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• determine if parity bit representation in MIPS

  - by Hristo

  Is there some instruction in MIPS that will determine the parity of a certain bit representation? I know to determine whether a "number" has an even parity or an odd parity is to XOR the individual bits of the binary representation together, but that seems computationally-intensive for a set of MIPS instructions... and I need to do this as quick as possible. Also, the number I'm working in is represented in Grey Code... just to throw that in there. So is there some pseudo-instruction in MIPS to determine the parity of a "number" or do I have to do it by hand? Thanks, Hristo

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• Websockify to wrap a forking server

  - by Gurjeet Singh

  I came across Websockify [1] and the accompanying Websock client-side javascript library. AIUI from the Wrap a Programsection in README, Websockify can help you launch a TCP server and rebind its port so that incoming Websockets-based communication is parsed and forwarded to the server on the proper (rebinded) port. My question is, can this mechanism be used to wrap a server that forks its children which in turn communicate with the client on a different port. Specifically, I am interested in websockifying a Postgres server, which typically listens on port 5432 and for a new incoming connection it forks a child which serves all future request from that client. (If it helps, Oracle RDBMS and many other servers, RDBMS or not, also use similar method.) [1] https://github.com/kanaka/websockify

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• I've only programmed in AS3; What's the easiest practice in Flash CS4 to create simple animations?

  - by Zando

  So I've been using Flash for awhile, but rarely ever use the authoring tool. I want to create a quick little slideshow in which a user clicks buttons, and assets on the screen fade in an out as you move from slide to slide. I don't want to do this programatically...what's the quickest route to go about doing this, with using some AS3 but primarily relying on CS4's authoring tools? I remember when I first learned flash, years ago, you placed elements on stage and stretched them out over multiple frames. That seems like a lot of work...I'd rather just have, say, 10 total frames, each frame being a step in the slideshow, and each click of the next button going to that next frame, with each frame having its own animations.

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• How do I make a shortcut for a Perl program under Windows using a DOS batch file?

  - by Micah

  I'm trying to "hide" some of my perl program from the end user to make things easier on them. I'm doing what I can to keep them out of the command prompt. The program itself has a GUI designed in Perl/Tk, so they don't have to worry about the command prompt. Could I write out a quick batch file that goes along the lines of: START perl 'C:\[some path here]\myscript.pl' with START to start a program, the perl interpretor as my program, and the path/name of my perl script as the parameter? Would I have to specify where to find perl or would Windows just know because perl is in the computer's PATH variable? Thanks for the help!

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• Remote debugging in Windows Embedded

  - by Ben Schoepke

  Hi, I'm moving from Windows CE 6 to Windows Embedded Standard 7 for a project and am wondering how remote debugging of .Net apps works with Windows Embedded target devices. In CE with VS2008 and ActiveSync (USB), I can hit F5 and my app is automatically deployed to the target device and executed so I can step through my breakpoints just like I would if I were debugging locally. Is there an equivalent remote debugging solution for Windows Embedded debugging? A quick glance through the Visual Studio "Remote Debugger" documentation makes the whole thing seem a lot clunkier/less integrated. Is there an easy way to debug applications on target devices running Windows Embedded like I would with CE? Thanks, Ben

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• Should strongly typed partial views on one page in asp.net mvc-2 have one combined view model?

  - by Kai

  Hi guys, I have a question about asp.net mvc-2 strongly typed partial views, and view models. I was just wondering if I can (or should) have two strongly typed partial views on one page, without implementing a whole new view model for that page. For example, I have a page that displays profiles, but also has an inline form to add a quick contact. Each of these entities already has it's own view model, i.e I have a ProfileViewModel and a ContactViewModel. So my view needs two strongly typed partial views, one using an IEnumerable List of ProfileViewModels, and one using a ContactViewModel. Is it possible or desirable to avoid making a third view model, an 'IndexViewModel' for this page, which holds a list of ProfileViewModels and a ContactViewModel? Is not implementing this view model bad practice, or tidier as it results in less view models? Thanks!

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• How to mock protected virtual members with Rhino.Mocks?

  - by Vadim

  Moq allows developers to mock protected members. I was looking for the same functionality in Rhino.Mocks but fail to find it. Here's an example from Moq Quick Start page how to mock protected method. // at the top of the test fixture using Moq.Protected() // in the test var mock = new Mock<CommandBase>(); mock.Protected() .Setup<int>("Execute") .Returns(5); // if you need argument matching, you MUST use ItExpr rather than It // planning on improving this for vNext mock.Protected() .Setup<string>("Execute", ItExpr.IsAny<string>()) .Returns(true); Let me know if I'm chasing something that doesn't exit.

