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  • Dangers of the pyton eval() statement

    - by LukeP
    I am creating a game. Specifically it is a pokemon battle simulator. I have an sqlite database of moves in which a row looks something like: name | type | Power | Accuracy | PP | Description However, there are some special moves. For said special moves, their damage (and other attributes not shown above, like status effects) may be dependant on certian factors. Rather than create a huge if/else in one of my classes covering the formulas for every one of these moves. I'd rather include another column in the DB that contains a formula in string form, like 'self.health/2'(simplified example). I could then just plug that into eval. I always see people saying to stay away from eval, but from what I can tell, this would be considered an acceptable use, as the dangers of eval only come into play when accepting user input. Am I correct in this assumption, or is there somthing i'm not seeing.

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  • With PHP and AJAX, Can two clients inter-exchange data without MySQL?

    - by Devyn
    Hi, Let's assume I'm developing a AJAX, PHP chess game. During the game, one movement of a player will be notified to the another but we are not saving that information. Normally, we used to store in MySQL every time a player makes movement and show update position to another player. What I want is to reduce MySQL load as much as possible and server is not interested in movements between two players. Server will only save final result like who wins. So what should I do?

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  • Modifying object in AfterInsert / AfterUpdate

    - by Jean Barmash
    I have a domain object that holds results of a calculation based on parameters that are properties of the same domain object. I'd like to make sure that any time parameters get changed by the user, it recalculates and gets saved properly into the database. I am trying to do that with afterInsert (to make sure calculation is correct in the first place), and afterUpdate. However, since my calculation is trying to modify the object itself, it's not working - throwing various hibernate exceptions. I tried to put the afterUpdate code into a transaction, but that didn't help. I am afraid I am getting into a circular dependency issues here. The exception I am getting right now is: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [esc.scorecard.PropertyScorecard#27] Are the GORM events designed for simpler use cases? I am tempted to conclude that modifying the object you are in the middle of saving is not the way to go.

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  • How to save derived type (TPT) in Entity Framework?

    - by Peter Stegnar
    I have problems with saving derived type (TPT) with Entity Framework to database. Let's say I have base entity Animal and derived type Dog. I want to save Dog entity. I thought that I could do it like contex.AddToDogs(), but contex contain only base entity - Animal. So I can only save Animal object - contex.AddToAnimals(). I have also tried with contex.AddObject("Animals", dogInstance), but I get the following error: The member with identity 'NavigationProperty' does not exist in the metadata collection. But I have add EntityReference to the "NavigationProperty". So how to save derived type in EF?

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  • Can the onborad LAN cause computer shutdown

    - by user1146320
    I have P4 processor with nvidia card. Now if i don't connect to internet then my computer stays on for as much i can like 4-5 days. But if i plug in the ethernet wire. Do some surfing and leave computer as it is. Then computer fails. I mean The display on screen gets off Looks like something stopping the power supply to Harddisk. But motherboard stays on , FAN is still running , i can eject CD drive as well. But no display on monitor. I have to turn off and then turn on again. I tried formatting windows XP but again same problem

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  • How to create an iPad directory view like animation?

    - by mahes25
    In the recent iOS 4.2 update, Apple introduced a nice animation for creating one level directories. I am trying to figure out how to implement a similar animation in my project. I would deeply appreciate it if anyone could give me any pointers to do this efficiently. From my investigation, I believe this animation or effect could be done very efficiently using Core Image which would allow me to write a custom filter. Unfortunately, Core Image is not available in iPhone. So how can do it? I read a blog post that explained a core animation scheme to create an iPad flip clock. The problem I have is similar but has important differences. Besides, I not excited about saving the subimage combinations, which I believe can cause a memory issue. Please enlighten me on the possible ways of doing this animation. I am relatively new to iOS programming, so I might have missed obvious ways of doing this animation or effect.

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  • Computer refuses to POST

    - by TheX
    Computer refuses to POST. What it will do is the fan spins up, and the lights come on on the motherboard, but other then that it just sits there and laughs in my face! Here is what I have done... I have tried 2 different video cards, both known to work, 4 different sticks of RAM in all four ram slots, 2 processors (known to work), and 2 power supplies (known to work). The only constant is the motherboard... The Motherboard is a Asus m3a3-mvp deluxe. Anyone have any other ideas? Also, I have bread boarded it to make sure there where no shorts (taken everything out of the case and tried again).

