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  • Newbie programmer looking for a fun, small project (pref. C++/Python)

    - by Francisco P.
    Hello everyone, I have some experience in Scheme and C++ (read: a semester of each) I know the very basics of Python (used it for physics simulations with the Visual Python module). Can you recommend me some fun and small (i.e. don't take much time) projects on either Python or C++? I have no real preferences, just that it is fun :P Thanks for your time! PS: I've tried projecteuler and python challenge. Euler is good, but more about math than coding, and py challenge just didn't work for me.

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  • Can this code cause a memory leak (Arduino)

    - by tbraun89
    I have a arduino project and I created this struct: struct Project { boolean status; String name; struct Project* nextProject; }; In my application I parse some data and create Project objects. To have them in a list there is a pointer to the nextProject in each Project object expect the last. This is the code where I add new projects: void RssParser::addProject(boolean tempProjectStatus, String tempData) { if (!startProject) { startProject = true; firstProject.status = tempProjectStatus; firstProject.name = tempData; firstProject.nextProject = NULL; ptrToLastProject = &firstProject; } else { ptrToLastProject->nextProject = new Project(); ptrToLastProject->nextProject->status = tempProjectStatus; ptrToLastProject->nextProject->name = tempData; ptrToLastProject->nextProject->nextProject = NULL; ptrToLastProject = ptrToLastProject->nextProject; } } firstProject is an private instance variable and defined in the header file like this: Project firstProject; So if there actually no project was added, I use firstProject, to add a new one, if firstProject is set I use the nextProject pointer. Also I have a reset() method that deletes the pointer to the projects: void RssParser::reset() { delete ptrToLastProject; delete firstProject.nextProject; startProject = false; } After each parsing run I call reset() the problem is that the memory used is not released. If I comment out the addProject method there are no issues with my memory. Someone can tell me what could cause the memory leak?

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  • "Exception in thread "main" java.lang.NoSuchMethodError Do i miss library in the installed JDk?

    - by Ahmad
    Hello every body I was using the JDK very well writing the code then i use "javac" to compile it then "java" to run it But Recently when i write a code and compile it then if i try to run it this exception appears to me "Exception in thread "main" java.lang.NoSuchMethodError " at first i thought there is something wrong in my code , i searched in the internet for a solving for this problem but i didn't find anything may help me Then i try to run the "HelloWorld" example i made it before, it runs i copied the code and pasted it in another file and changed the name to "HelloWorld2" and compile it by "javac" and tried to run it by "java" the same exception appears i was surprised why? it is the same code then i used the "javap" which decompile the code with both i found this difference in the first one (the old one) "public static void main(java.lang.String[])"; but in the second (the new one) "public static void main(String[])"; without java.lang then i compiled the old one which works and runs by "javac" and when i try to run it, it didn't run and give me the same exception i tried with some of my old codes it run and when i compile it by "javac" it doesn't work I searched to find a solution to this problem and i found nothing

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  • How can I build a generic dataset-handling Perl library?

    - by Pep.
    Hello, I want to build a generic Perl module for handling and analysing biomedical character separated datasets and which can, most certain, be used on any kind of datasets that contain a mixture of categorical (A,B,C,..) and continuous (1.2,3,881..) and identifier (XXX1,XXX2...). The plan is to have people initialize the module and then use some arguments to point to the data file(s), the place were the analysis reports should be placed and the structure of the data. By structure of data I mean which variable is in which place and its name/type. And this is where I need some enlightenment. I am baffled how to do this in a clean way. Obviously, having people create a simple schema file, be it XML or some other format would be the cleanest but maybe not all people enjoy doing something like this. The solutions I can think of are: Create a configuration file in XML or similar and with a prespecified format. Pass the information during initialization of the module. Use the first row of the data as headers and try to guess types (ouch) Surely there must be a "canonical" way of doing this that is also usable and efficient. Thanks p.

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  • Best way to implement plugin framework - are DLLs the only way (C/C++ project)?

