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• C++ Macro Arithmetric

  - by anon

  I have to do with Macros (it's macros calling macros; so templates are out of the question). Here's what I want: foo(3, a, b1, c1) --> foo1(a, b1, c1); foo(5, a, b1, c1, b2, c2) -> foo2(a, b1, c1, b2, c2); foo(7, a, b1, c1, b2, c2, b3, c3) -> foo3(a, b1, c1, b2, c2, b3, c3); So basically, what I want is to be able to execute the "function" n - (n-1)/2 at macro expansion time. Is this possible? Thanks! [PS, if you dislike my questions; I support your right to downvote; my worst question so far is only -17, so maybe we can break that record; however, please let me know why my question is technically invalid.] Thanks EDIT: Foo takes a variable # of arguments, of the form: foo(N, a1, b1, a2, b2, ... a_N, b_N) -> foo##N(a1, b1, a2, b2, ... a_N, b_N);

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• Is False == 0 and True == 1 in Python an implementation detail or guaranteed by the language?

  - by EOL

  Is it guaranteed that False == 0 and True == 1, in Python? For instance, is it in any way guaranteed that the following code will always produce the same results, whatever the version of Python (existing and in the foreseeable future)? 0 == False # True 1 == True # True ['zero', 'one'][False] # is 'zero' Any reference to the official documentation would be much appreciated! Other comments would be appreciated too… :) Edit: As noted in many answers, bool inherits from int. The question can therefore be recast as: "Is this an implementation detail that might change in the future, or does the documentation officially say that programmers can rely on booleans inheriting from integers?". This question is relevant for writing robust code that won't fail because of implementation details! Edit 2: The original question is still open, I believe (even though I accepted what I thought was the closest answer): even though Python 3 officially recognizes booleans as integers, I have not yet seen any official integer values for False and True… It therefore looks to me like it is best to stay clear from the assumption that False==0 and True==1.

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• Find all radio groups which haven't been selected

  - by nickf

  I have a basic quiz/survey type application I'm working on, and I'd like to give the user a prompt before they submit if they haven't answered all the questions. All the questions are multiple choice using radio buttons: <div class="question"> Q1: What is the second letter of the alphabet? <div class="choices"> <input type="radio" name="question_1" value="1" /> A <input type="radio" name="question_1" value="2" /> B <input type="radio" name="question_1" value="3" /> C </div> </div> <div class="question"> Q2: Which out of these is a berry? <div class="choices"> <input type="radio" name="question_2" value="1" /> Apples <input type="radio" name="question_2" value="2" /> Bananas <input type="radio" name="question_2" value="3" /> Carrots </div> </div> <div class="question"> ...etc How do you find which groups haven't got an option ticked? Or at least, if there are any which haven't been answered? jQuery is ok, and even preferred.

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• is there a Java GUI for dummies ?

  - by MHero

  Hello, first I want to apologize about my english, it may be not clear enough. Well, I'm new to Java programming, and I search over this web about use of Swing, AWT, 2D, etc. but I didn't get the answer I was looking for. I want to know about a book or method to learn Java GUI programming (not even sure this is a propper term). Previous answers guide me to Filthy Rich Clients by Romain Guy and also to The Swing Tutorial in Sun Web Page. and No offense, but...the first one seems too complex and the second one a bit disorganize. so I ask about a more "for dummies" method. Thanks EDIT: Thanks everyboy, you're very kind and serious. I want to clear some things that I didn't state for being my first question. I dont' want to use autogenerated code(Don't want to say why only focus on my question for consistency) Also I've read Deitel & Deitel and it's a good beginners book but it seems to me that doesn't cover layout(and other details) Finally, I tried to read netbeans generated code but it's a mess find method by method and function by function the way that the IDE does it I hope this edition helps to solve my question

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• How to access parents' members from a inner class in WPF?

