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• Large file download for a Rails project

  - by Horace Ho

  One client project will be online two months later. One of the requirements changed is to support large files (10 to 15MB per RAW camera file, expected 1000 to 5000 files download per day) download worldwide for their customers. The process will be: there is upload screen via paperclip to the rails local public folder a hourly task to upload to web storage (S3?) update the download url from paperclip url to the web url Questions: is there a gem/plug-in for this purpose? if no, any gem/plug-in for S3 to recommend? Questions about the storage provider: is S3 recommended? or other service to recommend? The baseline is: the client's web server does not and will not have the bandwidth to handle the downloads. Thanks

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• Getting a table's values into a tree

  - by Jason

  So, I have a table like such: id|root|kw1|kw2|kw3|kw4|kw5|name 1| A| B| C| D| E| F|fileA 2| A| B| | | | |fileB 3| B| C| D| E| | |fileC 4| A| B| | | | |fileD (several hundred rows...) And I need to get it into a tree like the following: *A *B -fileB -fileD *C *D *E *F -fileA *B *C *D *E -fileC I'm pretty sure the table is laid out poorly but it's what I have to live with. I've read a little about Adjacency List Model & Modified Preorder Tree Traversal but I don't think my data is laid out correctly. I think this requires a recursive function, but I'm not at all sure how to go about that. I'm open to any ideas of how to get this done even if it means extracting the data into a new table just to process this. Are there any good options available to me or any good ways to do this? (Examples are a bonus of course)

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• Using GetLineStartPosition to get the end of a line in WPF RichTextBox.

  - by Alan Spark

  A bit of background. I would like to be able to process text for the line that the caret is on in a WPF RichTextBox. Please see my earlier question about the TextPointer class: http://stackoverflow.com/questions/3046162/how-to-keep-track-of-textpointer-in-wpf-richtextbox. I know how to get the TextPointer at the start of the current line by using GetLineStartPosition with 0 as the argument but would now like to get the TextPointer at the end of the line. It was suggested in my previous question that this is possible using the GetLineStartPosition method. I would appreciate it if someone can explain a bit about how the GetLineStartPosition works with regard to end of line pointers. Thanks in advance for any help.

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• How can I compile an autotools project with statically linked dependancies?

  - by flyx

  There's an open source library I want to use. As I want to spread my software as binary package, I do not want the library to have dependancies on other libraries, so I need to link the dependancies statically. Now as the library is open source and there are no binaries provided, I compile it myself. The library uses autotools, and I didn't find any useful documentation on how to link dependancies statically. What I did try is to call the configure script with --enable-static, but this apparently only tells configure to compile a static version of the library - but what I need is a dynamic library that includes all the libraries it depends on. So, I need a way to either tell configure to link against dependancies statically, or a way to post-process the built library to include all dependancies. Can anyone tell me how to do this? Oh, and if it matters: I'm on 64bit Snow Leopard.

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• what's the key different between data management and data governance?

  - by Sid Xing

  i just read some articles about these two theories, and i thought they have the similar goal, but DG is more about process management by follow some best practice. So my 1st question is about the difference between DG & DM. I'm confused. There're so many concepts around data management. Data quality, data security, data governance, data profiling, data integration, master data management, metadata management.... It seems like neither of them is EXACTLY separated, they're together. My 2nd question, or ask for your suggestion to help me better understand the relation between these concepts. Appreciate your help.

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• LINQ to SQl updating primary key field?

  - by Curtis White

  I have a linq to sql table/class that uses a GUID as both a primary key and as foreign key. This problem came up when factoring some code that previously worked. The exception generated is "Operation is not valid due to the current state of the object." The process I use is as such: aspnet_User user() = new aspnet_User(); aspnet_user.childTable = new childTable(); .. set some properties user.Insert() -> my custom method ... @ my custom method using (mycontext dc = new context() ) { user.childTable.ID = (Guid)myNewlyCreatedGuid; } The exception occurs on the assignment childTable.set_UserId().

