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  • Nested Functions in C - Best Practices

    - by Justin Ethier
    I just realized a function may be defined inside another function in C: void main(){ int foo(){ return 2; }; printf("%d\n", foo()); } Besides being a neat trick, the useful thing about this is that the inner function is private to the outer function. But... is that a good enough reason to do this in a "real-world" application? What are the best practices for using this syntax?

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  • uploadify email notification

    - by kwek-kwek
    Is it possible for "Uploadify" to send out e-mail confirmation after the upload? here is the script: <script type="text/javascript"> $(document).ready(function() { $("#uploadify").uploadify({ 'uploader' : 'scripts/uploadify.swf', 'script' : 'scripts/uploadify.php', 'cancelImg' : 'cancel.png', 'folder' : 'uploads', 'auto' : true, 'multi' : true, 'onComplete' : function(event, queueID, fileObj, response, data) { $('#message').html( 'files were successfully uploaded'); $('#message').show().animate({'display':'block'},3000).hide(500); } }); }); </script>

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  • Best way to implement try catch in php4

    - by rgz
    What is the closest you can get to a try-catch block in php4? I'm in the middle of a callback during an xmlrpc request and it's required to return a specifically structured array no matter what. I have to error check all accesses to external resources, resulting in a deep stack of nested if-else blocks, ugly.

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  • How to use sprintf instead of hardcoded values

    - by astha goyal
    I am developing a firewall for Linux as my project. I am able to capture packets and to block them. I am using IPTABLES. How can I use variables with sprintf instead of hardcoded values? sprintf(comm, "iptables -A INPUT -s $str -j DROP") // inplace of: sprintf(comm, "iptables -A INPUT -s 192.168.0.43 -j DROP")

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  • How to implement Cross Browser Opacity Gradient (Not Color Gradient)

    - by brz dot net
    How can I implement cross browser opacity gradient (not color gradient)? See following code: <div style="background-color:Red;display:block;height:500px;width:500px;filter:alpha(Opacity=100, FinishOpacity=0, Style=1, StartX=0, StartY=0, FinishX=0, FinishY=500)"></div> It works fine in IE but not in other browsers like firefox,safari..etc. What is equivalent syntax for firefox? Please don't suggest me to use gradient image.

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  • Scala: "using" keyword

    - by Albert Cenkier
    i've defined 'using' keyword as following: def using[A, B <: {def close(): Unit}] (closeable: B) (f: B => A): A = try { f(closeable) } finally { closeable.close() } i can use it like that: using(new PrintWriter("sample.txt")){ out => out.println("hellow world!") } now i'm curious how to define 'using' keyword to take any number of parameters, and be able to access them separately: using(new BufferedReader(new FileReader("in.txt")), new PrintWriter("out.txt")){ (in, out) => out.println(in.readLIne) }

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  • Keyboard Controls ?

    - by Asim Sajjad
    Hello World I am creating a financial software working on a touch panel machine. I have created a Keyboard control for User Input. I want to open start menu on my keyboard's Window button click. Please tell me hows that possible... Its very urgent

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  • A good resource for an overview of web technologies

    - by Vijay
    Hello Every one, I have been working on microsoft based web technologies (.net, sql server, iis) for about an year and would like to know the opensource alternatives for the above. I have heard of LAMP, Java based technologies, ruby on rails etc. Can you please point me to a place where I can find more information about these and how they match up against each other. Basically I am looking for an overview of the popular web technologies in today's world. Thanks a lot. Vijay

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  • imagick showing script url instead of image

