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  • iPhone GUI for real-time log message display

    - by zer0stimulus
    My goal is to have a screen on my GUI dedicated to logging real-time messages generated by my internal components. A certain limit will be set on the log messages so that older messages are pruned. I'm thinking about implementing using a UITextView with a NSMutableString to store the output. I would have to perform manual pruning somehow on the NSMutableString object. Is a better way to implement this?

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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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  • Auto accept outlook VBA

    - by Russ
    Is there a VB macro or some sort of add-on out there that will allow me to auto accept invitations in outlook by sender or by folder? I was thinking about doing a VB script for this but I don't want to re-invent the wheel?

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  • What is the recommended approach towards multi-tenant databases in MongoDB?

    - by Braintapper
    I'm thinking of creating a multi-tenant app using MongoDB. I don't have any guesses in terms of how many tenants I'd have yet, but I would like to be able to scale into the thousands. I can think of three strategies: All tenants in the same collection, using tenant-specific fields for security 1 Collection per tenant in a single shared DB 1 Database per tenant The voice in my head is suggesting that I go with option 2. Thoughts and implications, anyone?

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  • Get HTML element informations in .NET

    - by martin.malek
    Hi, I'm just thinking if there is any way how to get information about element in HTML in my .NET application. The input is HTML page and path to CSS files etc. I want to take e.g. H1 tag and found what will be the CSS for it. Is there any code or can I use IE and try to take this information from it automatically inside of my application?

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  • Are there programs that iteratively write new programs?

    - by chris
    For about a year I have been thinking about writing a program that writes programs. This would primarily be a playful exercise that might teach me some new concepts. My inspiration came from negentropy and the ability for order to emerge from chaos and new chaos to arise out of order in infinite succession. To be more specific, the program would start by writing a short random string. If the string compiles the programs will log it for later comparison. If the string does not compile the program will try to rewrite it until it does compile. As more strings (mini 'useless' programs) are logged they can be parsed for similarities and used to generate a grammar. This grammar can then be drawn on to write more strings that have a higher probability of compilation than purely random strings. This is obviously more than a little silly, but I thought it would be fun to try and grow a program like this. And as a byproduct I get a bunch of unique programs that I can visualize and call art. I'll probably write this in Ruby due to its simple syntax and dynamic compilation and then I will visualize in processing using ruby-processing. What I would like to know is: Is there a name for this type of programming? What currently exists in this field? Who are the primary contributors? BONUS! - In what ways can I procedurally assign value to output programs beyond compiles(y/n)? I may want to extend the functionality of this program to generate a program based on parameters, but I want the program to define those parameters through running the programs that compile and assigning meaning to the programs output. This question is probably more involved than reasonable for a bonus, but if you can think of a simple way to get something like this done in less than 23 lines or one hyperlink, please toss it into your response. I know that this is not quite meta-programming and from the little I know of AI and generative algorithms they are usually more goal oriented than what I am thinking. What would be optimal is a program that continually rewrites and improves itself so I don't have to ^_^

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  • What are some fun project ideas for a new Python developer?

    - by Sergio Tapia
    I'm new to Python 3 and so far it seems like a decent language. I really like the string manipulation methods you can use and they are pretty radical. :) I'm stuck however in thinking of a project to do with Python. Is there a site similar to Coding4Fun but for Python? Community Wiki because I think this question is really interesting. :D

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  • Ruby on Rails: Accessing production database data for testing

    - by williamjones
    With Ruby on Rails, is there a way for me to dump my production database into a form that the test part of Rails can access? I'm thinking either a way to turn the production database into fixtures, or else a way to migrate data from the production database into the test database that will not get routinely cleared out by Rails. I'd like to use this data for a variety of tests, but foremost in my mind is using real data with the performance tests, so that I can get a realistic understanding of load times.

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  • Lighttpd check request headers in configuration

    - by Mike Hayes
    Hi I was wondering if it was possible in the configuration of Lighttpd to read request headers, I've searched and searched.. apparently it's not possible. For example, conditional configuration based upon IP address: $HTTP["remoteip"] == "0.0.0.0" { // Do something } Is there something similar to check headers, for example: $HTTP["X-Some-Header"] == "Value" { // Do something } I'm thinking there isn't but thought I would post here as a last resort. Google didn't help much, and Lighttpd documentation would suggest this is not possible. Thanks Mike

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  • Good Idea for ISI paper

    - by Nasser Hajloo
    I'm looking for an idea to write an ISI paper. till now,I'm thinking to write something about Formal Methods but I'm not sure. So What do you suggest I want to change the subject and still looking for new ideas. What is a good subject for an ISI paper

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  • Are there legitimate uses for JavaScript's "with" statement?

    - by Shog9
    Alan Storm's comments in response to my answer regarding the with statement got me thinking. I've seldom found a reason to use this particular language feature, and had never given much thought to how it might cause trouble. Now, I'm curious as to how I might make effective use of with, while avoiding its pitfalls... So my question is, where have you found the with statement useful?