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• Why Does the iPad Toolbar Refuse to Reappear When Orientation Changes?

  - by dugla

  I have a fullscreen OpenGL iPad app that behaves correctly for all orientation changes. I now want to add a UIToolbar programmatically and while it appears correctly in launch orientation - portrait in the Xcode simulator - it dissapears when the orientation changes to landscape. Change the orientation back to portrait and the Toolbar reapppears. Huh? - (void)loadView { NSLog(@"EAGL ViewController - load View"); CGRect frame = [[UIScreen mainScreen] applicationFrame]; EAGLView *eaglView = [[[EAGLView alloc] initWithFrame:frame] autorelease]; self.view = eaglView; [[NSBundle mainBundle] loadNibNamed:@"Toolbar" owner:self options:nil]; NSLog(@"%@", [[self.toolbar class] description]); [self.view addSubview:self.toolbar]; [self.view bringSubviewToFront:self.toolbar]; } What have I failed to do here? Thanks, Doug

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• Container Options in AWS Elastic Beanstalk

  - by Sangram Anand

  We have deployed a java webapplication in Elastic Beanstalk with the minimum instance count 1 and max instance count 2 for Autoscaling. The custom AMI we are using is c1.medium with Sun JDK 6. The environment status changed to yellow and then red. After checking into the log file from the snapshot logs we found a exception - Caused by: java.lang.OutOfMemoryError: Java heap space. Assuming this could be one of the possible reason for the Environment failure. The settings that we have configured in the Environment Container option are Initial JVM Heap Size (MB) - 256M Maximum JVM Heap Size (MB) - 512m The maximum heap size the java virtual machine will ever consume, specified on the JVM launch command line using -Xmx. Maximum JVM Permanent Generation Size (MB) - 512m Should i increase the Heap size from 512m to more or is it fine.

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• .NET Code Access Security: Useful or just overcomplicated?

  - by routeNpingme

  see also Is “Code Access Security” of any real world use? I want to get some other opinions on this... I like the idea of Code Access Security for desktop applications. But in the lifetime of .NET I have to admit I've never actually had a situation where CAS has actually blocked something to my benefit. I have, however, had many times where something as simple as sharing a quick .NET application across a mapped drive becomes an enterprise code access nightmare. Having to break out caspol.exe to create trusted path rules and having no clear way of knowing why something failed makes it seem like CAS adds way more frustration to the development and deployment process than it offers in security. I'd like to hear either some situations where CAS has actually helped more than hurt, or if there are other people out there frustrated with its current implementation and defaults.

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• NpgSQL insert file path containing backslashes "\\"

  - by Chau

  I am trying to create a record containing the path to a file. The insertion is done into a Postgres database where UTF8 is enabled, using the NpqSQL driver. My table definition: CREATE TABLE images ( id serial, file_location character varying NOT NULL ) My SQL statement (boiled down to a minimum): INSERT INTO images (file_location) VALUES (E'\\2010') When using pgAdmin to insert the above statement, it works fine. Using the NpgSQL driver through Visual Studio C#, it fails with this exception: "ERROR: 22021: invalid byte sequence for encoding \"UTF8\": 0x81" Replacing my SQL statement with the following: INSERT INTO images (file_location) VALUES (E'\\a2010') ^ The E is encouraged by pgAdmin when using double backslashes. So a quick recap: Why is NpqSQL stopping my insertion of the \\2010?

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• Recognizing when to use the mod operator

  - by Will

  I have a quick question about the mod operator. I know what it does; it calculates the remainder of a division. My question is, how can I identify a situation where I would need to use the mod operator? I know I can use the mod operator to see whether a number is even or odd and prime or composite, but that's about it. I don't often think in terms of remainders. I'm sure the mod operator is useful and I would like to learn to take advantage of it. I just have problems identifying where the mod operator is applicable. In various programming situations, it is difficult for me to see a problem and realize "hey! the remainder of division would work here!" Any tips or strategies? Thanks

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• [C#][Win32 API] PostMessage Help?

