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• Storing statistics of multple data types in SQL Server 2008

  - by Mike

  I am creating a statistics module in SQL Server 2008 that allows users to save data in any number of formats (date, int, decimal, percent, etc...). Currently I am using a single table to store these values as type varchar, with an extra field to denote the datatype that it should be. When I display the value, I use that datatype field to format it. I use sprocs to calculate the data for reporting; and the datatype field to convert to the appropriate datatype for the appropriate calculations. This approach works, but I don't like storing all kinds of data in a varchar field. The only alternative that I can see is to have separate tables for each datatype I want to store, and save the record information to the appropriate table based on datatype. To retreive, I run a case statement to join the appropriate table and get the data. This seems to solve. This however, seems like a lot of work for ... what gain? Wondering if I'm missing something here. Is there a better way to do this? Thanks in advance!

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• cocoa - making a UIImageView class act like a UIButton

  - by Mike

  For some reason that will take too much time to explain, I have to create a UIImageView based class that has some properties of a button. Imagine a class like the UISwitch (no I cannot base my class on the UISwitch) with two states, on and off. WHen the user selects one state, it runs a method like a button that was clicked and the method receives the sender id. I have already the class more or less working. The class is based on UIImageView. I am having difficulties to understand the following. WHen I create a new button I have a line that is like [myButton addTarget:self action:NSSelectorFromString(myMethod) forControlEvents:UIControlEventTouchUpInside]; This line defines a target and an action to run when the button is triggered. I my case I would need something like [myObject addTarget:self action:myMethod ifState:1] //or another thing ifState:2 I have no idea what kind of code I should put on the class to make this work. Remember that as a button the class should send the "sender" information to identify the object which triggered the action... Can you guys, transcendental gurus help? thanks for any help!

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• SQL: How to select rows from a table while ignoring the duplicate field values?

  - by Maxxon

  How to select rows from a table while ignoring the duplicate field values? Here is an example: id user_id message 1 Adam "Adam is here." 2 Peter "Hi there this is Peter." 3 Peter "I am getting sick." 4 Josh "Oh, snap. I'm on a boat!" 5 Tom "This show is great." 6 Laura "Textmate rocks." What i want to achive is to select the recently active users from my db. Let's say i want to select the 5 recently active users. The problem is, that the following script selects Peter twice. mysql_query("SELECT * FROM messages ORDER BY id DESC LIMIT 5 "); What i want is to skip the row when it gets again to Peter, and select the next result, in our case Adam. So i don't want to show my visitors that the recently active users were Laura, Tom, Josh, Peter, and Peter again. That does not make any sense, instead i want to show them this way: Laura, Tom, Josh, Peter, (skipping Peter) and Adam. Is there an SQL command i can use for this problem?

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• Zend framework "invalid controller" error message

  - by stef

  When I load the homepage of a ZF site I get a message saying "Invalid controller specified (error)" where "error" seems to be the name of the controller. In my bootstrap.php I have the snippet below where I added the prints statement in the catch(): // Dispatch the request using the front controller. try { $frontController->dispatch(); } catch (Exception $exception) { print $exception; exit; exit($exception->getMessage()); } This prints out: exception 'Zend_Controller_Dispatcher_Exception' with message 'Invalid controller specified (error)' in /www/common/ZendFramework/library16/Zend/Controller/Dispatcher/Standard.php:241 Stack trace: #0 /www/common/ZendFramework/library16/Zend/Controller/Front.php(934): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #1 /www/site.com/htdocs/application/bootstrap.php(38): Zend_Controller_Front->dispatch() #2 /www/site.com/htdocs/public/index.php(16): require('/www/site....') #3 {main} Can anyone make sense out of what it going on? I have a hunch it has something to do with case sensitivity and the naming conventions of ZF. The initial "invalid controller" message comes from the snippet below print $request->getControllerName(); if (!$this->isDispatchable($request)) { $controller = $request->getControllerName(); if (!$this->getParam('useDefaultControllerAlways') && !empty($controller)) { require_once 'Zend/Controller/Dispatcher/Exception.php'; throw new Zend_Controller_Dispatcher_Exception('Invalid controller specified (' . $request->getControllerName() . ')'); } $className = $this->getDefaultControllerClass($request); } This all prints out "indexerrorInvalid controller specified (error)" so it looks like it's trying to load the index controller first, can not and then has a problem loading the error controller. Could it just be that the path to the controller files is wrong?