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  • Win Server 2008 R2 - Mapped shared folder hanging?

    - by M-Tech
    I have recently built a windows 2008 server R2 machine. This is purely for file server purposes and is very much a basic build. All windows updates installed and part of domain. I have setup a shared folder on the C:Drive and added permissions for domain users as co-owners. The client machines run XP SP3 and are part of the domain also. We have a few servers running the same setups on a few of our sites but this one is particular crashes users machines (explorer.exe hangs for at least a few mins) when attempting to access the shared folder. I have turned off the option on the network card for power save aswell still no change. Any help with this is very much appreciated and i look forward to hearing from you ;)

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  • Using typedefs (or #defines) on built in types - any sensible reason?

    - by jb
    Well I'm doing some Java - C integration, and throught C library werid type mappings are used (theres more of them;)): #define CHAR char /* 8 bit signed int */ #define SHORT short /* 16 bit signed int */ #define INT int /* "natural" length signed int */ #define LONG long /* 32 bit signed int */ typedef unsigned char BYTE; /* 8 bit unsigned int */ typedef unsigned char UCHAR; /* 8 bit unsigned int */ typedef unsigned short USHORT; /* 16 bit unsigned int */ typedef unsigned int UINT; /* "natural" length unsigned int*/ Is there any legitimate reason not to use them? It's not like char is going to be redefined anytime soon. I can think of: Writing platform/compiler portable code (size of type is underspecified in C/C++) Saving space and time on embedded systems - if you loop over array shorter than 255 on 8bit microprocessor writing: for(uint8_t ii = 0; ii < len; ii++) will give meaureable speedup.

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  • JSF - database character encoding

    - by wheelie
    Hi there, I have a Java Web application using GlassFish 3, JSF2.0 (facelets) and JPA (EclipseLink). The problem I'm facing, is that if I'm saving entities to the database with the update() method, String data loses integrity; '?' is shown instead of some characters. The server, pages and database is/are configured to use UTF-8. After I post form data, the next page shows the data correctly. Furthermore it "seems" in debug that the String property of the current entity stores the correct value too. Dunno if NetBeans debug can be trusted; might be that it decodes correctly, however it's incorrect. Any help would be appreciated, thanks in advance! Daniel

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  • Prioritize file sharing performance in Windows Server 2008

    - by cmbrnt
    I've got a server running Windows Server 2008, and use it mainly for sharing files throughout the domain from a number of disks. It's running on VMware ESXi 4.0, in case that matters. My problem is that when I log in to the server to check user permissions etc, the access speed the files on the remote disks almost grinds to a halt. I havn't been able to measure the speeds, but I would guess it slows down to about 100kB/s as soon as I log in. This is on a gigabit network and the problems are equal for all users, even the ones connected to the same switch as the server. I've assigned 2 GB RAM to the server, and reserved it 1,5Ghz processor power. I don't have to do anything special on the server for this halt to occur. How can I make sure file sharing is prioritized on the server, so no matter what applications I'm using it will always make sure file sharing works properly? Could this be a VMware issue?

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  • Is there a software like AutoCAD, but only 2D, not 3D?

    - by Saeed Neamati
    I love AutuCAD. It's powerful, easy to use, and fits engineering mind. It rocks when you want to draw 2D diagrams and shapes and one the cool features I like about it, is its snapping power. You draw a simple rectangle, then you can very easily create a circumscribe circle around it. However, new version of it are becoming really heavy (in size) and need high tech hardware, because of its powerful 3D capabilities, and rendering engines coming with it. I only want the 2D part of AutoCAD. Is there any software out there, which resembles AutoCAD (like having a console, where you can type L and get the line tool, or having snapping capability, etc.), but is small in size? In other words, what software can be named as AutoCAD 2D alternative?

