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  • How are OpenGL programs debugged?

    - by manasij7479
    I'm trying to find what is causing a segfault when glDrawArrays is called (as gdb says) in my simple program. When I use the OpenGl calls directly, the program runs fine. But when I wrap them up into two classes (under construction, of vao and vbo) the program segfaults. So, in my wrappers, I definitly disabled something or set something I'm not supposed to. My question is, how do I get some diagnostics that will help me pinpoint the source of the problem ? I'm looking for something similar to what glGetShaderiv does, but for vao and vbo s, that will tell me if I have..say.. unbound a buffer by mistake. [I'm not posting the code here, but if any of you want to donate some time by testing a segfaulting example, here is a tar.gz of the source . You'll need working libraries of sfml-2.0rc, glew and gcc=4.6 .]

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  • Do c++ templates make programs slow ?

    - by user293398
    Hi, I have heard from many people that usage of templates make the code slow. Is it really true. I'm currently building a library. There are places where if templates are not created, it would result in code management problem. As of now I can think two solutions to this problem: o use #defines o Use templates and define all possible types in the header file/library itself but do not allow end user to make template instances. e.g. typedef Graph GraphI32; etc. Is there anyway, to restrict user from creating various template instances on their own. Help on above queries would be highly regarded.

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  • definition of wait-free (referring to parallel programming)

    - by tecuhtli
    In Maurice Herlihy paper "Wait-free synchronization" he defines wait-free: "A wait-free implementation of a concurrent data object is one that guarantees that any process can complete any operation in a finite number of steps, regardless the execution speeds on the other processes." www.cs.brown.edu/~mph/Herlihy91/p124-herlihy.pdf Let's take one operation op from the universe. (1) Does the definition mean: "Every process completes a certain operation op in the same finite number n of steps."? (2) Or does it mean: "Every process completes a certain operation op in any finite number of steps. So that a process can complete op in k steps another process in j steps, where k != j."? Just by reading the definition i would understand meaning (2). However this makes no sense to me, since a process executing op in k steps and another time in k + m steps meets the definition, but m steps could be a waiting loop. If meaning (2) is right, can anybody explain to me, why this describes wait-free? In contrast to (2), meaning (1) would guarantee that op is executed in the same number of steps k. So there can't be any additional steps m that are necessary e.g. in a waiting loop. Which meaning is right and why? Thanks a lot, sebastian

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  • Communicating Between .NET Programs

    - by IronManIngellis
    I wanted to set up a simple data communication between two C# applications, and I'm not sure what the best method is in doing so. I've previously used Java Sockets and ServerSockets to get the job done, but I'm new to C#, so I've come for advice :) It's going to be two way communication with two clients exchanging strings or something of the like.

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  • Determining if Memory Pointer is Valid - C++

    - by Jim Fell
    It has been my observation that if free( ptr ) is called where ptr is not a valid pointer to system-allocated memory, an access violation occurs. Let's say that I call free like this: LPVOID ptr = (LPVOID)0x12345678; free( ptr ); This will most definitely cause an access violation. Is there a way to test that the memory location pointed to by ptr is valid system-allocated memory? It seems to me that the the memory management part of the Windows OS kernel must know what memory has been allocated and what memory remains for allocation. Otherwise, how could it know if enough memory remains to satisfy a given request? (rhetorical) That said, it seems reasonable to conclude that there must be a function (or set of functions) that would allow a user to determine if a pointer is valid system-allocated memory. Perhaps Microsoft has not made these functions public. If Microsoft has not provided such an API, I can only presume that it was for an intentional and specific reason. Would providing such a hook into the system prose a significant threat to system security? Situation Report Although knowing whether a memory pointer is valid could be useful in many scenarios, this is my particular situation: I am writing a driver for a new piece of hardware that is to replace an existing piece of hardware that connects to the PC via USB. My mandate is to write the new driver such that calls to the existing API for the current driver will continue to work in the PC applications in which it is used. Thus the only required changes to existing applications is to load the appropriate driver DLL(s) at startup. The problem here is that the existing driver uses a callback to send received serial messages to the application; a pointer to allocated memory containing the message is passed from the driver to the application via the callback. It is then the responsibility of the application to call another driver API to free the memory by passing back the same pointer from the application to the driver. In this scenario the second API has no way to determine if the application has actually passed back a pointer to valid memory.

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  • free geolocation geoip, are they viable?

    - by brett
    I'm trying to get a visitor's location based on their IP, pretty common stuff. My research so far shows that there's a database from MaxMind that costs $370 + $90/month... not the type of cost I can afford. Then there's a free version called GeoLite City. Anyone used these before? Drop a quick line here please. Why is one free and the answer so expensive. Is the free one usable, is it not as accurate, what's the catch? P.S. Any other suggestions are welcome.

