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• Ping broadcast on Win XP SP3

  - by PaulH

  I'm trying to ping the broadcast address 255.255.255.255 on WinXP SP3. If I use the command line, I get host error: C:\>ping 255.255.255.255 Ping request could not find host 255.255.255.255. Please check the name and try again. If I try a C++ program using the iphlpapi, IcmpSendEcho() fails and GetLastError returns 11010 IP_REQ_TIMED_OUT. HANDLE h = ::IcmpCreateFile(); IPAddr broadcast = inet_addr( "255.255.255.255" ); BYTE payload[ 32 ] = { 0 }; IP_OPTION_INFORMATION option = { 255, 0, 0, 0, 0 }; // a buffer with room for 32 replies each containing the full payload std::vector< BYTE > replies( 32 * ( sizeof( ICMP_ECHO_REPLY ) + 32 ) ); DWORD res = ::IcmpSendEcho( h, broadcast, payload, sizeof( payload ), &option, &replies[ 0 ], replies.size(), 1000 ); ::IcmpCloseHandle( h ); I can ping the local broadcast 192.168.0.255 with no problem. What do I need to do to ping the global broadcast? Thanks, PaulH

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• Incrementing value by one over a lot of rows

  - by Andy Gee

  Edit: I think the answer to my question lies in the ability to set user defined variables in MySQL through PHP - the answer by Multifarious has pointed me in this direction Currently I have a script to cycle over 10M records, it's very slow and it goes like this: I first get a block of 1000 results in an array similar to this: $matches[] = array('quality_rank'=>46732, 'db_id'=>5532); $matches[] = array('quality_rank'=>12324, 'db_id'=>1234); $matches[] = array('quality_rank'=>45235, 'db_id'=>8345); $matches[] = array('quality_rank'=>75543, 'db_id'=>2562); I then cycle through them one by one and update the record $mult = count($matches)*2; foreach($matches as $m) { $rank++; $score = (($m[quality_rank] + $rank)/($mult))*100; $s = "UPDATE `packages_sorted` SET `price_rank` = '".$rank."', `deal_score` = '".$score."' WHERE `db_id` = '".$m[db_id]."' LIMIT 1"; } It seems like this is a very slow way of doing it but I can't find another way to increment the field price_rank by one each time. Can anyone suggest a better method. Note: Although I wouldn't usually store this kind of value in a database I really do need on this occasion for comparison search queries later on in the project. Any help would be kindly appreciated :)

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• Bruteforcing Blackberry PersistentStore?

  - by Haoest

  Hello, I am experimenting with Blackberry's Persistent Store, but I have gotten nowhere so far, which is good, I guess. So I have written a a short program that attempts iterator through 0 to a specific upper bound to search for persisted objects. Blackberry seems to intentionally slow the loop. Check this out: String result = "result: \n"; int ub = 3000; Date start = Calendar.getInstance().getTime(); for(int i=0; i<ub; i++){ PersistentObject o = PersistentStore.getPersistentObject(i); if (o.getContents() != null){ result += (String) o.getContents() + "\n"; } } result += "end result\n"; result += "from 0 to " + ub + " took " + (Calendar.getInstance().getTime().getTime() - start.getTime()) / 1000 + " seconds"; From 0 to 3000 took 20 seconds. Is this enough to conclude that brute-forcing is not a practical method to breach the Blackberry? In general, how secure is BB Persistent Store?

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• Why would an image (the Mandelbrot) be skewed and wrap around?

