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  • JS settimeout doesn’t work in IE8…

    - by Nagesh
    <html> <head> <script> var i; i = 0; function loop() { i = i + 1; alert(String(i)); setTimeout("loop()",1000); } setTimeout("loop()",1000); </script> </head> <body> </body> </html> Please try the above code in IE8 it will not give alert message for every 1 sec if you hold right click. But in firefox it will give alert message even though if you dont release the right click. I want the firefox functionality in IE8.

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  • Why trigger fired only once when running on a JQuery Object?

    - by Shlomi.A.
    Hi I got an array. I'm running over it for (i = 0; i < sugestionsArray.length; i++) { $('li.groupCode' + sugestionsArray[i] + ' span').addClass('checkedInput'); $('option[value=' + sugestionsArray[i] + ']').attr('selected', 'selected'); } And this loop runs 3 times perfectly, adding classname and playing with the option. instead of adding a clasname, i'm trying to trigger a click over the span $('li.groupCode' + sugestionsArray[i] + ' span').trigger('click'); which in his turn has a click event bind to it using jq as well Span.click(function() {}) for some reason my loop breaks after the first click. he is leaving the loop and don't continue to the next 2 loops after him. only the first span is been clicked. does anyone has an idea?

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  • BDE, Delphi, ODBC, SQL Native Client & Dead lock

    - by EspenS
    Hi. We have some Delphi code that uses the BDE to Access SQL Server 2008 through the SQL Server Native Client ODBC driver (2005 version). Our issue is that we're experiencing some deadlock issues in a loop doing inserts to multiple tables. The whole loop is done within a [TDatabase].StartTransaction. Looking at the SQL Server Profiler we clearly see that at one point during the loop the SPID (Session ID?) change, and then we naturally end up with a deadlock. (Both SPID doing inserts to the same table) It seems like the BDE at some point does a second connection to the DB... (Although I would love to skip the BDE, it's currently not possible. ) Anyone with experiences to share?

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  • Loops in ada and the implementation

    - by maddy
    HI all, Below is a piece of code shown and doubts are regarding the implementation of loops C := character'last; I := 1; K : loop Done := C = character'first; Count2 := I; Exit K when Done; C := character'pred(c); I := I + 1; end loop K; Can anyone please tell me what does 'K' stands for.I guess its not a variable.How does 'K' control the execution of the loop? Thanks Maddy

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  • orale clients dead wait

    - by Macroideal
    hi all friends I meet a problem yestoday...maybe it's becoz it is april 1st... but it did exist. here i begin clarifying: i have 3 pcs in remote area..2 clients and 1 oracle server.. my app is running seperately in the two clients hourly connecting to the oracles,,my clients worked well be4 April 1th, but suddenly my app in the clients mechines went down...first i did not change any configurations.... i used libsqlora8 to connect the server...I went into a dead loop in the library...I tried sqlplus, but it dead there in my shell terminal, like it meets a infinite loop....no return until i pressed ctrl + c, the reason i guess is "infinite loop" somewhere..... btw, when i used my local pc to connect the server, it worked well...just from this phenomenon, wen can see the is problems lie in the client mechines..and i check the configuration file both in local mechine and client mechines..they are identical have you met a problem like this.... I dont hope it's frank of April 1st

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  • copy or clone a HSSFWorkbook

    - by Fortega
    Hi, Currently I am doing the following in a loop (at least 300 times): - create a HSSFWorkbook from a template file - add some values to specific cells in the workbook - save the workbook as a new excel file The first line takes about 70% of the time (reading excel file). What I would like to do is to take this out of the loop, and read the file only once. In the loop, I would like to copy or clone the template HSSFWorkbook. However, I can't find anything about copying/cloning a HSSFWorkbook. Did some of you do this before? Any tips?

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  • Allowing threads from python after calling a blocking i/o code in a python extension generated using

    - by SS
    I have written a python extension wrapping an existing C++ library live555 (wrapping RTSP client interface to be specific) in SWIG. The extension works when it is operated in a single thread, but as soon as I call the event loop function of the library, python interpreter never gets the control back. So if I create a scheduled task using threading.Timer right before calling the event loop, that task never gets executed once event loop starts. To fix this issue, I added Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS macros manually in the SWIG auto generated wrapper cxx file around every doEventLoop() function call. But now, I want to do the same (i.e. allow threads) when SWIG generates the code itself and not to change any code manually. Has anyone done something similar in SWIG? P.S. - I would also consider switching to any other framework (like SIP) to get this working. I selected SWIG over any other technology is because writing SWIG interface was really very easy and I just had to include the existing header files.