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  • Good object/DB set-up for CMS-esque app for managing content and user permissions?

    - by sah302
    Hi all, so I am writing a big CMS-esque app to allow users to manage web content through web applications, I've got a pretty good db-driven user permission system going, but am having trouble coming up with a good way to handle content groups and pages, I've got a couple options and not sure which one to take. Furthermore, I am not sure how to handle static page updates that have no 'widgets' in them. My current set-up for permissions is this: Objects: User, UserGroup, UserUserGroup, UserGroupType Standard many to many relationship User -> UserUserGroup <- UserGroup each Usergroup has a UserGroupType, which could be anything from Title, Department, to PermissionGroup. PermissionGroup manages the permissions. Right now on a per page basis I check permissions based on their PermissionsGroups. So for a page which has CMS features for a news widget, I check for permission groups of "Site Admin" and "News Admin". Now the issue I am coming to is, the site has many different departments involved. No problem I think, I can just have a EntityContentGroup so any widget app can be used for any departments. So my HR department, each of their news items would be in the EntityContentGroup with the news item ID, and content group of "HR" or "HR News". But maybe this isn't the most efficient way to go about it? I don't want to put the content group simply as a NewsItemType because some news items could apply to multiple areas, so I want to be able to assign them to as many areas as I want. Likewise, all of my widget apps have this, so that's why I decided to choose EntityContentGroup and not just NewsItemContentGroup. I was also thinking well instead of doing a contentGroup do a Page object that says which page some entity should be on. It seems almost like the same thing, but would I want to use Page for something else? I was thinking Page would be used for static pages with no widgets, a simple Rich Text Editor can edit the content of that page and I save that item to a page?? And then instead of doing a page level check for UserGroup permissions, would it be better to associate a usergroup to a contentgroup, and then just depending on what contentGroup content on the page is displayed, determine the permissions through that relationship? Is that better? I am not sure at this point. I guess I am just getting a tad overwhelmed at this is the largest app in scope and size that I have ever written. What is the best approach for this based on my current user permission set-up?

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  • why using gridview, detailsview, formview, repeater, datalist?

    - by sam
    Hi guys, I am in commercial development for few months only, the team leader is not using gridview, detailsview, formview, repeater, datalist. we alwyas write our own looping to dislpay the data even it is read only. He said : we do this for better performance. and I am always thinking, so why microsoft create them??? I checked other questions and articles, and I am still confused. please try to give me a persuadable answer. thanks

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  • Looking for: C/C++ Regex library that supports Named Captures

    - by user318811
    I'm thinking about writing a small application that will help me mass rename files. I currently use an application named 'RegexRenamer', which (I'm assuming) uses the .NET regex engine. The application is fine, but is sort of clunky. So what I'm looking for is a C/C++ regex library that I can build my custom program off of. Anything that is small and lightweight is preferred (.Net seems heavy). Thanks.

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  • Is assert evil?

    - by dehmann
    The Go language creators write: Go doesn't provide assertions. (...) Programmers use them as a crutch to avoid thinking about proper error handling and reporting. What is your opinion about this?

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  • How can I fall in love with Math? Again?

    - by gotts
    After reading How to not sort by average rating by Evan Miller I was really inspired to learn some more math. But after thinking about it for a while I didn't find a way I can use beyond-trivial math in my pet projects.. Or probably it is a moment like "You are not aware that you are not aware" and I should learn more math before I can start to see great examples of how I can apply it?

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  • Switch statements: do you need the last break? (Javascript mainly)

    - by Jon Raasch
    When using a switch() statement, you add break; in between separate case: declarations. But what about the last one? Normally I just leave it off, but I'm wondering if this has some performance implication I'm not thinking about? I've been wondering about this for a while and don't see it asked elsewhere on Stack-O, but sorry if I missed it. I'm mainly asking this question regarding Javascript, although I'm guessing the answer will apply to all switch() statements.

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  • Questions about .NET CollectionEditor

    - by smwikipedia
    Who can tell me the internal working mechanism of a CollectionEditor in plain English? I have implemented every virtual function and step into each of them. Still got no clue of its intended algorithm. I searched the web and found tons of compaints about the CollectionEditor type, and even bugs. I am kind of thinking of the CollectionEditor as a total mess.

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  • Fastest way to check array items existence in mySQL table

    - by Enrique
    User writes a series of tags (, separated) and posts the form. I build an array containing the tags and delete dupes with array_unique() php function. I'm thinking of doing: go through the array with foreach($newarray as $item) { ... } check each $item for existence in the tags mySQL table if item does not exists, insert into tags table Is there a FASTER or MORE OPTIMUM way for doing this?

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  • js detect https

    - by ntan
    Hi, i am trying to find how can i "detect" width JavaScript if i am ih http or https environment I am calling ajax request so if i am in https and call http ajax i get 302 Moved Temporarily I was thinking of get the current window.location.href and do a strinh manipulation Any suggestion is welcome.

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