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  • Java Apache Commons users

    - by Tom Brito
    Is there anything in apache commons to convert a Object to byte array, like the following method does? public static byte[] toByteArray(Object obj) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(baos); oos.writeObject(obj); oos.flush(); byte[] data = baos.toByteArray(); return data; } [try-finally block closing buffers were omitted to simplify]

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  • iPad/iPhone uiSearchbar transparent background

    - by Tom
    I know this questions was asked(and solved) before, but this wont work for me. as a matter of fact, I had it already solved, but this issue came back out of nowhere and struck me on the head. I am not able to set the background of my UISearchBar transparent. I was always using: searchBar.backgroundColor = [UIColor clearColor]; [[searchBar.subviews objectAtIndex:0] removeFromSuperview]; and it worked nicely... but suddenly it stopped. could be since I upgraded my xcode-version but I am not sure. I spent a couple of hours already investigating this.. Is somebody out there to do this? please point me in the right direction. thanks heaps!!! best regards T

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  • What techniques can be used to detect so called "black holes" (a spider trap) when creating a web crawler?

    - by Tom
    When creating a web crawler, you have to design somekind of system that gathers links and add them to a queue. Some, if not most, of these links will be dynamic, which appear to be different, but do not add any value as they are specifically created to fool crawlers. An example: We tell our crawler to crawl the domain evil.com by entering an initial lookup URL. Lets assume we let it crawl the front page initially, evil.com/index The returned HTML will contain several "unique" links: evil.com/somePageOne evil.com/somePageTwo evil.com/somePageThree The crawler will add these to the buffer of uncrawled URLs. When somePageOne is being crawled, the crawler receives more URLs: evil.com/someSubPageOne evil.com/someSubPageTwo These appear to be unique, and so they are. They are unique in the sense that the returned content is different from previous pages and that the URL is new to the crawler, however it appears that this is only because the developer has made a "loop trap" or "black hole". The crawler will add this new sub page, and the sub page will have another sub page, which will also be added. This process can go on infinitely. The content of each page is unique, but totally useless (it is randomly generated text, or text pulled from a random source). Our crawler will keep finding new pages, which we actually are not interested in. These loop traps are very difficult to find, and if your crawler does not have anything to prevent them in place, it will get stuck on a certain domain for infinity. My question is, what techniques can be used to detect so called black holes? One of the most common answers I have heard is the introduction of a limit on the amount of pages to be crawled. However, I cannot see how this can be a reliable technique when you do not know what kind of site is to be crawled. A legit site, like Wikipedia, can have hundreds of thousands of pages. Such limit could return a false positive for these kind of sites. Any feedback is appreciated. Thanks.

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  • How can I dismiss keyboard in iPhone OS 3.2 with text field in popover?

    - by Tom H
    I have several text fields in a custom uiviewcontroller subclass, which is displayed within a popover. The popover is displayed form a bar button. I want the keyboard to go down when the popover is dismissed (either by the user tapping the bar button again, or tapping outside the popover. From the view controller that displays the popover, when the popover is dismissed, in either of the 2 fashions, I call [optionsController dismissFirstResponder]; Optionscontroller is the uiviewcontroller subclass in the popover. Dismissfirstresponder is a method I defined: -(void)dsimissFirstResponder { [nameField resignFirstResponder]; [descriptionField resignFirstResponder]; [helpField resignFirstResponder]; } Those are three IBoutlets which I connected in the xib to the text fields. That doesn't work. Any help with this would be greatly appreciated.

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  • 2-Version software: Best VCS approach?

    - by Tom R
    I suppose I'd better explain my situation: I'm in the process of developing some software, and I'm at the stage where I'd like to split my project into two branches which differ in features. It so happens that this application is an Android application which I will be deploying on the Market, which has the constraint that every app must have a unique package identifier (sensible, no?). My current approach has been to clone the git repo of my original project, but this causes issues with package names. I want the system to be robust enough so that a bugfix/new feature on one branch will merge into another branch, but only when I want it to. Does anyone have any suggestions?

