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• Why is VB6 still so widely used?

  - by Uri

  Note that this question is not meant to start an argument, I am genuinely curious: Back in the 90s I used to work for a large CPU maker and we were building some debuggers. All our core logic was in C++, but the GUI was made in VB6. We couldn't figure out MFC and it was too much a hassle. We glued together VB6 and C++ using COM which we created via ATL. Fast forward to 2009, having been mostly in the Java world I am looking at job boards and seeing more VB6 jobs than I expected. I genuinely thought that VB6 was extinct, especially since VB.NET supposedly solved a lot of the problems with the VB6 which at the time felt a lot like a scripting language than a true OOP language. So what happened? Why is new code still written in it? Isn't there a better way to glue C++ and VB.NET? Note that I haven't used VB.NET, I just understand that it is a much more "stricter" language than VB6 was. Even with Option Explicit or whatever it was.

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• How do you decide which API function documentations to read and how seriously?

  - by Uri

  Suppose that you are writing or maintaining a piece of code that uses some API that you are not 100% familiar with. How do you decide whether to read the documentation of a certain call target, and how much time to spend reading it? How do you decide not to read it? (Let's assume you can read it by opening the HTML documentation, inspecting the source code, or using the hover mechanism in the IDE).

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• What is the appropriate terminology in Java when building remote proxies?

  - by Uri

  Suppose that I am implementing a remote proxy in Java to an object that is likely to reside on a remote server but may reside locally. There's my real object on the remote server, there's the local implementation (the proxy itself), and there's the interface I provide to my program which hides the details of where the object actually is. The local representation may contact a local or a remote implementation of the object. What is the standard terminology in Java for these things? What should I name my interfaces/classes? I've seen the terms Subjects, Images, and Implementations thrown around (probably from the GOF days), but I wonder what is acceptable way to do the naming for a framework written in Java.

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• Findbugs warning: Equals method should not assume anything about the type of its argument

  - by Uri

  When running FindBugs on my project, I got a few instances of the error described above. Namely, my overriding versions of equals cast the RHS object into the same type as the object in which the overriding version is defined. However, I'm not sure whether a better design is possible, since AFAIK Java does not allow variance in method parameters, so it is not possible to define any other type for the equals parameter. Am I doing something very wrong, or is FindBugs too eager? A different way to phrase this question is: what is the correct behavior if the object passed to equals is not the same type as an LHS: Is this a false, or should there be an exception? For example: public boolean equals(Object rhs) { MyType rhsMyType = (MyType)rhs; // Should throw exception if(this.field1().equals(rhsMyType.field1())... // Or whatever }

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• How to implement blocking request-reply using Java concurrency primitives?

  - by Uri

  My system consists of a "proxy" class that receives "request" packets, marshals them and sends them over the network to a server, which unmarshals them, processes, and returns some "response packet". My "submit" method on the proxy side should block until a reply is received to the request (packets have ids for identification and referencing purposes) or until a timeout is reached. If I was building this in early versions of Java, I would likely implement in my proxy a collection of "pending messages ids", where I would submit a message, and wait() on the corresponding id (with a timeout). When a reply was received, the handling thread would notify() on the corresponding id. Is there a better way to achieve this using an existing library class, perhaps in java.util.concurrency? If I went with the solution described above, what is the correct way to deal with the potential race condition where a reply arrives before wait() is invoked?

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• How do I calculate percentiles with python/numpy?

  - by Uri

  Is there a convenient way to calculate percentiles for a sequence or single-dimensional numpy array? I am looking for something similar to Excel's percentile function. I looked in NumPy's statistics reference, and couldn't find this. All I could find is the median (50th percentile), but not something more specific.

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• In Java, is there a way to obtain the command line parameters even if main() didn't save them?

  - by Uri

  We have a program with a main() that parses certain CLPs but does not save them anywhere. I then have my own plug-in code that needs access to the original CLPs (so I can transmit more parameters) for it. However, I cannot change main() I saw that there is apparently a way to do this in C#, I'm looking for an equivalent Java solution on Linux. UPDATE: Obviously, I'm aware of how main() works. Unfortunately, I cannot change the existing application or the way it is invoked (except for CLPs). I can only access via a sandboxed plugin code. My question is whether there is a way to get the command line (rather then the environment variables with -D) that the JVM was invoked with.

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• Which package from CPAN should I use to send mail?

  - by Uri

  Which package from CPAN should I use to send mail? Sometime the timtowtdi approach is very tiring. For me, especially when it comes to package selection. So all I want is to send email, potentially HTML emails. Between Mail-Sendmail, Mail-Sender, NET-SMTP (by the way - not available in PPM), Mail-SendEasy, and the 80 or so other packages that have 'Mail' in their package name - which one should I choose? And while in this subject, what is your general apprach to choose the "canonical" package for a jog. I.e. the package that "everybody is using". Is there any rating or popularity billboard somewhere?

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• Style question: Writing "this." before instance variable and methods: good or bad idea?

