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• "pseudo-atomic" operations in C++

  - by dan

  So I'm aware that nothing is atomic in C++. But I'm trying to figure out if there are any "pseudo-atomic" assumptions I can make. The reason is that I want to avoid using mutexes in some simple situations where I only need very weak guarantees. 1) Suppose I have globally defined volatile bool b, which initially I set true. Then I launch a thread which executes a loop while(b) doSomething(); Meanwhile, in another thread, I execute b=true. Can I assume that the first thread will continue to execute? In other words, if b starts out as true, and the first thread checks the value of b at the same time as the second thread assigns b=true, can I assume that the first thread will read the value of b as true? Or is it possible that at some intermediate point of the assignment b=true, the value of b might be read as false? 2) Now suppose that b is initially false. Then the first thread executes bool b1=b; bool b2=b; if(b1 && !b2) bad(); while the second thread executes b=true. Can I assume that bad() never gets called? 3) What about an int or other builtin types: suppose I have volatile int i, which is initially (say) 7, and then I assign i=7. Can I assume that, at any time during this operation, from any thread, the value of i will be equal to 7? 4) I have volatile int i=7, and then I execute i++ from some thread, and all other threads only read the value of i. Can I assume that i never has any value, in any thread, except for either 7 or 8? 5) I have volatile int i, from one thread I execute i=7, and from another I execute i=8. Afterwards, is i guaranteed to be either 7 or 8 (or whatever two values I have chosen to assign)?

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• Dispose, when is it called?

  - by Snake

  Consider the following code: namespace DisposeTest { using System; class Program { static void Main(string[] args) { Console.WriteLine("Calling Test"); Test(); Console.WriteLine("Call to Test done"); } static void Test() { DisposeImplementation di = new DisposeImplementation(); } } internal class DisposeImplementation : IDisposable { ~DisposeImplementation() { Console.WriteLine("~ in DisposeImplementation instance called"); } public void Dispose() { Console.WriteLine("Dispose in DisposeImplementation instance called"); } } } The Dispose just never get's called, even if I put a wait loop after the Test(); invocation. So that quite sucks. I want to write a class that is straightforward and very easy to use, to make sure that every possible resource is cleaned up. I don't want to put that responsibilty to the user of my class. Possible solution: use using, or call Dispose myself(basicly the same). Can I force the user to use a using? Or can I force the dispose to be called? Calling GC.Collect(); after Test(); doesn't work either. Putting di to null doesn't invoke Dispose either. The Deconstructor DOES work, so the object get's deconstructed when it exits Test()

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• C++ Template Iterator error

  - by gprime

  I am going over some code i wrote in 2006 as an undergrad. It's a simple genetic algorithm library written in C++ using templates. It use to work in 2006 when i coded it with visual studio, but now when i am trying to run it in xcode i get compile errors. This function is giving me errors: friend bool operator==(const TSPGenome<T> & t1, const TSPGenome<T> & t2) { // loop through each interator and check to see if the two genomes have the same values if(t1.genome_vec->size() != t2.genome_vec->size()) return false; else { // iterate through each vector<T>::iterator it_t1; vector<T>::iterator it_t2; it_t1 = t1.genome_vec->begin(); for(it_t2 = t2.genome_vec->begin(); it_t2 != t2.genome_vec->end(); ++it_t2, ++it_t1) { if(*it_t2 != *it_t1) return false; } } // everything seems good return true; } xcode complains about these two lines not having ; before it_t1 and it_t2. vector<T>::iterator it_t1; vector<T>::iterator it_t2; Is it because the vector type it T? I declared it in the class as follows: template <typename T> class TSPGenome : public Genome { Any help would be appreciated. Thanks!

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• [java] tcp socket communication [send and recieve help]

  - by raven

  hello, I am creating a Chat in java. I have a method (onMouseRelease) inside an object that creates a tcp server and waits for a socket ServerSocket server = new ServerSocket(port); Socket channel = server.accept(); now I want to make a thread that will loop and read data from the socket, so that once the user on the other side sent me a string, I will extract the data from the socket [or is it called packet? sry I am new to this], and update a textbox to add the additional string from the socket [or packet?]. I have no idea how to READ (extract) the information from the scoket [/packet] and then update it into a JTextArea which is called userOutput. And how to Send a string to the other client, so that it will also could read the new data and update its JTextArea. (from what I know, for a 2 sided tcp communication you need one computer to host a server and the other to connect [as a client] and once the connection is set the client can also recieve new information from the socket. Is that true? and please tell me how ) Any help appreciated !! I know this is abit long but I have searched allot and didn't understand [I saw something like printwriter but failed to understand].