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• Limit the number of service calls in a RESTful application

  - by Slavo

  Imagine some kind of a banking application, with a screen to create accounts. Each Account has a Currency and a Bank as a property, Currency being a separate class, as well as Bank. The code might look something like this: public class Account { public Currency Currency { get; set; } public Bank Bank { get; set; } } public class Currency { public string Code { get; set; } public string Name { get; set; } } public class Bank { public string Name { get; set; } public string Country { get; set; } } According to the REST design principles, each resource in the application should have its own service, and each service should have methods that map nicely to the HTTP verbs. So in our case, we have an AccountService, CurrencyService and BankService. In the screen for creating an account, we have some UI to select the bank from a list of banks, and to select a currency from a list of currencies. Imagine it is a web application, and those lists are dropdowns. This means that one dropdown is populated from the CurrencyService and one from the BankService. What this means is that when we open the screen for creating an account, we need to make two service calls to two different services. If that screen is not by itself on a page, there might be more service calls from the same page, impacting the performance. Is this normal in such an application? If not, how can it be avoided? How can the design be modified without going away from REST?

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• C# Regex - Replace multiple characters at once without overwriting?

  - by Everaldo Aguiar

  Hello guys, I'm implementing a c# program that should automatize a Mono-alphabetic substitution cipher. The functionality i'm working on at the moment is the simplest one: The user will provide a plain text and a cipher alphabet, for example: Plain text(input): THIS IS A TEST Cipher alphabet: A - Y, H - Z, I - K, S - L, E - J, T - Q Cipher Text(output): QZKL KL QJLQ I thought of using regular expressions since I've been programming in perl for a while, but I'm encountering some problems on c#. First I would like to know if someone would have a suggestion for a regular expression that would replace all occurrence of each letter by its corresponding cipher letter (provided by user) at once and without overwriting anything. Example: In this case, user provides plaintext "TEST", and on his cipher alphabet, he wishes to have all his T's replaced with E's, E's replaced with Y and S replaced with J. My first thought was to substitute each occurrence of a letter with an individual character and then replace that character by the cipherletter corresponding to the plaintext letter provided. Using the same example word "TEST", the steps taken by the program to provide an answer would be: 1 - replace T's with (lets say) @ 2 - replace E's with # 3 - replace S's with & 4 - Replace @ with E, # with Y, & with j 5 - Output = EYJE This solution doesn't seem to work for large texts. I would like to know if anyone can think of a single regular expression that would allow me to replace each letter in a given text by its corresponding letter in a 26-letter cipher alphabet without the need of splitting the task in an intermediate step as I mentioned. If it helps visualize the process, this is a print screen of my GUI for the program: http://img43.imageshack.us/img43/2118/11618743.jpg

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• Remote JMS connection still using localhost