  - by Sean D

  So I just wrote a little snippet to generate the Mandelbrot fractal and imagine my surprise when it came out all ugly and skewed (as you can see at the bottom). I'd appreciate a point in the direction of why this would even happen. It's a learning experience and I'm not looking for anyone to do it for me, but I'm kinda at a dead end debugging it. The offending generation code is: module Mandelbrot where import Complex import Image main = writeFile "mb.ppm" $ imageMB 1000 mandelbrotPixel x y = mb (x:+y) (0:+0) 0 mb c x iter | magnitude x > 2 = iter | iter >= 255 = 255 | otherwise = mb c (c+q^2) (iter+1) where q = x --Mandelbrot --q = (abs.realPart $ x) :+ (abs.imagPart $ x) --Burning Ship argandPlane x0 x1 y0 y1 width height = [(x,y)| y<-[y1,(y1-dy)..y0], --traverse from x<-[x0,(x0+dx)..x1]] --top-left to bottom-right where dx = (x1 - x0)/width dy = (y1 - y0)/height drawPicture :: (a->b->c)->(c->Colour)->[(a,b)]->Image drawPicture function colourFunction plane = map (colourFunction.uncurry function) plane imageMB s = createPPM s s $ drawPicture mandelbrotPixel (\x->[x,x,x]) $ argandPlane (-1.8) (-1.7) (0.02) 0.055 s' s' where s' = fromIntegral s And the image code (which I'm fairly confident in) is: module Image where type Colour = [Int] type Image = [Colour] createPPM :: Int -> Int -> Image -> String createPPM w h i = concat ["P3 ", show w, " ", show h, " 255\n", unlines.map (unwords.map show) $ i]

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• PHP: How do I rename a directory where the parent directory is variable?

  - by gsquare567

  i would like to move the files inside uploads/pension/#SOME_VARIABLE_NUMBER#/#SOME_CONSTANT_NUMBER#/ here is my code: // move pension statements // located at uploads/pension/%COMPANY_ID%/%USER_ID%/%HASH% // so just move the %USER_ID% folder to the new company $oldPensionDir = "uploads/pension/" . $demo_user[Users::companyID] . "/" . $demo_user[Users::userID] . "/"; $newPensionDir = "uploads/pension/" . $newCompanyID . "/" . $demo_user[Users::userID] . "/"; // see if the user had any files, and if so, move them if(file_exists($oldPensionDir)) { // if it doesnt exist, make it if(!file_exists($newPensionDir)) mkdir($newPensionDir); // move the folder rename($oldPensionDir, $newPensionDir); } however... when i need to make the directory with the "mkdir" function, i get: mkdir() [<a href='function.mkdir'>function.mkdir</a>]: No such file or directory ok, maybe the mkdir won't work, but what about the rename? perhaps that will make the directory if it's not there... nope! rename(uploads/pension/1001/783/,uploads/pension/1000/783/) [<a href='function.rename'>function.rename</a>]: The system cannot find the path specified. (code: 3) so, there are two errors. i'm pretty sure if the renaming works, i won't even need the mkdir, but who knows... can anyone tell me why these are errors and how to fix them? thanks!

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• Why does this threading approach not work?

  - by Tomas Lycken

  I have a wierd problem with threading in an ASP.NET application. For some reason, when I run the code in the request thread, everything works as expected. But when I run it in a separate thread, nothing happens. This is verified by calling the below handler with the three flags "on", "off" and "larma" respectively - in the two first cases everything works, but in the latter nothing happens. What am I doing wrong here? In the web project I have a generic handler with the following code: If task = "on" Then Alarm.StartaLarm(personId) context.Response.Write("Larmet är PÅ") ElseIf task = "off" Then Alarm.StoppaLarm(personId) context.Response.Write("Larmet är AV") ElseIf task = "larma" Then Alarm.Larma(personId) context.Response.Write("Larmar... (stängs av automagiskt)") Else context.Response.Write("inget hände - task: " & task) End If The Alarm class has the following methods: Private Shared Sub Larma_Thread(ByVal personId As Integer) StartaLarm(personId) Thread.Sleep(1000 * 30) StoppaLarm(personId) End Sub Public Shared Sub StartaLarm(ByVal personId As Integer) SandSMS(True, personId) End Sub Public Shared Sub StoppaLarm(ByVal personId As Integer) SandSMS(False, personId) End Sub Public Shared Sub SandSMS(ByVal setOn As Boolean, ByVal personId As Integer) ... End Sub

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• new Date() In javascript :: need Help

