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• Maximum number of files in one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• how to open Gmail View Message Activity?

  - by NickLai

  I want to write an application to List the Gmail message. In the list, if user click one of the message item, it shall link ot Gmail App to see more detial information. Currently I can read the Gmail db with Gmail.java. There are some problems while I want to open Gmail Activity. In general, we can open Activity with Action and parameters. But Gmail App has not release code base. We do not know what Action set to Gmail Activity and what parmeter shall we put the extras. I only know that the Activity of View detial Message is named "HtmlConversationActivity." And the Package is under "com.google.android.gm." please tell me how to open the View detial Message Activity in Gmail APP. thanks a lot.

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• .NET platform independant sync framework

  - by Quandary

  Question: I need to synchronize a few ActionScript files from my computer to a network share (backup). I saw a quick fix would be using Microsoft Sync Framework for this, and write a windows service. My problem is I also use Linux, and before I start with MS vendor lockin, is there any sync framework/library/whatever I could use that works accross platform? Or does the MS sync framework work on Linux, too? It is my understanding that it is a wrapper around some com objects, thus it wouldn't work. All I need is synchronizing files. So never mind the database part, although it would be nice to have it, too.

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• VHDL Simulation Timing Behaviour

  - by chris

  I'm trying to write some VHDL code that simply feeds sequential bits from a std_logic_vector into a model of an FSM. However, the bits don't seem to be updating correctly. To try figure out the issue, I have the following code, where instead of getting a bit out of a vector, I'm just toggling the signal x (the same place I'd be getting a bit out). clk <= NOT clk after 10 ns; process(clk) begin if count = 8 then assert false report "Simulation ended" severity failure; elsif (clk = '1') then x <= test1(count); count <= count + 1; end if; end process; EDIT: It appears I was confused.I've put it back to trying to take bit by bit out of the vector. This is the output. I would have thought that on when count is 1, x would take on the value of test1(1) which is a 1.

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• ASP.NET: What's the best way to validate 3 drop downs boxes that are used to select a date (month, d

  - by Josh

  I have two sets of drop downs for start date and end date. Each date is created by selecting a month, day, and year from 3 separate drop downs. I currently have RequiredFieldValidators on all the drop downs (which just shows a * if nothing has been selected yet), but I need to validate that the end date is greater than the start date. I can take care of the logic behind comparing the dates, but in terms of the validation method used, can someone help me out (I essentially need to validate 6 drop downs all at one time)? I tried a custom validation using client side javascript but couldn't get it to work. Can you even validate multiple drop downs using ASP.NET validation controls? (which is what I would like to do - I can always write the javascript, but was trying to stay away from this). Thanks.

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• SQL Server Mapping a user to a login and adding roles programmatically

  - by user163457

  In my SQL Server 2005 server I create databases and logins using Management Studio. My application requires that I give a newly created user read and write permissions to another database. To do this I right-click the newly created login, select properties and go to User Mapping. I put a check beside the database to map this login to the db and select db_datareader and db_datawriter as the roles to map. Can this be done programmatically? I've read about using Alter User and sp_change_users_login but I'm having problems getting these to work, since sp_change_users_login has been deprecated so I'd prefer to use Alter User. Please note my understanding of SQL Server database users/logins/roles is basic

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• SimpleDB direct client access

  - by AlexJReid

  One of the useful things about S3 for content storage is that a client can directly make a direct HTTP request to download the object. For instance, this is how Twitter serve up avatar images. SimpleDB provides an HTTP interface to data. Rather than having to write a proxy that sits inbetween SimpleDB and the client, is it possible for client software (i.e. desktop, mobile) to make calls to read values from a SimpleDB domain, without sharing credentials that shouldn't be shared? Or is a proxy in-between the only way to go?

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• which MVC for coldfusion?

  - by mrjayviper

  newbie to MVC here. so please be gentle. I want to move one of our existing apps (currently located in http://www.companywebsitegoeshere.com/myapp1) to MVC. As can be seen in the URL, there are many apps running in the website which I intend to move at some stage. I don't have write access to the wwwroot (/var/www/html in my case) and the webserver is used by multiple developers across the company. I'm hoping I can have the MVC framework core files/folders + my app all located in in 1 subfolder. In the case of myapp1, all the filers and folders will be inside /var/www/html/myapp1 subfolder. Can you please point me to the right direction (links/guides/docs/videos/etc)? I've looked at several like cfwheels/mach-ii/fw1 but they seemed requires wwwroot access. Thanks! :)

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• Reverse engineering a custom data file

  - by kerchingo

  At my place of work we have a legacy document management system that for various reasons is now unsupported by the developers. I have been asked to look into extracting the documents contained in this system to eventually be imported into a new 3rd party system. From tracing and process monitoring I have determined that the document images (mainly tiff files) are stored in a number of 1.5GB files. These files seem to be read from a specific offset and then written to a tmp file that is then served via a web app to the client, and then deleted. I guess I am looking for suggestions as to how I can inspect these large files that contain the tiff images, and eventually extract and write them to individual files.