  - by Uri

  One of my nasty (?) programming habits in C++ and Java is to always precede calls or accesses to members with a this. For example: this.process(this.event). A few of my students commented on this, and I'm wondering if I am teaching bad habits. My rationale is: 1) Makes code more readable — Easier to distinguish fields from local variables. 2) Makes it easier to distinguish standard calls from static calls (especially in Java) 3) Makes me remember that this call (unless the target is final) could end up on a different target, for example in an overriding version in a subclass. Obviously, this has zero impact on the compiled program, it's just readability. So am I making it more or less readable? Related Question Note: I turned it into a CW since there really isn't a correct answer.

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• HASHREF in Perl

  - by Uri

  I'm trying to decrypt a Perl code which I'm not familiar with, somehow related to HashRef. I'm using Amazon::S3, but my question is a general Perl question. See the code below: use Amazon::S3; my $s3 = Amazon::S3-new( ... ); my $response = $s3-buckets; Documentation (here) sais, about s3-buckets: Returns undef on error, else HASHREF of results The following line is working for me, but I don't understand why: for $b in ( @ { $response-{buckets} } ) { print "bucket: " . $b-bucket . "\n"; } I'm buzzled by each operator on the first line. What type exactly are $response, $respone-{bucket}. Looks like the expression within the 'for' is an array, but I don't understand this syntax: @{ ... }?

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• XML cdata tgas being erased when there's input in Russian

  - by Uri

  Hello, I have a very strange problem which I will be very thankful if someone would help me with. I have a form that has a textarea whose content is later transferred to a page that has a line like this (using DOM with php to change data on an XML file): $dom-getElementsByTagName("page")-item($itemNum)-getElementsByTagName("lang")-item(1)-getElementsByTagName("text")-item(0)-firstChild-data=$_POST['rus0']; The XML file in question looks like this: The strange thing happens when I upload it to the server and try to input Russian text, in which case it erases the CDATA completely and results in And, weirdly, the thing works fine on my own server emulator (I'm using MAMP with php 5, the remote server also has php 5) - in my machine inputing Russian works fine. Any ideas what's going on in this?

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• Looking for a reliable and efficient Java library for Formal Concept Analysis

  - by Uri

  I need to perform Formal Concept Analysis on the fly and am looking for an efficient SDK for calculating the concepts for a given context. There are a lot of research tools around but I'm looking for something supported and reliable. Any help would be appreciated

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• Associate List<T>.Remove to an event in C#?

  - by Uri

  Hi guys, I have a Products:List<Product> class. I'd like to make it so that every time that I remove an item from that list, my program decreases a counter. Is there a way to do it without overriding the Remove method or decreasing it manually? And if there is none, anybody knows where I can find the code for the Remove method? Thanks! I thought about associating the Remove method to an event, but I don't know how to do it without overriding it or creating another method with the Remove method inside it. Excuse me for my ignorance, but I'm just getting into OOP programming.

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• Clicking the mouse down to drag objects on Mac

  - by Uri

  I've been using the following code to issue clicks programmatically on a Mac void PostMouseEvent(CGMouseButton button, CGEventType type, const CGPoint point) { CGEventRef theEvent = CGEventCreateMouseEvent(NULL, type, point, button); CGEventSetType(theEvent, type); CGEventPost(kCGHIDEventTap, theEvent); CFRelease(theEvent); } void Click(const CGPoint point) { PostMouseEvent(kCGMouseButtonLeft, kCGEventMouseMoved, point); NSLog(@"Click!"); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseDown, point); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseUp, point); } Now, I'm trying to click down to be able to drag objects, like a scroll bar or an application's window. I'm using the following: PostMouseEvent(kCGMouseButtonLeft, kCGEventMouseMoved, point); NSLog(@"Click Down!"); PostMouseEvent(kCGMouseButtonLeft, kCGEventLeftMouseDown, point); When i ran the code above something interesting will happen, when the left mouse down is issue nothing seem to happen, I move my mouse and the window doesn't move, however when I added a mouse up event then the window jumped to the location where I supposedly dragged it. this is sort of OK, however, how do I can make the mouse click down and drag an object? Note: I do have a whole method to see when the mouse stopped moving so I can click up. please post code. Thanks

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• What is the best approach using JDBC for parameterizing an IN clause?

  - by Uri

  Say that I have a query of the form SELECT * FROM MYTABLE WHERE MYCOL in (?) And I want to parameterize the arguments to in. Is there a straightforward way to do this in Java with JDBC, in a way that could work on multiple databases without modifying the SQL itself? The closest question I've found had to do with C#, I'm wondering if there is something different for Java/JDBC.

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• When accessing ResultSets in JDBC, is there an elegant way to distinguish between nulls and actual z

  - by Uri

  When using JDBC and accessing primitive types via a result set, is there a more elegant way to deal with the null/0 than the following: int myInt = rs.getInt(columnNumber) if(rs.wasNull())? { // Treat as null } else { // Treat as 0 } I personally cringe whenever I see this sort of code. I fail to see why ResultSet was not defined to return the boxed integer types (except, perhaps, performance) or at least provide both. Bonus points if anyone can convince me that the current API design is great :) My solution was to write a wrapper that returns an Integer (I care more about elegance of client code than performance), but I'm wondering if I'm missing a better way to do this.

