are Windows users, so I've set a samba shares on the server and then mapped them to network drives in Windows. People can edit their working copies directly on the server via network shares and then test them in the web browser before committing their changes back to the repository via TortoiseSVN. The Problem The problem I have is that Samba resolves the symlinks as expected but when a user tries to commit their changes back to the repository, TortoiseSVN thinks the linked files are part of the project and tries to commit the target files to the repository and not the symlinks themselves. I tried turning off symlink support in samba which means that the linked files cannot be resolved as I don't really want people to have access to the linked files nor do I want to import the linked files in the repository. The problem with this is that I get Can't stat '\webserver\projects\working\project\symlinked_file.php'. Access is denied Apart from the symlink problem everything else works 100% perfectly. Users can either checkout website projects to their machine and work on them (but can't test) or checkout them out to their space on the dev web server and work on them and fully test. So I don't want to change the workflow process, I just need a solution to the symbolic link issue. Many thanks. Originally posted on StackOverflow: http://stackoverflow.com/questions/2400917/svn-samba-and-symbolic-links-how-to-get-them-all-to-play-together

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• Database normalization question

  - by chchrist

  Hi all, I am trying to make a fashion boutique site. In this site each product (t-shirt,jeans etc) belongs to a collection. Each collection has looks (t-shirt,jean,accessories). A product can belong to one collection and to multiple looks. How should I design the database?

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• What are the benefits of prototypal inheritance over classical?

  - by Pierreten

  So I finally stopped dragging my feet all these years and decided to learn JavaScript "properly". One of the most head-scratching elements of the languages design is it's implementation of inheritance. Having experience in Ruby, I was really happy to see closures and dynamic typing; but for the life of me can't figure out what benefits are to be had from object instances using other instances for inheritance.

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• What compromises Scala made to run on JVM?

  - by Lukasz Lew

  Scala is a wonderful language, but I wonder how could be improved if it had it's own runtime? I.e. what design choices were made because of JVM choice?

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• Remote connection to a Windows 2008 Server Web edition

  - by Lorenzo

  Hello I have just installed Windows 2008 web server to have a development/test site on my office. In the test network I only have 2 machines: Windows server 2008 Web Edition Vista x64 client machine with Visual Studio The client and the server are networked using a NETGEAR router. I have enabled Remote desktop on the server and when I try to connect to it within the Vista client I get the credential window as in the following screenshot. But even if I write the correct credentials I am not able to remote login on the server. Where am I doing wrong? Update 1 I have even tried to create a folder share on the server. But I am not able to access it for the same reason. User or password invalid it says. But this is impossible as I am logging in the server with the same credentials. Update 2 If I try to browse the network from the RDP client I receive a message saying that there are no server running Terminal Services in my network.... :O

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• Which tools are available to reverse engineer a sqlite database?

  - by Edu Zamora

  I would like to obtain the diagram design of a sqlite DB by reverse engineering it, so I can avoid the study of the schema by myself and have an approximate idea of what I am dealing with quite quickly. Do you know of some tool that has this feature?

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• Edit primary keys in Symfony auto-generated admin

  - by madkingbilly

  I need to edit primary keys in several tables. By default, symfony hides primary keys in New/Edit forms. For example, can't edit table 'Tags' with only field 'tag' which is PK. Adding integer ID to this table is not exactly good db design. Thanks in advance for your help.

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• Why is there no string interpolation in Scala?

  - by Alex R

  This is not just an idle quip... I wonder if anybody knows if there's an actual design reason why Scala does not support interpolation similar to Groovy and other "syntactically better Javas"? e.g. var str1 = "World"; var str2 = "Hello, ${str1}";

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• Are GUID primary keys bad in theory, or just practice?

  - by Yarin

  Whenever I design a database I automatically start with an auto-generating GUID primary key for each of my tables (excepting look-up tables) I know I'll never lose sleep over duplicate keys, merging tables, etc. To me it just makes sense philosophically that any given record should be unique across all domains, and that that uniqueness should be represented in a consistent way from table to table. I realize it will never be the most performant option, but putting performance aside, I'd like to know if there are philosophical arguments against this practice?

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• How can I password protect an IIS directory with only FTP access?

