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• how to use WaitForSingleobject

  - by Tyzak

  hello in order to try out how to programm with the win32 api i wrote a programm that creates a process. then i want to check if my proccess waits for the new created process, close the handle and then check waitforsingle obj. again. (the seconde process is sleeping for 700 ms) first process: #include <iostream> #include <windows.h> #include <string> using namespace std; void main() { bool ret; bool retwait; STARTUPINFO startupinfo; GetStartupInfo (&startupinfo); PROCESS_INFORMATION pro2info; wchar_t wcsCommandLine[] = L"D:\\betriebssystemePRA1PRO2.exe"; ret = CreateProcess(NULL, wcsCommandLine, NULL, NULL, false, CREATE_NEW_CONSOLE, NULL, NULL, &startupinfo, &pro2info); cout<<"hProcess: "<<pro2info.hProcess<<endl; cout<<"dwProcessId: "<<pro2info.dwProcessId <<endl; if (retwait= WaitForSingleObject (pro2info.hProcess, INFINITE)==true) cout<<"waitprocess:true"<<endl; //prozess ist fertig else cout<<"waitprocess:false"<<endl; CloseHandle (pro2info.hProcess);//prozesshandle schließen, "verliert connection" if (retwait= WaitForSingleObject (pro2info.hProcess, INFINITE)==true)//wenn der prozess fertig ist cout<<"waitprocess:true"<<endl; else cout<<"waitprocess:false"<<endl; //cout<<GetLastError()<<endl; //gibt den letzten fehler aus ExitProcess(0); } seconde process: #include <iostream> #include <windows.h> #include <string> using namespace std; void main() { int b; b=GetCurrentProcessId(); cout<<b<<endl; cout<<"Druecken Sie Enter zum Beenden"<<endl; cin.get(); //warten bis Benutzer bestätigt Sleep (700); ExitProcess(0); cout<<"test"; } the first process prints false, false ; but it should print true, false. instead of the if-else statement is used this: //switch(WaitForSingleObject (pro2info.hProcess, INFINITE)){ // case WAIT_OBJECT_0: cout << "ja"; // break; // case WAIT_FAILED:cout << "nein"; // break; // case WAIT_TIMEOUT: // break; //} // cout<<"waitprocess:true"<<endl;//prozess ist fertig //else // cout<<"waitprocess:false"<<endl; and this seems to work. what did i wrong with my if-else statement? thanks in advance

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• Generating strongly biased radom numbers for tests

  - by nobody

  I want to run tests with randomized inputs and need to generate 'sensible' random numbers, that is, numbers that match good enough to pass the tested function's preconditions, but hopefully wreak havoc deeper inside its code. math.random() (I'm using Lua) produces uniformly distributed random numbers. Scaling these up will give far more big numbers than small numbers, and there will be very few integers. I would like to skew the random numbers (or generate new ones using the old function as a randomness source) in a way that strongly favors 'simple' numbers, but will still cover the whole range, I.e. extending up to positive/negative infinity (or ±1e309 for double). This means: numbers up to, say, ten should be most common, integers should be more common than fractions, numbers ending in 0.5 should be the most common fractions, followed by 0.25 and 0.75; then 0.125, and so on. A different description: Fix a base probability x such that probabilities will sum to one and define the probability of a number n as xk where k is the generation in which n is constructed as a surreal number1. That assigns x to 0, x2 to -1 and +1, x3 to -2, -1/2, +1/2 and +2, and so on. This gives a nice description of something close to what I want (it skews a bit too much), but is near-unusable for computing random numbers. The resulting distribution is nowhere continuous (it's fractal!), I'm not sure how to determine the base probability x (I think for infinite precision it would be zero), and computing numbers based on this by iteration is awfully slow (spending near-infinite time to construct large numbers). Does anyone know of a simple approximation that, given a uniformly distributed randomness source, produces random numbers very roughly distributed as described above? I would like to run thousands of randomized tests, quantity/speed is more important than quality. Still, better numbers mean less inputs get rejected. Lua has a JIT, so performance can't be reasonably predicted. Jumps based on randomness will break every prediction, and many calls to math.random() will be slow, too. This means a closed formula will be better than an iterative or recursive one. 1 Wikipedia has an article on surreal numbers, with a nice picture. A surreal number is a pair of two surreal numbers, i.e. x := {n|m}, and its value is the number in the middle of the pair, i.e. (for finite numbers) {n|m} = (n+m)/2 (as rational). If one side of the pair is empty, that's interpreted as increment (or decrement, if right is empty) by one. If both sides are empty, that's zero. Initially, there are no numbers, so the only number one can build is 0 := { | }. In generation two one can build numbers {0| } =: 1 and { |0} =: -1, in three we get {1| } =: 2, {|1} =: -2, {0|1} =: 1/2 and {-1|0} =: -1/2 (plus some more complex representations of known numbers, e.g. {-1|1} ? 0). Note that e.g. 1/3 is never generated by finite numbers because it is an infinite fraction – the same goes for floats, 1/3 is never represented exactly.