  - by gskoli

  Dear all, i am creating a digital clock using images & javascript but i want to pass a server time that time ... How to do that ... I am getting time from server and passing it to Date Following i have given snippet . var time_str = document.clock_form.time_str.value ; //alert (time_str); function dotime(){ theTime=setTimeout('dotime();',1000); //d = new Date(Date.parse(time_str)); d= new Date(time_str); hr= d.getHours()+100; mn= d.getMinutes()+100; se= d.getSeconds()+100; var time_str = document.clock_form.time_str.value ; //alert (time_str); alert(' TIME ---> '+hr+' :: '+mn+' :: '+ se); if(hr==100){ hr=112;am_pm='am'; } else if(hr<112){ am_pm='am'; } else if(hr==112){ am_pm='pm'; } else if(hr>112){ am_pm='pm';hr=(hr-12); } tot=''+hr+mn+se; document.hr1.src = '/flash_files/digits/dg'+tot.substring(1,2)+'.gif'; document.hr2.src = '/flash_files/digits/dg'+tot.substring(2,3)+'.gif'; document.mn1.src = '/flash_files/digits/dg'+tot.substring(4,5)+'.gif'; document.mn2.src = '/flash_files/digits/dg'+tot.substring(5,6)+'.gif'; document.se1.src = '/flash_files/digits/dg'+tot.substring(7,8)+'.gif'; document.se2.src = '/flash_files/digits/dg'+tot.substring(8,9)+'.gif'; document.ampm.src= '/flash_files/digits/dg'+am_pm+'.gif'; } dotime(); But it is not working Help me out Thanks in advance.

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• Javascript Instance Variable Syntax (AJAX page refresh)

  - by Rosarch

  I'm having difficulty with Javascript instance variables. I'm trying to make an easy way to refresh the chat page, looking for new messages. The AJAX call supplies a mid, or the lowest message id to be returned. This allows the call to only ask for the most recent messages, instead of all of them. MessageRefresher.prototype._latest_mid; function MessageRefresher(latest_mid) { this._latest_mid = latest_mid; // it thinks `this` refers to the MessageRefresher object } MessageRefresher.prototype.refresh = function () { refreshMessages(this._latest_mid); // it thinks `this` refers to the window this._latest_mid++; } function refreshMessages(latest_mid) { $.getJSON('API/read_messages', { room_id: $.getUrlVar('key'), mid: latest_mid }, function (messages) { for (var i = 0; i < messages[0].length; i++) { var newChild = sprintf("<li>%s: %s</li>", messages[1][i], messages[0][i]); $("#messages").append(newChild); } }); var messageRefresher = new MessageRefresher(0); setInterval(messageRefresher.refresh, 1000); This results in all the messages being printed out, over and over again. I know it has other bugs, but the main issue I'm trying to work out right now is the use of the instance variable. Or is there another way I should be going about doing this?

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• Start developing a database application using Oracle + Net Beans

  - by Ranhiru

  I have thought of creating my first database application for one of my projects using Oracle and Java. I have chosen Netbeans as my development environment. I have a few questions to getting started. Please bare with me as I'm a complete beginner to Oracle + Netbeans This will be a data intensive (yet still for a college project) database application. I do not need 1000 user concurrency or any other very advanced features but basic stuff such as triggers, stored procedures etc. Will the 11g "Express" (XE) suffice for my requirements? Do i need any Java to Oracle bridge (database connectivity driver eg. ODBC etc) for Netbeans to connect to the oracle database? If yes, what are they? Does Netbeans support Oracle databases natively? Any easy to follow guide on how do i connect to the database and insert/retrieve/display data on a J2SE application? (I know that i should Google this but if there's any guide previously followed by anyone and is considered easy, it would be greatly appreciated.)

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• Vector does reallocation on every push_back

  - by Amrish

  IDE - Visual Studio 2008, Visual C++ I have a custom class Class1 with a copy constructor to it. I also have a vector Data is inserted using the following code Class1* objClass1; vector<Class1> vClass1; for(int i=0;i<1000;i++) { objClass1 = new Class1(); vClass1.push_back(*objClass1); delete objClass1; } Now on every insert, the vector gets re-allocated and all the existing contents are copied to new locations. For example, if the vector has 5 elements and if I insert the 6th one, the previous 5 elements along with the new one gets copied to a new location (I figured it out by adding log statements in the copy constructors.) On using reserve(), this however does not happen as expected! I have the following questions Is it mandatory to always use the reserve statement? Does vector does a reallocation every time I do a push_back; or does it happen because I am debugging?

