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  • What is the performance difference between blocks and callbacks?

    - by Don
    One of the things that block objects, introduced in Snow Leopard, are good for is situations that would previously have been handled with callbacks. The syntax is much cleaner for passing context around. However, I haven't seen any information on the performance implications of using blocks in this manner. What, if any, performance pitfalls should I look out for when using blocks, particularly as a replacement for a C-style callback?

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  • Overlapping and Stacking in CSS

    - by ApacheCode
    Hello, I'm a programmer and learning new techniques in web development. I've ran into a problem if you could look at the link below. http://bailesslaw.com/Bailess_003/bailesHeader/header.html This example I made isnt fixed and it needs to be, which is becoming difficult. This looks fine on here, but when I put those layers on main website, index.html, place this code as the header, the banner moves in the documents position 0,0 . I need these boxes fixed, center page and I cannot get them to do that without messing up the layers order and content. Layer1-rotating images, js causes the rotation Layer2-blue triangle with backdrop effect overlapping layer 1, Layer 3-is a static image with a high z-index Below I including some code, the important part that needs 3 overlapped layers exactly matching in width and height, except it has to be fixed in center 780px wide. Code: <style rel="stylesheet" type="text/css"> div#layer1 { border: 1px solid #000; height: 200px; left: 0px; position: fixed; top: 0px; width: 780px; z-index: 1; } div#layer2 { border: 1px solid #000; height: 200px; left: 0px; position: absolute; top: 0px; width: 780px; z-index: 2; } div#layer3 { border: 1px solid #000000; height: 200px; left: 0px; position: absolute; top: 0px; width: 780px; z-index: 3; } </style> </head> <body class="oneColFixCtr"> <div id="container"> <div id="mainContent"> <div id="layer1"> </div> <div id="layer2"> <div class="slideshow"> <span id="rotating1"> <p class="rotating"> </p> </span> <span id="rotating2"> <p class="rotating"> </p> </span> <span id="rotating3"> <p class="rotating"> </p> </span> <span id="rotating4"> <p class="rotating"> </p> </span> </div> </div> <div id="layer3"> <table width="385" border="0"> <tr> <th width="81" scope="col"> &nbsp; </th> <th width="278" scope="col"> &nbsp; </th> <th width="12" scope="col"> &nbsp; </th> </tr> <tr> <td> &nbsp; </td> <td> </td> <td> &nbsp; </td> </tr> <tr> <td> &nbsp; </td> <td> &nbsp; </td> <td> &nbsp; </td> </tr> </table> </div> </div> <!-- end #container --> </div> </body> </body> </html> CSS: @charset "utf-8"; CSS code: #rotating1 { height: 200px; width: 780px; } #rotating2 { height: 200px; width: 780px; } #rotating3 { height: 200px; width: 780px; } #main { background-repeat: no-repeat; height: 200px; width: 780px; z-index: 100; } #test { width: 780px; z-index: 2; } #indexContent { background-color: #12204d; background-repeat: no-repeat; height: 200px; width: 780px; z-index: 1; } #indexContent p { padding: .5em 2em .5em 2em; text-align: justify; text-indent: 2em; } .rotating { float: right; margin-top: 227px; text-indent: 0px !important; } .clearfix:after { clear: both; content: " "; display: block; font-size: 0; height: 0; visibility: hidden; } .clearfix { display: inline-block; } * html .clearfix { height: 1%; } .clearfix { display: block; }

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  • flowplayer plays the video but won't provide controls

    - by Toni Michel Caubet
    i am trying to use flowplayer to play .swf files this is how i am trying: $(function(){ flowplayer("player", "http://d2p65vgzoeytng.cloudfront.net/comun/0720/video/sol_gavilanes.swf "); }); where <a id="player" href="http://pseudo01.hddn.com/vod/demo.flowplayervod/flowplayer-700.flv" style="display:block;width:425px;height:300px;"></a> Firebug won't log any errors; video is playing but without the player Please check here http://jsfiddle.net/HAVtS/5/ what am i missing?

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  • How to replace a region in emacs with yank buffer contents?

    - by Mad Wombat
    When I use VIM or most modeless editors (Eclipse, NetBeans etc.) I frequently do the following. If I have similar text blocks and I need to change them all, I will change one, copy it (or use non-deleting yank), select next block I need and paste the changed version over it. If I do the same thing in emacs (select region and paste with C-y), it doesn't replace the region, it just pastes at the cursor position. What is the way to do this in emacs?

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  • Library to parse C/C++ source code

    - by John
    Which library should I use to parse C/C++ source code file? I need to parse source file, calculate how much useful strings inside, how much 'for' blocks, 'if' blocks, how much comments inside. I also may need to insert a comment or small piece of code after each 'for' block. Is there any libraries? May be any library included in Microsoft Visual Studio?