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• Scroll Position in a Table Body

  - by Craig Walker

  I want to implement infinite scrolling (with an AJAX-based loader) in an HTML table body. My HTML looks something like this: <table> <thead> <tr><th>Column</th></tr> </thead> <tbody> <tr><td>Row 1</td></tr> <tr><td>Row 2</td></tr> </tbody> </table> I get a scroll bar on the <tbody> like so: tbody { height:10em; /* Otherwise the tbody expands to fit all rows */ overflow:auto; } To be able to do anything when the user scrolls to the bottom, I need to be able to get the scroll position of the <tbody>. In all of the (jQuery) infinite scroll implementations I've seen (such as this one), they subtract the content height from the container height and compare it to the .scrollTop() value. Unfortunately this may not work with <tbody>, which is both the viewport and the container for the scrolled content. $("tbody").height() returns the viewable (ie: "shrunken") size, but I don't know how I can get the full (viewable + hidden) size of the table body. (FWIW, $("tbody").scrollTop() returns a "large" number when scrolled to the bottom, exactly as I would expect it to). Is there any way to accomplish this?

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• Can someone please explain this lazy evaluation code?

  - by Tejs

  So, this question was just asked on SO: http://stackoverflow.com/questions/2740001/how-to-handle-an-infinite-ienumerable My sample code: public static void Main(string[] args) { foreach (var item in Numbers().Take(10)) Console.WriteLine(item); Console.ReadKey(); } public static IEnumerable<int> Numbers() { int x = 0; while (true) yield return x++; } Can someone please explain why this is lazy evaluated? I've looked up this code in Reflector, and I'm more confused than when I began. Reflector outputs: public static IEnumerable<int> Numbers() { return new <Numbers>d__0(-2); } For the numbers method, and looks to have generated a new type for that expression: [DebuggerHidden] public <Numbers>d__0(int <>1__state) { this.<>1__state = <>1__state; this.<>l__initialThreadId = Thread.CurrentThread.ManagedThreadId; } This makes no sense to me. I would have assumed it was an infinite loop until I put that code together and executed it myself.

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• System.Threading.Timer keep reference to it.

  - by Daniel Bryars

  According to [http://msdn.microsoft.com/en-us/library/system.threading.timer.aspx][1] you need to keep a reference to a System.Threading.Timer to prevent it from being disposed. I've got a method like this: private void Delay(Action action, Int32 ms) { if (ms <= 0) { action(); } System.Threading.Timer timer = new System.Threading.Timer( (o) => action(), null, ms, System.Threading.Timeout.Infinite); } Which I don't think keeps a reference to the timer, I've not seen any problems so far, but that's probably because the delay periods used have been pretty small. Is the code above wrong? And if it is, how to I keep a reference to the Timer? I'm thinking something like this might work: class timerstate { internal volatile System.Threading.Timer Timer; }; private void Delay2(Action action, Int32 ms) { if (ms <= 0) { action(); } timerstate state = new timerstate(); lock (state) { state.Timer = new System.Threading.Timer( (o) => { lock (o) { action(); ((timerstate)o).Timer.Dispose(); } }, state, ms, System.Threading.Timeout.Infinite); } The locking business is so I can get the timer into the timerstate class before the delegate gets invoked. It all looks a little clunky to me. Perhaps I should regard the chance of the timer firing before it's finished constructing and assigned to the property in the timerstace instance as negligible and leave the locking out.

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• Machine Learning Algorithm for Predicting Order of Events?

  - by user213060

  Simple machine learning question. Probably numerous ways to solve this: There is an infinite stream of 4 possible events: 'event_1', 'event_2', 'event_4', 'event_4' The events do not come in in completely random order. We will assume that there are some complex patterns to the order that most events come in, and the rest of the events are just random. We do not know the patterns ahead of time though. After each event is received, I want to predict what the next event will be based on the order that events have come in in the past. The predictor will then be told what the next event actually was: Predictor=new_predictor() prev_event=False while True: event=get_event() if prev_event is not False: Predictor.last_event_was(prev_event) predicted_event=Predictor.predict_next_event(event) The question arises of how long of a history that the predictor should maintain, since maintaining infinite history will not be possible. I'll leave this up to you to answer. The answer can't be infinte though for practicality. So I believe that the predictions will have to be done with some kind of rolling history. Adding a new event and expiring an old event should therefore be rather efficient, and not require rebuilding the entire predictor model, for example. Specific code, instead of research papers, would add for me immense value to your responses. Python or C libraries are nice, but anything will do. Thanks! Update: And what if more than one event can happen simultaneously on each round. Does that change the solution?