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• In XSLT, how can you sort using an indirect key?

  - by edholder

  I am having trouble getting xsl:sort to understand the scope of the attributes I am referencing. Here is an XML sample document to illustrate: <Root> <DrinkSelections> <Drink id=1000 name="Coffee"/> <Drink id=1001 name="Water"/> <Drink id=1002 name="Tea"/> <Drink id=1003 name="Almost But Not Quite Entirely Unlike Tea"/> </DrinkSelections> <CustomerOrder> <Drinks> <Drink oid="1001"/> <Drink oid="1002"/> <Drink oid="1003"/> </Drinks> </CustomerOrder </Root> I want to produce a list of drinks (sorted by name) contained in the CustomerOrder. Here is the XSLT code I am fiddling with: <xsl:for-each select="/Root/CustomerOrder/Drinks/Drink"> <xsl:sort select="/Root/DrinkSelections/Drink[@id = @oid]/@name"/> <xsl:variable name=var_oid select="@oid"/> <xsl:value-of select="/Root/DrinkSelections/Drink[@id = $var_oid]/@name"/> </xsl:for-each> Apparently, the xsl:sort command is trying to apply the "oid" attribute to the Drink elements in DrinkSelections, rather than local Drink element. I can get around this using a variable, as in the xsl:value-of statement. But since xsl:sort must be the first statement after the xsl:for-each statement, I can't insert the xsl:variable statement before xsl:sort. Is there a way to explicitly state that the attribute value should be taken from the "local" element?

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• Google Chrome is doing things wrong again

  - by Stefan Liebenberg

  Chrome is wrongly reporting width and height values for images during, or just after, load time. Jquery is used in this code example: <img id='image01' alt='picture that is 145x134' src='/images/picture.jpg' /> <script> var img = $( 'img#image01' ) img.width() // would return 145 in Firefox and 0 in Chrome. img.height() // would return 134 in Firefox and 0 in Chrome. </script> If you put the script in a onload function, the result is the same. but if you run the code a few seconds after the page has loaded, chrome returns the correct result. <script> function example () { var img = $( 'img#image01' ); img.width() // returns 145 in both Firefox and Chrome. img.height() // returns 134 in both Firefox and Chrome. } window.setTimeout( example, 1000 ) </script> Also if you specify the width and height values in the img tag, the script seems to work as expected in both Firefox and Chrome. <img id='image01' src='/images/picture.jpg' width=145 height=134 /> But as you cannot always control the html input, this is not an ideal workaround. Can jQuery be patched with a better workaround for this problem? or will I need to specify the width and height for every image in my code?

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• Problem finding the difference in days between two dates

  - by James

  I have been using a tidy little routine that I found here to calculate the difference in days between two dates in AS3. I am getting some strange results and I am wondering if any of you inter-codal-mega-lords can shed some light? Why is Q1 of 2010 coming up one day short, when in all other cases the routine is performing fine? Many thanks in advance to anyone who can help! function countDays( startDate:Date, endDate:Date ):int { var oneDay:int = 24*60*60*1000; // hours*minutes*seconds*milliseconds var diffDays:int = Math.abs((startDate.getTime() - endDate.getTime())/(oneDay)); return diffDays; } countDays( new Date( 2010, 00, 01 ), new Date( 2011, 00, 01 ) ); // returns 365, which is correct countDays( new Date( 2010, 00, 01 ), new Date( 2010, 03, 01 ) ); // returns 89, which is 1 day short countDays( new Date( 2010, 03, 01 ), new Date( 2010, 06, 01 ) ); // returns 91, which is correct countDays( new Date( 2010, 06, 01 ), new Date( 2010, 09, 01 ) ); // returns 92, which is correct countDays( new Date( 2010, 09, 01 ), new Date( 2011, 00, 01 ) ); // returns 92, which is correct

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• Form submits but by passing the form validation when button.click is used