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  • How to handle application upgrades from free to paid version while preserving any data

    - by cdonner
    Here is the context. I want to have a free version and a premium version of the same application. When people buy the application, I want them to be able to "upgrade" without losing their data, i.e. the premium version should install over the free version. I want to use the same code base and just switch a setting to build the premium version. Andoid Market does not let me convert a free app to a paid app, so the trivial option is not available. I am curious if someone has tried this successfully. How does Android Market identify an application - will it think that the premium version is a different app and just install it in parallel?

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  • Using malloc/free in Objective-C object

    - by Itamar Katz
    I have a class AudioManager with a member of type AudioBufferList *. (This is a struct declared in the CoreAudio framework). Since AudioBufferList is not a NSObject, I cannot retain it, so I have to alloc/free it (correct me if I'm wrong). My question is, where is the 'right' place to free it? Currently I am doing it in the dealloc method of AudioManager. If I understand correctly, this method is invoked automatically once the release message is sent to the instance of AudioManager --- is that true? Is there any other recommended practice regarding using alloc/free on non-objects members of Objective-C objects? Edit: From Apples documentation: Subclasses must implement their own versions of dealloc to allow the release of any additional memory consumed by the object—such as dynamically allocated storage for data or object instance variables owned by the deallocated object. After performing the class-specific deallocation, the subclass method should incorporate superclass versions of dealloc through a message to super: Which makes things a little bit clearer - but more insights are appreciated.

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  • Any free (or cheaper) jqGrid alternatives?

    - by upthecreek
    jqGrid seems pretty good to me, but I don't like the price ($299! - for a JQuery plugin this seems waaay to high to me) Does anyone know of a similar component, for use with ASP.NET MVC, which is either free or less pricey? Thanks EDIT: If looks like I may have got the licensing terms wrong. From this page, it looked like there was no free for commercial use option. But, According to last poster this is incorrect. Can anyone else confirm it is free for commercial use?

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  • best analogy to explain free software floss to non geeks

    - by opensas
    How do you explain free libre open source software to a computer illiterate guy? Two well known analogies I've often heard are: free software as a meal recipe, a set of instructions for you to inspect, learn, put into practice, and improve... versus a canned meal that you can only swallow without even knowing what you're eating... and the other is comparing privative software to a car that you aren't allowed to open it's trunk to see inside in case anything goes wrong... I'd like to know what other analogies you know that might help us explain free software to non geeks saludos sas

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  • ASP.NET + GoDaddy Free Hosting?

    - by Sahat
    Has anyone successfully been able to deploy ASP.NET website to GoDaddy's free hosting? I am talking about free hosting that comes with a domain package from GoDaddy. The catch of the free hosting is having an annoying Google Ads banner in a frame on top of the page. I've searched Google, stackoverflow and GoDaddy forums but I can't find anywhere the solution to my problem. When I upload a ASP.NET website to GoDaddy, it gives me an error - something about TrustLevel. Someone told me that by default asp.net websites have Full Trust Level which GoDaddy doesn't allow. I've even tried changing Trust Level to Medium manually, but with no luck. What may be the problem?

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  • iPhone + upgrade existing paid application on app store to free application with In App purchase + w

    - by pratik
    Hello, I have implemented In App purchase in my existing application. This application is currently available on app store as paid application, I want to update this paid application to free application with this In App purchase feature, where users can download it freely and have to pay for few features to unlock them. But the problem is that, if I update the existing paid application as free application (with few features locked and user has to buy it to unlock it), what about the users who have already purchased this application. Because when they will update to new free application, few features will be locked and they have to pay again to unlock them (why should they pay, if they have already purchased whole application previously). Regards, Pratik

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  • dangling pointer, reason for value change after free()?

    - by Aman Jain
    In the following code segment, after free(x), why does y becomes 0? As per my understanding, the memory in the heap that was being pointed to by x, and is still being pointed by y, hasn't been allocated to someone else, so how can it change to 0? And moreover, I don't think it is free(x) that changed it to 0. Any comments? #include <stdio.h> int main ( int argc, char *argv[] ) { int *y = NULL; int *x = NULL; x = malloc(4); *x = 5; y = x; printf("[%d]\n", *y); //prints 5 free(x); printf("[%d]\n", *y); //why doesn't print 5?, prints 0 instead return 0; }

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  • Java M4A atom tagging free space issue

    - by Brett
    Hey, I've been trying to be able to read and write iTunes style M4A atoms and while I've successfully done the reading part, I've come to a bit of a halt in regards to the free space atoms. I figured that I should be able edit and shift the padding around to accommodate writing an atom with more data than it originally had. I've been stuck on this for about a day now, and I've been trying to figure out how to determine the closest free space atom with enough size to accommodate the new data. so far I have: private freeAtom acquireFreeSpaceAtom( long position ) { long atomStart = Long.MAX_VALUE; freeAtom atom = null; for( freeAtom a : freeSpace ) { if( Math.abs( position - atomStart ) > Math.abs( position - a.getAtomStart() ) ) atomStart = ( atom = a ).getAtomStart(); } return atom; } That code only takes into account the closest free space atom and completely disregards the fact that it should be greater than or equal to a certain size, but I can't quite figure out how I should check for both closeness and size efficiently.