  - by James

  I have a created a JMS Connection Factory on a remote glassfish server and want to use that server from a java client app on my local machine. I have the following configuration to get the context and connection factory: Properties env = new Properties(); env.setProperty("java.naming.factory.initial", "com.sun.enterprise.naming.SerialInitContextFactory"); env.setProperty("java.naming.factory.url.pkgs", "com.sun.enterprise.naming"); env.setProperty("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl"); env.setProperty("org.omg.CORBA.ORBInitialHost", JMS_SERVER_NAME); env.setProperty("org.omg.CORBA.ORBInitialPort", "3700"); initialContext = new InitialContext(env); TopicConnectionFactory topicConnectionFactory = (TopicConnectionFactory) initialContext.lookup("jms/MyConnectionFactory"); topicConnection = topicConnectionFactory.createTopicConnection(); topicConnection.start(); This seems to work and when I delete the ConnectionFactory from the glassfish server I get a exception indicating that is can't find jms/MyConnectionFactory as expected. However when I subsequently use my topicConnection to get a topic it tries to connect to localhost:7676 (this fails as I am not running glassfish locally). If I dynamically create a topic: TopicSession pubSession = topicConnection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE); Topic topic = pubSession.createTopic(topicName); TopicPublisher publisher = pubSession.createPublisher(topic); Message mapMessage = pubSession.createTextMessage(message); publisher.publish(mapMessage); and the glassfish server is not running locally I get the same connection refused however, if I start my local glassfish server the topics are created locally and I can see them in the glassfish admin console. In case you ask I do not have jms/MyConnectionFactory on my local glassfish instance, it is only available on the remote server. I can't see what I am doing wrong here and why it is trying to use localhost at all. Any ideas? Cheers, James

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• jQuery cycle plugin customizing

  - by spirax

  I'm using the jQuery Cycle plugin to start a slidshow of images when hovering over the initial image. This works fine. What I want after that is to have the slideshow stop when hovered off, and have a manual slideshow (next/prev buttons) start. This currently works, but the slideshow starts from the beginning each time it's initialized. I want it to begin at the current image that's loaded. I was playing around with getting the image's index from the DOM (as it's the only one with display:block) and using the option 'startingSlide' to resume it, but my index keeps returning as -1. jQuery('#home-menu li').hover(function() { setImages(jQuery(this).attr('title'), jQuery(this).find('.subtitle').text()); jQuery('#main .blog #projects .gallery .slideshow').cycle( { fx: 'scrollHorz', easing: 'easeOutBounce', speed: 2000, delay: 0 }); }, function() { // Before loading the images for the clickable slideshow, find the current image in the DOM array to use as the starting position slideshowStart = jQuery('.gallery .slideshow img:visible').index(this); console.log('Index: ' + slideshowStart); setImages(jQuery(this).attr('title'), jQuery(this).find('.subtitle').text()); jQuery('#main .blog #projects .gallery .slideshow').cycle('stop').cycle( { fx: 'scrollHorz', easing: 'easeOutBounce', startingSlide: slideshowStart, speed: 2000, timeout: 0, next: "#main .blog #projects .gallery span.span2", prev: "#main .blog #projects .gallery span.span1" }); }); setImages() just loads images into the DOM based on what li is being hovered over. Nothing special there. I want the image to be resumed when hovered over and hovered off. I've left out the resume part for hover on for the moment while I was trying to get it working - In case you were wondering.

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• Displaying ppt, doc, and xls in UIWebView doesn't work but pdf does

  - by slugolicious

  It looks like a few people on stackoverflow get this to work but their code isn't posted. I'm using [web loadData:data MIMEType:MIMEType textEncodingName:@"UTF-8" baseURL:nil]; where MIMEType is: @"application/vnd.ms-powerpoint" @"application/vnd.ms-word" @"application/vnd.ms-excel" (BTW, I've seen DOC files use mimetype @"application/msword" but the "vnd" version seems more appropriate. I tried both just in case.) I verified that my 'data' is correct. PDF and TXT files work. When the UIWebView displays PPT, DOC, or XLS files, it's blank. I put NSLOG statements in my UIWebViewDelegate calls. shouldStartLoadWithRequest:<NSMutableURLRequest about:blank> navType:5 webViewDidStartLoad: didFailLoadWithError:Error Domain=NSURLErrorDomain Code=100 UserInfo=0x122503a0 "Operation could not be completed. (NSURLErrorDomain error 100.)" didFailLoadWithError:Error Domain=WebKitErrorDomain Code=102 UserInfo=0x12253840 "Frame load interrupted" so obviously the load is failing, but why? If I change my mimetype to @"text/plain" for a PPT file, the UIWebView loads fine and displays unprintable characters, as expected. That's telling me the 'data' passed to loadData: is ok. Meaning my mimetypes are bad? And just to make sure my PPT, DOC, and XLS files are indeed ok to display, I created a simple html file with anchor tags to the files. When the html file is displayed in Safari on the iPhone, clicking on the files displays correctly in Safari. I tried to research the error code displayed in didFailLoadWithError (100) but all the documented error codes are negative and greater than 1000 (as seen in NSURLError.h). -(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { NSLog(@"didFailLoadWithError:%@", error); }

