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• Reading from a file not line-by-line

  - by MadH

  Assigning a QTextStream to a QFile and reading it line-by-line is easy and works fine, but I wonder if the performance can be inreased by first storing the file in memory and then processing it line-by-line. Using FileMon from sysinternals, I've encountered that the file is read in chunks of 16KB and since the files I've to process are not that big (~2MB, but many!), loading them into memory would be a nice thing to try. Any ideas how can I do so? QFile is inhereted from QIODevice, which allows me to ReadAll() it into QByteArray, but how to proceed then and divide it into lines?

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• Coredump in Multithreading Application in RHEL-5(Help Required)

  - by Chinnu

  I am working on multi-threading application it is dumping frequently.I could not able to analyaze the core.The core is showing like this Core was generated by `thread-process '. Program terminated with signal 6, Aborted. 0 0x00000038f4e30045 in raise () from /lib64/libc.so.6 (gdb) where 0 0x00000038f4e30045 in raise () from /lib64/libc.so.6 1 0x00000038f4e31ae0 in abort () from /lib64/libc.so.6 2 0x00000038f4e681bb in __libc_message () from /lib64/libc.so.6 3 0x00000038f4e72b96 in free () from /lib64/libc.so.6 4 0x000000000046a137 in std::string::substr () 5 0x000000000042c549 in std::operator<< , std::allocator () 6 0x000000000042cc1d in std::operator<< , std::allocator () 7 0x000000000046b069 in std::string::substr () 8 0x000000000046c866 in std::string::substr () 9 0x0000000000431062 in std::operator<< , std::allocator () 10 0x00000038f5a062e7 in start_thread () from /lib64/libpthread.so.0 11 0x00000038f4ece3bd in clone () from /lib64/libc.so.6

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• Can not access android /data folder?

  - by fonter

  try { Runtime rt = Runtime.getRuntime(); Process pcs = rt.exec("ls -l /data"); BufferedReader br = new BufferedReader(new InputStreamReader(pcs .getInputStream())); String line = null; while ((line = br.readLine()) != null) { Log.e("line","line="+line); } br.close(); pcs.waitFor(); int ret = pcs.exitValue(); Log.e("ret","ret="+ret); } catch (Exception e) { Log.e("Exception", "Exception", e); } only print "ret=0",How to print the correct path?

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• Integrate code generation with eclipse c++ build

  - by Dan

  Hi, I am using Eclipse for C++ development on windows. I have also written a code generator that take an xml file and produces several C++ files. The project I am working on is currently setup to use the internal builder. What I would like to do is to run the code generator as part of the build process. My problem is that I haven't been able to find a way to make Eclipse identify that the files are present (or have been updated) without 'Refeshing' the project. So although I can run the code generator as a pre-build step, the files generated aren't guaranteed to be included in the build. Does anybody know whether there is a way to make Eclipse do a refresh after the pre-build step or something to that effect, using the internal builder? Thanks

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• What is a Web Framework ? How does it compare with LAMP

  - by Nishant

  I started web development in LAMP/WAMP and it was logical to me . There is a Web Server program called Apache which does the networking part of setting up a service on port 80 ( common port ) . If the request is regular HTML it uses the HTTP headers to transport files .And if the request for the file is a PHP one , it has a mod_php with which Apache invokes the PHP interpreter to process the file and it gives back HTML which is again transferred as usual HTML . Now the question is what is a Web Framework ? I came across Python based website creation and there is Flask . What is a flask , how does it compare with LAMP . Further are DJango / Ruby on Rails different from flask ? Can someone answer me and also give some good places to read on these .Thanks for your answers in advance . Further is things like LAMP slower than the common FRAMEWORKS because they claimn easy deplyment fo web apps .

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• Lock Question - When is an Update (U) lock issued?