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  • Read data from a text file using Java

    - by Saran
    I need to read a text file line by line using Java. I use available() method of FileInputStream to check and loop over the file. But while reading, the loop terminates after the line before the last one. i.e., if the file has 10lines, the loop reads only the first 9 lines. Snippet used : while(fis.available() > 0) { char c = (char)fis.read(); ..... ..... }

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  • Which are your favorite programming language gadgets?

    - by FerranB
    There are some gadgets/features for programming languages that I like a lot because they save a lot of coding or simply because they are magical or nice. Some of my favorites are: C++ increment/decrement operator: my_array[++c]; C++ assign and sum or substract (...): a += b C# yield return: yield return 1; C# foreach: foreach (MyClass x in MyCollection) PLSQL for loop: for c in (select col1, col2 from mytable) PLSQL pipe row: for i in 1..x loop pipe row(i); end loop; Python Array access operator: a[:1] PLSQL ref cursors. Which are yours?

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  • Matlab postpones disp calls when doing demanding calculations why is that?

    - by Reed Richards
    I am implementing an algorithm in Matlab. Among other things it calculates shortest paths etc. so its quite demanding for my old computer. I've put out disp calls through out the program to see what's happening all the time. However when starting on a particulary heavy for loop the disp seemes not to be called until the loop is over even though it comes before the loop. Why is that? I though that Matlab was really linear or am I just choking it with to many calculations and the disp calls get the lowest priority?

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  • Issue while trying to give a floating effect to a footer bar in IE

    - by Shailesh
    Hi, I'm trying to put a footer bar at the bottom of the browser no matter what the length of the content is. The footer bar should always be visible to the user and should be on the top layer. Following is my code: <html> <head> <style type="text/css"> #wrapper { width: 910px; margin: 0 auto; padding: 0px 20px 50px 20px; text-align: left; } #footer-wrapper { -moz-background-clip:border; -moz-background-inline-policy:continuous; -moz-background-origin:padding; bottom:0; clear:both; font-size:11px !important; left:0; position:fixed; white-space:nowrap; width:100%; z-index:8000; } </style> <script> var counter = 0; function addContent(ctr) { document.getElementById(ctr).innerHTML=document.getElementById (ctr).innerHTML+" dynaContent"+counter; counter++; } </script> </head> <body> <div> <div><input type="button" onclick="addContent('wrapper')" value="Add dynaContent" /></div> <div id="wrapper" style="color:#FFFFFF; background-color: #111111;"> STATIC TEXT - HEADER-WRAPPER </div> <div style="color:#FFFFFF;background-color: #555555;">STATIC TEXT - FOOTER-WRAPPER</div> </div> </body> </html> It's working fine in Mozilla Firefox and giving the intended results, but, in IE, the footer bar always sticks just under the header. Please help. Thanks in advance, Shailesh.

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  • Movable Type: MTIf not working under MTSubCategories?

    - by kohei
    Hi I'm trying to insert UL on every 20th sub category label. This code below doesn't seem to work. It only exports list of sub categories without the UL in it's right place. Any one know what would be wrong? <MTTopLevelCategories> <ul> <MTSubCategories> <mt:If name="__counter__" op="%" value="20" eq="1"> <mt:If name="__counter__" ne="1"> </ul> <ul></mt:If></mt:If> <li><$MTCategoryLabel$></li> </MTSubCategories> </ul> </MTTopLevelCategories> My testing environment: Movable Type 5.01 PHP 5.2.11 MySQL 5 Perl 5.8.9

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  • analysis Big Oh notation psuedocode

    - by tesshu
    I'm having trouble getting my head around algorithm analysis. I seem to be okay identifying linear or squared algorithms but am totally lost with nlogn or logn algorithms, these seem to stem mainly from while loops? Heres an example I was looking at: Algorithm Calculate(A,n) Input: Array A of size n t?0 for i?0 to n-1 do if A[i] is an odd number then Q.enqueue(A[i]) else while Q is not empty do t?t+Q.dequeue() while Q is not empty do t?t+Q.dequeue() return t My best guess is the for loop is executed n times, its nested while loop q times making NQ and the final while loop also Q times resulting in O(NQ +Q) which is linear? I am probably totally wrong. Any help would be much appreciated. thanks