  - by black sensei

  Hello Experts! I'm trying to do scheduled operation let's say to check for user's credit left via web service call and update the user interface. i've tried with quartz.net to implement the scheduling bit.i created an inner class in the window class i need to update.That inner class has the method that calls the webservice and the result needs to be displayed back to the UI. here is an example of what i did. public partial class Window2 : Window { private int i; public Window2() { InitializeComponent(); } public class Myclass :IJob { public void Execute(JobExecutionContext context) { string result = doMyOperation(); //i'll like to call parent label member of name lblNotif //is something like parent.lblNotif.Content = result; //possible? } public string doMyOperation() { //calling the wermethod to retreive user's balance return result = service.GetUsersBalace(user); } } } Well the quartz bit is working and this post is not about quartz. here are my questions Question 1 : How is it possible to access Window2 controls, for instace lable lblNotif? Question 2 : If my thinking about this is wrong, what is done as best practice to solve my kind of problem, where an application need to do an operation let's say every 5mn and update the the UI. Question 3 : i at first tried to use the backgroundworker and i felt like i can't do the scheduling bit with it.Is that correct or i'm wrong. thanks for those who commented already and sorry for those who didn't get the meaning of my post.I hope this will be a bit clearer.Thanks for reading

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• Problem understanding Inheritance

  - by dhruvbird

  I've been racking my brains over inheritance for a while now, but am still not completely able to get around it. For example, the other day I was thinking about relating an Infallible Human and a Fallible Human. Let's first define the two: Infallible Human: A human that can never make a mistake. It's do_task() method will never throw an exception Fallible Human: A human that will occasionally make a mistakes. It's do_task() method may occasionally throw a ErrorProcessingRequest Exception The question was: IS an infallible human A fallible human OR IS a fallible human AN infallible human? The very nice answer I received was in the form of a question (I love these since it gives me rules to answer future questions I may have). "Can you pass an infallible human where a fallible human is expected OR can you pass a fallible human where an infallible human is expected?" It seems apparent that you can pass an infallible human where a fallible human is expected, but not the other way around. I guess that answered my question. However, it still feels funny saying "An infallible human is a fallible human". Does anyone else feel queasy when they say it? It almost feels as if speaking out inheritance trees is like reading out statements from propositional calculus in plain English (the if/then implication connectives don't mean the same as that in spoken English). Does anyone else feel the same?

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• Work with function references

  - by Ockonal

  Hello, I have another one question about functions reference. For example, I have such definition: typedef boost::function<bool (Entity &handle)> behaviorRef; std::map< std::string, ptr_vector<behaviorRef> > eventAssociation; The first question is: how to insert values into such map object? I tried: eventAssociation.insert(std::pair< std::string, ptr_vector<behaviorRef> >(eventType, ptr_vector<behaviorRef>(callback))); But the error: no matching function for call to ‘boost::ptr_vector<boost::function<bool(Entity&)> >::push_back(Entity::behaviorRef&)’ And I undersatnd it, but can't make workable code. The second question is how to call such functions? For example, I have one object of behaviorRef, how to call it with boost::bind with passing my own values?

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• Update table instantly or “Bulk” Update in database later? And is it advisable?

  - by Mestika

  Hi, I have a question regarding a semi-constant update in a database. In short it is regarding a checkout function on a web page, which each time the checkout function is evoked it do five steps. I want to try to optimize this function and have my eye on a step where I update a table each time the checkout is performed. I take the information retrieved from the shopping cart and then update the table in question. I do have some indexes on the table, the gain from those are greater than leaving them so this is a cost I’m willing to take. Now, my question is. Could it in some way regarding to performance be better to not update the table instantly but collect every checkout items and save them in some way (maybe in a file) and then at a specific time (or several times) at day take this file and then update the table with the new information. Then I started thinking about if there was a possibility to use some sort of Bulk Update to take a file, hashmap, array (or?) and then update it. And I’m using IBM DB2 version 9.7 Mestika

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• Passing huge amounts of data as an hexadecimal (0x123AB...) parameter of a clr stored procedure in s

  - by user193655

  I post this question has followup of This question, since the thread is not recieving more answers. I'm trying to understand if it is possible to pass as a parameter of a CLR stored procedure a large amount of data as "0x5352532F...". This is to avoid to send the data directly to the CLR stored procedure, instead of sending ti to a temporary DB field and from there passing it as varbinary(max) parmeter to the CLR stored procedure. I have a triple question: 1) is it possible, if yes how? Let's say i want to pass a pdf file to the CLR stored procedure (not the path, the full bits that make up the file). Something like: exec MyCLRStoredProcs.dbo.insertfile @file_remote_path ='c:\temp\test_file.txt' , @file_contents=0x4D5A90000300000004000.... --(this long list is the file content) where insertfile is a stored proc that writes to the server path (at file_remote_path) the binary data I pass as (file_contents). 2) is it there corruption risk of adopting this approach (or it is the same approach that sql server uses behind the scenes)? 3) how to convert the content of a file into the "0x23423..." hexadecimal representation