    - by Raz
    Hi, currently i'm trying to use imagick to generate some images without saving them on the server and then outputting to the browser, my method of choice was image magic with the imagick extension for php. I read the documentation, and i'm sure the package is installed on my machine (windows xp, with xampp). the class is installed imagick module enabled imagick module version 2.0.0-alpha imagick classes Imagick, ImagickDraw, ImagickPixel, ImagickPixelIterator ImageMagick version ImageMagick 6.3.3 04/21/07 Q16 http://www.imagemagick.org ImageMagick release date 04/21/07 ImageMagick Number of supported formats: 164 ImageMagick Supported formats A, ART, AVI, AVS, B, BIE, BMP, BMP2, BMP3, C, CACHE, CAPTION, CIN, CIP, CLIP, CLIPBOARD, CMYK, CMYKA, CUR, CUT, DCM, DCX, DFONT, DPS, DPX, EMF, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, FAX, FITS, FRACTAL, FTS, G, G3, GIF, GIF87, GRADIENT, GRAY, HISTOGRAM, HTM, HTML, ICB, ICO, ICON, INFO, JBG, JBIG, JNG, JP2, JPC, JPEG, JPG, JPX, K, LABEL, M, M2V, MAP, MAT, MATTE, MIFF, MNG, MONO, MPC, MPEG, MPG, MSL, MSVG, MTV, MVG, NULL, O, OTB, OTF, PAL, PALM, PAM, PATTERN, PBM, PCD, PCDS, PCL, PCT, PCX, PDB, PDF, PFA, PFB, PGM, PGX, PICON, PICT, PIX, PJPEG, PLASMA, PNG, PNG24, PNG32, PNG8, PNM, PPM, PREVIEW, PS, PS2, PS3, PSD, PTIF, PWP, R, RAS, RGB, RGBA, RGBO, RLA, RLE, SCR, SCT, SFW, SGI, SHTML, STEGANO, SUN, SVG, SVGZ, TEXT, TGA, THUMBNAIL, TIFF, TILE, TIM, TTC, TTF, TXT, UIL, UYVY, VDA, VICAR, VID, VIFF, VST, WBMP, WMF, WMFWIN32, WMZ, WPG, X, XBM, XC, XCF, XPM, XV, XWD, Y, YCbCr, YCbCrA, YUV this is from the phpinfo so i know i have it installed, the thing is when i try to generate an image and save it, it works flawlessly, but when i try to output the image directly, i get the script url as an image $draw = new ImagickDraw(); $draw->setFont('AnkeCalligraph.TTF'); $draw->setFontSize(52); $draw->annotation(110, 110, "Hello World!"); $draw->annotation(50, 220, "Hello World!"); $canvas = new Imagick('./pictures/test_live.PNG'); $canvas->drawImage($draw); $canvas->setImageFormat('png'); header("Content-Type: image/png"); echo $canvas; this is the code used. if i use writeimage, then the file on the server is created with no problems. does anyone have any ideas what i'm doing wrong ?

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  • Retro video games programming

    - by SebKom
    I just watched the Super Mario Bros. -1 World glitch in youtube and I really began wondering about the code behind those games. Which language was used? What about the OS for the video games consoles? Are there any website with resources about this subject? (I am a 90s video gamer so I am particularly interested about the programming behind those games but feel free to make this a wiki and include links to resources about video games programming in general, if you want)

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  • Complex error handling

    - by Caspin
    I've got a particularly ornery piece of network code. I'm using asio but that really doesn't matter for this question. I assume there is no way to unbind a socket other than closing it. The problem is that open(), bind(), and listen() can all throw a system_error. So I handled the code with a simple try/catch. The code as written in broken. using namespace boost::asio; class Thing { public: ip::tcp::endpoint m_address; ip::tcp::acceptor m_acceptor; /// connect should handle all of its exceptions internally. bool connect() { try { m_acceptor.open( m_address.protocol() ); m_acceptor.set_option( tcp::acceptor::reuse_address(true) ); m_acceptor.bind( m_address ); m_acceptor.listen(); m_acceptor.async_accept( /*stuff*/ ); } catch( const boost::system::system_error& error ) { assert(acceptor.is_open()); m_acceptor.close(); return false; } return true; } /// don't call disconnect unless connect previously succeeded. void disconnect() { // other stuff needed to disconnect is ommited m_acceptor.close(); } }; The error is if the socket fails to connect it will try to close it in the catch block and throw another system_error about closing an acceptor that has never been opened. One solution is to add an if( acceptor.is_open() ) in the catch block but that tastes wrong. Kinda like mixing C-style error checking with c++ exceptions. If I where to go that route, I may as well use the non-throwing version of open(). boost::system::error_code error; acceptor.open( address.protocol, error ); if( ! error ) { try { acceptor.set_option( tcp::acceptor::reuse_address(true) ); acceptor.bind( address ); acceptor.listen(); acceptor.async_accept( /*stuff*/ ); } catch( const boost::system::system_error& error ) { assert(acceptor.is_open()); acceptor.close(); return false; } } return !error; Is there an elegant way to handle these possible exceptions using RAII and try/catch blocks? Am I just wrong headed in trying to avoid if( error condition ) style error handling when using exceptions?

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  • in flashbuilder (flex 4) select enclosing element

    - by core07
    Seems Adobe ignores strong movement now towards the productive programming. E.g. flash builder ide lacks keyboard shortcuts that are very useful in eclipse. If code templates, extract method, extract local variables are covered by some not-free plugins (and not cheap) like source mate, expanding selection to enclosing element I cannot find how to enable. Maybe you guys know some plugins doing that? Usually in eclipse it is Alt Shift Up to select enclosing block.