    - by Microkernel
    Introduction: I am currently developing a document classifier software in C/C++ and I will be using Naive-Bayesian model for classification. But I wanted the users to use any algorithm that they want(or I want in the future), hence I went to separate the algorithm part in the architecture as a plugin that will be attached to the main app @ app start-up. Hence any user can write his own algorithm as a plugin and use it with my app. Problem Statement: The way I am intending to develop this is to have each of the algorithms that user wants to use to be made into a DLL file and put into a specific directory. And at the start, my app will search for all the DLLs in that directory and load them. My Questions: (1) What if a malicious code is made as a DLL (and that will have same functions mandated by plugin framework) and put into my plugins directory? In that case, my app will think that its a plugin and picks it and calls its functions, so the malicious code can easily bring down my entire app down (In the worst case could make my app as a malicious code launcher!!!). (2) Is using DLLs the only way available to implement plugin design pattern? (Not only for the fear of malicious plugin, but its a generic question out of curiosity :) ) (3) I think a lot of softwares are written with plugin model for extendability, if so, how do they defend against such attacks? (4) In general what do you think about my decision to use plugin model for extendability (do you think I should look at any other alternatives?) Thank you -MicroKernel :)

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  • Batch-Remove Specific Text from Photo Descriptions

    - by David
    I've recently upgraded to iPhoto '11 (couldn't resist the pricing on the new app store) and as I'm adding more meta-data to my library and generally organizing things (places, faces, etc... I hadn't upgraded since '08) I've noticed something odd in my photos. Every photo in my library has a description (though many are short), but it would appear that somehow the description of one of the photos has been appended to many. I don't know if maybe I accidentally screwed up a batch change at some point in the past, or if the library upgrade somehow messed up, or what else may have happened. But what I need to do is fix these somehow. Now, manually editing is something of a daunting task. Within a library of 21,248 photos, 18,858 of them have this additional text. The one thing I do have going for me is that it's a specific string. If there's a way to "remove this string from everywhere in the library without removing the rest of any given description" then that would be perfect. Is there anything I can do like this? Maybe even manually editing a library file in a text editor? (Would that break anything else in iPhoto if its library was edited outside of the application, even while it's not running?) Does anybody have any ideas?

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  • How do I add a WSDL to a Visual Studio 2005 project?

    - by Ben McCormack
    One of our vendors provides a web service API to allow their customers to validate data in a database. As part of their SDK, they provide a WSDL (Web Service Definition Language) file that, according to their documentation, can "be read by software applications and application development tools. An application tool such as Microsoft's Visual Studio can import a WSDL document and automatically generate software classes that access the Web Services the WSDL defines." I'm currently using Visual Studio 2005. What do I need to do to get Visual Studio to do the magic code generation for me?

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  • python imaging library draw text new line how to?

    - by joven
    i have a word that will be putted on a image but the problem is that the word continues even though the word exceeds the width of the image is there anyway that the word shift's down if the word exceeds the width of the image or on a certain point the word shift's down if it exceeds the given point

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  • Why maven requires so many options to create a hello world project,can you recommend a more dedicate

    - by user198729
    Quoted from here: mvn archetype:generate -DgroupId=org.sonatype.mavenbook.simple \ -DartifactId=simple \ -DpackageName=org.sonatype.mavenbook \ -Dversion=1.0-SNAPSHOT And I also have to specify an archetype number... It seems that maven isn't satisfied to be just a Java build tool,but want to control all aspect of developing... Can someone recommend a really dedicated build tool for Java?

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  • How would you go to "design" a cart within a Zend Framework project?

    - by ÉricP
    Hi, I know ZF well, and a little bit of Magento, but I'm new to E-commerce, and I'm sure there are best practice to follow when designing a cart model. How would go to design a cart? I though of two models, Model_Cart and Model_Cart_Item used in conjonction with Zend_Session to store the cart in session. What are your feedbacks? How would you go to do that? What should I know about writing a cart system? Note that I need a simple system, I even don't need to work with quantity

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  • Creating Thumbnails in Build Phase of iPhone App Xcode project?

    - by nephilite
    Hey All, I have a group of png files in my bundle; but I also want smaller versions of them to be used at my app as well. Right now I am just resizing them all manually and putting them in the bundle as well: so i might have Graphic_1.png and Graphic_1-thumbnail.png. Instead, is there anyway to do something like: at build time, take all my png assets and create 1/4 scale versions of them, and save them into the bundle as well, with the -thumbnail in the filename as above? Thanks!