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  • trying to show/hide a div but something is not working

    - by Paul
    window.addEvent('domready', function(){ $('detail_block_table').addEvent('click', function(){ if ($('detail_showDiv').getStyle('display') == 'none') { $('detail_showDiv').setStyle('display','block'); } else { $('detail_showDiv').setStyle('display','none'); } }); }); This is the code, it looks fine but something prevents it from working. Any ideas?

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  • generate image of basic figures with perl

    - by jonny
    I am using jalava library as a diagram drawing tool. It displays firgures as images in order to maintain compatibility with majority of browsers. When diagram block is being resized a request is being made and new gif image is generated and send to browser. What I need is generating image of basic blocks, like rounded rectangle, circle, diamond with specified parameters (height, width and color). I want to do all server-side; my server part is written on Perl.

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  • Preferred Options for Webservice to Android

    - by Tim Almond
    I need to get an Android app to interface with an XML webservice (it's really just a request which returns XML), but as the data is large and includes some things I don't need (like a huge description block), I was thinking of transforming it via a server into a format that would be good for Android, and also to be reduced considering it will be used in a low bandwidth area. Does anyone have any suggestions for a good lightweight protocol? I'm especially thinking about libraries for Android that already exist for say REST or even delimited data.

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  • compare time using date command

    - by Andrei
    Say I want a certain block of bash script execute only if it is between 8 am (8:00) and 5 pm (17:00), and do nothing otherwise. The script is running continuously So far I am using date command. How to use it compare it current time within the range? Thanks

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  • two AES implementations generated different encryption results

    - by YCL
    I have an application that uses an opensource "libgcrypt" to encrypt/decrypt a data block (32 bytes). Now I am going to use Microsoft CryptAPI to replace it. My problem is that the libgcrypt and cryptApi approaches generate different ciphertext contents as I use the same AES-256 algoritjm in CFB mode, same key, and same IV, although the ciphertext can be decrypted by their own correspndingly. Could some tell me what is the problem? Thanks.

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  • Executing Multiple Lines in Python

    - by metashockwave
    When Python is first installed, the default setting executes users' code input line-by-line. But sometimes I need to write programs that executes multiple lines at once. Is there a setting in Python where I can change the code execution to one block at once? Thanks if (n/2) * 2 == n:; print 'Even'; else: print 'Odd' SyntaxError: invalid syntax When I tried to run the above code, I got an invalid syntax error on ELSE

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  • XPath select tags by id not descendants of

    - by Stefano
    I have the following code and I have to select all the nodes with id="text" but not the nodes that already have a parent with id="text": test00 test01 test02 * test03 * so in this example the query have to return only the two fo:block with content test00 and test03. Thank you.

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  • Checking if a record in datareader is NULL

    - by user279521
    I have browsed thru other postings on S/O, but I can't find a solution that works for me. I have a datareader that might return a null value, and if so, I want to value to equal blank txtMiddleName.Text = rdrGetUserInfo.GetString(1) ?? ""; The string above does not work. When I walk thru the code, the code jumps to my error trapping block; Any ideas?

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  • Linking to a section of a site that is hidden by a hide/show JavaScript function

    - by hollyb
    I am using a bit of JavaScript to show/hide sections of a site when a tab is clicked. I'm trying to figure out if there is a way I can link back to the page and have a certain tab open based on that link. Here is the JS: var ids=new Array('section1','section2','section3','section4'); function switchid(id, el){ hideallids(); showdiv(id); var li = el.parentNode.parentNode.childNodes[0]; while (li) { if (!li.tagName || li.tagName.toLowerCase() != "li") li = li.nextSibling; // skip the text node if (li) { li.className = ""; li = li.nextSibling; } } el.parentNode.className = "active"; } function hideallids(){ //loop through the array and hide each element by id for (var i=0;i<ids.length;i++){ hidediv(ids[i]); } } function hidediv(id) { //safe function to hide an element with a specified id document.getElementById(id).style.display = 'none'; } function showdiv(id) { //safe function to show an element with a specified id document.getElementById(id).style.display = 'block'; } And the HTML <ul> <li class="active"><a onclick="switchid('section1', this);return false;">One</a></li> <li><a onclick="switchid('section2', this);return false;">Two</a></li> <li><a onclick="switchid('section3', this);return false;">Three</a></li> <li><a onclick="switchid('section4', this);return false;">Four</a></li> </ul> <div id="section1" style="display:block;"> <div id="section2" style="display:none;"> <div id="section3" style="display:none;"> <div id="section4" style="display:none;"> I haven't been able to come up with a way to link back to a specific section. Is it even possible with this method? Thanks!

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  • Can I raise System Error in sql Server in a stored procedure.

    - by Shantanu Gupta
    I am writing a stored procedure where i m using try catch block. Now i have a unique column in a table. When i try to insert duplicate value it throws exception with exception no 2627. I want this to be done like this if (exists(select * from tblABC where col1='value')=true) raiseError(2627)--raise system error that would have thrown if i would have used insert query to insert duplicate value And which method will be better, using insert query or checking for duplicate value before insertion using Select query ?