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  • Good event calendaring / scheduling design guide?

    - by Neil McF
    Hello, In an application I'm designing, the user has to be able to specify rather complex event scheduling (continuous time-block vs. daily time-blocks, exception date/times, recurrence patterns etc.) Does anyone know of a good design page for such a thing online? For example, I was highly impressed with this page's description of how to do database audit trails, and would love something similar. Thanks.

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  • OPENSSL_add_all_algorithms_noconf could not be located

    - by Fedrick
    Hi all, I am getting an error when I go to start my world. it says that " The procedure entry point OPENSSL_add_all_algorithms_noconf could not be located in the dynamic link library libeay32.dll".I have tried re loading the whole thing, just downloading the dll file, downloading a dll file form the internet but nothing fixes it. Anyone got a suggestion? Thanks in Advance

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  • Composite operations in Android Canvas

    - by kayahr
    I'm just starting with Android development and I'm coming from JavaScript/HTML world so I'm currently investigating the possibilities of the Android SDK. The HTML 5 canvas supports composite operations (See here). Is this possible in an Android Canvas? I scanned the API of the Canvas class but couldn't find anything useful. I need at least the composite operation "source-in" or (if this isn't possible) "source-atop".

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  • getting started with nosql

    - by radi
    hi , i am new to nosql world i know sql and rdbms very well , i want to get start with nosql so i need to know : where i can start read about nosql (books , online tutorials )? what is the most simple nosql engine i can start with (i am using java)? thanks .

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  • Turing-Complete language possibilities?

    - by I can't tell you my name.
    In every Turing-Complete language, is it possible to create a working Compiler for itself which first runs on an interpreter written in some other language and then compiles it's own source code? (Bootstrapping) Standards-Compilant C++ compiler which outputs binaries for, e.g.: Windows? Regex Parser and Evaluater? World of Warcraft clone? (Assuming the language gets the necessary API bindings as, for example, OpenGL and the WoW source code is available) (Everything here theoretical) Let's take Brainf*ck as an example language.

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  • In Scala, when is (A,A)=>R not equivalent to Function2 ?

    - by Alex R
    I'm trying to define and use my own foreach function. This is in the middle of a larger block of code. But the essence of the error I'm getting is this: test_2.scala:32: error: type mismatch; found : (A, A) = Unit required: Function2 $amount.foreach( (k:A,v:A) = { How is this error conceivably possible? Isn't (A, A) => Unit always a subtype of Function2 regardless of what else might be going on in the code?

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  • Linux Kernel - traverse to buffer heads

    - by CodeRanger
    In the Linux kernel, is there a way to traverse down to the buffer_heads from within a module? I can see how to get to struct bio (task_struct macro: current-bio). But how can I get to the buffer heads? The buffer_head struct holds some information I'd like to obtain at any point regarding physical block numbers.

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  • VS2008 C++ MFC Access Violation ONLY when stepping through debug mode

    - by HotOil
    Hi. This is crazy. It started happening in my main project, so I created a tiny sample brand-new project to reproduce it in and sure enough.. It does NOT happen in a sample project I created that is only a Win32 console app. I'm running this on Win7x64, if that matters. VS2008 SP1. Here goes. I create a small dialog app with a button. Put a breakpoint in the handler function for that button. The button handler function looks like this: void CTestProjectDlg::OnBnClickedButton1() { int i=2; m_csHello.Format(_T("Hello World!")); << breakpoint here UpdateData(FALSE); } Click the button, hit the breakpoint. F10 to step, and boom: "First-chance exception at 0x0398f77b in TestProject.exe: 0xC0000005: Access violation." It gives me the option to Break or Continue. If I Continue, it just hits it again, only not "First Chance". Yes I have that exception checked in the Debug-Exceptions dlg. If I Break, the call stack just shows me the line where the breakpoint is. If I F10 again.. I get the exception again, only now the callstack shows me in the _AfxDispatchCmdMsg() function, and my original OnBnClickedButton1() is not in the callstack anymore. It doesn't matter where I put the breakpoint. If, instead of F10, I just continue with F5, it works normally. Now.. if I build a Release version and run in debugging mode: I hit the breakpoint, and all the pointers, variable values look normal. F10, and these turn to garbage. The this pointer is now zero. The m_csHello is now However, in Release mode, an exception is not caught, and it all runs fine. The "hello World string gets displayed in the dialog box as it should. I have put in an inquiry to see if some patch was installed on my box by the IT dept in the last day or two. This wasn't happening 2 days ago. What do you think? Is VS2008 corrupted? Thanks.

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