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  • Can I have the gcc linker create a static libary?

    - by Lucas Meijer
    I have a library consisting of some 300 c++ files. The program that consumes the library does not want to dynamically link to it. (For various reasons, but the best one is that some of the supported platforms do not support dynamic linking) Then I use g++ and ar to create a static library (.a), this file contains all symbols of all those files, including ones that the library doesn't want to export. I suspect linking the consuming program with this library takes an unnecessary long time, as all the .o files inside the .a still need to have their references resolved, and the linker has more symbols to process. When creating a dynamic library (.dylib / .so) you can actually use a linker, which can resolve all intra-lib symbols, and export only those that the library wants to export. The result however can only be "linked" into the consuming program at runtime. I would like to somehow get the benefits of dynamic linking, but use a static library. If my google searches are correct in thinking this is indeed not possible, I would love to understand why this is not possible, as it seems like something that many c and c++ programs could benefit from.

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  • How to find out or where to specify path of the JavaEE project?

    - by Milan
    I develop Java EEapplication and I have to create some files in the src folder in the my application. But I dont where or how to specify the path. I want my application to be portable. It means just to say TestProject/src/.... and not C:/bla/bla/TestProject/src/... do we specify this in some app file like web.inf, meta-inf or its just some trick. Thanks!

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  • What's the best graphics library for node.js for image cropping?

    - by Travis
    I'm creating a website using node.js. I have seen many libraries mentioned that piggy back on top of imagemagick etc. There is a list here: https://github.com/ry/node/wiki/modules#graphics What I'm trying to do is take the image that a user uploads, crop it/size it to certain dimensions the site requires. What is the best/most active script to do this? I'd like one with npm support. Does anyone have actual experience using some of these?

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  • Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail

    - by Nosredna
    What would be a good way to attempt to load the hosted jQuery at Google (or other Google hosted libs), but load my copy of jQuery if the Google attempt fails? I'm not saying Google is flaky. There are cases where the Google copy is blocked (apparently in Iran, for instance). Would I set up a timer and check for the jQuery object? What would be the danger of both copies coming through? Not really looking for answers like "just use the Google one" or "just use your own." I understand those arguments. I also understand that the user is likely to have the Google version cached. I'm thinking about fallbacks for the cloud in general. Edit: This part added... Since Google suggests using google.load to load the ajax libraries, and it performs a callback when done, I'm wondering if that's the key to serializing this problem. I know it sounds a bit crazy. I'm just trying to figure out if it can be done in a reliable way or not. Update: jQuery now hosted on Microsoft's CDN. http://www.asp.net/ajax/cdn/

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  • is PHP itself transforming into a framework or big library?

    - by Elzo Valugi
    At the beginning PHP was a scripting language. But after the introduction and improvement of OOP I see more and more objects added to the core. They started with SPL which grew a lot, now we have DOMDocument family, DateTime family which should be part of PECL, Pear or Zend Framework or implemented by each one of us. Shouldn't be php only for build-in functions and all these objects passed to something else? Example. DateTime class is part of the core and I see it very similar with Zend_Date.

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  • Does program need additional symbols from .so shared library except those declared in header file?

    - by solotim
    In C programming, I thought that a object file can be successfully linked with a .so file as long as the .so file offers all symbols which have been declared in the header file. Suppose I have foo.c, bar.h and two libraries libbar.so.1 and libbar.so.2. The implementation of libbar.so.1 and libbar.so.2 is totally different, but I think it's OK as long as they both offers functions declared in bar.h. I linked foo.o with libbar.so.1 and produced an executable: foo.bin. This executable worked when libbar.so.1 is in LD_LIBRARY_PATH.(of course a symbolic link is made as libbar.so) However, when I change the symbolic link to libbar.so.2, foo.bin could not run and complainted this: undefined symbol: _ZSt4cerr I found this symbol type is 'B' and it does not appear in libbar.so.2. Obviously this symbol has nothing to do with those functions I decared in bar.h. What's wrong here?

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