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• How to initialise a STL vector/list with a class without invoking the copy constructor

  - by Warpspace

  I have a C++ program that uses a std::list containing instances of a class. If I call e.g. myList.push_back(MyClass(variable)); it goes through the process of creating a temporary variable, and then immediately copies it to the vector, and afterwards deletes the temporary variable. This is not nearly as efficient as I want, and sucks when you need a deep copy. I would love to have the constructor of my class new something and not have to implement a copy constructor just to allocate my memory for the second time and waste runtime. I'd also rather not have to immediately find the class instance from the vector/list and then manually allocate the memory (or do something horrible like allocate the memory in the copy constructor itself). Is there any way around this (I'm not using Visual Studio BTW)?

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• do.call(rbind, list) for uneven number of column

  - by h.l.m

  I have a list, with each element being a character vector, of differing lengths I would like to bind the data as rows, so that the column names 'line up' and if there is extra data then create column and if there is missing data then create NAs Below is a mock example of the data I am working with x <- list() x[[1]] <- letters[seq(2,20,by=2)] names(x[[1]]) <- LETTERS[c(1:length(x[[1]]))] x[[2]] <- letters[seq(3,20, by=3)] names(x[[2]]) <- LETTERS[seq(3,20, by=3)] x[[3]] <- letters[seq(4,20, by=4)] names(x[[3]]) <- LETTERS[seq(4,20, by=4)] The below line would normally be what I would do if I was sure that the format for each element was the same... do.call(rbind,x) I was hoping that someone had come up with a nice little solution that matches up the column names and fills in blanks with NAs whilst adding new columns if in the binding process new columns are found...

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• Returning messages in Smalltalk

  - by Zachary

  I have a Dictionary of objects I have created in smalltalk, which I am iterating over by enumerating it based on the key/value pairs. For value object in the dictionary, I am calling a method on that object. Based on certain conditions, I would like for this object to be able to add a new member to dictionary, and possibly delete another one. I've been looking at the 'Perform' and 'Messages' facilities in Smalltalk, but I'm not sure if it is even possible to do what I'm trying to do - is it possible to return a message (or multiple messages), which another object can process and perform? For example, could my method return 'removeKey: 19' and 'add object' at the same time? I am using GNU Smalltalk, if it matters.

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• How would you create a string of all UTF-8 characters? [PHP]

  - by Xeoncross

  There are many ways to represent the +1 million UTF-8 characters. Take the latin capital "A" with macron (A). This is unicode code point U+0100, hex number 0xc4 0x80, decimal number 196 128, and binary 11000100 10000000. I would like to create a collection of the first 65,535 UTF-8 characters for use in testing applications. These are all unicode characters up to code point U+FFFF (byte3). Is it possible to do something like a for($x=0) loop and then convert the resulting decimal to another base (like hex) which would allow the creation of the matching unicode character? I can create the value A using something like this: $char = "\xc4\x80"; // or $char = chr(196).chr(128); However, I am not sure how to turn this into an automated process. // fail! $char = "\x". dechex($a). "\x". dexhex($$b);

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• Serving large generated files using Google App Engine?

  - by John Carter

  Hiya, Presently I have a GAE app that does some offline processing (backs up a user's data), and generates a file that's somewhere in the neighbourhood of 10 - 100 MB. I'm not sure of the best way to serve this file to the user. The two options I'm considering are: Adding some code to the offline processing code that 'spoofs' it as a form upload to the blob store, and going thru the normal blobstore process to serve the file. Having the offline processing code store the file somewhere off of GAE, and serving it from there. Is there a much better approach I'm overlooking? I'm guessing this is functionality that isn't well suited to GAE. I had thought of storing in the datastore as db.Text or Dd.Blob but there I encounter the 1 MB limit. Any input would be appreciated,

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• I'm asked to tune a long starting app into a short time period

  - by Jason

  Hi, I'm asked to shorten the startup period of a long starting app, however I have also to obligate to my managers to the amount of time i will reduce the startup - something like 10-20 seconds. As i'm new in my company I said I can obligate with timeframe of months (its a big server and I'm new and i plan to do lazy load + performance tuning). that answer was not accepted I was required to do some kind of a cache to hold important data in another server and then when my server starts up it would reach all its data from that cache - I find it a kind of a workaround and i don't really like it. do you like it? what do you think I should do? any suggestions? PS when i profiled the app i saw many small issues that make the startup long (like 2 minutes) it would not be a short process to fix all and to make lazy load. Any kind of suggestions would help. language - java. Thanks

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• Standardizing camera input in OpenCV? (Contrast/Saturation/Brightness etc..)