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• Make UIViewController outside Navigation Controller

  - by user1447316

  i have a question for you. I'm working on this app that has a walkthrough/tutorial screens and also login ones. On each of this screens there is a button to skip this part and go directly to use the app, without completing the registration (you know, so that people can test it before signing-in). As you can see i'm using Storyboards. The NowPlaying04 ViewController is actually the app itself. Obviously, when the user will be a registered one, i should also be able to jump right back to that screen, skipping the walkthrough and signin process. The first question is: how is the best way to structure this? The second quesion is: how i can make a ViewController outside that Navigation controller. Cause as you can see now, the NowPlaying04 ViewController inherits the top navigation bar. Which is a thing that i don't want. I don't need that. I hope that you have understood my question. I'll appreciate any help. Programmatically or by dragging stuff around, i'm ok with all the solutions. The important thing is that it works correctly! :-)

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• How to ask questions to an obstructionist?

  - by Rob Wells

  This is not related to my other recently posted question about "working with a star developer". In a similar vein, how do you work with someone who will only answer the specific question that you ask. I worked with someone who, when you asked a question on a specific aspect of the system, would give you the answer just related to the specific bit you'd asked about. For example, when processing radar messages I'd ask about an aspect of message number RJ546 and he would answer just about that specific part of RJ546. He wouldn't mention anything about the other freaky parts of the message, or mention any related aspects of the other messages. Then you'd go off and work on the processing and all of a sudden all this other freakiness would pop up. What's a good technique when working with this type of person? BTW I later found out that the person who I'd come in to replace had quit because he got sick and tired of having these surprises pop up due to the lack of information provided by this person. Edit: I forgot to add that the person was deliberately obstructionist and believed that job security came from hoarded knowledge not being disseminated.

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• Set all nonzero matrix elements to 1 (while keeping the others 0)

  - by Tomas Lycken

  I have a mesh grid defined as [X, Y, Z] = meshgrid(-100:100, -100:100, 25); % z will have more values later and two shapes (ovals, in this case): x_offset_1 = 40; x_offset_2 = -x_offset_1; o1 = ((X-x_offset_1).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); o2 = ((X-x_offset_2).^2./(2*Z).^2+Y.^2./Z.^2 <= 1); Now, I want to find all points that are nonzero in either oval. I tried union = o1+o2; but since I simply add them, the overlapping region will have a value of 2 instead of the desired 1. How can I set all nonzero entries in the matrix to 1, regardless of their previous value? (I tried normalized_union = union./union;, but then I end up with NaN in all 0 elements because I'm dividing by zero...) Follow-up question: I got a perfect answer to my original question, but now I have a follow-up question on the same problem. I'm going to define a filled disc, c = (X.^2+Y.^2<R^2) that will also overlap with the two ovals. How do I find all the points that are inside the circle, but not inside any of the ovals?

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• How to learn a new programming language? And how to choose the appropriate language?

  - by Sebi

  Unfortunately my last question was closed, so I reformulated the question: I know this question was here a lot of times and can't be answered at all, but im not looking for a single name, but rather for an advice in my situation. I learned programming with Java and now I'm developing in Java for more or less 5 years (at the university) and I thinks my programming skills their are really ok/average. I have also small experience in C/C++ and C#. Now I have some spare time and I'd like to learn a new language or deepen the knowledge of Java/C/C++. But how to choose the right language to learn? I'd like to learn a language which will be usefull in the future concerning working in a software development business? I know there is no single answer, but I'm sure you could mention some languages that are more usefull than others. And what's the best way to learn such a language efficiently (bearing in mind that one has already learned some other languages)? Just doing tutorials? Or trying to implement a project? Trying to move a Java project to the new language?

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• Radiobutton validation.