  - by Rudi

  I've looked at sites and MSDN documentation but I still don't understand the last parameter of PostMessage(). On forums in which people ask how to use PostMessage, people reply with one of two implementations: PostMessage(WindowHandle, WM_KEYDOWN, KeyCode, MapVirtualKey(KeyCode, 0) << 16); PostMessage(WindowHandle, WM_KEYDOWN, KeyCode, 0); What's the difference? Why can the last parameter be left as 0 in some instances, but has to be 'shifted' and all that in other instances? Just a quick question. Don't need essay replies (although they would be much appreciated). Any insight is appreciated. Thanks in advance.

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• How to automate disbursement of electronic payments from one bank account to 20,000 other bank accou

  - by Dylan West

  I am helping a startup business to launch and I will be building or finding a shopping cart software for its website. There will only be one product for sale, but anytime someone buys a product, I have to use customer information like their zipcode and which distributor they bought from to calculate commissions that will go to the different distributors. All the incoming money will be sent to one sort of escrow account for a few weeks, and after that few weeks is over, I need to be able to "throw the switch" and cause each of the 20,000 distributors to get their rightful share of that escrow account, depending on the data stored that reflects their sales activity and commissions due. Is this something I can write a script to handle? Better yet, is this something an inexpensive or open source solution can handle, or something that can be setup in something like Paypal? Or is a better approach to somehow create a webpage where each distributor can login to and see their commissions due and initiate the account transfer on their own, but the web app restrict them from transferring more than what they're due? Thanks

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• Making a shortcut for a Perl program under Windows using a DOS batch file.

  - by Micah

  I'm trying to "hide" some of my perl program from the end user to make things easier on them. I'm doing what I can to keep them out of the command prompt. The program itself has a GUI designed in Perl/Tk, so they don't have to worry about the command prompt. Could I write out a quick batch file that goes along the lines of: START perl 'C:\[some path here]\myscript.pl' with START to start a program, the perl interpretor as my program, and the path/name of my perl script as the parameter? Would I have to specify where to find perl or would Windows just know because perl is in the computer's PATH variable? Thanks for the help!

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• Python "Every Other Element" Idiom

  - by Matt Luongo

  Hey guys, I feel like I spend a lot of time writing code in Python, but not enough time creating Pythonic code. Recently I ran into a funny little problem that I thought might have an easy, idiomatic solution. Paraphrasing the original, I needed to collect every sequential pair in a list. For example, given the list [1,2,3,4,5,6], I wanted to compute [(1,2),(3,4),(5,6)]. I came up with a quick solution at the time that looked like translated Java. Revisiting the question, the best I could do was l = [1,2,3,4,5,6] [(l[2*x],l[2*x+1]) for x in range(len(l)/2)] which has the side effect of tossing out the last number in the case that the length isn't even. Is there a more idiomatic approach that I'm missing, or is this the best I'm going to get?

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• C# Class Library wont register for COM

  - by Jordan S

  Hello All, I am trying to gain access to a .NET class library in Microsoft Excel. To do this I know that the .NET class library must be registered with COM. So I tried going to my Assembly Info and Setting COM Visible to true. Then on the build tab I set Register for COM Interop for true also. I checked the AssemblyInfo.cs file and it does contain [assembly: ComVisible(true)]. But for some reason when I try to add a reference to the Class Lib in Excel the namespace does not show up in the list. I made a quick test Class library with nothing in it and did the same thing (set COM Vis = true , and Register For COM Interop = true) and that one does show up on the list of available references. I can't figure out what the difference is between the two classes. I am not sure if my class is actually being registered for COM interop or not. Does anyone know what I can do to fix this???

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• Resources to learn sh scripting 'just like a normal programming language'

  - by Homer J. Simpson

  Hi, what is the best resource (book would be nice) to learn sh scripting (the "standard" shell on Unix systems) just like when i would learn a "normal" programming/scripting language ? There are lots of tutorials on certain aspects of shell scripting, they mostly deal with shells in general and unix commands and so on, but i would rather like to find a more general approach - meaning a quick syntactic overview and an outlook on how to do things you normally do when programming, like implementing small algorithms and so on. Doing actual scripting, not just a structured batch file. And rather 100-liners than 1-to-3-liners. Can you recommend a good standard book on the topic ?

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• Distribute pre-compiled python extension module with distutils

  - by Toji

  Quick one today: I'm learning the in's and out's of Pythons distutils library, and I would like to include a python extension module (.pyd) with my package. I know of course that the recommended way is to have distutils compile the extension at the time the package is created, but this is a fairly complex extension spanning many source files and referencing several external libs so it's going to take some significant playing to get everything working right. In the meantime I have a known working build of the extension coming out of Visual Studio, and would like to use it in the installer as a temporary solution to allow me to focus on other issues. I can't specify it as a module, however, since those apparently must have an explicit .py extension. How could I indicate in my setup.py that I want to include a pre-compiled extension module? (Python 3.1, if it matters)

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• Is there a way to make a Google Web Toolkit (GWT) Button look like a HTML Hyperlink?