  - by karpathy

  I am building an application using OpenCV that uses the webcam and runs some vision algorithms. I would like to make this application available on the internet after I am done, but I am concerned about the vast differences in camera settings on every computer, and I am worried that the algorithm may break if the settings are too different from mine. Is there any way, after capturing the frame, to post process it and make sure that the contrast is X, brightness is Y, and saturation is Z? I think the Camera settings themselves can not be changed from code directly using the current OpenCV Python bindings. Would anyone be able to tell me about how I could calculate some of these parameters from the image and adjust them appropriately using OpenCV?

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• hadoop mapper static initialisation

  - by rakeshr

  Hi, I have a code fragment in which I am using a static code block to initialize a variable. public static class JoinMap extends Mapper<IntWritable, MbrWritable, LongWritable, IntWritable> { ....... public static RTree rt = null; static { String rtreeFileName = "R.rtree"; rt = new RTree(rtreeFileName); } public void map(IntWritable key, MbrWritable mbr,Context context) throws IOException, InterruptedException { ......... List elements = rt.overlaps(mbr.getRect()); ....... } } My problem is that the variable rt in the above code fragment is not getting initialised. Can anybody suggest a fix or an alternate way to initialise the variable. I don't want to initialise it inside my map function since that slows down the entire process.

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• Run batch file when argument contains quotes and spaces (from .NET framework)

  - by turtle

  I have a bat file which sets some environment variables, and then executes a command on the command line. I want to replace the hard coded command with one passed in via a parameter. So: :: Set up the required environment SET some_var=a SET another_var=b CALL some.bat :: Now call the command passed into this batch file %1 The problem is that the command is complex, and doesn't escape cleanly. It looks like this: an.exe -p="path with spaces" -t="some text" -f="another path with spaces" I'm trying to call the .bat from a .NET framework app, using: Dim cmd as String = "the cmd" System.Diagnostics.Process.Start( thebat.exe, cmd ) but I can't seem to get the escapes to work correctly. Can someone tell me how the string cmd should be entetered to get the command passed into the bat file as an argument correctly?

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• 64 bit COM(ActiveX) server

  - by Velja Radenkovic

  Hello, I have activex server exe that was building and registering fine on 32bit OS. I wanted to make 64 bit version of that exe by upgrading project to Visual Studio 2010 and changing platform to X64 which apparently doesn't work. Application itself works but I don't see it registered after running That.exe /RegServer I would appreciate any usable advice on migrating activex from 32 to x64. Code that is processing /RegServer param is below: if(lstrcmpi(lpszToken, _T("RegServer")) == 0) { _Module.UpdateRegistryFromResource(IDR_OUTDISKSARG, TRUE); nRet = _Module.RegisterServer(TRUE); bRun = false; break; } 32 bit activex is unuable for me since I have to load it in x64 .NET process.

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• Waiting for a background operation to complete

  - by JohnHenry

  I have been suffering from the all too common 'Waiting for a background operation to complete...' message in Visual Studio 2012 (Professional) for a while now but it has been fairly sporadic. Lately though, I am really struggling to use Visual Studio as pretty much whenever i try and do anything with any Razor views (mostly clicking to move the cursor) visual studio hangs and the above message appears for about a minute at a time. (If when its finished doing stuff i then click in the view again, the process repeats, and repeats, and repeats.....) I have searched high and low, and read loads of articles regarding this and peoples suggestions and tried changing indentation settings, resetting settings, etc but none have worked. Has anyone come across something else that may work as this is seriously impeding my ability to use visual studio and sadly provoking much cursing.

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• Catch unhandled exception of invisible thread

  - by user346804

  In my C++ application i use an activeX component that runs its own thread (or several I don't know). Sometimes this components throws exceptions. I would like to catch these exceptions and do recovery instead of my entire application crashing. But since I don't have access to its source code or thread I am unsure how it would be done. The only solution I can think of is to run it in its own process. Using something like CreateProcess and then CreateRemoteThread, unsure how it could be implemented. Any suggestion on how to go about solving this?