  - by _sh

  The question is on the client side validation using java script. Significant parts of the program related to the question are given below.. ... <form name="results" action="" method="post"> ... <input type="radio" name="id" value="<%= id_edit %>" /> <!-- Don't bother about id_edit --> .... <input type="button" name="Edit" value="Edit" onclick="invoke(0)"><input type="button" name="Delete" value="Delete" onclick="return invoke(1)"> .... The script, function invoke(btn) { if(btn == 0) document.results.action="gev.do"; if(btn == 1) document.results.action="del.do"; document.results.submit(); } What basically i do is, depending on the selection of button, i pass a value to the servlet, either for updation or deletion. My question is, how can i validate the radiobutton, ie, i can any one help me out writing the js to validate if any one of the radio button is selected. All my efforts are in vein and i now use server side validation.

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• STL in C++ how does it work

  - by helloWorld

  I have very technical question, I was working with C, and now I'm studying C++, if I have for example this class class Team { private: list<Player> listOfPlayers; public: void addPlayer(string firstName, string lastName, int id) { Player newPlayer(string firstName, string lastName, int id); listOfPlayers.push_back(Player(string firstName, string lastName, int id)); } } this is a declaration of the Player: class Player{ private: string strLastName; string strFirstName; int nID; public: Player(string firstName, string lastName, int id); } and this is my constructor of Player: Player::Player(string firstName, string lastName, int id){ nId = id; string strFirstName = firstName; string strLastName = lastName; } so my question is when I call function addPlayer what exactly is going on with program, in my constructor of Account do I need to allocate new memory for new Account(cause in C I always use malloc) for strFirstName and strLastName, or constructor of string of Account and STL do it without me, thanks in advance (if you don't want to answer my question please at least give me some link with information) thanks in advance

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• Ping bind errors in Operations Manager 2007

  - by Andrew Rice

  I am having an issue in SCOM 2007 R2. I am routinely getting the following errors: Failed to ping or bind to the RID Master FSMO role holder. The default gateway is not pingable. Failed to ping or bind to the Infrastructure Master FSMO role holder. The default gateway is not pingable. Failed to ping or bind to the Domain Naming Master FSMO role holder. The default gateway is not pingable. Failed to ping of bind to the Schema Master FSMO role holder. The default gateway is not pingable. The weird thing about these errors if I log into the server in question or if I log in to the SCOM server I can ping everything just fine. To top it all off the server in question is the role holder for 2 of the roles it is complaining about (RID and Infrastructure). Any thoughts as to what might be going on?

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• VMWare Server 2 Install is Failing w/ Error 25032: "failed to customize windows logon process"

  - by Justin Searls

  VMWare Server 2 install question here.* Straightforward question that would probably require a VMWare expert to pull apart, given that Google has been totally worthless on this. On a patched Windows XP machine, any attempt to install VMWare Server 2.0.1 results in failure, just prior to completion (progress bar is full but I can tell network adapter stuff hasn't been fired yet and most of the services haven't been instaled). The error: Error 25032. Failed to customize Windows logon process (). Please contact your administrator. Upon dismissing the error, you're treated to: Warning 25033. Failed to remove Windows logon customization (VMGINA.DLL). Please contact your administrator. Clicking "OK" rolls back your installation. Killing the installer and hoping that it somehow leaves a working install behind was also unproductive. *I hope install troubleshooting isn't outside the purview of serverfault, I'm typically an SO user.

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• MS Access Premiere Products Exercise

  - by rynwtts

  I am working with Microsoft Access, Premiere Products Exercises for a college course. I can't seem to get past a specific question. We are working with DBDL and E-R Diagrams. The question is here. Indicate the changes you need to make to the design of the Premiere Products database to support the following situation. A customer is not necessarily represented by a single sales rep but can be represented by several sales reps. when a customer places an order, the sales rep who gets the commission on the order must be one of the collection of sales reps who represents the customer. In the database already each customer is represented by a sales rep. Which yields a one to one relationship. I need to enable a customer to have several sales reps, and make it so that only those sales rep will be eligible for commission upon each order.