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  • Query Returning value as 0

    - by NIMISH DESHPANDE
    I am trying to execute following PL/SQL script in SQL Developer. The loop should return count of nulls but somehow everytime it is returning 0. set serveroutput on DECLARE --v_count number; v_count_null number; BEGIN execute immediate 'select count(*) from SP_MOSAIX' into v_count; FOR i in (select column_name from all_tab_COLUMNS where table_name = 'SP_MOSAIX') LOOP select count(*) into v_count_null from SP_MOSAIX where i.column_name IS NULL ; dbms_output.put_line(v_count_null); END LOOP; END; So when I run this, following output is what i get: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 But if I manually execute the query subsituting column_name I get the result. select count(*) into v_count_null from SP_MOSAIX where i.column_name IS NULL; Can anybody help on this?

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  • Can I specify the order of how changes happen in an single App Engine transaction ? Is it equal to t

    - by indiehacker
    If I passed a list of key ids as an argument in a transaction, would the change associated with the first key in the list happen first? And if not, how do I specify the order that I want the changes to happen in? As a concrete example, consider this code below from Google Docs Transactions--would changes to the first item in acc.key() happen first? class Accumulator(db.Model): counter = db.IntegerProperty() Docshttp://code.google.com/appengine/docs/python/datastore/transactions.html: def increment_counter(key, amount): obj = db.get(key) obj.counter += amount obj.put() q = db.GqlQuery("SELECT * FROM Accumulator") acc = q.get() db.run_in_transaction(increment_counter, acc.key(), 5)

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  • Java anonymous class efficiency implications

    - by Po
    Is there any difference in efficiency (e.g. execution time, code size, etc.) between these two ways of doing things? Below are contrived examples that create objects and do nothing, but my actual scenarios may be creating new Threads, Listeners, etc. Assume the following pieces of code happen in a loop so that it might make a difference. Using anonymous objects: void doSomething() { for (/* Assume some loop */) { final Object obj1, obj2; // some free variables IWorker anonymousWorker = new IWorker() { doWork() { // do things that refer to obj1 and obj2 } }; } } Defining a class first: void doSomething() { for (/* Assume some loop */) { Object obj1, obj2; IWorker worker = new Worker(obj1, obj2); } } static class Worker implements IWorker { private Object obj1, obj2; public CustomObject(Object obj1, Object obj2) {/* blah blah */} @Override public void doWork() {} }; Thank you :)

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  • Joining different models in Django

    - by Andrew Roberts
    Let's say I have this data model: class Workflow(models.Model): ... class Command(models.Model): workflow = models.ForeignKey(Workflow) ... class Job(models.Model): command = models.ForeignKey(Command) ... Suppose somewhere I want to loop through all the Workflow objects, and for each workflow I want to loop through its Commands, and for each Command I want to loop through each Job. Is there a way to structure this with a single query? That is, I'd like Workflow.objects.all() to join in its dependent models, so I get a collection that has dependent objects already cached, so workflows[0].command_set.get() doesn't produce an additional query. Is this possible?

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  • Update tableview instantly as data pushed in core data iphone

    - by user336685
    I need to update the tableview as soon as the content is pushed in core data database. for this AppDelegate.m contains following code NSManagedObjectContext *moc = [self managedObjectContext]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:[NSEntityDescription entityForName:@"FeedItem" inManagedObjectContext:moc]]; //for loop // push data in code data & then save context [moc save:&error]; ZAssert(error == nil, @"Error saving context: %@", [error localizedDescription]); //for loop ends This code triggers following code from RootviewController.m - (void)controllerWillChangeContent:(NSFetchedResultsController*)controller { [[self tableView] beginUpdates]; } But this updates the tableview only at the end of the for loop ,the table does not get updated after immediate push in db. I tried following code but that didn't work - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller { // In the simplest, most efficient, case, reload the table view. [self.tableView reloadData]; } I have been stuck with this problem for several days.Please help.Thanks in advance for solution.