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• problem when trying to empty a stack in c

  - by frx08

  Hi all, (probably it's a stupid thing but) I have a problem with a stack implementation in C language, when I try to empty it, the function to empty the stack does an infinite loop.. the top of the stack is never null. where I commit an error? thanks bye! #include <stdio.h> #include <stdlib.h> typedef struct stack{ size_t a; struct stack *next; } stackPos; typedef stackPos *ptr; void push(ptr *top, size_t a){ ptr temp; temp = malloc(sizeof(stackPos)); temp->a = a; temp->next = *top; *top = temp; } void freeStack(ptr *top){ ptr temp = *top; while(*top!=NULL){ //the program does an infinite loop *top = temp->next; free(temp); } } int main(){ ptr top = NULL; push(&top, 4); push(&top, 8); //down here the problem freeStack(&top); return 0; }

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• wxPython, Threads, and PostEvent between modules

  - by Sam Starling

  I'm relatively new to wxPython (but not Python itself), so forgive me if I've missed something here. I'm writing a GUI application, which at a very basic level consists of "Start" and "Stop" buttons that start and stop a thread. This thread is an infinite loop, which only ends when the thread is stopped. The loop generates messages, which at the moment are just output using print. The GUI class and the infinite loop (using threading.Thread as a subclass) are held in separate files. What is the best way to get the thread to push an update to something like a TextCtrl in the GUI? I've been playing around with PostEvent and Queue, but without much luck. Here's some bare bones code, with portions removed to keep it concise: main_frame.py import wx from loop import Loop class MainFrame(wx.Frame): def __init__(self, parent, title): # Initialise and show GUI # Add two buttons, btnStart and btnStop # Bind the two buttons to the following two methods self.threads = [] def onStart(self): x = Loop() x.start() self.threads.append(x) def onStop(self): for t in self.threads: t.stop() loop.py class Loop(threading.Thread): def __init__(self): self._stop = threading.Event() def run(self): while not self._stop.isSet(): print datetime.date.today() def stop(self): self._stop.set() I did, at one point, have it working by having the classes in the same file by using wx.lib.newevent.NewEvent() along these lines. If anyone could point me in the right direction, that'd be much appreciated.

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• Safari openwindow function behavior on iPad versus iPhone

  - by CodeLizard

  An identical javascript:openwindow call with a link to Google maps opens in Safari on the iPad but in the Google Maps App on the iPhone. Why the difference? <html> <head> </head> <body> <a title="View an area map for this property" href="javascript:openwindow ('http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=1+Infinite+Loop, +Cupertino,+CA%E2%80%8E&sll=37.329389, -122.029696&sspn=0.015714,0.033023&ie=UTF8&hq=&hnear=1+Infinite+Loop, +Cupertino,+Santa+Clara, +California+95014&ll=37.331539, -122.030704&spn=0.007857,0.016512&z=17&ssa=1', 760, 500,'yes', 'yes')"> <font face="arial,helvetica" color="#000000" size="-1">Map It</font> </a> </body> <script> function openwindow(url,width,height,resizable,scrollbars,posx,posy) { if(posx==null)posx=20; if(posy==null)posy=20; now=new Date(); var x_offset=0; var y_offset=0; try { if(window.screen.left != undefined && window.screen.top != undefined) { x_offset=window.screen.left; y_offset=window.screen.top; } }catch(e){} var window_x=posx+x_offset; var window_y=posy+y_offset; new_window=window.open(url,now.getTime(),'width='+width+',height='+height+', resizable='+resizable+',scrollbars='+scrollbars+',top='+window_y+', left='+window_x+',screenX='+window_x+',screenY='+window_y); if(!new_window.opener) new_window.opener=self; try { new_window.focus(); }catch(e){} } </script> </html>

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• Which linear programming package should I use for high numbers of constraints and "warm starts"

  - by davidsd

  I have a "continuous" linear programming problem that involves maximizing a linear function over a curved convex space. In typical LP problems, the convex space is a polytope, but in this case the convex space is piecewise curved -- that is, it has faces, edges, and vertices, but the edges aren't straight and the faces aren't flat. Instead of being specified by a finite number of linear inequalities, I have a continuously infinite number. I'm currently dealing with this by approximating the surface by a polytope, which means discretizing the continuously infinite constraints into a very large finite number of constraints. I'm also in the situation where I'd like to know how the answer changes under small perturbations to the underlying problem. Thus, I'd like to be able to supply an initial condition to the solver based on a nearby solution. I believe this capability is called a "warm start." Can someone help me distinguish between the various LP packages out there? I'm not so concerned with user-friendliness as speed (for large numbers of constraints), high-precision arithmetic, and warm starts. Thanks!