  - by Cuty Pie

  I am using form validation plugin as well as html5 attribute=recquired with input type=button or submit and fancybox.when button is clicked ,both validation proceedures work(notification of empty inputs appeare),but instead of this notification ,form is submitted. If I dont use button.click function but use simple submit.then validation works perfectly plugin==http://validatious.org/ javascript function $(document).ready(function() { $('#send').click(function() { $(this).attr("value", 'Applying...'); var id = getParam('ID'); $.ajax({ type:'POST', url:"send.php", data:{option:'catapply', tittle:$('#tittle').val(), aud:aud, con:con, adv:adv, mid:$('#mid').val(), aud2:aud, cid:$('#cid').val(), scid:$('#scname option[selected="saa"]').val(), gtt:$('input[name=gt]:radio:checked').val(), sr:$(":input").serialize() + '&aud=' + aud}, success:function(jd) { $('#' + id).fadeOut("fast", function() { $(this).before("<strong>Success! Your form has been submitted, thanks :)</strong>"); setTimeout("$.fancybox.close()", 1000); }); } }); }); }); AND Html is here <form id="form2" class="validate" style="display: none" > <input type='submit' value='Apply' id="send" class="sendaf validate_any" name="jobforming"/>

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• Extending / changing how Zend_Search_Lucene searches

  - by Grant Collins

  Hi, I am currently using Zend_Search_Lucene to index and search a number of documents currently at around a 1000 or so. What I would like to do is change how the engine scores hits on a document, from the current default. Zend_Search_Lucene scores on the frequency of number of hits within a document, so a document that has 10 matches of the word PHP will score higher than a document with only 3 matches of PHP. What I am trying to do is pass a number of key words and score depending on the hits of those keywords. e.g. I pass 5 key words say,PHP, MySQL, Javascript, HTML and CSS that I search against the index. One document has 3 matches to those key words and one document has all 4 matches, the 4 matches scores the highest. The number of instances of those words in the document do not concern me. Now I've had a quick look at Zend_Search_Lucene_Search_Similarity however I have to confess that I am not sure (or that bright) to know how to use this to achieve what I am after. Is what I want to do possible using Lucene or is there a better solution out there?

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• call back function set by JS settimeout doesn't work in IE8....

  - by NAG

  <html <head <script function addEvent( obj, type, fn ) { if ( obj.attachEvent ) { obj['e'+type+fn] = fn; obj[type+fn] = function(){obj['e'+type+fn]( window.event );} obj.attachEvent( 'on'+type, obj[type+fn] ); } else obj.addEventListener( type, fn, false ); } </script </head <body <!-- HTML for example event goes here -- <div id="mydiv" style="border: 1px solid black; width: 100px; height: 100px; margin-top: 10px;"</div <script // Script for example event goes here addEvent(document.getElementById('mydiv'), 'contextmenu', function(event) { display_short('right-clicked (contextmenu)'); }); function display_short(str) { clearTimeout(); document.getElementById('mydiv').innerHTML = str; if (str != '') alert("hello"); setTimeout("display_short('abcd')", 1000); } </script </body </html Behaves diffrently in IE and FF when you right click on the div area. In ff display_short will be called for evry 1 sec eventhough you dont release right click but in IE it will not call display_short if you dont release right click. But i expect in IE it should call display_short for every 1 sec if you dont release also. Is there any solution for this?

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• Proper QUuid usage in Qt ? (7-Zip DLL usage problems (QLibrary, QUuid GUID conversion, interfaces))

