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  • How to write "good" user interface texts?

    - by Roddy
    Many applications are let down by the quality of the 'writing' in their user interfaces: typically, poor spelling, grammar, inconsistent tone, and worse yet, "humour" are the usual offenders. Are there good resources that can help developers to write UI messages that give a professional and positive impression to your customers, even when your code's going to hell in a handcart? Thanks, all — Some great resources here, so I will CW this question. I'm accepting Adam Sill's answer because it's the one that (as a developer of desktop apps) I found most pertinent.

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  • What's the purpose of the lua "stub" dll for windows.

    - by Roddy
    I'm looking at incorporating Lua into a C++ project, and am a bit confused by the presence of the two binaries (lua51.dll and lua5.1.dll) in the distribution from Luabinaries. According to the docs... In Windows your library or application must be linked with a stub library. A stub library is a library with only the function declarations that will bind your DLL with the Lua DLL. Why? I've never needed stub DLLs before when linking with third-party DLLs?

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  • How to camelcase decibels?

    - by Roddy
    The standard abbreviations for decibels is "dB" (note the case!) So, if I have a variable, holding (for instance) a maximum dB value, how best to name it? maxDbValue maxdBValue maxDecibelValue something else? Each has disdvantages - #1 swaps the case of the unit, #2 doesn't clearly split max from dB, and #3 is verbose... I think #1 feels best, but...???

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  • Is 23,148,855,308,184,500 a magic number, or sheer chance?

    - by Roddy
    News reports such as this one indicate that the above number may have arisen as a programming bug. A man in the United States popped out to his local petrol station to buy a pack of cigarettes - only to find his card charged $23,148,855,308,184,500. That is $23 quadrillion (£14 quadrillion) - many times the US national debt.* In hex it's $523DC2E199EBB4 which doesn't appear terribly interesting at first sight. Anyone have any thoughts about what programming error would have caused this?

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  • "Temporary object" warning - is it me or the compiler?

    - by Roddy
    The following snippet gives the warning: [C++ Warning] foo.cpp(70): W8030 Temporary used for parameter '_Val' in call to 'std::vector<Base *,std::allocator<Base *> >::push_back(Base * const &)' .. on the indicated line. class Base { }; class Derived: public Base { public: Derived() // << warning disappears if constructor is removed! { }; }; std::vector<Base*> list1; list1.push_back(new Base); list1.push_back(new Derived); // << Warning on this line! Compiler is Codegear C++Builder 2007. Oddly, if the constructor for Derived is deleted, the warning goes away... Is it me or the compiler?

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  • How to 'hide' spurious "declared but never used" warnings?

    - by Roddy
    I'm using the C++Builder compiler which has a minor bug that certain static const items from system header files can cause spurious "xyzzy is declared but never used" warnings. I'm trying to get my code 100% warning free, so want a way of masking these particular warnings (note - but not by simply turning off the warning!) Also, I can't modify the header files. I need a way of 'faking' the use of the items, preferably without even knowing their type. As an example, adding this function to my .cpp modules fixes warnings for these four items, but it seems a bit 'ad-hoc'. Is there a better and preferably self-documenting way of doing this? static int fakeUse() { return OneHour + OneMinute + OneSecond + OneMillisecond; }

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  • How to easily map c++ enums to strings

    - by Roddy
    I have a bunch of enum types in some library header files that I'm using, and I want to have a way of converting enum values to user strings - and vice-versa. RTTI won't do it for me, because the 'user strings' need to be a bit more readable than the enumerations. A brute force solution would be a bunch of functions like this, but I feel that's a bit too C-like. enum MyEnum {VAL1, VAL2,VAL3}; String getStringFromEnum(MyEnum e) { switch e { case VAL1: return "Value 1"; case VAL2: return "Value 2"; case VAL1: return "Value 3"; default: throw Exception("Bad MyEnum"); } } I have a gut feeling that there's an elegant solution using templates, but I can't quite get my head round it yet. UPDATE: Thanks for suggestions - I should have made clear that the enums are defined in a third-party library header, so I don't want to have to change the definition of them. My gut feeling now is to avoid templates and do something like this: char * MyGetValue(int v, char *tmp); // implementation is trivial #define ENUM_MAP(type, strings) char * getStringValue(const type &T) \ { \ return MyGetValue((int)T, strings); \ } ; enum eee {AA,BB,CC}; - exists in library header file ; enum fff {DD,GG,HH}; ENUM_MAP(eee,"AA|BB|CC") ENUM_MAP(fff,"DD|GG|HH") // To use... eee e; fff f; std::cout<< getStringValue(e); std::cout<< getStringValue(f);

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  • Returning pointers in a thread-safe way.