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• TCP socket communication

  - by raven

  hello, I am creating a Chat in java. I have a method (onMouseRelease) inside an object that creates a tcp server and waits for a socket like this: ServerSocket server = new ServerSocket(port); Socket channel = server.accept(); Now I want to make a thread that will loop and read data from the socket, so that once the user on the other side sends me a string, I will extract the data from the socket (or is it called packet? Sorry, I am new to this) and update a textbox to add the additional string from the socket (or packet?). I have no idea how to READ (extract) the information from the socket(/packet) and then update it into a JTextArea which is called userOutput. And how to send a string to the other client, so that it will also could read the new data and update its JTextArea. From what I know, for a 2 sided TCP communication you need one computer to host a server and the other to connect (as a client) and once the connection is set the client can also receive new information from the socket. Is that true? and please tell me how. Any help is appreciated! I know this is a bit long but I have searched a lot and didn't understand it (I saw something like PrintWriter but failed to understand).

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• jQuery .val() Selector Confusion

  - by Matt Dawdy

  I've kind of written myself into a corner, and was hoping there was an "easy" way out. I'm trying to loop through a series of things on my page, and build a key:value pair. Here is my structure: <div class="divMapTab" id="divMapTab34"> <div class="divFieldMap"> <select class="selSrc" id="selTargetnamex"><options....></select> </div> </div> <div class="divMapTab" id="divMapTab87"> <div class="divFieldMap"> <select class="selSrc" id="selTargetnamex"><options....></select> </div> </div> It's way more complicated than that, and there are many select elements inside of each divFieldMap div. Here is my JS function that is building my string: function Save() { var sSaveString = ''; $('.divMapTab').each(function() { var thisId = this.id; $('.selSrc', "#" + thisId).each(function() { var thisSubId = this.id; //alert(thisSubId); <-- HERE IS THE PROBLEM var sTargetCol = thisSubId.replace('selTarget', ''); var sValue = this.val(); sSaveString += sTargetCol + '¸' + sValue + '·'; }); }); } On the line that has the alert box and the text "HERE IS THE PROBLEM" is that I'm trying to get the selected value of the "current" select input element, but the id of that element isn't unique (I thought it would be, but I screwed up). Is there a good way, inside of an "each" type of jQuery statement, to use "this" to get the exact select element that I really am looking for, even if it doesn't have a unique id?

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• More efficient way to update multiple elements in javascript and/or jquery?

  - by Seiverence

  Say I have 6 divs with ID "#first", ""#second" ... "#sixth". Say if I wanted to execute functions on each of those divs, I would set up an array that contains each of the names of the divs I want to update as an element in the array of strings. ["first", "second", "third"] that I want to update. If I wanted to apply I function, I set up a for loop that iterates through each element in the array and say if I wanted to change the background color to red: function updateAllDivsInTheList() { for(var i = 0; i < array.size; i++) $("#"+array[i]).changeCssFunction(); } } Whenever I create a new div, i would add it to the array. The issue is, if I have a large number of divs that need to get updated, say if I wanted to update 1000 out of 1200 divs, it may be a pain/performance tank to have to sequentially iterate through every single element in the array. Is there some alternative more efficient way of updating multiple divs without having to sequentially iterate through every element in an array, maybe with some other more efficient data structure besides array? Or is what I am doing the most efficient way to do it? If can provide some example, that would be great.

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• Visual C++ function suddenly 170x slower

  - by Mikael

  For the past few months I've been working on a Visual C++ project to take images from cameras and process them. Up until today this has taken about 65 ms to update the data but now it has suddenly increased significantly. What happens is: I launch my program and for the first 30 or so iterations it performs as expected, then suddenly the loop time increases from 65 ms to 250 ms. The odd thing is, after timing each function I found out that the part of the code which is causing the slowdown is fairly basic and has not been modified in over a month. The data which goes into it is unchanged and identical every iteration but the execution time which is initially less than 1 ms suddenly increases to 170 ms while the rest of the code is still performing as expected (time-wise). Basically, I am calling the same function over and over, for the first 30 calls it performs as it should, after that it slows down for no apparent reason. It might also be worth noting that it is a sudden change in execution time, not a gradual increase. What could be causing this? The code is leaking some memory (~50 kb/s) but not nearly enough to warrant a sudden 4x slowdown. If anyone has any ideas I'd love to hear them!