  - by Tony Adams

  How can I password protect an IIS directory when I only have FTP access to the server? I can't adjust any IIS settings or add users or anything like that. The answer to: IIS Basic Authorization ala .htaccess/.htpasswd in apache does not help as I only have access to the server via FTP. I just need to password protect a directory. I've tried several variations of a web.config file. I can get a basic HTTP auth form to pop up when a user attempts to load a page from my test directory, but I can't configure the authentication part. The server complains that: Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS. whenever I add an <authentication> section to my web.config. I'm grateful for any help anyone can offer. Edit: I don't know what version of IIS is running on this server, but here is the server tag from error messages: Version Information: Microsoft .NET Framework Version:1.1.4322.2490; ASP.NET Version:1.1.4322.2494

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• Cherrypy web application won't communicate outside localhost via VPN

  - by Geoffrey Shea

  I'm trying to run a Python2.7/Cherrypy web server on Win 7 which is connected to a VPN to establish a dedicate IP address. (If I run the exact same application on Win XP connected to the VPN it works fine.) On Win 7 I tried configuring it to use port 8080, 8005, or 80 with no improvements. I turned off Windows Firewall altogether to test and there was no improvement. If I run Apache on the Win 7 machine on port 80 it works fine so I'm pretty sure it's not the VPN service or router. If I go to WhatismyIP.com it shows that I have the IP address being provided by the VPN. Here is the Python code, but I suspect the problem is the network configuration: import cherrypy class HelloWorld: def index(self): return "Hello world!3" index.exposed = True cherrypy.root = HelloWorld() cherrypy.config.update({"global":{ "server.environment": "production", "server.socketPort": 8005 } }) cherrypy.server.start() This will return a web page if I go to localhost:8005, but not if I go to the VPN IP address:8005 from another machine. As I said, if I run Apache on the Win 7 machine on port 80 I can see it at localhost:80 AND at the VPN IP address:80 from another machine. Thanks for any light you can shed! Geoffrey

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• Execute encrypted files but don't let anybody read them.

  - by Stebi

  I want to provide a virtual machine image with an installed web application. The user should be able to boot the vm (don't login, just boot) and a webserver should start automatically. The point is I want to hide the (ruby) source code of the web application from everyone as there is no obfuscator for ruby. I thought I could use file system encryption to encrypt the directory with the sourcecode (or even a whole partition). But the webserver user must be able to read it automatically after booting. Nobody is allowed to login as the webserver user (or any other user) so no other can read the contents. My questions are now: Is this possible? Because I give away the whole vm everybody could mount its virtual discs and read them (except the encrypted one). Is it now possible to find the key the webserver user needs to decrypt the files and decrypt them manually? Or is it safe to give such a vm away? The problem is that everything needed to decrypt must be included somewhere in the vm else the webserver cannot start automatically. Maybe I'm completely wrong and you have another tip for me securing the source code.

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• how to develop a program to minimize errors in human transcription of hand written surveys

  - by Alex. S.

  I need to develop custom software to do surveys. Questions may be of multiple choice, or free text in a very few cases. I was asked to design a subsystem to check if there is any error in the manual data entry for the multiple choices part. We're trying to speed up the user data entry process and to minimize human input differences between digital forms and the original questionnaires. The surveys are filled with handwritten marks and text by human interviewers, so it's possible to find hard to read marks, or also the user could accidentally select a different value in some question, and we would like to avoid that. The software must include some automatic control to detect possible typing differences. Each answer of the multiple choice questions has the same probability of being selected. This question has two parts: The GUI. The most simple thing I have in mind is to implement the most usable design of the questions display: use of large and readable fonts and space generously the choices. Is there something else? For faster input, I would like to use drop down lists (favoring keyboard over mouse). Given the questions are grouped in sections, I would like to show the answers selected for the questions of that section, but this could slow down the process. Any other ideas? The error checking subsystem. What else can I do to minimize or to check human typos in the multiple choice questions? Is this a solvable problem? is there some statistical methodology to check values that were entered by the users are the same from the hand filled forms? For example, let's suppose the survey has 5 questions, and each has 4 options. Let's say I have n survey forms filled in paper by interviewers, and they're ready to be entered in the software, then how to minimize the accidental differences that can have the manual transcription of the n surveys, without having to double check everything in the 5 questions of the n surveys? My first suggestion is that at the end of the processing of all the hand filled forms, the software could choose some forms randomly to make a double check of the responses in a few instances, but on what criteria can I make this selection? This validation would be enough to cover everything in a significant way? The actual survey is nation level and it has 56 pages with over 200 questions in total, so it will be a lot of hand written pages by many people, and the intention is to reduce the likelihood of errors and to optimize speed in the data entry process. The surveys must filled in paper first, given the complications of taking laptops or handhelds with the interviewers.