    - by Roddy
    Assume I have a thread-safe collection of Things (call it a ThingList), and I want to add the following function. Thing * ThingList::findByName(string name) { return &item[name]; // or something similar.. } But by doing this, I've delegated the responsibility for thread safety to the calling code, which would have to do something like this: try { list.lock(); // NEEDED FOR THREAD SAFETY Thing *foo = list.findByName("wibble"); foo->Bar = 123; list.unlock(); } catch (...) { list.unlock(); throw; } Obviously a RAII lock/unlock object would simplify/remove the try/catch/unlocks, but it's still easy for the caller to forget. There are a few alternatives I've looked at: Return Thing by value, instead of a pointer - fine unless you need to modify the Thing Add function ThingList::setItemBar(string name, int value) - fine, but these tend to proliferate Return a pointerlike object which locks the list on creation and unlocks it again on destruction. Not sure if this is good/bad practice... What's the right approach to dealing with this?

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  • How to write "good" user interface text?

    - by Roddy
    Many applications are let down by the quality of the 'writing' in their user interfaces: typically, poor spelling, grammar, inconsistent tone, and worse yet, "humour" are the usual offenders. Are there good resources that can help developers to write UI messages that give a professional and positive impression to your customers, even when your code's going to hell in a handcart? Thanks, all — Some great resources here, so I will CW this question. I'm accepting Adam Sill's answer because it's the one that (as a developer of desktop apps) I found most pertinent.

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  • Undefined behaviour with non-virtual destructors - is it a real-world issue?

    - by Roddy
    Consider the following code: class A { public: A() {} ~A() {} }; class B: public A { B() {} ~B() {} }; A* b = new B; delete b; // undefined behaviour My understanding is that the C++ standard says that deleting b is undefined behaviour - ie, anything could happen. But, in the real world, my experience is that ~A() is always invoked, and the memory is correctly freed. if B introduces any class members with their own destructors, they won't get invoked, but I'm only interested in the simple kind of case above, where inheritance is used maybe to fix a bug in one class method for which source code is unavailable. Obviously this isn't going to be what you want in non-trivial cases, but it is at least consistent. Are you aware of any C++ implementation where the above does NOT happen, for the code shown?

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  • Display streaming video in desktop app.

    - by Roddy
    I have a Windows native desktop app (C++/Delphi), and I'm successfully using Directshow to display live video in it from a 'local' video capture device. The next thing I want to do is display video from a 'remote' capture device, streamed over the LAN. To stream the video, I guess I can use something like Expression Encoder or VLC, but I'm not sure what's the easiest way to receive/decode the streamed video. Inserting an ActiveX VLC or Flash player might be one option (although the licensing may be an issue then), but I was wondering if there's any way to achieve this with Directshow... Application needs to run on XP, and the video decoding should ideally be royalty free. Suggestions, please!

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  • Switching to Java from C++: What are the key points?

    - by Roddy
    I'm an experienced developer, but most of my OO programming experience has been with C++ (and a little Delphi). I'm considering doing some Android work, hence Java. Coming from the C++ background, what areas of Java are most likely to surprise/annoy/delight me? I felt sure this would already have been asked, but my searches haven't turned up a similar question. CW, of course.

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  • Are C++ Templates just Macros in disguise?

    - by Roddy
    I've been programming in C++ for a few years, and I've used STL quite a bit and have created my own template classes a few times to see how it's done. Now I'm trying to integrate templates deeper into my OO design, and a nagging thought keeps coming back to me: They're just a macros, really... You could implement (rather UGLY) auto_ptrs using #defines, if you really wanted to. This way of thinking about templates helps me understand how my code will actually work, but I feel that I must be missing the point somehow. Macros are meant evil incarnate, yet "template metaprogramming" is all the rage. So, what ARE the real distinctions? and how can templates avoid the dangers that #define leads you into, like Inscrutable compiler errors in places where you don't expect them? Code bloat? Difficulty in tracing code? Setting Debugger Breakpoints?

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  • Is there a 'catch' with FastFormat?

    - by Roddy
    I just read about the FastFormat C++ i/o formatting library, and it seems too good to be true: Faster even than printf, typesafe, and with what I consider a pleasing interface: // prints: "This formats the remaining arguments based on their order - in this case we put 1 before zero, followed by 1 again" fastformat::fmt(std::cout, "This formats the remaining arguments based on their order - in this case we put {1} before {0}, followed by {1} again", "zero", 1); // prints: "This writes each argument in the order, so first zero followed by 1" fastformat::write(std::cout, "This writes each argument in the order, so first ", "zero", " followed by ", 1); This looks almost too good to be true. Is there a catch? Have you had good, bad or indifferent experiences with it? CW on this question, as there's probably no right answer...

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  • round() for float in C++

    - by Roddy
    I need a simple floating point rounding function, thus: double round(double); round(0.1) = 0 round(-0.1) = 0 round(-0.9) = -1 I can find ceil() and floor() in the math.h - but not round(). Is it present in the standard C++ library under another name, or is it missing??

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  • What does "performant" software actually mean?