  - by Randy Minder

  We are trying to resolve a deadlock problem. The transaction that is getting rolled back is attempting to issue an Update (U) lock on a resource that another transaction has an Exclusive (X) lock on. According to Books Online (http://msdn.microsoft.com/en-us/library/ms175519.aspx), an Update lock is supposed to prevent deadlocks, not cause them. So, my question is, why/when is an Update lock applied to a resource? We're a little confused about this because the resource that is attempting to have the Update lock applied to will not be updated by the process that is having the transaction rolled back. Thanks for your help on this. Randy

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• XMLHttpRequest cross site scripting on same server but differnt port

  - by clamp

  hello, using XMLHttpRequest it is not possible to open a connection to a document on a different domain than where the page itself is hosted. but what about different ports? for example i have a webserver running on my machine listening on port 80 so the webaddress would look like this: http://localhost:80/mypage.html and i have another webserver running on localhost which is meant to process the ajax requests but listens on a different port. so the javascript in mypage.html would look like this: var xmlhttprequest = new XMLHttpRequest(); xmlhttp.open("GET", "http://localhost:1234/?parameters", true); xmlhttp.send(); would this work? or will it give a security exception as well?

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• Linux standard input issue

  - by George2

  Hello everyone, I am new to Linux. And I am using Red Hat Enterprise Version 5. There is a ruby program which use standard input as its input (e.g. the Ruby program process input from standard input). I think standard input should be keyboard, correct? So, I think other kinds of input (non-standard input) should not work (i.e. the ruby program should not be able to read input from such non-standard input), but actually I have tried using pipe works, I am so confused because I think pipe should be some other kinds of input -- other than standard input, why it could work? i.e. put text "123" in abc.txt with pipe, could achieve the same result as using keyboard as input to type "123" for the ruby program. Here is the sample which works and makes me confused, cat abc.txt | ~/test/rubysrc/foo.rb thanks in advance, George

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• Flex datagrid - determining when grid has completed renderering?

  - by ccdugga

  hi, i have a datagrid which contains a number of itemrenderers, it is populated each time a user does a search. Is there an event which can tell me when the datagrid has completed rendering all new rows and item renderers? I need to trigger an event once everything has been created so that i can resize then container which holds the grid. Currently im using DataGridEvent.HEADER_RELEASE and CollectionEvent.COLLECTION_CHANGE events to manage this however the problem with these events is that they get called as each new row is being added to the datagrid. therefore the whole process is becoming sluggish. Does anyone have any suggestions?

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• Is there a sample set of web log data available for testing analysis against?

  - by Peter

  Sorry if this isn't strictly speaking a programming question, but I figure my best chance of success would be to ask here. I'm developing some web log file analysis algorithms, but to date I only have access to a fairly small amount of web log data to process. One algorithm I want to use makes some assumptions about 'the shape' of typical web log data, and so I'd like to test it against a larger 'exemplar' - perhaps the logs of a busy site with a good distribution of traffic from different sources etc. Is there a set of such data available somewhere? Thanks for any help.

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• Workaround for PHP SOAP request failure when wsdl defines service port binding as https and port 80?

  - by scooterhanson

  I am consuming a SOAP web service using php5's soap extension. The service' wsdl was generated using Axis java2wsdl, and whatever options are used during generation result in the port binding url being listed as https://xxx.xxx.xxx.xxx**:80** If I download the wsdl to my server, remove the port 80 specification from the port binding location value, and reference the local file in my soapclient call it works fine. However, if I try to reference it remotely (or download it and reference it locally, as-is) the call fails with a soap fault. I have no input into the service side so I can't make them change their wsdl-generation process. So, unless there's a way to make the soapclient ignorant of the port, I'm stuck with using a locally modified copy of someone else' wsdl (which I'd rather not do). Any thoughts on how to make my soapclient ignore the port 80?