  - by Catfish

  I plan on appending some comments onto a text, to do that, first, I need the concerned text to act like a button for me to launch a popup, which in turn shows the comment. For that to happen, I need to make that concerned text to act like a button in GWT, but due to some aesthetic reasons I don't want it to look like a normal GWT Button, instead, I prefer it to look like any normal HTML hyper-link, which upon clicking it, acts exactly like a GWT Button which in turn showing the comment in the pop up. So is there a way to make a GWT Button appear more like a html hyper-link? Or, at the minimum, would it be possible to convert the concerned text to .JPG for it to be inserted into a Image Button in GWT?

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• Enable Session state in sharePoint 2010

  - by Albert D. Kallal

  I setup a test box computer with server 2008 (standard edition, not R2 and not hyper-v editing). I then installed SharePoint 2010. I was amazed how easy the whole setup went (the prerequisites setup on the SharePoint disk made this process oh so easy – great install system). Really this was just so easy. This test box is being used for testing Access web services. I am able to well publish access applications to this test server and Access applications publish and run just fine on the web SharePoint site through an web browser. However, the only thing that does not work is when I launch a Access report. The error message I get back is This report failed to load because session state is not turned on. Here is a screen shot: I can’t seem to find the setting anywhere to turn session state on. Any hints or links on how to enable session state in SharePoint 2010 would be most appreciated.

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• How to make it easy for users to install my software? Does the programming language matter?

  - by lala

  I'm a beginner to intermediate programmer and I've learned some java and C#. I want to start thinking about making some simple programs that I can release to the world. Just some basic stuff like calendar software that will probably be free. Users want the install process to be quick and easy. To install a java program, I have to tell them to have java installed. To install a C# program, I have to tell them to have .NET installed. I'm worried this might put off some potential users who just want to double click an exe file, choose a directory and be pretty much done. So, I guess this is an either/or two part question: 1) Is there a programming language that makes it easier to set up an installer without requiring users to have other stuff installed? or: 2) Is there some way to set up an installer that checks the system to see if it has java/.NET/whatever, and then includes java/.Net/whatever in the installation if it's not already there?

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• SQL 2008 SMO Database Status property memory leak.

  - by AKoran

  It appears there is a memory leak in the Status property of the SMO Database class. Using the code below with SQL 2005 SMO libraries works fine, but as soon as you use SQL 2008, the memory leak appears.... Any other good way of getting the database staus in SQL 2008? A quick example that magnifies the problem: private void button1_Click(object sender, RoutedEventArgs e) { for (int x = 0; x < 100; x++) { CheckStatus(); } } private void CheckStatus() { Server server = new Server("YourServer"); DatabaseCollection dbc = server.Databases; if (dbc.Contains("YourDatabase")) { DatabaseStatus dbStatus = dbc["YourDatabase"].Status; } }

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• Eclipse RCP application launcher not working properly in Arabic

  - by el_eduardo

  I have an RCP application which I build using the .product file and PDE. In my product file I create a binary launcher for different applications to provide convenience to the user. It all works fine except when testing in Arabic languages. In Arabic the application starts and it actually shows the Arabic characters that I mocked for testing but, it does not mirror. That said, if I invoke the launcher and pass the -nl switch launcher.exe -nl AR Then it mirrors. Also if I launch from the IDE with the target platform environment set to AR it mirrors too. I am shipping the bidi plugins for jface and swt (along with the NL plugins) and for the platform delta packs... Does anynone know what could be wrong with the laucher?

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• Build Procedure

  - by sarah xia

  Hi all, My company is putting auto build and deploy procedure in place. What we are doing now is checking out source code from svn and specify the source folder in Ant script. Is it the right way? Can we omit the exporting process and build directly from SVN? Another question is to do with versioning. At the moment, we are creating a tag whenever there is a release and then use the tag number to name the build product, which will be shipped to a client's site. I've done search on the Internet and here and it seems the correct way to name a product is like this: x.y.z.revision. However, our company is quite small and the client always want quick changes and releases. I would like to know what the drawbacks of only using tag number to name the product? And what would be the best approach for small companies like us? Thankyou, Sarah

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