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• n00b: receive input over TCP/IP and use it to update HTML

  - by mawg

  This has got to be a FAQ, so can someone please just direct me to a "network programming for dummies" URL? The server wants to push information to a client or broadcast to all, when an event happens - as opposed to the clients constantly polling the server "just in case". The client then updates a browser page display. How do I do that? (toldya it was a n00b question) Should I have a thread which receives info on a socket and then writes it to a database which the browser display (PHP) can process with an HTML refresh tag, or what? Sorry to sound so dumb.

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• regex: trim all strings directly preceeded by digit except if string belongs to predefined set of st

  - by Geert-Jan

  I've got addresses I need to clean up for matching purposes. Part of the process is trimming unwanted suffices from housenumbers, e.g: mainstreet 4a --> mainstreet 4. However I don't want: 618 5th Ave SW --> 618 5 Ave SW in other words there are some strings (for now: st, nd, rd, th) which I don't want to strip. What would be the best method of doing this (regex or otherwise) ? a wokring regex without the exceptions would be: a = a.replaceAll("(^| )([0-9]+)[a-z]+($| )","$1$2$3"); //replace 1a --> 1 I thought about first searching and substiting the special cases with special characters while keeping the references in a map, then do the above regex, and then doing the reverse substitute using the reference map, but I'm looking for a simpler solution. Thanks

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• Handling Messages in Console Apps/DLLs in C++ Win32

  - by vsimon

  I would like to have the ability to process Win32 messages in a console app and/or inside a standalone DLL. I have been able to do it in .NET with the following article and it works great in C# inside a console app and standalone DLL http://msdn.microsoft.com/en-us/magazine/cc163417.aspx Is there a way to do the equivalent with C/C++ Win32 APIs? I have tried doing RegisterClassEx(...) and CreateWindow(...) even passing in HWND_MESSAGE to hWndParent but the trouble is that after the "invisible" window is created messages are not being processed probably due to the lack of a message pump. Where would the message pump go if you had a DLL entry point? I have tried creating another thread in a DLL and put while(GetMesage(..)) there but that did not work either. Any ideas?

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• Proper error handling in a custom Zend_Autoloader?

  - by Pekka

  I'm building a custom autoloader based on Zend Framework's autoloading (related question here). The basic approach, taken from that question, is class My_Autoloader implements Zend_Loader_Autoloader_Interface { public function autoload($class) { // add your logic to find the required classes in here } } and then binding the new autoloader class to a class prefix. Now what I'm unsure about is how to handle errors inside the autoload method (for example, "class file not found") in a proper, ZF compliant way. I'm new to the framework, its conventions and style. Do I quietly return false and let the class creation process crash? Do I output an error or log message somehow (which would be nice to pinpoint the problem) and return false? If so, what is the Zend way of doing that? Do I trigger an error? Do I throw an exception? If so, what kind?

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• Branch structure for a web site

  - by steve_d

  I was recently reading the TFS Branching Guide and it suggests a branch for every release. For a web site, there is only one "version" released at a time. In that case is it appropriate to have a single "Production" branch? Then, during the process of preparing for a release, you merge changes from the Main branch into Production. (As opposed to the suggestion to branch each release.) If you need to do a hotfix, do it in the Production branch, then reverse integrate into Main. Doing it this way allows you to keep configuration files for Production intact in the Production branch.

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• how to keep the value of a variable in a closure

  - by Florian Fida

  i need to create multiple javascript functions which have a static id inside, so the function itself knows what data to process. Here is some code: (function(){ function log(s){ if(console && console.log) console.log(s); else alert(s); } var i = 10; while (i--){ window.setTimeout(function(){ // i need i to be 10, 9, 8... here not -1 log(i); },500); } })(); The problem ist that i allways gets updated by the loop, and i need to prevent this. Thanks in advance for any help, comments or tips!

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• Unable to install mono properly on windows 7 64bit

  - by capeceneveral

  Hi I am a newbie on mono. I need to develop a software with it as a Grad Project. But I am having a problem on installing mono.I will go step by step : I dowloaded “mono-3.2.3-gtksharp-2.12.11-win32-0” from mono-project.com.And ran the installation process. -But I faced a problem on testing on mono command prompt. I tried to follow the instructions on the page (http://mono-project.com/Mono:Windows)but could not create simple c# file. Any help or comment will be appreciated.

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