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• How to Use Images as Navigation with innerfade Slideshow?

  - by Katie

  I am very new to JavaScript and only have the most basic understanding of how it works, so please bear with me. :) I'm using the jquery.innerfade.js script to create a slideshow with fade transitions for a website I'm developing, and I have added navigation buttons (which are set as background-images) that navigate between the “slides”. The navigation buttons have three states: default/off, hover, and on (each state is a separate image). I created a separate JavaScript document to set the buttons to “on” when they are clicked. The “hover” state is achieved through the CSS. Both the slideshow and the navigation buttons work well. There is just one thing I want to add: I would like the appropriate navigation button to display as “on” while the related “slide” is “playing”. Here's the HTML: <div id="mainFeature"> <ul id="theFeature"> <li id="the1feature"><a href="#" name="#promo1"><img src="_images/carousel/promo1.jpg" /></a></li> <li id="the2feature"><a href="#" name="#promo2"><img src="_images/carousel/promo2.jpg" /></a></li> <li id="the3feature"><a href="#" name="#promo3"><img src="_images/carousel/promo3.jpg" /></a></li> </ul> <div id="promonav-con"> <div id="primarypromonav"> <ul class="links"> <li id="the1title" class="promotop"><a rel="1" href="#promo1" class="promo1" id="promo1" onMouseDown="promo1on()"><strong>Botox Cosmetic</strong></a></li> <li id="the2title" class="promotop"><a rel="2" href="#promo2" class="promo2" id="promo2" onMouseDown="promo2on()"><strong>Promo 2</strong></a></li> <li id="the3title" class="promotop"><a rel="3" href="#promo3" class="promo3" id="promo3" onMouseDown="promo3on()"><strong>Promo 3</strong></a></li> </ul> </div> </div> And here is the jquery.innerfade.js, with my changes: (function($) { $.fn.innerfade = function(options) { return this.each(function() { $.innerfade(this, options); }); }; $.innerfade = function(container, options) { var settings = { 'speed': 'normal', 'timeout': 2000, 'containerheight': 'auto', 'runningclass': 'innerfade', 'children': null }; if (options) $.extend(settings, options); if (settings.children === null) var elements = $(container).children(); else var elements = $(container).children(settings.children); if (elements.length > 1) { $(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass); for (var i = 0; i < elements.length; i++) { $(elements[i]).css('z-index', String(elements.length-i)).css('position', 'absolute').hide(); }; this.ifchanger = setTimeout(function() { $.innerfade.next(elements, settings, 1, 0); }, settings.timeout); $(elements[0]).show(); } }; $.innerfade.next = function(elements, settings, current, last) { $(elements[last]).fadeOut(settings.speed); $(elements[current]).fadeIn(settings.speed, function() { removeFilter($(this)[0]); }); if ((current + 1) < elements.length) { current = current + 1; last = current - 1; } else { current = 0; last = elements.length - 1; } this.ifchanger = setTimeout((function() { $.innerfade.next(elements, settings, current, last); }), settings.timeout); }; })(jQuery); // **** remove Opacity-Filter in ie **** function removeFilter(element) { if(element.style.removeAttribute){ element.style.removeAttribute('filter'); } } jQuery(document).ready(function() { jQuery('ul#theFeature').innerfade({ speed: 1000, timeout: 7000, containerheight: '291px' }); // jQuery('#mainFeature .links').children('li').children('a').attr('href', 'javascript:void(0);'); jQuery('#mainFeature .links').children('li').children('a').click(function() { clearTimeout(jQuery.innerfade.ifchanger); for(i=1;i<5;i++) { jQuery('#the'+i+'feature').css("display", "none"); //jQuery('#the'+i+'title').children('a').css("background-color","#226478"); } // if(the_widths[(jQuery(this).attr('rel')-1)]==960) { // jQuery("#vic").hide(); // } else { // jQuery("#vic").show(); // } // jQuery('#the'+(jQuery(this).attr('rel'))+'title').css("background-color", "#286a7f"); jQuery('#the'+(jQuery(this).attr('rel'))+'feature').css("display", "block"); clearTimeout(jQuery.innerfade.ifchanger); }); }); And the separate JavaScript that I created: function promo1on() {document.getElementById("promo1").className="promo1on"; document.getElementById("promo2").className="promo2"; document.getElementById("promo2").className="promo2"; } function promo2on() {document.getElementById("promo2").className="promo2on"; document.getElementById("promo1").className="promo1"; document.getElementById("promo3").className="promo3"; } function promo3on() {document.getElementById("promo3").className="promo3on"; document.getElementById("promo1").className="promo1"; document.getElementById("promo2").className="promo2"; } And, finally, the CSS: #mainFeature {float: left; width: 672px; height: 290px; margin: 0 0 9px 0; list-style: none;} #mainFeature li {list-style: none;} #mainFeature #theFeature {margin: 0; padding: 0; position: relative;} #mainFeature #theFeature li {position: absolute; top: 0; left: 0;} #promonav-con {width: 463px; height: 26px; padding: 0; margin: 0; position: absolute; z-index: 900; top: 407px; left: 283px;} #primarypromonav {padding: 0; margin: 0;} #mainFeature .links {padding: 0; margin: 0; list-style: none; position: relative; font-family: arial, verdana, sans-serif; width: 463px; height: 26px;} #mainFeature .links li.promotop {list-style: none; display: block; float: left; display: inline; margin: 0; padding: 0;} #mainFeature .links li a {display: block; float: left; display: inline; height: 26px; text-decoration: none; margin: 0; padding: 0; cursor: pointer;} #mainFeature .links li a strong {margin-left: -9999px;} #mainFeature .links li a.promo1 {background: url(../_images/carouselnav/promo1.gif); width: 155px;} #mainFeature .links li:hover a.promo1 {background: url(../_images/carouselnav/promo1_hover.gif); width: 155px;} #mainFeature .links li a.promo1:hover {background: url(../_images/carouselnav/promo1_hover.gif); width: 155px;} .promo1on {background: url(../_images/carouselnav/promo1_on.gif); width: 155px;} #mainFeature .links li a.promo2 {background: url(../_images/carouselnav/promo2.gif); width: 153px;} #mainFeature .links li:hover a.promo2 {background: url(../_images/carouselnav/promo2_hover.gif); width: 153px;} #mainFeature .links li a.promo2:hover {background: url(../_images/carouselnav/promo2_hover.gif); width: 153px;} .promo2on {background: url(../_images/carouselnav/promo2_on.gif); width: 153px;} #mainFeature .links li a.promo3 {background: url(../_images/carouselnav/promo3.gif); width: 155px;} #mainFeature .links li:hover a.promo3 {background: url(../_images/carouselnav/promo3_hover.gif); width: 155px;} #mainFeature .links li a.promo3:hover {background: url(../_images/carouselnav/promo3_hover.gif); width: 155px;} .promo3on {background: url(../_images/carouselnav/promo3_on.gif); width: 155px;} Hopefully this makes sense! Again, I'm very new to JavaScript/JQuery, so I apologize if this is a mess. I'm very grateful for any suggestions. Thanks!