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• Perl modules for controlling browsers

  - by AmbroseChapel

  I need to write a perl script to scrape a website. The website can only be scraped with JavaScript, and the user is on Windows. I got some way with Win32::IE::Mechanize on my work machine, which has IE6, but then I moved to my netbook which has IE8, and can't even get as far as fetching a simple page. Is Win32::IE::Mechanize up to date with the latest versions of IE? But, tl,dr -- more to the point, given a recent WinXP machine, what's the quickest, easiest way to scrape a site which only reveals its content via JavaScript?

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• recv receiving not whole data sometime

  - by milo

  hi all, i have following issue: here is the chunk of code: void get_all_buf(int sock, std::string & inStr) { int n = 1; char c; char temp[1024*1024]; bzero(temp, sizeof(temp)); n = recv(sock, temp, sizeof(temp), 0); inStr = temp; }; but sometimes recv returning not whole data (data length always less then sizeof(temp)), only it's part. write side always sends me whole data (i got it with sniffer). what matter? thx. P.S. i know, good manner suggests me to check n (if (n < 0) perror ("error while receiving data), but it doesn't matter now - it's not reason of my problem. P.S.2 i've forgot - it's blocking socket.

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• copying the contents of a binary file

  - by Ganesh

  I am designing an image decoder and as a first step I tried to just copy the using c. i.e open the file, and write its contents to a new file. Below is the code that I used. while((c=getc(fp))!=EOF) fprintf(fp1,"%c",c); where fp is the source file and fp1 is the destination file. The program executes without any error, but the image file(".bmp") is not properly copied. I have observed that the size of the copied file is less and only 20% of the image is visible, all else is black. When I tried with simple text files, the copy was complete. Do you know what the problem is?

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• In Python, are there builtin functions for elementwise map of boolean operators over tuples of lists

  - by bshanks

  For example, if you have n lists of bools of the same length, then elementwise boolean AND should return another list of that length that has True in those positions where all the input lists have True, and False everywhere else. It's pretty easy to write, i just would prefer to use a builtin if one exists (for the sake of standardization/readability). Here's an implementation of elementwise AND: def eAnd(*args): return [all(tuple) for tuple in zip(*args)] example usage: >>> eAnd([True, False, True, False, True], [True, True, False, False, True], [True, True, False, False, True]) [True, False, False, False, True] thx

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• Best Ruby ORM for Wrapping around Legacy MSSQL Database?

  - by Technocrat

  Hi. I found this answer and it sounds like almost exactly what I'm doing. I have heard mixed answers about whether or not datamapper can support mssql through dataobjects. Basically, we have an app that uses a consistently structured database, consistently named tables, etc in MSSQL. We're making all kinds of tools and stuff that have to interact with it, some of them remotely and so I decided that we need to create some common, simple access point to do read/write operations on the MSSQL app since it's API is all C# and other things I despise. Now my question is if anyone has any examples or projects they know of where a ruby ORM can essentially create models for another application's legacy database by defining the conventions of each model's pkeys, fkeys, table names, etc. Sequel is the only ORM I've used with MSSQL but never to do anything quite like this. Any suggestions?

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• Are there any good books on writing commercial quality software?

  - by Andy

  Hey, My background has been generally new technology demonstrators, which, well... demonstrate the latest technology and how it can be of use to a clients company. They use it for internal demos etc. Now my career has shiffed course a bit more into actual products, in particular software which runs in locations like museums as interactive pieces. Clearly, although the technology demonstrators had to be well coded etc, there wasn't as much emphasis as there is on my current work, which has to work, be highly configurable, probably multi-ligual and run constantly, without restarts. So my question is, now that I'm trying to up my coding quality and write more commercial applications, are there any books which discuss issues surrounding high quality commercial software? I currently have a copy of Code Complete 2nd Edition, which is excellent, but just wondering if there's any better, possibly more focused titles out there? Thanks a lot! Andy.

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• Does preloading content from a page skew my google analytics stats?

  - by user278457

  I'd like to write myself a simple script that uses AJAX to load the content from each page on my main navbar into a hidden div on the current page. This is just so that I can preload as much of my important content as possible and get it cached on the user's computer (hopefully) before they've finished with the current page and want to move on. I'm concerned that doing a request for every page on the site, every time someone visits, will really ruin the validity of my google analytics stats. How does AJAX interact with google analytics? Does it count as a "page visit"?