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• Identifying memory leaks in C++

  - by Dororo

  I've got the following bit of code, which I've narrowed down to be causing a memory leak (that is, in Task Manager, the Private Working Set of memory increases with the same repeated input string). I understand the concepts of heaps and stacks for memory, as well as the general rules for avoiding memory leaks, but something somewhere is still going wrong: while(!quit){ char* thebuffer = new char[210]; //checked the function, it isn't creating the leak int size = FuncToObtainInputTextFromApp(thebuffer); //stored in thebuffer string bufferstring = thebuffer; int startlog = bufferstring.find("$"); int endlog = bufferstring.find("&"); string str_text=""; str_text = bufferstring.substr(startlog,endlog-startlog+1); String^ str_text_m = gcnew String(str_text_m.c_str()); //some work done delete str_text_m; delete [] thebuffer; } The only thing I can think of is it might be the creation of 'string str_text' since it never goes out of scope since it just reloops in the while? If so, how would I resolve that? Defining it outside the while loop wouldn't solve it since it'd also remain in scope then too. Any help would be greatly appreciated.

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• navigation li to create <span></span> around text via jquery

  - by MikesEpitaphSays

  I've been trying all day and reading a few things, but for some reason my code isn't working right What i'm trying to achieve is this: When i create an un ordered list in my index page - I want my jquery to automatically add around the text in the anchor. So i want it to look like this <li><a href="index.htm"><span>Home</span></a></li> while I am only adding: <li><a href="index.htm">Home</a></li> I want to do this because i have a LOT of list items and instead of writing when i'm adding pages it makes the most sense to save some time in the long run and create a loop that will handle that anytime i add one. This is What i have so far (sorry if it looks ugly): $('document').ready(function () { var begSpan = "<span>"; var endSpan = "</span>"; $('p').each(function () { $(this) prepend(begSpan); }).append(endSpan); }); How can i get that to auto create span tags for me

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• Parse particular text from an XML string

  - by Dan Sewell

  Hi all, Im writing an app which reads an RSS feed and places items on a map. I need to read the lat and long numbers only from this string: http://www.xxxxxxxxxxxxxx.co.uk/map.aspx?isTrafficAlert=true&lat=53.647351&lon=-1.933506 .This is contained in link tags Im a bit of a programming noob but im writing this in C#/Silverlight using Linq to XML. Shold this text be extrated when parsing or after parsing and sent to a class to do this? Many thanks for your assistance. EDIT. Im going to try and do a regex on this this is where I need to integrate the regex somewhere in this code. I need to take the lat and long from the Link element and seperate it into two variables I can use (the results are part of a foreach loop that creates a list.) var events = from ev in document.Descendants("item") select new { Title = (ev.Element("title").Value), Description = (ev.Element("description").Value), Link = (ev.Element("link").Value), }; Question is im not quite ure where to put the regex (once I work out how to use the regex properly! :-) )

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• PHP & MySQL query value question.

  - by space

  How can I use the first query's id value $row['id'] again after I run a second query inside the while loop statement? To show you what I mean here is a sample code below of what I'm trying to do. I hope I explained it right. Here is the code. $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc = mysqli_query($mysqli,"SELECT users.* FROM users WHERE user_id = 4"); if (!$dbc) { // There was an error...do something about it here... print mysqli_error($mysqli); } while($row = mysqli_fetch_assoc($dbc)) { echo '<div>User: ' . $row['id'] . '</div>'; echo '<div>Link To User' . $row['id'] . '</div>'; $mysqli = mysqli_connect("localhost", "root", "", "sitename"); $dbc2 = mysqli_query($mysqli,"SELECT COUNT(cid) as num FROM comments WHERE comments_id = $row[id]"); if (!$dbc2) { // There was an error...do something about it here... print mysqli_error($mysqli); } else { while($row = mysqli_fetch_array($dbc2)){ $num = $row['num']; } } echo '<div>User ' . $row['id'] . ' Comments# ' . $num . '</div>'; }