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• How to access a superclass's class attributes in Python?

  - by Brecht Machiels

  Have a look at the following code: class A(object): defaults = {'a': 1} def __getattr__(self, name): print('A.__getattr__') return self.get_default(name) @classmethod def get_default(cls, name): # some debug output print('A.get_default({}) - {}'.format(name, cls)) try: print(super(cls, cls).defaults) # as expected except AttributeError: #except for the base object class, of course pass # the actual function body try: return cls.defaults[name] except KeyError: return super(cls, cls).get_default(name) # infinite recursion #return cls.__mro__[1].get_default(name) # this works, though class B(A): defaults = {'b': 2} class C(B): defaults = {'c': 3} c = C() print('c.a =', c.a) I have a hierarchy of classes each with its own dictionary containing some default values. If an instance of a class doesn't have a particular attribute, a default value for it should be returned instead. If no default value for the attribute is contained in the current class's defaults dictionary, the superclass's defaults dictionary should be searched. I'm trying to implement this using the recursive class method get_default. The program gets stuck in an infinite recursion, unfortunately. My understanding of super() is obviously lacking. By accessing __mro__, I can get it to work properly though, but I'm not sure this is a proper solution. I have the feeling the answer is somewhere in this article, but I haven't been able to find it yet. Perhaps I need to resort to using a metaclass?

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• Ajax long polling (comet) + php on lighttpd v1.4.22 multiple instances problem.

  - by fibonacci

  Hi, I am new to this site, so I really hope I will provide all the necessary information regarding my question. I've been trying to create a "new message arrived notification" using long polling. Currently I am initiating the polling request by window.onLoad event of each page in my site. On the server side I have an infinite loop: while(1){ if(NewMessageArrived($current_user))break; sleep(10); } echo $newMessageCount; On the client side I have the following (simplified) ajax functions: poll_new_messages(){ xmlhttp=GetXmlHttpObject(); //... xmlhttp.onreadystatechange=got_new_message_count; //... xmlhttp.send(); } got_new_message_count(){ if (xmlhttp.readyState==4){ updateMessageCount(xmlhttp.responseText); //... poll_new_messages(); } } The problem is that with each page load, the above loop starts again. The result is multiple infinite loops for each user that eventually make my server hang. *The NewMessageArived() function queries MySQL DB for new unread messages. *At the beginning of the php script I run start_session() in order to obtain the $current_user value. I am currently the only user of this site so it is easy for me to debug this behavior by writing time() to a file inside this loop. What I see is that the file is being written more often than once in 10 seconds, but it starts only when I go from page to page. Please let me know if any additional information might help. Thank you.