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• Dynamic programming in VB

  - by Rahul Jain

  Hello Everybody, We develop applications for SAP using their SDK. SAP provides a SDK for changing and handling events occuring in the user interface. For example, with this SDK we can catch a click on a button and do something on the click. This programming can be done either VB or C#. This can also be used to create new fields on the pre-existing form. We have developed a specific application which allows users to store the definition required for new field in a database table and the fields are created at the run time. So far, this is good. What we require now is that the user should be able to store the validation code for the field in the database and the same should be executed on the run time. Following is an example of such an event: Private Sub SBO_Application_ItemEvent(ByVal FormUID As String, ByRef pVal As SAPbouiCOM.ItemEvent, ByRef BubbleEvent As Boolean) Handles SBO_Application.ItemEvent Dim oForm As SAPbouiCOM.Form If pVal.FormTypeEx = "ACC_QPLAN" Then If pVal.EventType = SAPbouiCOM.BoEventTypes.et_LOST_FOCUS And pVal.BeforeAction = False Then oProdRec.ItemPressEvent(pVal) End If End If End Sub Public Sub ItemPressEvent(ByRef pVal As SAPbouiCOM.ItemEvent) Dim oForm As SAPbouiCOM.Form oForm = oSuyash.SBO_Application.Forms.GetForm(pVal.FormTypeEx, pVal.FormTypeCount) If pVal.EventType = SAPbouiCOM.BoEventTypes.et_LOST_FOCUS And pVal.BeforeAction = False Then If pVal.ItemUID = "AC_TXT5" Then Dim CardCode, ItemCode As String ItemCode = oForm.Items.Item("AC_TXT2").Specific.Value CardCode = oForm.Items.Item("AC_TXT0").Specific.Value UpdateQty(oForm, CardCode, ItemCode) End If End If End Sub So, what we need in this case is to store the code given in the ItemPressEvent in a database, and execute this in runtime. I know this is not straight forward thing. But I presume there must be some ways of getting these kind of things done. The SDK is made up of COM components. Thanks & Regards, Rahul Jain

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• Is there any danger in calling free() or delete instead of delete[]? [closed]

  - by Matt Joiner

  Possible Duplicate: ( POD )freeing memory : is delete[] equal to delete ? Does delete deallocate the elements beyond the first in an array? char *s = new char[n]; delete s; Does it matter in the above case seeing as all the elements of s are allocated contiguously, and it shouldn't be possible to delete only a portion of the array? For more complex types, would delete call the destructor of objects beyond the first one? Object *p = new Object[n]; delete p; How can delete[] deduce the number of Objects beyond the first, wouldn't this mean it must know the size of the allocated memory region? What if the memory region was allocated with some overhang for performance reasons? For example one could assume that not all allocators would provide a granularity of a single byte. Then any particular allocation could exceed the required size for each element by a whole element or more. For primitive types, such as char, int, is there any difference between: int *p = new int[n]; delete p; delete[] p; free p; Except for the routes taken by the respective calls through the delete-free deallocation machinery?