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  • Simple continuously running XMPP client in python

    - by tom
    I'm using python-xmpp to send jabber messages. Everything works fine except that every time I want to send messages (every 15 minutes) I need to reconnect to the jabber server, and in the meantime the sending client is offline and cannot receive messages. So I want to write a really simple, indefinitely running xmpp client, that is online the whole time and can send (and receive) messages when required. My trivial (non-working) approach: import time import xmpp class Jabber(object): def __init__(self): server = 'example.com' username = 'bot' passwd = 'password' self.client = xmpp.Client(server) self.client.connect(server=(server, 5222)) self.client.auth(username, passwd, 'bot') self.client.sendInitPresence() self.sleep() def sleep(self): self.awake = False delay = 1 while not self.awake: time.sleep(delay) def wake(self): self.awake = True def auth(self, jid): self.client.getRoster().Authorize(jid) self.sleep() def send(self, jid, msg): message = xmpp.Message(jid, msg) message.setAttr('type', 'chat') self.client.send(message) self.sleep() if __name__ == '__main__': j = Jabber() time.sleep(3) j.wake() j.send('[email protected]', 'hello world') time.sleep(30) The problem here seems to be that I cannot wake it up. My best guess is that I need some kind of concurrency. Is that true, and if so how would I best go about that? EDIT: After looking into all the options concerning concurrency, I decided to go with twisted and wokkel. If I could, I would delete this post.

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  • Diagnosing IIS Shutdowns

    - by Tom Ritter
    Symptoms: I attach a debugger, I wait a little while, it automatically detaches I watch the event log during normal operation - after a single request comes in, it waits a little bit, the shuts down Disagnosing. I've followed the following steps for logging shutdowns in IIS: http://weblogs.asp.net/scottgu/archive/2005/12/14/433194.aspx http://blogs.msdn.com/tess/archive/2006/08/02/asp-net-case-study-lost-session-variables-and-appdomain-recycles.aspx I know these are working because... What I see in the Event Logs when I change the web.config: The description for Event ID 0 from source ASP.NET 2.0.50727.0 cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event: _shutdownMessage=IIS configuration change HostingEnvironment initiated shutdown CONFIG change CONFIG change HostingEnvironment caused shutdown _shutdownStack= at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo) at System.Environment.get_StackTrace() at System.Web.Hosting.HostingEnvironment.InitiateShutdownInternal() at System.Web.Hosting.HostingEnvironment.InitiateShutdown() at System.Web.Hosting.PipelineRuntime.StopProcessing() the message resource is present but the message is not found in the string/message table But it doesn't help because the mysetery error doesn't tell me anything. I see the same thing as from before I added this extra logging: The description for Event ID 0 from source ASP.NET 2.0.50727.0 cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event: _shutdownMessage=HostingEnvironment initiated shutdown HostingEnvironment caused shutdown _shutdownStack= at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo) at System.Environment.get_StackTrace() at System.Web.Hosting.HostingEnvironment.InitiateShutdownInternal() at System.Web.Hosting.HostingEnvironment.InitiateShutdown() at System.Web.Hosting.PipelineRuntime.StopProcessing() the message resource is present but the message is not found in the string/message table Anyone have any ideas for more debugging?

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  • MySQL: Storage of multiple text fields for a record

    - by Tom
    An inexperienced question: I need to store about 10 unknown-length text fields per record into a MySQL table. I expect no more than 50K rows in total for this table but speed is important. The database actions will be solely SELECTs for all practical purposes. I'm using InnoDB. In other words: id | text1 | text2 | text3 | .... | text10 As I understand that MySQL will store the text elsewhere and use its own indicators on the table itself, I'm wondering whether there's any fundamental performance implications that I should be worrying about given the way the data is stored? (i.e. several "sub-fetches" from the table). Thank you.

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  • Amazon Product API: "Your request is missing a required parameter combination" on Blended ItemSearch