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• How do you deal with the more mundane parts of programming tasks?

  - by Uri

  My experience as a developer is that many projects or tickets are a mix of a short and focused very interesting task (e.g., designing some API or a platform to solve something) and a lot of repetitive and mundane tasks that cannot be automated (such as certain refactorings to use the API or platform, implementation of certain tests, some GUI handling, etc). I believe that this is the nature of our profession, unless we are high-level architects or managements and can delegate this work. The only item in my personal arsenal when dealing with these tasks is to devote some of my attention to radio or audiobooks (preferably not in English as I find it hard to concentrate on two "streams" of English at the same time). I maintain sufficient attention to carry the task and don't lose concentration as fast. I'm wondering how others cope with these and maintain concentration.

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• How to get full stack traces logged when a JUnit test running in ant fails?

  - by Uri

  When a JUnit test throws a runtime exception while running in Eclipse, you can see the entire stack trace. Our build server uses ant and runs JUnit, but the printout on failure only provides the exception's message, not the entire "printStackTrace". Is there a convenient way to get this functionality?

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• Are there IDEs in which the code-completion widget is not a linear list?

  - by Uri

  Most mainstream IDEs use code-completion in the form of a linear list of suggestions (typically methods). Are there any IDEs (mainstream or not) or IDE plugins that use a non-linear widget, such as a tree? (e.g., pick category first, then the actual recommendation)? I'm working on an IDE feature and want to make sure I'm not reinventing the wheel or infringing some patent.

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• Is there a way to force JUnit to fail on ANY unchecked exception, even if swallowed

  - by Uri

  I am using JUnit to write some higher level tests for legacy code that does not have unit tests. Much of this code "swallows" a variety of unchecked exceptions like NullPointerExceptions (e.g., by just printing stack trace and returning null). Therefore the unit test can pass even through there is a cascade of disasters at various points in the lower level code. Is there any way to have a test fail on the first unchecked exception even if they are swallowed? The only alternative I can think of is to write a custom JUnit wrapper that redirects System.err and then analyzes the output for exceptions.

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• Which IDE / code editor was the first to introduce a code completion feature?

  - by Uri

  I am trying to identify the point in time where code completion (autocomplete/intellisense/whatever) was first introduced in IDEs and would appreciate any pointers. By code completion here I mean a feature within the editor that offers methods or suggestions based on the code that was already typed, and I am interested in programming language related completions (not word processor style completion).

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• CSS bug in text input field - MSIE7

  - by Uri Bruck

  I have an input text in a form that has a problem in MSIE7. When the text field is filled and I continue typing, the background starts scrolling left along with the text. This is the form when the text field is filled http://img155.imageshack.us/i/screen2rl.jpg/ The background image, a white rectangle with rounded corners, scrolls left with the text, leaving the black background. This is the CSS for this text field: border: none; background: url('/wp-content/themes/pokerbuddy/images/field.png') top left no-repeat; width: 100px; height: 20px; padding: 0px; font-size: 80%; color: #399; display:inline; Is there any way to solve this in MSIE7?

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• How to ensure consistency of enums in Java serialization?

  - by Uri

  When I serialize an object, I can use the serialVersionUID mechanism at the class level to ensure the compatibility of the two types. However, what happens when I serialize fields of enum values? Is there a way to ensure that the enum type has not been manipulated between serialization and deserialization? Suppose that I have an enum like OperationResult {SUCCESS, FAIL}, and a field called "result" in an object that is being serialized. How do I ensure, when the object is deserialized, that result is still correct even if someone maliciously reversed the two? (Suppose the enum is declared elsewhere as a static enum) I am wondering out of curiosity - I use jar-level authentication to prevent manipulation.

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• How to track downloads from an Eclipse update site?

  - by Uri

  I have a plug-in that I am distributing via an Eclipse update site. I want to track how many times it is being downloaded, and preferably by whom. For regular pages on my site, I can use Google analytics. However, Eclipse doesn't use any HTMLs when going for update sites. Is there any way to do this when I don't have access to the hosting apache?

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• What does it mean when a Perl method returns a "hashref"?

  - by Uri

  I'm trying to decrypt a Perl code which I'm not familiar with, somehow related to HashRef. I'm using Amazon::S3, but my question is a general Perl question. See the code below: use Amazon::S3; my $s3 = Amazon::S3->new( ... ); my $response = $s3->buckets; Documentation (here) sais, about s3-buckets: Returns undef on error, else HASHREF of results The following line is working for me, but I don't understand why: for $b in ( @ { $response->{buckets} } ) { print "bucket: " . $b->bucket . "\n"; } I'm Puzzled by each operator on the first line. What type exactly are $response, $respone->{bucket}. Looks like the expression within the for is an array, but I don't understand this syntax: @{ ... }?

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