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  • Hibernate Lazy init exception in spring scheduled job

    - by Noam Nevo
    I have a spring scheduled job (@Scheduled) that sends emails from my system according to a list of recipients in the DB. This method is annotated with the @Scheduled annotation and it invokes a method from another interface, the method in the interface is annotated with the @Transactional annotation. Now, when i invoke the scheduled method manually, it works perfectly. But when the method is invoked by spring scheduler i get the LazyInitFailed exception in the method implementing the said interface. What am I doing wrong? code: The scheduled method: @Component public class ScheduledReportsSender { public static final int MAX_RETIRES = 3; public static final long HALF_HOUR = 1000 * 60 * 30; @Autowired IScheduledReportDAO scheduledReportDAO; @Autowired IDataService dataService; @Autowired IErrorService errorService; @Scheduled(cron = "0 0 3 ? * *") // every day at 2:10AM public void runDailyReports() { // get all daily reports List<ScheduledReport> scheduledReports = scheduledReportDAO.getDaily(); sendScheduledReports(scheduledReports); } private void sendScheduledReports(List<ScheduledReport> scheduledReports) { if(scheduledReports.size()<1) { return; } //check if data flow ended its process by checking the report_last_updated table in dwh int reportTimeId = scheduledReportDAO.getReportTimeId(); String todayTimeId = DateUtils.getTimeid(DateUtils.getTodayDate()); int yesterdayTimeId = Integer.parseInt(DateUtils.addDaysSafe(todayTimeId, -1)); int counter = 0; //wait for time id to update from the daily flow while (reportTimeId != yesterdayTimeId && counter < MAX_RETIRES) { errorService.logException("Daily report sender, data not ready. Will try again in one hour.", null, null, null); try { Thread.sleep(HALF_HOUR); } catch (InterruptedException ignore) {} reportTimeId = scheduledReportDAO.getReportTimeId(); counter++; } if (counter == MAX_RETIRES) { MarketplaceServiceException mse = new MarketplaceServiceException(); mse.setMessage("Data flow not done for today, reports are not sent."); throw mse; } // get updated timeid updateTimeId(); for (ScheduledReport scheduledReport : scheduledReports) { dataService.generateScheduledReport(scheduledReport); } } } The Invoked interface: public interface IDataService { @Transactional public void generateScheduledReport(ScheduledReport scheduledReport); } The implementation (up to the line of the exception): @Service public class DataService implements IDataService { public void generateScheduledReport(ScheduledReport scheduledReport) { // if no recipients or no export type - return if(scheduledReport.getRecipients()==null || scheduledReport.getRecipients().size()==0 || scheduledReport.getExportType() == null) { return; } } } Stack trace: ERROR: 2012-09-01 03:30:00,365 [Scheduler-15] LazyInitializationException.<init>(42) | failed to lazily initialize a collection of role: com.x.model.scheduledReports.ScheduledReport.recipients, no session or session was closed org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.x.model.scheduledReports.ScheduledReport.recipients, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375) at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:122) at org.hibernate.collection.PersistentBag.size(PersistentBag.java:248) at com.x.service.DataService.generateScheduledReport(DataService.java:219) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy208.generateScheduledReport(Unknown Source) at com.x.scheduledJobs.ScheduledReportsSender.sendScheduledReports(ScheduledReportsSender.java:85) at com.x.scheduledJobs.ScheduledReportsSender.runDailyReports(ScheduledReportsSender.java:38) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273) at org.springframework.scheduling.support.MethodInvokingRunnable.run(MethodInvokingRunnable.java:65) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:51) at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) ERROR: 2012-09-01 03:30:00,366 [Scheduler-15] MethodInvokingRunnable.run(68) | Invocation of method 'runDailyReports' on target class [class com.x.scheduledJobs.ScheduledReportsSender] failed org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.x.model.scheduledReports.ScheduledReport.recipients, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375) at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:122) at org.hibernate.collection.PersistentBag.size(PersistentBag.java:248) at com.x.service.DataService.generateScheduledReport(DataService.java:219) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) at $Proxy208.generateScheduledReport(Unknown Source) at com.x.scheduledJobs.ScheduledReportsSender.sendScheduledReports(ScheduledReportsSender.java:85) at com.x.scheduledJobs.ScheduledReportsSender.runDailyReports(ScheduledReportsSender.java:38) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:616) at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:273) at org.springframework.scheduling.support.MethodInvokingRunnable.run(MethodInvokingRunnable.java:65) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:51) at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636)

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  • Are Scala "continuations" just a funky syntax for defining and using Callback Functions?