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• Java socket bug on linux (0xFF sent, -3 received)

  - by Marius

  While working on a WebSocket server in Java I came across this strange bug. I've reduced it down to two small java files, one is the server, the other is the client. The client simply sends 0x00, the string Hello and then 0xFF (per the WebSocket specification). On my windows machine, the server prints the following: Listening byte: 0 72 101 108 108 111 recieved: 'Hello' While on my unix box the same code prints the following: Listening byte: 0 72 101 108 108 111 -3 Instead of receiving 0xFF it gets -3, never breaks out of the loop and never prints what it has received. The important part of the code looks like this: byte b = (byte)in.read(); System.out.println("byte: "+b); StringBuilder input = new StringBuilder(); b = (byte)in.read(); while((b & 0xFF) != 0xFF){ input.append((char)b); System.out.print(b+" "); b = (byte)in.read(); } inputLine = input.toString(); System.out.println("recieved: '" + inputLine+"'"); if(inputLine.equals("bye")){ break; } I've also uploaded the two files to my server: Server.java Client.java My Windows machine is running windows 7 and my Linux machine is running Debian

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• ASP error 424 Object required

  - by jeff

  I've got a problem with the following code pasted below, the problem seems to be coming from the openastextstream this carries on from another question: Set str_text_stream = obj_file.OpenAsTextStream(ForReading, TristateUseDefault) response.Write "<table>" int_j = 0 int_x = 0 Err.number = 0 Do While Not str_text_stream.AtEndOfStream str_po_insert_sql = "INSERT into tbl_purchase_orders (purchase_order_number, purchase_order_vendor_number, purchase_order_vendor_name) " str_po_insert_sql = str_po_insert_sql & " VALUES (" str_line = str_text_stream.readline arr_line = Split(str_line, """,""", -1) if Ubound(arr_line) <> 2 then Response.write "<tr><td>The line " & str_line & " could not be imported.</td></tr>" int_x = 1 else int_y = Instr(arr_line(2), """,") - 1 str_field_0 = Replace(arr_line(0), """", "") str_field_0 = Replace(str_field_0, "'", "''") str_field_1 = Replace(arr_line(1), "'", "''") str_field_2 = Left(arr_line(2), int_y) str_field_2 = Replace(str_field_2, "'", "''") str_po_insert_sql = str_po_insert_sql & "'" & str_field_0 & "', '" & arr_line(1) & "', '" & str_field_2 & "')" rs_po_insert.Open str_po_insert_sql, dbConnection, 3 if Err.number <> 0 then Response.write "<tr><td>The line " & str_po_insert_sql & " was imported.</td></tr>" end if Err.number = 0 int_j = int_j + 1 end if loop data from test import: "4501366934","800002","Clancy Docwra Ltd",04/05/2010 00:00:00 "4501366935","800004","Clancy Docwra Ltd",04/05/2010 00:00:00 "4501366936","800004","Clancy Docwra Ltd",04/05/2010 00:00:00

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• Which way of declaring a variable is fastest?

  - by ADB

  For a variable used in a function that is called very often and for implementation in J2ME on a blackberry (if that changed something, can you explain)? class X { int i; public void someFunc(int j) { i = 0; while( i < j ){ [...] i++; } } } or class X { static int i; public void someFunc(int j) { i = 0; while( i < j ){ [...] i++; } } } or class X { public void someFunc(int j) { int i = 0; while( i < j ){ [...] i++; } } } I know there is a difference how a static versus non-static class variable is accessed, but I don't know it would affect the speed. I also remember reading somewhere that in-function variables may be accessed faster, but I don't know why and where I read that. Background on the question: some painting function in games are called excessively often and even small difference in access time can affect the overall performance when a variable is used in a largish loop.