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• SSRS - Oracle DB, Passing Date parameter

  - by davidl98

  Using SSRS with an Oracle Database. I need to prompt the user when running the report to enter a date for report. What is the best way to add in the parameter in my SSRS Report. Having problem finding the right date format. under the "Report Parameter" menu, I have setup the Report Parameters using the DateTime Datatype. Keep getting this error "ORA-01843: Not a Valid Month" Thank you for your help. Select a.OPR_Name, a.OPR, a.Trans_Desc, a.Trans_Start_Date, Cast(a.S_Date as date) as S_Date, Sum(a.Duration) as T From ( Select US_F.OPR_Name, ITH_F.OPR, ITH_F.ITH_RID, ITH_F.TRANSACT, Transact.DESC_1 as Trans_Desc, To_CHAR(ITH_F.Start_Time,'DD-Mon-YY') as Trans_Start_Date, To_CHAR(ITH_F.Start_Time,'MM/DD/YYYY') as S_Date, Substr(To_CHAR(ITH_F.Start_Time,'HH24:MI'),1,6) as Start_Time, To_CHAR(ITH_F.End_Time,'DD-Mon-YY') as Trans_End_Date, Substr(To_CHAR(ITH_F.End_Time,'HH24:MI'),1,6) as End_Time, Cast(Case When To_CHAR(ITH_F.Start_Time,'DD-Mon-YY') = To_CHAR(ITH_F.End_Time,'DD-Mon-YY') Then (((To_CHAR(ITH_F.End_Time,'SSSSS') - To_CHAR(ITH_F.Start_Time,'SSSSS')) / 60))/60 Else ((86399 - (To_CHAR(ITH_F.Start_Time,'SSSSS')) + To_CHAR(ITH_F.End_Time,'SSSSS'))/60)/60 End as Decimal(3,1)) as Duration from Elite_76_W1.ITH_F Left Join Elite_76_W1.Transact on Transact.Transact = ITH_F.Transact Left Join Elite_76_W1.US_F on US_F.OPR = ITH_F.OPR Where ITH_F.TRANSACT not in ('ASN','QC','LGOT') ) a Where a.S_Date = @Event_Date Having Sum(a.Duration) < 0 Group By a.OPR_Name, a.OPR, a.Trans_Desc, a.Trans_Start_Date, a.S_Date Order by a.OPR_Name

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• best practice for directory polling

  - by Hieu Lam

  Hi all, I have to do batch processing to automate business process. I have to poll directory at regular interval to detect new files and do processing. While old files is being processed, new files can come in. For now, I use quartz scheduler and thread synchronization to ensure that only one thread can process files. Part of the code are: application-context.xml <bean id="methodInvokingJob" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean" <property name="targetObject" ref="documentProcessor" / <property name="targetMethod" value="processDocuments" / </bean DocumentProcessor ..... public void processDocuments() { LOG.info(Thread.currentThread().getName() + " attempt to run."); if (!processing) { synchronized (this) { try { processing = true; LOG.info(Thread.currentThread().getName() + " is processing"); List xmlDocuments = documentManager.getFileNamesFromFolder(incomingFolderPath); // loop over the files and processed unlock files. for (String xmlDocument : xmlDocuments) { processDocument(xmlDocument); } } finally { processing = false; } } } } For the current code, I have to prevent other thread to process files when one thread is processing. Is that a good idea ? or we support multi-threaded processing. In that case how can I know which files is being process and which files has just arrived ? Any idea is really appreciated.

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• Method for finding memory leak in large Java heap dumps

  - by Rickard von Essen

  I have to find a memory leak in a Java application. I have some experience with this but would like advice on a methodology/strategy for this. Any reference and advice is welcome. About our situation: Heap dumps are larger than 1 GB We have heap dumps from 5 occasions. We don't have any test case to provoke this. It only happens in the (massive) system test environment after at least a weeks usage. The system is built on a internally developed legacy framework with so many design flaws that they are impossible to count them all. Nobody understands the framework in depth. It has been transfered to one guy in India who barely keeps up with answering e-mails. We have done snapshot heap dumps over time and concluded that there is not a single component increasing over time. It is everything that grows slowly. The above points us in the direction that it is the frameworks homegrown ORM system that increases its usage without limits. (This system maps objects to files?! So not really a ORM) Question: What is the methodology that helped you succeed with hunting down leaks in a enterprise scale application?