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  • I get the warning "Format not a string literal and no format arguments" at NSLog -- how can I correc

    - by dsobol
    Hello, I get the warning "Format not a string literal and no format arguments" on the NSLog call in the following block: (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { NSLog([NSString stringWithFormat:@"%d", buttonIndex]); } I have read in another post here that this error message indicates an insecure use of NSLog. Could someone point me in the direction of a properly formatted string for this? Thanks for any and all assistance! Regards, Steve O'Sullivan

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  • hi this is my css horizontal menu i need the submeus for this?

    - by kalaivani
    /* CSS Document */ . rhm1{ width:780px; height:64px; margin:0 auto; background:url(images/rhm1_bg.g if) repeat-x; } .rhm1-left{ background:url(images/rhm1_l.gi f) no-repeat; width:15px; height:64px; float:left; } .rhm1-right{ background:url(images/rhm1_r.gi f) no-repeat; width:15px; height:64px; float:right; } .rhm1-bg{ background:url(images/rhm1_bg.g if) repeat-x; height:64px; } .rhm1-bg ul{ list-style:none; margin:0 auto; } .rhm1-bg li{ float:left; list-style:none; } .rhm1-bg li a{ float:left; display:block; color:#ffe8cc; text-decoration:none; font:12px 'Lucida Sans', sans-serif; font-weight:bold; padding:0 0 0 18px; height:64px; line-height:40px; text-align:center; cursor:pointer; } .rhm1-bg li a span{ float:left; display:block; padding:0 32px 0 18px; } .rhm1-bg li.current a{ color:#fff; background:url(images/rhm1_hove r_l.gif) no-repeat left 5px; } .rhm1-bg li.current a span{ color:#fff; background:url(images/rhm1_hove r_r.gif) no-repeat right 5px; } .rhm1-bg li a:hover{ color:#fff; background:url(images/rhm1_hove r_l.gif) no-repeat left 5px; } .rhm1-bg li a:hover span{ color:#fff; background:url(images/rhm1_hove r_r.gif) no-repeat right 5px; }

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  • How can I fix this touch event / draw loop "deadlock"?

    - by Josh
    Just want to start out by saying this seems like a great site, hope you guys can help! I'm trying to use the structure laid out in LunarLander to create a simple game in which the user can drag some bitmaps around on the screen (the actual game is more complex, but that's not important). I ripped out the irrelevant parts of LanderLander, and set up my own bitmap drawing, something like BoardThread (an inner class of BoardView): run() { while(mRun) { canvas = lockSurfaceHolder... syncronized(mSurfaceHolder) { /* drawStuff using member position fields in BoardView */ } unlockSurfaceHolder } } My drawStuff simply walks through some arrays and throws bitmaps onto the canvas. All that works fine. Then I wanted to start handling touch events so that when the user presses a bitmap, it is selected, when the user unpresses a bitmap, it is deselected, and if a bitmap is selected during a touch move event, the bitmap is dragged. I did this stuff by listening for touch events in the BoardView's parent, BoardActivity, and passing them down into the BoardView. Something like In BoardView handleTouchEvent(MotionEvent e) { synchronized(mSurfaceHolder) { /* Modify shared member fields in BoardView so BoardThread can render the bitmaps */ } } This ALSO works fine. I can drag my tiles around the screen no problem. However, every once in a while, when the app first starts up and I trigger my first touch event, the handleTouchEvent stops executing at the synchronized line (as viewed in DDMS). The drawing loop is active during this time (I can tell because a timer changes onscreen), and it usually takes several seconds or more before a bunch of touch events come through the pipeline and everything is fine again. This doesn't seem like deadlock to me, since the draw loop is constantly going in and out of its syncronized block. Shouldn't this allow the event handling thread to grab a lock on mSurfaceHolder? What's going on here? Anyone have suggestions for improving how I've structured this? Some other info. This "hang" only ever occurs on first touch event after activity start. This includes on orientation change after restoreState has been called. Also, I can remove EVERYTHING within the syncronized block in the event handler, and it will still get hung up at the syncronized call. Thanks!

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  • How to test unescaped &nbsps; as a whitespace

    - by gleery
    I use apache common lang to unescape a block of html text which contains &nbsp;, I want to filter out blocks that contains only whitespaces. But I can't test the   as a whitespace. It's not in the normal whitespace list(http://en.wikipedia.org/wiki/Whitespace_character), and I try to print its Hex form by calling Character.getNumericValue which return -1. &nbsp should be a whitespace,isn't? But How can I test it?

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  • How do I create and read non-global variables that aren't destroyed at end of function?

    - by Paul Reilly
    I am attempting to code some plugins to use with MIDI sequencers but have hit a stumbling block. I can't use global-scope variables to store information because multiple instances of the .dll can exist which share memory. How do I create a class (for re-usability purposes in other plugins) containing 2 dimensional array and other variables the content of which is to be shared between functions? If that is possible, how would I read and write the data from the function in the framework where I do the processing?

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