    - by Roddy
    I see it used a lot, but haven't seen a definition that makes complete sense. Wiktionary says "characterized by an adequate or excellent level of performance or efficiency", which isn't much help. Initially I though performant just meant "fast", but others seem to think it's also about stability, code quality, memory use/footprint, or some combination of all those. I think this is a "real" question - but if enough people reckon this is a subjective question, that's an answer in itself.

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  • Windows 7 Starter Screensaver Program Original Files

    - by Mark
    Dear Sir or Madam I used the program by Sopan and Javier to change the wallpaper in Windows 7 Starter Edition on my laptop and it worked fine. I have now upgraded to Home Edition but there seems to be remnants of the program still lurking somewhere as when I set photos up for the screensaver they are always stretched no matter what I set the picture position as, ie fill,fit,stretched, tiled or centred. Can Sopan or Javier or anyone else supply original copies please of the files the program modified so that I can over-write the modified files back to the original ones? I know I can re-install the full windows 7 software but I want to save the agony of that along with the re-installation of all my programs and drivers! Many thanks for your help. Mark

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  • Always a path to the internet even in Windows SBS is off

    - by Mark
    Hello all, is it possible to have a configuration in a Windows 2003 SBS environment where in the event that the SBS box crashed/turned off/ or is being worked on that there can still exist a path to the internet for domain users and visitors to still use? I would like to have the standalone router issue DHCP IPs. The primary DNS would point to the SBS, the secondary wouuld point to the ISP DNS Server. My theory was that if someone was using the internet and the SBS box went down they wouldn't be able to access the network shares but still be able to use the internet. (We are moving everything into the clouds with Google Apps Non-Profit) Does this seem like a reasonable configuration? Or are they're pitfalls that I will fall into? Thanks Mark

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  • TIME_WAIT connections not being cleaned up after timeout period expires

    - by Mark Dawson
    I am stress testing one of my servers by hitting it with a constant stream of new network connections, the tcp_fin_timeout is set to 60, so if I send a constant stream of something like 100 requests per second, I would expect to see a rolling average of 6000 (60 * 100) connections in a TIME_WAIT state, this is happening, but looking in netstat (using -o) to see the timers, I see connections like: TIME_WAIT timewait (0.00/0/0) where their timeout has expired but the connection is still hanging around, I then eventually run out of connections. Anyone know why these connections don't get cleaned up? If I stop creating new connections they do eventually disappear but while I am constantly creating new connections they don't, seems like the kernel isn't getting chance to clean them up? Is there some other config options I need to set to remove the connections as soon as they have expired? The server is running Ubuntu and my web server is nginx. Also it has iptables with connection tracking, not sure if that would cause these TIME_WAIT connections to live on. Thanks Mark.

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  • Apache KeepAlive in child location not working

    - by Mark Beaton
    I'm trying to turn keep-alive connections off for a requests to a child folder in Apache, but when I reload the config I get the following error: KeepAlive not allowed here Here's my vhost config: <VirtualHost *:80> ServerAdmin [email protected] ServerName example.com DocumentRoot /srv/www/mysite DirectoryIndex index.html <Location /subfolder> KeepAlive Off </Location> </VirtualHost> I've tried using <Directory> as well, but no go there either. Any ideas? I'd rather not turn keep-alive off for the whole site...

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  • radius traffic accounting - what attributes do I use for traffic (and how)

    - by Mark Regensberg
    we are building a web front end for a internet access token management system that uses radius (freeradius) queried from a captive portal. Reason for building this part is the integration into the accounting and billing platform that operates behind the scenes (all other parts are currently available open source software) The structure is fairly standard, and setting up the basic bits were easy enough (authentication, traffic updates from the captive portal, account expiry date/times) - but I seem to have run out of ability when it comes to limiting an account by traffic consumed. So we can: set up usernames / passwords set expiry dates/times for a given user see the traffic for that user being accurately updated in RADACCT But we can't figure out the correct way/attribute to expire a user when they have consumed X octets of traffic. What attributes are used, or - maybe more accurately - what would be the correct way to use these attributes to limit an account to a certain volume of traffic? Any links to documentation appreciated - freeradius documentation doesn't seem to address the issue directly, or I'm looking in the wrong place... --mark

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  • gitosis always asks for git password

    - by Cylindric
    I've just followed the simple gitosis install instructions on an Ubuntu server, such as these http://blog.agdunn.net/?p=277 On the server I log in as "mark", and into /home/mark/.ssh/ I copied my keyfiles id_rsa and id_rsa.pub from my laptop. I used that id_rsa.pub when initialising the gitosis stuff, and can happily connect locally when logged in as 'mark'. From my laptop though, where I have the same keys, I can't connect. I just get an error: git clone git@support:gitosis-admin.git Initialized empty Git repository in u:/gitosis-admin/.git fatal: The remote end hung up unexpectedly The server is Ubuntu 9.04, the client is a Win7 laptop with Cygwin and WinSysGit.

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