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• EF Query with conditional include that uses Joins

  - by makerofthings7

  This is a follow up to another user's question. I have 5 tables CompanyDetail CompanyContacts FK to CompanyDetail CompanyContactsSecurity FK to CompanyContact UserDetail UserGroupMembership FK to UserDetail How do I return all companies and include the contacts in the same query? I would like to include companies that contain zero contacts. Companies have a 1 to many association to Contacts, however not every user is permitted to see every Contact. My goal is to get a list of every Company regardless of the count of Contacts, but include contact data. Right now I have this working query: var userGroupsQueryable = _entities.UserGroupMembership .Where(ug => ug.UserID == UserID) .Select(a => a.GroupMembership); var contactsGroupsQueryable = _entities.CompanyContactsSecurity;//.Where(c => c.CompanyID == companyID); /// OLD Query that shows permitted contacts /// ... I want to "use this query inside "listOfCompany" /// //var permittedContacts= from c in userGroupsQueryable //join p in contactsGroupsQueryable on c equals p.GroupID //select p; However this is inefficient when I need to get all contacts for all companies, since I use a For..Each loop and query each company individually and update my viewmodel. Question: How do I shoehorn the permittedContacts variable above and insert that into this query: var listOfCompany = from company in _entities.CompanyDetail.Include("CompanyContacts").Include("CompanyContactsSecurity") where company.CompanyContacts.Any( // Insert Query here.... // b => b.CompanyContactsSecurity.Join(/*inner*/,/*OuterKey*/,/*innerKey*/,/*ResultSelector*/) ) select company; My attempt at doing this resulted in: var listOfCompany = from company in _entities.CompanyDetail.Include("CompanyContacts").Include("CompanyContactsSecurity") where company.CompanyContacts.Any( // This is concept only... doesn't work... from grps in userGroupsQueryable join p in company.CompanyContactsSecurity on grps equals p.GroupID select p ) select company;

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• Returning a lua table on SWIG call

  - by Tom J Nowell

  I have a class with a methodcalled GetEnemiesLua. I have bound this class to lua using SWIG, and I can call this method using my lua code. I am trying to get the method to return a lua table of objects. Here is my current code: void CSpringGame::GetEnemiesLua(){ std::vector<springai::Unit*> enemies = callback->GetEnemyUnits(); if( enemies.empty()){ lua_pushnil(ai->L); return; } else{ lua_newtable(ai->L); int top = lua_gettop(ai->L); int index = 1; for (std::vector<springai::Unit*>::iterator it = enemies.begin(); it != enemies.end(); ++it) { //key lua_pushinteger(ai->L,index);//lua_pushstring(L, key); //value CSpringUnit* unit = new CSpringUnit(callback,*it,this); ai->PushIUnit(unit); lua_settable(ai->L, -3); ++index; } ::lua_pushvalue(ai->L,-1); } } PushIUnit is as follows: void CTestAI::PushIUnit(IUnit* unit){ SWIG_NewPointerObj(L,unit,SWIGTYPE_p_IUnit,1); } To test this I have the following code: t = game:GetEnemiesLua() if t == nil then game:SendToConsole("t is nil! ") end The result is always 't is nil', despite this being incorrect. I have put breakpoints in the code and it is indeed going over the loop, rather than doing lua_pushnil. So how do I make my method return a table when called via lua?

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• jquery autocomplete extra spaces

  - by elasticrash

  I got this loop in a jsp file <% for (int i = 0; i < length; i++) { for( int j = 0; j < width; j++) { element = MAP_LIST[j][i]; if (element.equals("A")) {} else if (j == width-1 && i == length-1){ %> <%=element%><%} else { %> <%=element%>,<%} } } %> which gets me a csv list from an oracle database for my autocomplete text field by using jquery function Mapsheets(type,nomos) { $(function() { var f_data; $.get('/gaec_web/MapSheets.jsp',{'datasrc-select':datasource, 'type_1': type, 'nomos': nomos}, function(data){ f_data = data.split(','); $( "#fx_no" ).autocomplete({ source: f_data, minLength: 2 }); }); }); } everything works like a charm, i type the first 2 chars and the autocomplete pops up displays every thing as it was supposed to and when I try to pick a value i get the value with several (5) extra spaces in the tail. And then when it gets submitted it fails cause it doesnt match the mapname in question. the results look like this " 320-197" So what is causing this? if i run the jsp page alone also get normal results for example 372-146, 376-146, 372-149, 368-149, 376-149, 380-149, 380-152, 376-152, 372-152, 368-152, 368-155, 376-155, 372-155, 380-155, 368-158, 380-158, 376-158, 372-158 thanks in advance

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• Search for values in nested array

  - by dardub

  I have an array as follows array(2) { ["operator"] => array(2) { ["qty"] => int(2) ["id"] => int(251) } ["accessory209"] => array(2) { ["qty"] => int(1) ["id"] => int(209) } ["accessory211"] => array(2) { ["qty"] => int(1) ["id"] => int(211) } } I'm trying to find a way to verify an id value exists within the array and return bool. I'm trying to figure out a quick way that doesn't require creating a loop. Using the in_array function did not work, and I also read that it is quite slow. In the php manual someone recommended using flip_array() and then isset(), but I can't get it to work for a 2-d array. doing something like if($array['accessory']['id'] == 211) would also work for me, but I need to match all keys containing accessory -- not sure how to do that Anyways, I'm spinning in circles, and could use some help. This seems like it should be easy. Thanks.