    - by Daniel Schaffer
    I'm having some problems trying to do an ItemSearch on the Blended index using the Amazon Product API. According to the documentation, Blended requests cannot specify the MerchantId parameter - and indeed, if I try to include it I get an error telling me so. However, when I don't include it, I get an error telling me that my request is missing a required parameter combination and that a valid combination includes MerchantId... what the hell? Here's the XML response: <Items xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05"> <Request> <IsValid>False</IsValid> <ItemSearchRequest> <Availability>Available</Availability> <Condition>All</Condition> <Keywords> home theater pc and other geekery</Keywords> <ResponseGroup>Similarities</ResponseGroup> <ResponseGroup>SalesRank</ResponseGroup> <ResponseGroup>OfferSummary</ResponseGroup> <ResponseGroup>Small</ResponseGroup> <ResponseGroup>Images</ResponseGroup> <SearchIndex>Blended</SearchIndex> </ItemSearchRequest> <Errors> <Error> <Code>AWS.MissingParameterCombination</Code> <Message>Your request is missing a required parameter combination. Required parameter combinations include MerchantId, Availability.</Message> </Error> </Errors> </Request> </Items> The failing requests are being sent as part of batches with other requests that are succeeding. I'm using REST to send my requests, so here's an example of a request: http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=-------------& ItemSearch.1.Keywords=Mates%20of%20State& ItemSearch.1.MerchantId=Amazon& ItemSearch.1.SearchIndex=DVD& ItemSearch.2.Keywords=teaching%20Lily%20various%20computer%20related%20skills& ItemSearch.2.SearchIndex=Blended& ItemSearch.Shared.Availability=Available& ItemSearch.Shared.Condition=All& ItemSearch.Shared.ResponseGroup=Small%2CSalesRank%2CImages%2COfferSummary%2CSimilarities& Operation=ItemSearch%2CSimilarityLookup& Service=AWSECommerceService& SimilarityLookup.1.ItemId=B000FNNHZ2& SimilarityLookup.2.ItemId=B000EQ5UPU& SimilarityLookup.Shared.Availability=Available& SimilarityLookup.Shared.Condition=All& SimilarityLookup.Shared.MerchantId=Amazon& SimilarityLookup.Shared.ResponseGroup=Small%2CSalesRank%2CImages%2COfferSummary& Timestamp=2010-04-02T17%3A18%3A05Z& Signature=---------------- Any ideas as to what I'm doing wrong?

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  • PHP Fatal error, trying to request method inside model multiple times

    - by Tom
    The error message [23-Mar-2010 08:36:16] PHP Fatal error: Cannot redeclare humanize() (previously declared in /Users/tmclssns/Sites/nadar/nadar/trunk/webapp/application/filer/models/Filer/Aggregate.php:133) in /Users/tmclssns/Sites/nadar/nadar/trunk/webapp/application/filer/models/Filer/Aggregate.php on line 133 I have a "Filer" model which contains several methods to generate graphs. Each method in there related to generating graphs has the suffix "Graph" in the method name. As we have some performance issues, I try to render the graphs in advance (using cron) instead of rendering them on each request. The code below is what I came up with: public function generategraphsAction() { $this->_helper->viewRenderer->setNoRender(); $config = Zend_Registry::get('config'); $id = $this->_getParam('filerid'); $filer = new Filer($id); $filer_methods = get_class_methods($filer); foreach ($filer_methods as $filer_method) { if (preg_match('/^(.*)Graph$/i', $filer_method, $matches)) { $path = $config->imaging_caching_dir . "/$id/{$matches[1]}.png"; $filer->$matches[0]($path); } } // var_dump(get_class_methods($filer)); die; } The result from the var_dump(), when uncommented, is: array 0 => string '__construct' (length=11) 1 => string 'find_by_name' (length=12) 2 => string 'getPartner' (length=10) 3 => string 'getSlots' (length=8) 4 => string 'getGroups' (length=9) 5 => string 'grouplist' (length=9) 6 => string 'getAggregates' (length=13) 7 => string 'getVolumes' (length=10) 8 => string 'getAggregateVolumes' (length=19) 9 => string 'getShelves' (length=10) 10 => string 'getAutoSupportHistory' (length=21) 11 => string 'getAutoSupportMail' (length=18) 12 => string 'getOrphans' (length=10) 13 => string 'getAll' (length=6) 14 => string 'getDiskRevOverview' (length=18) 15 => string 'getDiskTypeOverview' (length=19) 16 => string 'getDiskTypeSizeFunctionOverview' (length=31) 17 => string 'getLicenses' (length=11) 18 => string 'removeGroup' (length=11) 19 => string 'addGroup' (length=8) 20 => string 'hasGroup' (length=8) 21 => string 'aggdefaultGraph' (length=15) 22 => string 'aggbarGraph' (length=11) 23 => string 'voldefaultGraph' (length=15) 24 => string 'volbarGraph' (length=11) 25 => string 'replicationGraph' (length=16) 26 => string 'getReplicationData' (length=18) 27 => string 'humanize' (length=8) 28 => string 'getFiler' (length=8) 29 => string 'getOptions' (length=10) 30 => string 'getCifsInfo' (length=11) 31 => string 'getCifsStats' (length=12) 32 => string '__get' (length=5) 33 => string 'tr' (length=2) 34 => string 'trs' (length=3) 35 => string 'fieldList' (length=9) The generategraphsAction() method finds the 'Graph' methods correctly: array 0 => string 'aggdefaultGraph' (length=15) 1 => string 'aggdefault' (length=10) array 0 => string 'aggbarGraph' (length=11) 1 => string 'aggbar' (length=6) array 0 => string 'voldefaultGraph' (length=15) 1 => string 'voldefault' (length=10) array 0 => string 'volbarGraph' (length=11) 1 => string 'volbar' (length=6) array 0 => string 'replicationGraph' (length=16) 1 => string 'replication' (length=11) However when the first graph is generated, it generates the above listed PHP fatal error. Anyone can come up with a solution to this? I tried to pass by reference or switch a few things around (like re declare the Filer model, $current_filer = new Filer($id); and unset() it again after the request, but resulted in the same error) without much success. The referenced method "humanize" isn't used for anything I'm doing at the moment, but belongs to the Model because it's used in several other places. Of course, removing the method is not really an option right now, and the model contains several other methods as well so I assume if I just move the humanize method around, it will generate an error on the next one. For reference, the humanize() method: public function humanize ($kbytes, $unit = null) { // KiloByte, Megabyte, GigaByte, TeraByte, PetaByte, ExaByte, ZettaByte, YottaByte $units = array('KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'); if (null !== $units) { $i = array_search(substr($unit, -2), $units); if (! $i) { $i = floor((strlen($kbytes) - 1) / 3); } } else { $i = floor((strlen($kbytes) - 1) / 3); } $newSize = round($kbytes / pow(1024, $i), 2); return $newSize . $units[$i]; } Thanks in advance for the help offered.