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• Table design issues - should I create separate fields or store as a blob

  - by Ali

  Hi guys I'm working on my web based ordering system and we would like to maintain a kind of task history for each of our orders. A hsitory in the sense that we would like to maintain a log of who did what on an order like lets say an order has been entered - we would like to know if the order was acknowledged for an example. Or lets say somebody followed up on the order - etc. Consider that there are numerous situations like this for each order would it be wise to create a schema on the lines of: Orders ID - title - description - date - is_ack - is_follow - ack_by ..... That accounts to a lot of fields - on teh other hand I could have one LongText field called 'history' and fill it with a serialised object holding all the information. However in the latter case I can't run a query to lets say retrieve all orders that have not been acknowledged and stuff like that. With time requirements woudl change and I would be required to modify it to allow for more detailed tracking and that is why I need to set up a way which would be feasible to scale upon yet I don't want to be restricted on the SQL side too much.

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• jQuery filename manipulation

  - by Adi

  Hi all, I am trying to do a fancy blur/fade effect (which means i need 2 images) but I only want to load 1 in the HTML (in case js is not active) and add the other filename via jQuery (copying and renaming the file/src) The pure html is along the lines of: <div id="work"> <div> <img src="css/images/abc1.jpg" width="360" height="227" alt="" /> </div> <div> <img src="css/images/xyz1.jpg" width="360" height="227" alt="" /> </div> </div> But the html after jquery has manipulated the DOM needs to be like: <div id="work"> <div> <img src="css/images/abc0.jpg" width="360" height="227" alt="" /> <img src="css/images/abc1.jpg" width="360" height="227" alt="" /> </div> <div> <img src="css/images/xyz0.jpg" width="360" height="227" alt="" /> <img src="css/images/xyz1.jpg" width="360" height="227" alt="" /> </div> </div> The question is, what is the jQuery to clone/copy the relative images and then rename the src? Any help would be much appreicated. A.

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• Objective-C object release and allocation timing

  - by ryanjm.mp

  The code for this question is too long to be of any use. But I'm pretty sure my problem has to do with releasing a class. I have a helper class, ConnectionHelper.h/.m, that handles a NSURLConnection for me. Basically, I give it the URL I want and it returns the data (it happens to do a quick json parse on it too). It has a delegate which I set to the calling class (in this case: DownloadViewController). When it finishes the download, it calls [delegate didFinishParseOf:objectName withDictionary:dictionary];. Then in DownloadViewController I release ConnectionHelper and alloc a new one in order to download the next object. My problem is, I do this once, and then it creates the connection for the second one, and then my program just crashes. After this call: [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyNever]; NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; Then I don't think any of the following methods are called: - (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge So am I right in that I'm not releasing something? When I release it the first time, the dealloc function isn't being called. Is there a way I can "force" it to deallocate? Do I need to force it to? I didn't think it would matter since I allocating a new ConnectionHelper for the new call. How else would they overlap / conflict with each other? Thank you.

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• JTable listener problem

  - by newbie123

  I added a mouse clicked listner to my jtable, when i double click the row, will pop up an window accordingly. jTable.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent e) { double amount = Double.parseDouble(jTable.getValueAt(getSelectedRow(), 4).toString()); String remarks = jTable.getValueAt(getSelectedRow(), 3).toString(); String transactionID = jTable.getValueAt(getSelectedRow(), 1).toString(); new EditFrame(...) } }); This code I used to retrieve the row selected row. public int getSelectedRow() { jTable.getSelectionModel().addListSelectionListener( new ListSelectionListener() { public void valueChanged(ListSelectionEvent event) { int viewRow = jTable.getSelectedRow(); selectedRow = viewRow; System.out.println(viewRow); } }); return selectedRow; } In my case, I realised when I clicked the second row in the first time, I get null for selectedRow, only when I select first row then second row, I then can get the correct data. And If I removed the mouse listener the problem then be solved. Is it because I doing something wrong at the mouse click listener?