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• Getting a value of td of a selected tr in jquery

  - by jaeyun

  Below is my table <table> <tr class=chargeTR> <td id=chargeTD> charge1 </td> </tr class=chargeTR> <td id=chargeTD> charge2 </td> </tr> <table> Below is my jquery call $(".chargeTR").each(function() { // this line works fine $.get("process.php", { value: $(this).find("#chargeTD").val(), // I must be doing something wrong here... }, function(theXML){ alert(theXML); }); }); I cannot get the value "charge1" and "charge2". Can somebody please correct me in this? Thank you,

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• R: Using sapply on vector of POSIXct

  - by Chris

  I have what may be a very simple question. I want to process a column of POSIXct objects from a dataframe and generate a vector of datetime strings. I tried to use the following sapply call dt <- sapply(df$datetime, function(x) format(x,"%Y-%m-%dT%H:%M:%S")) but to no avail. I keep getting the following error Error in prettyNum(.Internal(format(x, trim, digits, nsmall, width, 3L, : invalid 'trim' argument When I apply this function to a single POSIXct object from the column, I have no problem. So I'm stumped at the moment about what the problem is. Do I need to do something special with POSIXct objects?

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• msbuild/clickonce publish files generated during the build

  - by Anonym

  As a part of my build process I generate some files that should be included when creating a clickonce deployment. Here is a blog post of someone telling you how to include items that's not part of the project. However, as someone mentions in the comments of that blogpost, it won't update the deploymentmanifest when you do it in the "BeforePublish" task and the files won't get downloaded - it works fine if you do it in the "BeforeBuild" task though. This gives me a chicken and egg problem as I have to perform the build first to generate the files I want included.. Does anyone have a solution for this ? (p.s. at the moment generating the clickonce deployment using mage.exe is not an option, it have to be done using the Publish target)

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• How to extract all IDs accessed from a mysql general log using the linux commandline?

  - by shlomoid

  This should be a trivial question for anyone who's good with bash/sed/awk. Unfortunately, I'm not, yet :) I've got a general log from MySQL which contains some queries that have a common parameter, they query on a specific id field. The queries look like update tbl set col='binary_values' where id=X; I need to process the log and extract all the IDs that these queries touched, each in it's own line. The purpose of this is to figure out how many times each ID is accessed. Eventually I'd group and count the values. The binary values are indeed binary junk, so they kinda messed up some things I've been trying to do. Eventually we solved the problem temporarily using a python script, but I'm sure the linux command line tool set can do it too. How would you do it?

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• How do you use data binding in C# development ?

  - by MemoryLeak

  Recently I use data binding to speed up my development of C# winforms application. But I found that data binding is just useful when the control is Textbox or textare and text kind of controls. If things come to be radio button, image control or datagridview, it's hard for me to use data binding. For example, it's hard for me to bind a group of radio button to a database field. It's hard for me to pre-process the data in database and then bind to datagridview control(I know I can use view to do this, but it is not that convenient) So I really want to know, most of you guys when will use data binding? And how will you use it ?

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• a4j:commandButton causes full page reload on IE7

  - by Greg Charles

  Our process allows users to activate their account, and then configure e-mail preferences. We're using the tag: <a4j:commandButton id="activate" action="#{controller.agreeAction}" image="/img/ok.png" styleClass="activate-button" reRender="mainContent, sideBar" oncomplete="showEmailDialog();" /> This works fine on Firefox, but on IE, the showEmaiDialog() fires off to display the new dialog, and then the full page reloads, which instantly hides it again. I put in numerous alert() calls to make sure of what was happening. I see the e-mail dialog until I clear the final alert box in in the showEmailDialog() script, and then I see the alerts that I put into jQuery(document).ready(). Why does IE do a full page reload instead of just refreshing the requested sections?

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• How to reload Django models without losing my locals in an interactive session?

  - by Gj

  I'm doing some research with an interactive shell and using a Django app (shell_plus) for storing data and browsing it using the convenient admin. Occasionally I add or change some of the app models, and run a syncdb (or South migration when changing a model). The changes to the models don't take effect in my interactive session even if I re-import the app models. Thus I'm forced to restart the shell_plus and lose my precious locals() in the process. Is there any way to reload the models during a session? Thanks!!

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• Advice on embedding video content via CMS - what format?