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• Suddenly getting lock timeouts with MySQL

  - by Marc Hughes

  We've got a web app hosted on Amazon Web services. Our database is a multi-az RDS MySQL server running 5.1.57 and 3-4 app servers talk to it. Today, we started seeing a lot of errors along the lines of "Lock wait timeout exceeded; try restarting transaction" - almost 1% of POST requests are seeing this. There have been no modifications to the code running on the site. There have been no schema changes. We haven't had a big spike in traffic. I've been looking at the processes running, and none seem out of control. I tried scaling our RDS instance from a small to a large, with no effect. Two days ago, Amazon had some outages. As part of the recovery from that, our RDS server, and our app servers ended up in different availability zones, but all within the same region. But yesterday, everything was fine so I'm not convinced that's related. The lock timeouts are in different types of requests and occur in different InnoDB tables. I have noticed the number of open connections jumped when we started seeing problems, but they may be a symptom and not a cause. What are my next steps in debugging this?

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• What are the reasons *not* to use a GUID for a primary key?

  - by Yarin

  Whenever I design a database I automatically start with an auto-generating GUID primary key for each of my tables (excepting look-up tables) I know I'll never lose sleep over duplicate keys, merging tables, etc. To me it just makes sense philosophically that any given record should be unique across all domains, and that that uniqueness should be represented in a consistent way from table to table. I realize it will never be the most performant option, but putting performance aside, I'd like to know if there are philosophical arguments against this practice?

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• Managing persistent data on an Amazon EC2 web server

  - by Derek

  I've just started trying out Amazon's EC2 service for running an asp.net web app which uses a SQL Server 2005 Express database. I have some questions about how to configure and operate it best for reliability, and I'm hoping to tap into some collective wisdom here as this is my first foray into EC2. Here's how I have it configured currently: OS: Windows 2003 SQL Server Express 2005 Web content stored on an EBS Volume (E Drive) Database Data stored on an EBS Volume (E Drive) Database backups to "C Drive" and then copied off to S3. Elastic IP Address attached to the production instance. Now when I make a change to the OS configuration, I make a new AMI using the bundle feature. Unfortunately, I found that this results in significant downtime. While the bundle is created and the new instance is started. It seems that when I'm ready to make a new AMI, I should: Start up a new temporary instance. Detach the EBS volume from the production instance. Detach the IP Address from the production instance. Attach the IP Address to the temporary instance. Attach the EBS volume to the temporary instance. Create an AMI from the production instance. After the production instance restarts, reverse the attach/detach steps to put it back in production. Is this the right order of events to prevent any chance to corrupt the EBS volume? Will the EBS volume become corrupt if I detach it while a database Write is taking place? Should I snapshot the EBS volume of the production instance and attach it to the temporary instance instead? Or could taking a snapshot of the EBS volume while it's in use cause corruption? Any suggestions to improve the reliability and operations?

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• What are the general factors, that a developer should consider when he starts developing an applicat

  - by Oden

  Hey, I'm new to the development business, and I'm interested in the way, how other programmers start to develop, design an application. What are the main factors that I should consider when sitting down and starting to think about the app? How do you start planning a project?

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• Storing secure keys on Ubuntu web server

  - by Sencha

  I'm running Ubuntu 12.04 Precise with a DUNG (Django, Unix, Nginx & Gunicorn) environment and my app (as well as various config files) is stored in a python virtual environment inside /srv, which the www-data user has access to. The nginx & gunicorn processes are all run as www-data. My web app requires secure credentials which I am storing in an environment.sh file. This file contains various exports and is run using source before the gunicorn processes execute. My concern is the location of the environment.sh file and it's permissions. Will it be okay storing this file inside the /srv folder where the www-data has access to it? Or should it be stored and owned by root somewhere else such as /var/myapp/environment.sh? Also, regarding the www-data user, if any of my web processes (which are run as www-data) are compromised and someone gains access to them, does that mean that the user could potentially read any file on the system, even if they can't write? Including my secure keys?

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