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  • Setting Mnemonics and Hot Keys for a JOptionPane Dialog

    - by Daniel Bingham
    Is it possible to assign hotkeys and mnemonics to the buttons in a JOptionPane Dialog? I'd like to be able, in a JOptionPane generated message dialog with the options Yes, No and Cancel, press Y to hit the Yes button, N to hit the No button and escape to activate the escape button. Similarly in a dialog with Okay and Cancel buttons I'd like to be able to activate them with enter and escape. I've attempted passing JButtons into the JOptionPane's button Object array with the Mnemonics set already. The mnemonics work and the buttons show up correctly in the dialogs, however, they do not act properly when they are activated. Most noticeably they do not dispose of the dialog. What is the correct way to add hotkeys and Mnemonics to a JOptionPane Dialog's buttons? As always, my apologies ahead of time if this is a duplicate - I searched both Google and Stackoverflow and found nothing.

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  • C++ Zig-Zag Scan with libjpeg

    - by Tom
    Hi, right now i am implementing a Zig-Zag scan in C++. In addition to that i use the libJpeg8a. I want to intervene into the process when encoding images. My questions is: How can i connect to the scanning process out of C++??? Or: And where exactly is the zig zag scan located within the libJpeg???

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  • Perl: Unsuccessful stat on filename containing newline. What?

    - by Daniel
    Hello, I am getting an error I do not understand. I am using File:find to recurse a fylesystem on windows using Activestate Perl 5.8.8 and trying to stat $File::Find::name; so I am not stat-ing a filename got from a text file scanning requiring chomp-ing or newline removing. I was unable to get file modification time, the m in: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = stat($File::Find::name); so trying a -s $File::Find::name give me the error: "Unsuccessful stat on filename containing newline" A typical file name found is F01-01-10 Num 0-00000.pdf but I get the same error even renaming in E02.pdf Some ideas about a possible reason for this error?

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  • How to know which process hold a semnum with a specific number?

    - by Daniel
    For the following truss output, we can see the process post to 11 processes whose semnum is 49,32, ..etc, is there anyway to find out which process hold semnum 49, and which process holds setnum32, etc? /1: semop(67108928, 0xFFFFFFFF7FFF9F4C, 11) = 0 /1: semnum=49 semop=1 semflg=0 /1: semnum=32 semop=1 semflg=0 /1: semnum=52 semop=1 semflg=0 /1: semnum=41 semop=1 semflg=0 /1: semnum=40 semop=1 semflg=0 /1: semnum=55 semop=1 semflg=0 /1: semnum=46 semop=1 semflg=0 /1: semnum=35 semop=1 semflg=0 /1: semnum=37 semop=1 semflg=0 /1: semnum=48 semop=1 semflg=0 /1: semnum=39 semop=1 semflg=0

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  • The Immerman-Szelepcsenyi Theorem