  - by whipsnap

  Hi, I'm trying to write a program that would use 7-Zip DLL for reading files from inside archive files (7z, zip etc). Here's where I'm so far: #include QtCore/QCoreApplication #include QLibrary #include QUuid #include iostream using namespace std; #include "7z910/CPP/7zip/Archive/IArchive.h" #include "7z910/CPP/7zip/IStream.h" #include "MyCom.h" // {23170F69-40C1-278A-1000-000110070000} QUuid CLSID_CFormat7z(0x23170F69, 0x40C1, 0x278A, 0x10, 0x00, 0x00, 0x01, 0x10, 0x07, 0x00, 0x00); typedef int (*CreateObjectFunc)( const GUID *clsID, const GUID *interfaceID, void **outObject); void readFileInArchive() { QLibrary myLib("7z.dll"); CreateObjectFunc myFunction = (CreateObjectFunc)myLib.resolve("CreateObject"); if (myFunction == 0) { cout outArchive; myFunction(&CLSID_CFormat7z, &IID_IOutArchive, (void **)&outArchive); } int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); readFileInArchive(); return a.exec(); } Trying to build that in Qt Creator will lead to following error: cannot convert 'QUuid*' to 'const GUID*' in argument passing How should QUuid be correctly used in this context? Also, being a C++ and Qt newbie I haven't yet quite grasped templates or interfaces, so overall I'm having trouble getting through these first steps. If someone could give tips or even example code on how for example an image file could be extracted from ZIP file (to be shown in Qt GUI later on*), I would highly appreciate that. My main goal at the moment is to write a program with GUI for selecting archive files containing image files (PNG, JPG etc) and displaying those files one at a time in the GUI. A Qt based CDisplayEx in short.

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• How do you use glFrustrum in OpenGL ES1 on iPhone

  - by Paul

  So I am using Xcode 3.2.1 and am trying to make an iPhone OpenGL ES1 project. The default template for an opengl project is ok, but I have been trying to split the code up so not everything is done per frame on the drawView() call. I have a seperate setupRC method that sets the lighting, turns on depth test, turns on culling and sets the clear color. This is called on the init of the EAGLView and this works just fine. I have took the glViewport() and glFrustrum() calls and put them at the end of the resizeFromLayer() method in the ES1Renderer.m file. This gets hit when the app starts and when the app gets resized as it should. Now the problem is the frustrum's far seems to be messed up, as in all my objects get cut / clipped off. I tried adjusting the camera position and angle and it still all objects are cut / clipped. I increased the far from 1000.0f to 30000.0f and still get the same result. What is crazy is that if i call both the glViewport() and glFrustrum() calls in the drawView() every frame everything looks right. Nothing is clipped and looks like i want it. From everything I've been reading the frustrum and viewport calls only need to be called when the window / gets made and resizes, but If I don't call it every frame in my project it doesn't work. Any ideas? Thanks In Advance

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• Why is my code stopping and not returning an exception?

  - by BeckyLou

  I have some code that starts a couple of threads to let them execute, then uses a while loop to check for the current time passing a set timeout period, or for the correct number of results to have been processed (by checking an int on the class object) (with a Thread.Sleep() to wait between loops) Once the while loop is set to exit, it calls Abort() on the threads and should return data to the function that calls the method. When debugging and stepping through the code, I find there can be exceptions in the code running on the separate threads, and in some cases I handle these appropriately, and at other times I don't want to do anything specific. What I have been seeing is that my code goes into the while loop and the thread sleeps, then nothing is returned from my function, either data or an exception. Code execution just stops completely. Any ideas what could be happening? Code sample: System.Threading.Thread sendThread = new System.Threading.Thread(new System.Threading.ThreadStart(Send)); sendThread.Start(); System.Threading.Thread receiveThread = new System.Threading.Thread(new System.Threading.ThreadStart(Receive)); receiveThread.Start(); // timeout Int32 maxSecondsToProcess = this.searchTotalCount * timeout; DateTime timeoutTime = DateTime.Now.AddSeconds(maxSecondsToProcess); Log("Submit() Timeout time: " + timeoutTime.ToString("yyyyMMdd HHmmss")); // while we're still waiting to receive results & haven't hit the timeout, // keep the threads going while (resultInfos.Count < this.searchTotalCount && DateTime.Now < timeoutTime) { Log("Submit() Waiting..."); System.Threading.Thread.Sleep(10 * 1000); // 1 minute } Log("Submit() Aborting threads"); // <== this log doesn't show up sendThread.Abort(); receiveThread.Abort(); return new List<ResultInfo>(this.resultInfos.Values);

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• How do I capture keystrokes on the web?