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  • Inheritance - initialization problem

    - by dumbquestion
    I have a c++ class derived from a base class in a framework. The derived class doesn't have any data members because I need it to be freely convertible into a base class and back - the framework is responsible for loading and saving the objects and I can't change it. My derived class just has functions for accessing the data. But there are a couple of places where I need to store some temporary local variables to speed up access to data in the base class. mydata* MyClass::getData() { if ( !m_mydata ) { // set to NULL in the constructor m_mydata = some_long_and complex_operation_to_get_the_data_in_the_base() } return m_mydata; } The problem is if I just access the object by casting the base class pointer returned from the framework to MyClass* the ctor for MyClass is never called and m_mydata is junk. Is there a way of only initializing the m_mydata pointer once?

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  • My Mac Book Pro is turning itself, on my bagpack

    - by J. Pablo Fernández
    This happens to me twice: I press the power button on my Mac Book Pro, I choose sleep, I close it, I unplug everything, I confirm that is off (by pressing my ear to it) and put it in my back. Some minutes latter it wakes up by itself. Both times I caught it in time, well, the second time it was so hot I couldn't touch some parts and it was refusing to actually wake up, the screen was blank. Restarting it worked though. Any ideas what might be going on and/or how to prevent this?

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  • Best approach to store login credentials for website

    - by Zerotoinfinite
    I have created a site in ASP.NET 3.5 & I have only 2 or 3 user login IDs who can login to the website. What would be the best way to save these login details? Which of these approaches, or others, would be most suitable? Using Forms Authentication, and saving credentials (username and password) in web.config to create a text file in directory and modify it Which approach is best from a security and maintenance perspective? What other approaches are suitable for a login system for ASP.NET?

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  • Setting up VMWare ESXi 5 with a single physical NIC

    - by deed02392
    I have a cheap but powerful dedicated server I am leasing with OVH, because they were recently having a promotion. I would like to try and manage all this power by playing with VMs using ESXi. However I am only provided with a single NIC. I had thought this would be easy to get around since, at home I have a single NIC which is my broadband modem, and yet a simple NAT gateway device happily provides internet access to all my devices. I am struggling to implement this on ESXi, though. Can anyone advise on how I could go about having ESXi and multiple VMs working with just one NIC? Here's my current setup: I believe all I need is to be able to configure NAT from the NIC to all the VMs etc.. How would I set up and administer this kind of infrastructure?

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  • What is the fastest way to get the persisted object after calling Hibernate's saveOrUpdate?

    - by Dave
    I'm using Hibernate 3.2.1.ga, hibernate annotations 3.2.1.ga, and hibernate-jpa-2.0-api. I can't upgrade at this time as I'm working with legacy code. I have this generic method for saving or updating objects ... protected void saveOrUpdate(Object obj) { final Session session = sessionFactory.getCurrentSession(); session.saveOrUpdate(obj); } You can assume that every argument, "obj," will have a member field that is marked with the "@Id" annotation. I would like to change the return type to return an Object that represents the persisted object in the database (meaning if "obj" didn't contain an id before, what is returned is the database object with a populated id. What is the fastest way to do this given my versioning and generic constraints?

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  • How can I delete video stored in the photo library ?

    - by srikanth rongali
    I have saved video in to the photo library. -(void)exportVideo:(id)sender { NSString *path = [DOCUMENTS_FOLDER stringByAppendingString:@"/air.mp4"]; NSLog(@"Path:%@", path); NSLog(@"Export Button CLicked"); UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError: contextInfo:), nil); } - (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { NSLog(@"Finished saving video with error: %@", error); } Now I need to delete the video i have stored programmatically. How can I delete the video ? Are there any functions for it? Thank You.

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  • Error 5A - Internal CPU Error

    - by Mitch
    So I built myself a pc for the first time. The machine has been running properly, and without issue, since March of this year. Today after an hour or so of gaming the machine shutdown without warning. Any attempts to reboot have been unsuccessful. I have managed to get it to post, twice, but it doesn't get as far as the OS before it shuts off again. I pulled the second video card so I could see the error code LED and it appears to be showing 5A which matches to "Internal CPU Error". Am I looking at a failed CPU or is this a symptom of another issue? Any feedback you can provide is most appreciated. Here's my parts list: CPU: Intel Core i7-4930K 3.4GHz 6-Core CPU Cooler: Corsair H105 73.0 CFM Liquid Motherboard: Asus X79 Deluxe ATX LGA2011 Ram: G.Skill Ripjaws X Series 32GB (4 x 8GB) DDR3-1600 Video card (x2): EVGA GeForce GTX 770 2GB Power supply: Corsair 1000W ATX12V / EPS12V

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  • Which libraries use the "We Know Where You Live" optimization for std::make_shared?