    - by Daniel Lorch
    In the Immerman-Szelepcsenyi Theorem, two algorithms are specified that use non-determinisim. There is a rather lengthy algorithm using "inductive counting", which determines the number of reachable configurations for a given non-deterministic turing machine. The algorithm looks like this: Let m_{i+1}=0 For all configurations C Let b=0, r=0 For all configurations D Guess a path from I to D in at most i steps If found Let r=r+1 If D=C or D goes to C in 1 step Let b=1 If r<m_i halt and reject Let m_{i+1}=m_{i+1}+b I is the starting configuration. m_i is the number of configurations reachable from the starting configuration in i steps. This algorithm only calculates the "next step", i.e. m_i+1 from m_i. This seems pretty reasonable, but since we have nondeterminisim, why don't we just write: Let m_i = 0 For all configurations C Guess a path from I to C in at most i steps If found m_i = m_i + 1 What is wrong with this algorithm? I am using nondeterminism to guess a path from I to C, and I verify reachability I am iterating through the list of ALL configurations, so I am sure to not miss any configuration I respect space bounds I can generate a certificate (the list of reachable configs) I believe I have a misunderstanding of the "power" of non-determinisim, but I can't figure out where to look next. I am stuck on this for quite a while and I would really appreciate any help.

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  • Div Unique CSS Style Links

    - by Tom
    Hi, I want to create unique styles for my links in a single particular div (So for example I want all links bold and red in the main body, but in the sidebardiv I want them blue and italic) How do I go about it? I have: a:link{ color:#666666; } a:visited{ color:#003300; } a:hover{ color:#006600; } a:active{ color:#006600; } however if I put that in the sidebar div section it messes up my }'s

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  • What is the best way, if possible, to send information from a Java PrintStream to a JTextPane?

    - by Daniel Reeves
    In Java, I have a package that translates XML metadata from one standard to another. This package is ultimately accessed through a single function and sends all of its output through a PrintStream object. The output sent is just a status of each file and whether or not it was translated. This is pretty fine and dandy if I'm just printing to System.out, but I'm actually wanting to print this to a JTextPane while it translates (kind of like a progress text box). It wouldn't be a big deal to just print the status after it was done translating the XML, but since there may be thousands of XML files, that's just not feasible. One thing that I've tried is to use a thread that takes all of the information from the PrintStream (which is attached to a ByteArrayOutputStream) and let it send any new information to the text pane. Unfortunately, this still sends the information all at once at the end of the translation. This does work correctly for System.out. Here's the code that does the translation and tries to show the output: public class ConverterGUI extends javax.swing.JFrame { boolean printToResultsBox = false; PrintStream printStream = null; ByteArrayOutputStream baos = null; private class ResultsPrinter implements Runnable { public ResultsPrinter() { baos = new ByteArrayOutputStream(); printStream = new PrintStream(baos); } public void run() { String tempString = ""; while (printToResultsBox) { try { if (!baos.toString().equals(tempString)) { tempString = baos.toString(); resultsBox.setText(tempString); } } catch (Exception ex) { } } } } ... ResultsPrinter rp = new ResultsPrinter(); Thread thread = new Thread(rp); thread.start(); // Do the translation. try { printToResultsBox = true; boolean success = false; TranslationEngine te = new TranslationEngine(); // fileOrFolderToConvert is a text box in the GUI. // linkNeeded and destinationFile are just parameters for the translation process. success = te.translate(fileOrFolderToConvert.getText(), linkNeeded, destinationFile, printStream); if (success) { printStream.println("File/folder translation was a success."); } resultsBox.setText(baos.toString()); } catch (Exception ex) { printStream.println("File translation failed."); } finally { printToResultsBox = false; } ... } Ultimately, this code prints out to the JTextPane just fine after all the translation is done but not during. Any suggestions? Do I need to change the PrintStream to something else?

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  • Unit testing a SQL code generator

    - by Tom H.
    The team I'm on is currently writing code in TSQL to generate TSQL code that will be saved as scripts and later run. We're having a little difficulty in separating our unit tests between testing the code generator parts and testing the actual code that they generate. I've read through another similar question, but I was hoping to get some specific examples of what kind of unit test cases we might have. As an example, let's say that I have a bit of code that simply generates a DROP statement for a view, given the view schema and name. Do I just test that the generated code matches some expected outcome using string comparisons and then in a later integration or system test make sure that the drop actually drops the view if it exists, does nothing if the view doesn't exist, or raises an error if the view is one that we are marking as not allowing a drop? Thanks for any advice!

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  • Exclude files only in "release" in VS2008 config

    - by Tom
    Hi Guys, I was wondering how to "Exclude" individual files in the "release" web.csproj config of my solution. I've seen other answers and they all feature "include" - but this is not what I am wanting to achieve. I only want to exclude around 10-15 files from a "release" package ? I don't want to manually edit the web.csproj file - so is there any way I can do this via web.config or ? How would I go about doing this ?

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