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• Simple modal div in jQuery?

  - by jasondavis

  I have tried almost all of the jQuery Modal plkugins I can find on the net but they are all much to bulky for what I need. I dont need all the fancy features, I want to be able to open a div and have the background of the page go transparent grey like the photo below and have my div be on top of it, that is all I need to do so I would like to write some jquery to do this instead of using a bulky plugin. Does anyone have any small code that can do this task? Is the transparent background an image or just css?

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• Security Exception while implementing global search for Messaging

  - by Sunil

  I am trying to enable global search for messaging application (i.e., messages can be searched from home screen search box). I have followed all the steps given in http://developer.android.com/reference/android/app/SearchManager.html I am getting the following exception 04-16 12:49:26.917: ERROR/DatabaseUtils(102): java.lang.SecurityException: Permission Denial: reading com.android.providers.telephony.MmsSmsProvider uri content://mms-sms/search_suggest_query/m?limit=58 from pid=106, uid=10000 requires android.permission.READ_SMS I have set permission in MmsSmsProvider.java file for read, write sms and global search, but still I get this error. Can anyone help. Regards, Sunil.

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• Is there a way to serialize automatically enums as int?

  - by FireAphis

  Hello, Is there a way to serialize enums automatically as int? Every time I define a new enum and write std::stringstream stream; stream << myenum1; stream >> myenum2; the compiler complains that the operators << and are not defined. Do you know a way to tell the compiler to treat enums as plain int's? What makes the problem harder is that, actually, the serialization is inside a template. Something like this: template <typename T> void serialize(const T& value) { std::stringstream stream; stream << value; } So I cannot add any casts :( Maybe I can specialize it somehow? Thank you.

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• C++ vector of char array

  - by Stuart

  I am trying to write a program that has a vector of char arrays and am have some problems. char test [] = { 'a', 'b', 'c', 'd', 'e' }; vector<char[]> v; v.push_back(test); Sorry this has to be a char array because I need to be able to generate lists of chars as I am trying to get an output something like. a a a b a c a d a e b a b c Can anyone point me in the right direction? Thanks

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• Basic Python While loop compound conditional evaluation

  - by dbjohn

  In Python IDLE Shell it seems I cannot use a compound conditional expression and a while loop. I tried it within brackets too. k=0 m=0 while k<10 & m<10: print k k +=1 m+=1 If I write while k<10: print k k+=1 This does work. Is there a way I could achieve the first block of code with the "and" operator. I have done it in Java. Do I just need to put together "if" statements to achieve the same functionality in Python?

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• Does Ruby/Rails require more unit testing than say a PHP app?

  - by Blankman

  I don't find the unit testing push in the PHP market like I see/read in the ruby/rails arena. Could one just as easily NOT unit test in ruby/rails as in php, or is ruby just too bendable and breakable that it "more" recommended to test in ruby than in php? Meaning there are large code bases like vBulletin, and from what I can tell, they don't unit test. I hope you understand what I am asking here, not the pros/cons of testing, or whether one should test or not, but rather, does one language need to be tested more than another? maybe its easy to write buggy code, or break during refactoring etc.

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• iPhone UIImage Display Controller

  - by Bill Shiff

  Hello, I would like to be able to display a UIImage from within my app and support a lot of the functionality available in the built-in Photos app (i.e., pinch-to-zoom, pan, etc). I don't really want to write a bunch of code that someone has already written, so I'm wondering if there is a library out there already that I could just import into my project. I'm aware of the Three20 project, but I don't want to import a huge library if I don't have to. Is anyone aware of an available library that's already out there for displaying UIImages? Or part of some open-source project that can be pulled out on its own? Thanks!

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• Best Practice for Exporting an App's Data to XML via PHP/MySQL?

  - by Alex Cook

  I have an a business app and I want to give my users the ability to export their data at anytime. I'm aware that I can write an XML file semi-manually by doing something like this: http://www.kirupa.com/web/mysql_xml_php.htm But, I thought I'd ask if this is the best practice? Or is there some framework I can use to do this more easily/quickly? Maybe there isn't - it won't be too hard to do it the above way. Also, less importantly - XML is the best format to export to, right? Thanks in advance.

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• saving dataset in excel and allow user to download it in the client machine.

  - by Jebli

  Hi, I am developing an application where i want i am displaying a dataset in the datagrid view for the user.Now the user wants to download the data in the datagridview in an excel format.How can i do it ? 1) should i write the dataset in the excel and save it the server before the user download the file ? 2) Can i use a hyper link and set the path of the file that is saved in the server to the hyper link hRef property , so that the user can click and download the file ? I am using C# ASP.net 2.0 Please help !

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