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  • Free and Simple Hosting Solution with DB Support?

    - by darren
    Hi everyone I have compiled an sqlite database that I would like to make public. I want to provide a very simple webpage that has a few form elements which are used to query the database. Does anybody know of a free hosting solution that would provide me with free web and database functionality? I am familiar with Google App Engine and that would work but I don't want to spend time using their custom storage scheme. I'm looking for something free that I can put together very quickly. Thanks for any suggestions.

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  • Is there a free private Git repository?

    - by saturngod
    Currently I use http://www.codaset.com/ for a private repository. It's free but it can't be free forever. Codaset is nice git repo and we can write blog and wiki entries in there. I want to use a private repo for my private project. This isn't a commercial project or a big project. I also found http://www.projectlocker.com but the user interface is so poor. So, I want to use something like codaset or github repo, for free at least 1 user and 100 MB git repo.

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  • Free Dynamic DNS Nameservers

    - by Maxim Zaslavsky
    I recently set up a home server that I want to use as my primary hosting platform. So far, I've mapped some domains to it by setting up A records for them that point to my home IP. As my home IP can change randomly and without notice, however, I'm afraid of such downtime. Thus, I'm looking for a dynamic DNS solution. So far, I've set up DynDNS, but I haven't found a way to use dynamic DNS with an existing domain. Are there any free dynamic DNS nameserver services available?

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  • OpenVPN access server on Amazon VPC vs free version

    - by imaginative
    Maybe I'm missing the point, but I'd like to setup simple VPN access with software VPN to access my private network on Amazon VPC. I thought OpenVPN would be a great solution for this, and I thought it might make sense to put this on the NAT instance that comes with VPC so I don't have to spend money on another instance. Is there any advantage to running the following: http://www.openvpn.net/index.php?option=com_content&id=493 vs sticking to the free solution of OpenVPN? What does one offer over the other? Any reason not to run this on the NAT instance itself?

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  • Free Windows traffic monitor that can run a command when reaching a limit

    - by leromarinvit
    Does anyone know a free traffic monitor tool for Windows XP which can run a configurable program when reaching a limit? Hoo Net Meter and DU Meter can do that, but they both cost money. What I'm trying to do is throttle the connection when getting close to the monthly limit, so that watching YouTube or downloading large files isn't fun any longer, but e-mail or looking something up still work. The throttling part is settled, Traffic Shaper XP works nicely. I just need something to automatically call a batch script when reaching the limit.

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  • Light-weight, free, database query tool for Windows?

    - by NoCatharsis
    My question is very similar to the one here except pertaining to a Windows tool. I am also referencing this table and what I found here with a Google search. However, I have no idea which tool would best meet my (very basic) purposes. I am currently using Excel with a basic ODBC connection string to query my database at work. However, Excel is pretty memory-heavy and a basic query tends to throw my computer into a 30 second stall-a-thon. Is there a free tool out there that is light-weight and can serve the same purpose when provided an ODBC connection and a SQL query? Also would prefer that it easily copies over to a spreadsheet as needed.

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  • (Free?) Hosting Control Panels

    - by Alix Axel
    I've installed and used both cPanel and Plesk on my dedicated servers in the past and I truly enjoyed the features and simplicity of cPanel (specially the auto-update feature in WHM), recently (a couple of months ago) I also tried a beta version of the open-source OpenPanel and although it looks really nice I found it kinda limited in terms of features, such as automatic system updates, automatic backups and the ability to add addicional hosts to the MySQL allowed clients list - just to name a few. Besides OpenPanel, I'm aware of Usermin, Webmin, Virtualmin, ISPConfig, VHCS, web-cp and FlexCP - although I've never had the opportunity to try any of them before... Are you familiar and recommend any of these? It's been a while since I managed a dedicated server and I'm wondering what would be a good hosting control panel for me, preferably a free / open-source one that has similar features / usability of cPanel. I appreciate all input, thanks! =)

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  • best ftp program (paid - not free)

    - by Victor Kimura
    Just would like some feedback on the best ftp program (not free). The requirements I'm looking for is: - secure ftp - for use on mac, linux, windows - backup utility with scheduler - for use on more than one computer (multi-license) I'm using wsftp from 2007 right now but it's only good for windows. It's license is only good for one computer. And after some vista updates it's making some strange noises. I tried to turn off the noise (via control panel) and it's still making that noise and I turned off the sound within wsftp too. I like the program but I think it's time to look for a new one. Thank you, Victor

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