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• Backup Exec job completed with exceptions: RWS_AttachToDLE

  - by HannesFostie

  2 of this weekend's jobs completed with exceptions, and mention "RWS_AttachToDLE". I get the feeling the job did in fact complete without missing data, but I would like to be 100% sure (and can't verify the backup myself right now - colleague is out of the office and the backup in question is a bit of a black box for me, it works but I am not familiar with its inner workings). Also, how can I prevent this from happening? Google didn't prove to be very helpful, and experts exchange seem to have changed their system so that you can't simply scroll down to see the answers to a particular question ;-)

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• Networking with Windows 7

  - by Alix Axel

  I got several computers connected to my home wireless network and I want to make use of some of the features of Windows 7 for home networks but I can't seem to get them working: How do I keep files and folders in sync between specific computers? I'm not talking about Live Sync. How can I stream to Windows Media Player from another computer? I would appreciate if someone could provide me some links / solutions that address my needs. Thanks! To anyone who thinks this question is a duplicate and wants to close it please bare in mind the following: I'm not looking for additional software, I know I can use Live Sync, Dropbox and so on but I'm asking this: how do I configure Windows 7 to sync files between my home network - no Internet required! This has something to do with shared folders and offline files in Windows 7, but I can't get it to work. PS: Please merge with this question: http://superuser.com/questions/139763/networking-with-windows-7

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• Disable work offline in Internet Explorer 8

  - by Roberto Liffredo

  I am using Windows 7, and IE8. Every time I have GMail open in IE8, and I resume from sleep, I get the question about working offline - even if at that momoent the wireless connection is available. This is particularly sad, because all browsing is stopped until I dismiss that dialog, that may be hidden below other windows. As I am not using offline browsing at all, is it possible to disable the functionality altogether, so that I no longer get the question? A bit like in Firefox, where I simply get the error message with page unavailable. I have googled a bit, but no luck so far. Even a direct modification of the registry would be fine, for me.

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• How to add a local file to trusted zone in IE8?

  - by Raghu Dodda

  I want to add a file on my local drive (C:\something.html) to the Trusted Zone in IE8 (my OS is Windows Server 2003). The Add Sites Dialog box, does not seem to take entries for files on the local drive. I have tried: file://C:\something.html file:\\localhost\c$\something.html I have seen other solutions (on superuser and elsewhere) such Mark of Web, that allow your local file to be treated as if it were part of the internet zone, but I want to add my file to the Trusted Zone. How can I do this? Thanks.

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• PSExec on Windows 2008 R2 Failing "Network name cannot be found"

  - by Adam Frisby

  Hi, We've got a bunch of remote admin scripts which rely on psexec and they do not appear to be working over the network on our new 2008 hosts. An error dump is below: C:\Users\<user>\Desktop\PsTools> psexec \\<host IP> -u Administrator -p <pass> <cmd> PsExec v1.97 - Execute processes remotely Copyright (C) 2001-2009 Mark Russinovich Sysinternals - www.sysinternals.com Couldn't access <host IP>: The network name cannot be found. Make sure that the default admin$ share is enabled on <host IP>. We've tried both the machine name and the IP address in with the same results. The same command has worked previously with our Win2K3 hosts - so we're presuming it is some form of security change between the 2003 and 2008R2. Anyone have any clues?

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• vpnc Not Adding Internal DNS Servers to resolv.conf

  - by AJ

  I'm trying to setup vpnc on Ubuntu. When I run vpnc, my resolv.conf file does not get changed. It still only contains my ISP's name servers: #@VPNC_GENERATED@ -- this file is generated by vpnc # and will be overwritten by vpnc # as long as the above mark is intact nameserver 65.32.5.111 nameserver 65.32.5.112 Here is my /etc/network/interfaces: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.1.3 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 65.32.5.111 65.32.5.112 Any tips on how to troubleshoot/resolve this? Thanks in advance.

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• Problem making system calls with PHP scripts

  - by mazin k.

  I have the following PHP script: <?php $fortune = `fortune`; echo $fortune; ?> but the output is simply blank (no visible errors thrown). However, if I run php -a, it works: php > echo `fortune`; Be careful of reading health books, you might die of a misprint. -- Mark Twain php > Am I missing a config directive or something that would cause this? Edit: So, I tried running my script using $ php-cgi fortunetest.php and it worked as expected. Maybe the issue is with Apache2?

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