    - by Alex R
    And I mean that in the same sense that a C/Java for is just a funky syntax for a while loop. I still remember when first learning about the for loop in C, the mental effort that had to go into understanding the execution sequence of the three control expressions relative to the loop statement. Seems to me the same sort of effort has to be applied to understand Continuations (in Scala and I guess probably other languages). And then there's the obvious follow-up question... if so, then what's the point? It seems like a lot of pain (language complexity, programmer errors, unreadable programs, etc) for no gain.

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  • How can I iterate over a recordset within a stored procedure?

    - by David
    I need to iterate over a recordset from a stored procedure and execute another stored procedure using each fields as arguments. I can't complete this iteration in the code. I have found samples on the internets, but they all seem to deal with a counter. I'm not sure if my problem involved a counter. I need the T-SQL equivalent of a foreach Currently, my first stored procedure stores its recordset in a temp table, #mytemp. I assume I will call the secondary stored procedure like this: while (something) execute nameofstoredprocedure arg1, arg2, arg3 end

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  • Error Handling for Application in PHP

    - by Zubair1
    I was wondering if someone can show me a good way to handle errors in my PHP app, that i am also easily able to reuse in my codes. So far i have been using the following functions: Inline Errors function display_errors_for($fieldname) { global $errors; if (isset($errors[$fieldname])) { return '<label for="' .$fieldname. '" class="error">' . ucfirst($errors[$fieldname]). '</label>'; } else { return false; } } All Errrors function display_all_errors($showCounter = true) { global $errors; $counter = 0; foreach ($errors as $errorFieldName => $errorText) { if ($showCounter == true) { $counter++; echo '<li>' . $counter . ' - <label for="' .$errorFieldName. '">' .$errorText. '</label></li>'; } else { echo '<li><label for="' .$errorFieldName. '">' .$errorText. '</label></li>'; } } } I have a $errors = array(); defined on the top of my global file, so it is appended to all files. The way i use it is that if i encounter an error, i push a new error key/value to the $errors array holder, something like the following: if (strlen($username) < 3) { $errors['username'] = "usernames cannot be less then 3 characters."; } This all works great and all, But i wondering if some one has a better approach for this? with classes? i don't think i want to use Exceptions with try/catch seems like an overkill to me. I'm planning to make a new app, and i'll be getting my hands wet with OOP alot, though i have already made apps using OOP but this time i'm planning to go even deeper and use OOP approach more extensively. What i have in mind is something like this, though its just a basic class i will add further detail to it as i go deeper and deeper in my app to see what it needs. class Errors { public $errors = array(); public function __construct() { // Initialize Default Values // Initialize Methods } public function __destruct() { //nothing here too... } public function add($errorField, $errorDesc) { if (!is_string($errorField)) return false; if (!is_string($errorDesc)) return false; $this->errors[$errorField] = $errorDesc; } public function display($errorsArray) { // code to iterate through the array and display all errors. } } Please share your thoughts, if this is a good way to make a reusable class to store and display errors for an entire app, or is getting more familiar with exceptions and try/catch my only choice?

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  • Java Convert ColorSpace of BufferedImage to CS_GRAY without using ConvertColorOp

    - by gmatt
    I know its possible to convert an image to CS_GRAY using public static BufferedImage getGrayBufferedImage(BufferedImage image) { BufferedImageOp op = new ColorConvertOp(ColorSpace .getInstance(ColorSpace.CS_GRAY), null); BufferedImage sourceImgGray = op.filter(image, null); return sourceImgGray; } however, this is a chokepoint of my entire program. I need to do this often, on 800x600 pixel images and takes about 200-300ms for this operation to complete, on average. I know I can do this alot faster by using one for loop to loop through the image data and set it right away. The code above on the other hand constructs a brand new 800x600 BufferedImage that is gray scale. I would rather just transform the image I pass in. Does any one know how to do this with a for loop and given that the image is RGB color space?

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