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• Access Violation When Writing Dynamic 2D Array... Sometimes

  - by Shraptnel

  This program is meant to generate a dynamic array, however it gives an access violation error when writing when given certain dimensions. Eg: R = 6, C = 5 crashes, but then R = 5, C = 6 doesn't. In case your wondering, it isn't my homework to "fix" this broken program, this is the method we were taught in class. Also part of my assessment is to use this method, so vectors are out. Thanks in advance! #include <iostream> using namespace std; int main(){ const int R = 6; const int C = 5; char **d; d = new char *[R]; for(int i=0; i<C; ++i){ d[i] = new char[C]; } //initialise for(int i=0; i<R; ++i){ for(int j=0; j<C; ++j){ d[i][j] = 'd'; cout<<d[i][j]; } cout<<endl; } cout<<endl; system("pause"); return 0; }

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• Is there something like a "long running offline transaction" for NHibernate or any other ORM?

  - by Vilx-

  In essence this is a followup of this question. I'm beginning to feel that I should give up the whole idea, but I'll give it one more shot. What I want is pretty much like a DB transaction. It should track my changes to the DB and then in the end allow me to either commit or rollback them. If I insert an object, I should get it back in my next (appropriate) SELECT query. If I delete it, future SELECT queries should not return it. Etc. But there is one catch - this transaction would be very long running. It would start when the user opened a form (I'm talking about Windows Forms here), and the commit/rollback would be when the user closed it(with OK/Cancel). So it could take anywhere between seconds and days. This requirement rules out a standard DB transaction because that would lock the tables/rows it touched, and other users wouldn't be able to use the system. Also the transaction should not commit ANY changes to the DB until it was really committed. So if one user makes some changes, others don't see them until OK button is hit. This prevents errors in case the computer crashes or is disconnected from the network. I'm quite OK if the solution puts constraints on my model (I'm using MSSQL 2008, btw). I can design the DB/code any way I like. I'm also fine with the idea that a commit could fail because someone already modified one of the objects my transaction touched. Is there anything like this? I looked at NHibernate.Burrow, but I'm not sure that that's the thing I want. Added: It's the very beginning of the project so I'm not tied to NHibernate. I started out with it but I can still change easily.

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• Why doesn't every class in the .Net framework have a corresponding interface?

  - by Thorsten Lorenz

  Since I started to develop in a test/behavior driven style, I appreciated the ability to mock out every dependency. Since mocking frameworks like Moq work best when told to mock an interface, I now implement an interface for almost every class I create b/c most likely I will have to mock it out in a test eventually. Well, and programming to an interface is good practice, anyways. At times, my classes take dependencies on .Net classes (e.g. FileSystemWatcher, DispatcherTimer). It would be great in that case to have an interface, so I could depend on an IDispatcherTimer instead, to be able to pass it a mock and simulate its behavior to see if my system under test reacts correctly. Unfortunately both of above mentioned classes do not implement such interfaces, so I have to resort to creating adapters, that do nothing else but inherit from the original class and conform to an interface, that I then can use. Here is such an adapter for the DispatcherTimer and the corresponding interface: using System; using System.Windows.Threading; public interface IDispatcherTimer { #region Events event EventHandler Tick; #endregion #region Properties Dispatcher Dispatcher { get; } TimeSpan Interval { get; set; } bool IsEnabled { get; set; } object Tag { get; set; } #endregion #region Public Methods void Start(); void Stop(); #endregion } /// <summary> /// Adapts the DispatcherTimer class to implement the <see cref="IDispatcherTimer"/> interface. /// </summary> public class DispatcherTimerAdapter : DispatcherTimer, IDispatcherTimer { } Although this is not the end of the world, I wonder, why the .Net developers didn't take the minute to make their classes implement these interfaces from the get go. It puzzles me especially since now there is a big push for good practices from inside Microsoft. Does anyone have any (maybe inside) information why this contradiction exists?