  - by ted776

  Hi, if I set up the facility for people to embed video content on their site via their CMS (using TinyMCE editor), is there any reliable cross platform video format that should be used? From what I can find online, the only reliable way to embed and stream video is using FLV. Other formats seem to have caveats, e.g codecs required or quicktime updates required. Ideally I'd like to avoid this type of situation. If it is the case that FLV is the preferred option, then that involves asking people to encode their video content to FLV before uploading, so there is an extra step required here (unless I can set up the encoding in the back end, but this might take a while to process depending on the size of the video). Does anyone have any additional advice on this? The types of video i'd imagine people will be working with is raw camera footage, so i need to figure out the easiest and most reliable way of getting the footage on to a web page.

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• Convert the code from PHP to Ruby

  - by theband

  public function getFtime() { $records=array(); $sql="SELECT * FROM `finishedtime`"; $result=mysql_query($sql); if(!$result){throw new Exception(mysql_error());} if(mysql_num_rows($result)==0){return $records;} while($row=mysql_fetch_assoc($result)){$records[]=$row;} return $records; } I am in the process of learning Ruby, can anyone convert this code into Ruby. This will make me construe on how to run a query and thrown the fetched result back.

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• Dynamic CSS class names in GWT

  - by Anupam Jain

  I am in the process of porting a simple CSS grid system to GWT. My CSS file currently has classes like .size1, .size2 etc., and I have a CSS resource that looks like - class MyResource extends CSSResource { @ClassName("size1") String size1(); @ClassName("size2") String size2(); // And so on } However what I really want, is to have a single function like the following - String size(int size); which will generate the appropriate class when passed the size as an integer at runtime. This is needed as I perform some calculations to determine the actual space available/needed for a widget in javascript and then attach the appropriate class name. Is this something that is even possible with GWT?

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• How well does Solr scale over large number of facet values?

  - by Continuation

  I'm using Solr and I want to facet over a field "group". Since "group" is created by users, potentially there can be a huge number of values for "group". Would Solr be able to handle a use case like this? Or is Solr not really appropriate for facet fields with a large number of values? I understand that I can set facet.limit to restrict the number of values returned for a facet field. Would this help in my case? Say there are 100,000 matching values for "group" in a search, if I set facet.limit to 50. would that speed up the query, or would the query still be slow because Solr still needs to process and sort through all the facet values and return the top 50 ones? Any tips on how to tune Solr for large number of facet values? Thanks.

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• How can I tell if a given hWnd is still valid?

  - by Ian P

  Please forgive my ignorance, I'm completely new when it comes to winforms programming. I'm using a third-party class that spawns an instance of Internet Explorer. This class has a property, hWnd, that returns the hWnd of the process. Later on down the line, I may want to reuse the instance of the application if it still exists, so I need to tell my helper class to attach to it. Prior to doing that, I'd like to know if the given hWnd is still valid, otherwise I'll spawn another instance. How can I do this in C# & .NET 3.5? Thanks for the help and I apologize if my winforms nomenclature is all wacky.. haha Ian

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• Pre-processing data before showing it in AdvancedDataGrid

  - by MinimeDJ

  Hi guys, I want to extend AdvancedDataGrid to show a Waterfall Chart in one of its columns. To do that I already created custom cell render that shows bars as I need. Now I have a little challenge: I have to pre-process data to show my Waterfall Chart properly. I have to do it before my grid is show. So, I assume that I have to extends AdvancedDataGrid and overwrite some methods. Does anybody know where I have to start? Any examples?

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• Refreshing an XML file through HTTPService in Flex

  - by pfunc

  I'm having a problem refreshing an xml file. I am bringing it in through an HTTP service component and putting it into a bindable array _cattArr, that I am using as the dataprovider for a grid. When someone adds an item to the datagrid, it saves to the same xml file. Then I close the window, reopen it and don't see the item that has been added. It is writing to the xml file, because when I restart the flex app, the item has been added, it's just not refreshing it. I have tried to resend the httpservice, but still no luck. What is the correct process for doing this?

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