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• Should my validator have access to my entire model?

  - by wb

  As the title states I'm wondering if it's a good idea for my validation class to have access to all properties from my model. Ideally, I would like to do that because some fields require 10+ other fields to verify whether it is valid or not. I could but would rather not have functions with 10+ parameters. Or would that make the model and validator too coupled with one another? Here is a little example of what I mean. This code however does not work because it give an infinite loop! Class User Private m_UserID Private m_Validator Public Sub Class_Initialize() End Sub Public Property Let Validator(value) Set m_Validator = value m_Validator.Initialize(Me) End Property Public Property Get Validator() Validator = m_Validator End Property Public Property Let UserID(value) m_UserID = value End property Public Property Get UserID() UserID = m_Validator.IsUserIDValid() End property End Class Class Validator Private m_User Public Sub Class_Initialize() End Sub Public Sub Initialize(value) Set m_User = value End Sub Public Function IsUserIDValid() IsUserIDValid = m_User.UserID > 13 End Function End Class Dim mike : Set mike = New User mike.UserID = 123456 mike.Validator = New Validator Response.Write mike.UserID If I'm right and it is a good idea, how can I go a head and fix the infinite loop with the get property UserID? Thank you.

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• Rotating an ImageVIew along with its original position in android in below HoneyComb versions

  - by candy

  I am trying rotate an ImageView along with its original location (rotating the image aswell as the view). So that After rotation, when I click on the rotated Image in its current position, it should be able clicked in the rotated location only. For this solution I am trying the following code. However it is rotating is going fine. After the rotation end I need to place the ImageView and Image in the rotated Location to make it able click over there only. But it is not going successfully. I am unable to rotated Image location axis points to place correctly. Can any one please suggest a way to resolve this issue. fyi-It should work on Gingerbread version android-9 aniView1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.e("", "Clicked on IMAGE VIEW - 1"); } }); RotateAnimation rotate5 = new RotateAnimation(0, 150, Animation.INFINITE, 100, Animation.INFINITE, 250); //rotate5.setFillAfter(true); rotate5.setDuration(2000); rotate5.setInterpolator(new LinearInterpolator()); aniView1.setAnimation(rotate5); rotate5.setAnimationListener(new Animation.AnimationListener() { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { int newTop = (int) (aniView1.getTop() + aniView1.getWidth()); aniView1.layout(aniView1.getLeft()-200, newTop, aniView1.getRight(), aniView1.getBottom() + aniView1.getMeasuredWidth()); // aniView1.setLayoutParams(new // RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,RelativeLayout.LayoutParams.WRAP_CONTENT)); } });

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• AIX specific socket programming query

  - by kumar_m_kiran

  Hi All, Question 1 From SUSE man pages, I get the below details for socket connect options If the initiating socket is connection-mode, then connect() shall attempt to establish a connection to the address specified by the address argument. If the connection cannot be established immediately and O_NONBLOCK is not set for the file descriptor for the socket, connect() shall block for up to an unspecified timeout interval until the connection is established. If the timeout interval expires before the connection is established, connect() shall fail and the connection attempt shall be aborted. If connect() is interrupted by a signal that is caught while blocked waiting to establish a connection, connect() shall fail and set errno to [EINTR], but the connection request shall not be aborted, and the connection shall be established asynchronously. Question : Is the above contents valid for AIX OS (especially the connection time-out, timed wait ...etc)?Because I do not see it in AIX man pages (5.1 and 5.3) Question 2 I have a client socket whose attributes are a. SO_RCVTIMEO ,SO_SNDTIMEO are set for 5 seconds. b. AF_INET and SOCK_STREAM. c. SO_LINGER with linger on and time is 5 seconds. d. SO_REUSEADDR is set. Note that the client socket is not O_NONBLOCK. Question : Now since O_NONBLOCK is not set and SO_RCVTIMEO and SO_SNDTIMEO is set for 5 seconds, does it mean a. connect in NON Blocking or Blocking? b. If blocking, is it timed blocking or "infinite" time blocking? c. If it is infinite, How do I establish a "connect" system call which is O_BLOCKING with timeout to t secs. Sorry if the questions are be very naive. Thanks in advance for your input.

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• Why is -webkit-keyframes not working in my SASS mixin?