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• Extracting bool from istream in a templated function

  - by Thomas Matthews

  I'm converting my fields class read functions into one template function. I have field classes for int, unsigned int, long, and unsigned long. These all use the same method for extracting a value from an istringstream (only the types change): template <typename Value_Type> Value_Type Extract_Value(const std::string& input_string) { std::istringstream m_string_stream; m_string_stream.str(input_string); m_string_stream.clear(); m_string_stream >> value; return; } The tricky part is with the bool (Boolean) type. There are many textual representations for Boolean: 0, 1, T, F, TRUE, FALSE, and all the case insensitive combinations Here's the questions: What does the C++ standard say are valid data to extract a bool, using the stream extraction operator? Since Boolean can be represented by text, does this involve locales? Is this platform dependent? I would like to simplify my code by not writing my own handler for bool input. I am using MS Visual Studio 2008 (version 9), C++, and Windows XP and Vista.

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• Bind members of different classes

  - by 7vies

  In a C++ program I have two classes (structs) like struct A { int x; double y; // other members }; struct B { int x; double y2; // other members }; I'd like to somehow "bind" the corresponding members, e.g. A::x to B::x and A::y to B::y2. By "bind" I mean ability to obtain a reference to the bound variable, for example given a member of class A I could assign it to the value of the corresponding B member. Once I have such bind, I'd like to build a bind table or something similar which I could iterate over. This would allow, for example, copying the corresponding fields from A a; to B b; like CopyBound(a, b, bind_table);, but probably also doing some other things not limited to Copy interface. The problem with this bind_table is that I want static typing and the bind_table would have to contain different types in this case. For example, a table of pointers to class members would contain &A::x and &A::y, but they are of different type, so I cannot just put them say into an array. Any ideas how this can be conveniently implemented, having as much compile-time type checking as possible?

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• QT- QImage and multi-threading problem.

  - by umanga

  Greetings all, Please refer to image at : http://i48.tinypic.com/316qb78.jpg We are developing an application to extract cell edges from MRC images from electron microscope. MRC file format stores volumetric pixel data (http://en.wikipedia.org/wiki/Voxel) and we simply use 3D char array(char***) to load and store data (gray scale values) from a MRC file. As shown in the image,there are 3 viewers to display XY,YZ and ZX planes respectively. Scrollbars on the top of the viewers use to change the image slice along an axis. Here is the steps we do when user changes the scrollbar position. 1) get the new scrollbar value.(this is the selected slice) 2) for the relavant plane (YZ,XY or ZX), generate (char* slice;) array for the selected slice by reading 3D char array (char***) 3) Create a new QImage* (Format_RGB888) and set pixel values by reading 'slice' (using img-setPixel(x,y,c);) 4) This new QImage* is painted in the paintEvent() method. We are going to execute "edge-detection" process in a seperate thread since it is an intensive process.During this process we need to draw detected curve (set of pixels) on top of above QImage*.(as a layer).This means we need to call drawPoint() methods outside the QT thread. Is it the best wayto use QImage for this case? What is the best way to execute QT drawing methods from another thread? thanks in advance,

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• Create win task to run once and delete immediately using C#

  - by pencilslate

  Here is the use case: - Create a new win task, run immediately and once complete, delete the task. Here is basic code to create a task using C#. using (TaskService ts = new TaskService(null)) { string projectName = "runnowtest" + Guid.NewGuid().ToString(); //create new task TaskDefinition td = ts.NewTask(); Trigger mt = null; //setup task as Registration trigger mt = td.Triggers.AddNew(TaskTriggerType.Registration); mt.StartBoundary = DateTime.Now; //delete the task 1 minute after the program ends td.Settings.DeleteExpiredTaskAfter = new TimeSpan(0, 1, 0); //run the notepad++ in the task td.Actions.Add(new ExecAction("notepad.exe")); //register task Task output = ts.RootFolder.RegisterTaskDefinition(projectName, td); //check output Console.WriteLine(output != null ? "Task created" : "Task not created"); } The API doesn't seem to have a property/flag to mark task as run once. I am trying to ensure the above task runs only once and deletes immediately after that. Any thoughts are much appreciated!

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