    - by KnowItAllWannabe
    Over two years ago, Stephan T. Lavavej described a space-saving optimization he implemented in Microsoft's implementation of std::make_shared, and I know from speaking with him that Microsoft has nothing against other library implementations adopting this optimization. If you know for sure whether other libraries (e.g., for Gnu C++, Clang, Intel C++, plus Boost (for boost::make_shared)) have adopted this implementation, please contribute an answer. I don't have ready access to that many make_shared implementations, nor am I wild about digging into the bowels of the ones I have to see if they've implemented the WKWYL optimization, but I'm hoping that SO readers know the answers for some libraries off-hand. I know from looking at the code that as of Boost 1.52, the WKWYL optimization had not been implemented, but Boost is now up to version 1.55. Note that this optimization is different from std::make_shared's ability to avoid a dedicated heap allocation for the reference count used by std::shared_ptr. For a discussion of the difference between WKWYL and that optimication, consult this question.

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  • Creating an Application to Save Arbitrary Application State

    - by ashes999
    See this SuperUser question. To summarize, VM software lets you save state of arbitrary applications (by saving the whole VM image). Would it be possible to write some software for Windows that allows you to save and reload arbitrary application state? If so (and presumably so), what would it entail? I would be looking to implement this, if possible, in a high-level language like C#. I presume if I used something else, I would need to dump memory registers (or maybe dump the entire application memory block) to a file somewhere and load it back somewhere to refresh state. So how do I build this thing?

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  • mysql Incorrect Information in File: (corrupt) error

    - by Nick M.
    I've recently suffered from a power outage on one of my monitoring servers at the office. The result of that outage caused for some database tables to get corrupted. I've successfully repaired 3-4 tables by using the "use_frm" option however there are still 3 that seem to be badly corrupted and are not responding to the mysql REPAIR command (with or without use_frm) mysql> REPAIR TABLE poller_item; +-------------------+--------+----------+---------------------------------------------- ------------+ | Table | Op | Msg_type | Msg_text | +-------------------+--------+----------+------------------------------------------------- ---------+ | cacti.poller_item | repair | Error | Incorrect information in file: './cacti/poller_item.frm' | | cacti.poller_item | repair | error | Corrupt | +-------------------+--------+----------+------------------------------------------------- ---------+ In this scenario are there any other way to repair a table? MySQL Version mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) using readline 6.1

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  • How much data does windows write on boot

    - by soandos
    This question was inspired by Bob's comment to my answer here. On boot, windows writes files to the hard drive (I imagine this to be the case, as it has a way of detecting if the boot was previously interrupted by a hard power-off, and I am sure many other things). But assuming that there is a "smooth" boot, where there are no error, etc, and no logon scripts that run, and things like that, about how much (a few KB, a few MB, a few GB) data gets written to the drive? For simplicity's sake, assume that: hibernation is turned off windows 7 pagefile is turned off (does this matter right at boot, or only later?) How could one go about measuring this? Are there resources that have this information?

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  • How to tell iPhone NSURLConnection to abort

    - by Jahmic
    I have an app that makes moderate use of NSURLConnection. These async calls eventually finish and release properly (it looks like), but sometimes it takes some time for them to finish. So, there are times when I exit the app, (note, not just sending it the background), that some of these connections are still active. If I immediately restart the app, the app freezes on startup. (didFinishLaunchingWithOptions never seems to get called). While I'm not certain these connections are the issue, it would probably be good to terminate or cancel any remaining. Any suggestions on how to do this? Bonus points on how to debug the restart also. (I'm already saving NSLog statements to a downloadable file)

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  • Dell XT on Windows 7 never recovers from sleep

    - by user39408
    My Dell XT, after upgrade to windows 7 ultimate seems to never recover from a sleep i.e. opening the lid shows a flicker, and then all lights go off. When I press the power button long enough it reboots and says that Windows had a serious error, blah blah (but no BSOD). Hibernate doesnt cause any problem, and that is what I am doing as default. Any idea how to debug more and fix it. Looked around (on web) for answer, tried related solutions (hotfixes for similar but not same problems) etc, but noting fixes this.

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