  - by Tintin81

  I have this SASS mixin that should make a button flash: @mixin background_animation($color) { -webkit-animation: backgroundAnimation 800ms infinite; @-webkit-keyframes backgroundAnimation { 0% {background-color: $color;} 50% {background-color: red;} 100% {background-color: $color;} } } I am using it like this: @include background_animation(#000000); However, it's not working. The background color of the button won't flash. Can anybody tell me what I'm missing here? P.S. The code works fine when not including it as a mixin. The generated CSS looks like this: -webkit-animation-delay: 0s; -webkit-animation-direction: normal; -webkit-animation-duration: 0.800000011920929s; -webkit-animation-fill-mode: none; -webkit-animation-iteration-count: infinite; -webkit-animation-name: backgroundAnimation; -webkit-animation-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1); ... other rules omitted for brevity

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• throwing exception from APCProc crashes program

  - by lazy_banana

  I started to do some research on how terminate a multithreaded application properly and I found those 2 post(first, second) about how to use QueueUserAPC to signal other threads to terminate. I thought I should give it a try, and the application keeps crashing when I throw the exception from the APCProc. Code: #include <stdio.h> #include <windows.h> class ExitException { public: char *desc; DWORD exit_code; ExitException(char *desc,int exit_code): desc(desc), exit_code(exit_code) {} }; //I use this class to check if objects are deconstructed upon termination class Test { public: char *s; Test(char *s): s(s) { printf("%s ctor\n",s); } ~Test() { printf("%s dctor\n",s); } }; DWORD CALLBACK ThreadProc(void *useless) { try { Test t("thread_test"); SleepEx(INFINITE,true); return 0; } catch (ExitException &e) { printf("Thread exits\n%s %lu",e.desc,e.exit_code); return e.exit_code; } } void CALLBACK exit_apc_proc(ULONG_PTR param) { puts("In APCProc"); ExitException e("Application exit signal!",1); throw e; return; } int main() { HANDLE thread=CreateThread(NULL,0,ThreadProc,NULL,0,NULL); Sleep(1000); QueueUserAPC(exit_apc_proc,thread,0); WaitForSingleObject(thread,INFINITE); puts("main: bye"); return 0; } My question is why does this happen? I use mingw for compilation and my OS is 64bit. Can this be the reason?I read that you shouldn't call QueueApcProc from a 32bit app for a thread which runs in a 64bit process or vice versa, but this shouldn't be the case.

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• A data structure based on the R-Tree: creating new child nodes when a node is full, but what if I ha

  - by Tom

  I realize my title is not very clear, but I am having trouble thinking of a better one. If anyone wants to correct it, please do. I'm developing a data structure for my 2 dimensional game with an infinite universe. The data structure is based on a simple (!) node/leaf system, like the R-Tree. This is the basic concept: you set howmany childs you want a node (a container) to have maximum. If you want to add a leaf, but the node the leaf should be in is full, then it will create a new set of nodes within this node and move all current leafs to their new (more exact) node. This way, very populated areas will have a lot more subdivisions than a very big but rarely visited area. This works for normal objects. The only problem arises when I have more than maxChildsPerNode objects with the exact same X,Y location: because the node is full, it will create more exact subnodes, but the old leafs will all be put in the exact same node again because they have the exact same position -- resulting in an infinite loop of creating more nodes and more nodes. So, what should I do when I want to add more leafs than maxChildsPerNode with the exact same position to my tree? PS. if I failed to explain my problem, please tell me, so I can try to improve the explanation.

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• Is this function thread-safe?

  - by kiddo

  Hello all,I am learning multi-threading and for the sake of understanding I have wriiten a small function using multithreading...it works fine.But I just want to know if that thread is safe to use,did I followed the correct rule. void CThreadingEx4Dlg::OnBnClickedOk() { //in thread1 100 elements are copied to myShiftArray(which is a CStringArray) thread1 = AfxBeginThread((AFX_THREADPROC)MyThreadFunction1,this); WaitForSingleObject(thread1->m_hThread,INFINITE); //thread2 waits for thread1 to finish because thread2 is going to make use of myShiftArray(in which thread1 processes it first) thread2 = AfxBeginThread((AFX_THREADPROC)MyThreadFunction2,this); thread3 = AfxBeginThread((AFX_THREADPROC)MyThreadFunction3,this); } UINT MyThreadFunction1(LPARAM lparam) { CThreadingEx4Dlg* pthis = (CThreadingEx4Dlg*)lparam; pthis->MyFunction(0,100); return 0; } UINT MyThreadFunction2(LPARAM lparam) { CThreadingEx4Dlg* pthis = (CThreadingEx4Dlg*)lparam; pthis->MyCommonFunction(0,20); return 0; } UINT MyThreadFunction3(LPARAM lparam) { CThreadingEx4Dlg* pthis = (CThreadingEx4Dlg*)lparam; WaitForSingleObject(pthis->thread3->m_hThread,INFINITE); //here thread3 waits for thread 2 to finish so that thread can continue pthis->MyCommonFunction(21,40); return 0; } void CThreadingEx4Dlg::MyFunction(int minCount,int maxCount) { for(int i=minCount;i<maxCount;i++) { //assume myArray is a CStringArray and it has 100 elemnts added to it. //myShiftArray is a CStringArray -public to the class CString temp; temp = myArray.GetAt(i); myShiftArray.Add(temp); } } void CThreadingEx4Dlg::MyCommonFunction(int min,int max) { for(int i = min;i < max;i++) { CSingleLock myLock(&myCS,TRUE); CString temp; temp = myShiftArray.GetAt(i); //threadArray is CStringArray-public to the class threadArray.Add(temp); } myEvent.PulseEvent(); }