  - by Sean

  Using PHP, JS, or HTML (or something similar) how would I capture keystokes? Such as if the user presses ctrl+f or maybe even just f, a certain function will happen. ++++++++++++++++++++++++EDIT+++++++++++++++++++ Ok, so is this correct, because I can't get it to work. And I apologize for my n00bness is this is an easy question, new to jQuery and still learning more and more about JS. <script> var element = document.getElementById('capture'); element.onkeypress = function(e) { var ev = e || event; if(ev.keyCode == 70) { alert("hello"); } } </script> <div id="capture"> Hello, Testing 123 </div> ++++++++++++++++EDIT++++++++++++++++++ Here is everything, but I can't get it to work: <link rel="icon" href="favicon.ico" type="image/x-icon"> <style> * { margin: 0px } div { height: 250px; width: 630px; overflow: hidden; vertical-align: top; position: relative; background-color: #999; } iframe { position: absolute; left: -50px; top: -130px; } </style> <script> document.getElementsByTagName('body')[0].onkeyup = function(e) { var ev = e || event; if(ev.keyCode == 70 && ev.ctrlKey) { //control+f alert("hello"); } } </script> <div id="capture"> Hello, Testing 123<!--<iframe src="http://www.pandora.com/" scrolling="no" width="1000" height="515"frameborder="0"></iframe>--> </div>

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• GetIpAddrTable() leaks memory. How to resolve that?

  - by Stabledog

  On my Windows 7 box, this simple program causes the memory use of the application to creep up continuously, with no upper bound. I've stripped out everything non-essential, and it seems clear that the culprit is the Microsoft Iphlpapi function "GetIpAddrTable()". On each call, it leaks some memory. In a loop (e.g. checking for changes to the network interface list), it is unsustainable. There seems to be no async notification API which could do this job, so now I'm faced with possibly having to isolate this logic into a separate process and recycle the process periodically -- an ugly solution. Any ideas? // IphlpLeak.cpp - demonstrates that GetIpAddrTable leaks memory internally: run this and watch // the memory use of the app climb up continuously with no upper bound. #include <stdio.h> #include <windows.h> #include <assert.h> #include <Iphlpapi.h> #pragma comment(lib,"Iphlpapi.lib") void testLeak() { static unsigned char buf[16384]; DWORD dwSize(sizeof(buf)); if (GetIpAddrTable((PMIB_IPADDRTABLE)buf, &dwSize, false) == ERROR_INSUFFICIENT_BUFFER) { assert(0); // we never hit this branch. return; } } int main(int argc, char* argv[]) { for ( int i = 0; true; i++ ) { testLeak(); printf("i=%d\n",i); Sleep(1000); } return 0; }

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• What is the best way to remove flickering from a fast series of image loads in Flash?

  - by msandbot

  Hi, working on making a flash program that loads about 1000 jpegs and then plays them like a movie. Have all the buttons and stuff working but the time it takes for an image to load is so high that the movie can't be played at 30 fps. I've tried multiple ways of fixing this using 1 scrollpane and changing its source ever 30 ms. This one is the worst but simplest. Flickers cause strobing and it is unwatchable. used 2 scrollpanes that were duplicates of each other until I had to load. I would then make that one invisible, load it , then make it visible. Then load the background one. Works but same problem as the first at high speeds, just less severe. used 1 scrollpane per image . This works great, except that it fails miserably on any more than 100 of them due to the number of objects. Has anyone else experienced/solved/wants to help me solve this? None of my fixes have worked. Currently using action script 3, but will change if its not possible in that. Also, I want to be able to zoom in and then scroll around the window hence the scrollpanes, but if that's not possible its a sacrifice I'm willing to make