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• Oracle clients dead wait

  - by Macroideal

  hi all friends I meet a problem yesterday. Maybe it's because it is April 1st... but it did exist. I have 3 PCs in remote area, two clients and one oracle server. My app is running separately in the two clients, connecting hourly to the oracle database. My clients worked well before April 1st, but suddenly my app in the client machines went down. Firstly, I did not change any configurations. I used libsqlora8 to connect to the server. I went into a dead loop in the library. I tried sqlplus, but it is dead there in my shell terminal, like it meets an infinite loop: no return until i pressed ctrl + c. The reason I guess is an "infinite loop" somewhere. BTW, when I used my local PC to connect the server, it worked well. Just from this phenomenon, we can see the problem lies in the client machine. I checked the configuration file both in local machine and client machines -they are identical Have you met a problem like this? I hope it's not due to April 1st.

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• Redirecting http to https for a directory, via .htaccess, using mod_alias only

  - by Belinda

  I have the common problem of wanting to redirect requests for a certain restricted access directory from http to https, so that users' login credentials are sent in a secure way. However, I do not have mod_rewrite enabled on my server. I only have mod_alias. This means I have to use the RedirectMatch command. I can't use the usual solutions that use RewriteCond and RewriteRule. (A note on the politics: I am a small-fry subsite maintainer in a very large organisation, so the server admins are unlikely to be willing to change the server config for me!) The following line works, but forms an infinite loop (because the rewritten URL is still caught by the initial regular expression): RedirectMatch permanent ^/intranet(.*)$ https://example.com/intranet$1 One of my internal IT guys has suggested I avoid the infinite loop by moving the files to a new directory with a new name (eg /intranet2/). That seems pretty ugly to me. And people could still accidentally/deliberately revert to an insecure connection by visiting http://example.com/intranet2/ directly. Then I tried this, but it didn't work: RedirectMatch permanent ^http:(.*)/intranet(.*)$ https://example.com/intranet$1 I suspect it didn't work because the first argument must be a file path from the root directory, so it can't start with "http:". So: any better ideas how to do this?

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• Windows setevent processsing

  - by Waldorf

  I wonder how setevent is handled internally within Windows. I have the following situation Std::thread thread loop which executes while std::atomic == true Inside the loop is a waitforsingleObject which sleeps infinite in alertable state. A function stopThread() which does the following: - Clears the atomic bool - Calls Setevent on the event object - Calls thread.join This often hangs, I get the impression that setevent has still some work to do in the current thread, while join blocks the current thread. If I add an additional Boolean in the thread which is set after waitforsinlgleObject and I wait for this to be set before calling join() Everything seems to work ok. Code (error checking omitted here) Init code/declarations: HANDLE m_WakeupThreadEvent; std::atomic<bool> m_ReceiverEnabled; m_WakeupThreadEvent = CreateEvent(NULL, false, false, "RxThreadWakeupEvent" ); Thread code: while(m_ReceiverEnabled) { DWORD rslt = WaitForSingleObjectEx(m_WakeupThreadEvent, INFINITE, true); // Here some checking for rslt; } function code: m_ReceiverEnabled = true; SetEvent( m_WakeupThreadEvent ) m_Thread.join() Is there some explanation for this behavior ? I could not find any details about the operation of setEvent()

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• IIS 301 Redirect from "/index.html" to "/" for SEO Canonicalization

  - by brainbolt

  I used the technique explained here for IIS (http://www.webconfs.com/how-to-redirect-a-webpage.php), but this appears to result in an infinite loop when applied to "/index.htm" and redirected to "/". Is there another way to do this in IIS so that it doesn't loop infinitely? This page is static HTML, so I can't implement an ASP or ASP.net solution. Any ideas?

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• Windows repair console, impossible?

  - by Daniel

  I found an old Windows XP SP2 in my -trash- cd can and tried it on a 30 GB FAT32 partition. Installation went fine till the copying operation was completed and XP asked for reboot. After that either it starts over again or throws invalid disk. Starting over is an infinite loop the only way I see is to choose the "Repair console" but I'm not used to a DOS box. Can anyone help me through this harmful installation?

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