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• JSP getParameter problem

  - by user236501

  I have a form, if the timer reach the form will auto redirect to the Servlet to update database. My problem now is if javascript redirect the window to servlet my request.getParameter is null. function verify(f,whichCase){ if(whichCase == "Submit"){ msg = "Are you sure that you want to submit this test?"; var i = confirm(msg) if(i){ parent.window.location = "sindex.jsp" } return i; } } I doing this because i got a iframe in my jsp. Timer update problem have to use iframe. So, when time up or user click submit parent.window.location can let me refresh parent window <form method="POST" action="${pageContext.request.contextPath}/TestServlet" onSubmit="return verify(this,whichPressed)"> My form when user click submit button within the timing, it will trigger the verify function to let user confirm submit. So inside my TestServlet i got this, because using javascript redirect request.getParameter("answer") this keep return me null. protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (request.getParameter("Submit") != null) { String ans = request.getParameter("answer"); Answer a = new Answer(ans, no); aa.CreateAnswer(an,t.getTestCode(),username); RequestDispatcher rd = request.getRequestDispatcher("/sindex.jsp"); rd.forward(request, response); } } Below are my timer when time up redirect to TestServlet trigger the doGet method if((mins == 0) && (secs == 0)) { window.alert("Time is up. Press OK to submit the test."); // change timeout message as required var sUrl = "TestServlet"; parent.window.location = sUrl // redirects to specified page once timer ends and ok button is pressed } else { cd = setTimeout("redo()",1000); }

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• Unit Testing an Event Firing From a Thread

  - by Dougc

  I'm having a problem unit testing a class which fires events when a thread starts and finishes. A cut down version of the offending source is as follows: public class ThreadRunner { private bool keepRunning; public event EventHandler Started; public event EventHandler Finished; public void StartThreadTest() { this.keepRunning = true; var thread = new Thread(new ThreadStart(this.LongRunningMethod)); thread.Start(); } public void FinishThreadTest() { this.keepRunning = false; } protected void OnStarted() { if (this.Started != null) this.Started(this, new EventArgs()); } protected void OnFinished() { if (this.Finished != null) this.Finished(this, new EventArgs()); } private void LongRunningMethod() { this.OnStarted(); while (this.keepRunning) Thread.Sleep(100); this.OnFinished(); } } I then have a test to check that the Finished event fires after the LongRunningMethod has finished as follows: [TestClass] public class ThreadRunnerTests { [TestMethod] public void CheckFinishedEventFiresTest() { var threadTest = new ThreadRunner(); bool finished = false; object locker = new object(); threadTest.Finished += delegate(object sender, EventArgs e) { lock (locker) { finished = true; Monitor.Pulse(locker); } }; threadTest.StartThreadTest(); threadTest.FinishThreadTest(); lock (locker) { Monitor.Wait(locker, 1000); Assert.IsTrue(finished); } } } So the idea here being that the test will block for a maximum of one second - or until the Finish event is fired - before checking whether the finished flag is set. Clearly I've done something wrong as sometimes the test will pass, sometimes it won't. Debugging seems very difficult as well as the breakpoints I'd expect to be hit (the OnFinished method, for example) don't always seem to be. I'm assuming this is just my misunderstanding of the way threading works, so hopefully someone can enlighten me.

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• javascript watching for variable change via a timer

  - by DA

  I have a slide show where every 10 seconds the next image loads. Once an image loads, it waits 10 seconds (setTimeout) and then calls a function which fades it out, then calls the function again to fade in the next image. It repeats indefinitely. This works. However, at times, I'm going to want to over-ride this "function1 call - pause - function2 call - function1 call" loop outside of this function (for instance, I may click on a slide # and want to jump directly to that slide and cancel the current pause). One solution seems to be to set up a variable, allow other events to change that variable and then in my original function chain, check for any changes before continuing the loop. I have this set up: var ping = 500; var pausetime = 10000; for(i=0; i<=pausetime; i=i+ping){ setTimeout(function(){ console.log(gocheckthevariable()); console.log(i); pseudoIf('the variable is true AND the timer is done then...do the next thing') },i) } The idea is that I'd like to pause for 10 seconds. During this pause, every half second I'll check to see if this should be stopped. The above will write out to the console the following every half second: true 10000 true 10000 true 10000 etc... But what I want/need is this: true 0 true 500 true 1000 etc... The basic problem is that the for loop executes before each of the set timeouts. While I can check the value of the variable every half second, I can't match that against the current loop index. I'm sure this is a common issue, but I'm at a loss what I should actually be searching for.

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