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• OpenGL multiple threads, variable handling [closed]

  - by toeplitz

  I have written an OpenGL program which runs in the following way: Main: - Initialize SDL - Create thread which has the OpenGL context: - Renderloop - Set camera (view) matrix with glUniform. - glDrawElements() .... etc. - Swapbuffers(); - Main SDL loop handling input events and such. - Update camera matrix of type glm::mat4. This is how I pass my camera object to the class that handles opengl. Camera *cam = new Camera(); gl.setCam(cam); where void setCam(Camera *camera) { this->camera = camera; } For rendering in the opengl context thread, this happens: glm::mat4 modelView = camera->view * model; glUniformMatrix4fv(shader->bindUniform("modelView"), 1, GL_FALSE, glm::value_ptr(modelView)); In the main program where my SDL and other things are handles I then recompute the view matrix. This his working fine without me using any mutex locks. Is this correct? On the other hand, I add objects to my scene by an "upload queue" and in this case I have to mutex lock my upload queue vector (vector class type) when adding items to it or else the program crashes. In summary: I recompute my matrix in a different thread and then use it in the opengl thread without any mutex lock. Why is this working? Edit: I think my question is similar to what was asked here: Should I lock a variable in one thread if I only need it's value in other threads, and why does it work if I don't?, only in my case it is even more simple with only one matrix being changed.

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• C++ Instantiate class and add name to array/vector then cycle through update functions from the array

  - by SD42

  I have a bunch of classes in a basic (and badly coded!) game engine that are currently instantiated in the code and have to have their individual update functions called. What I want to do is be able to create an instance of a class, pass the name to an array, and then subsequently cycle through the array to call the update functions of each class. I'm unsure as to whether or not this is an impossible or spectacularly stupid way of trying to manage objects, so please tell me if it is. So currently I might have manually instantiated Enemy class a couple of times: Enemy enem1; Enemy enem2; I then have to update them manually in the game loop: enem1.update(); enem2.update(); What method should I use to be able to spawn and destroy instances of the enemy class during gametime? Is it possible to populate an array with instantiated names and then do something like (and i'm aware this doesn't work); array[x].update(); Then iterate through the names in the array? Anything that even points me in the right direction would be greatly appreciated!

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• recvfrom() return values in Stop-and-Wait UDP?

  - by mavErick

  I am trying to implement a Stop-and-Wait UDP client-server socket program in C. As known, there are basically three possible scenarios for Stop-and-Wait flow control. i.e., After transmitting a packet, the sender receives a correct ACK and thus starts transmitting the next packet; the sender receives an incorrect ACK and thus retransmits this packet; the sender receives no ACK within a TIMEOUT and thus retransmits this packet. My idea is to differentiate these three scenarios with the return value of recvfrom() on the sender side. For scenario 1&2: recvfrom() just returns the length of the received ACK. Since in my implementation the incorrect ACK is of the same length of the correct one, so I will have to go deeper and check the contents of the ACK. It's not a big deal. I know how to do. Problems come when I am trying to recognize scenario 3 where no ACK is received. What confuses me is that my recvfrom() is within a while loop, so the recvfrom() will be called constantly. What will it return when the receiver is not actually sending the sender ACK? Is it 0 or 1?

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• multiple dependent android projects in eclipse

  - by lope

  Hi there! I just started to play with android dev and java+eclipse is pretty new to me. I managed to create simple project and run it on my device. Now I want to create simple game (more of them actually) and I would love to use shared code base for all of them (game loop, initialization, etc..). Problem is that I have no idea how to correctly do this. I created android project called engine with all basic stuff that I need and made it work on device. Now I tried to create another project in same workspace called mygame. Main class (activity) of mygame is MyGameApp which inherits from EngineApp (main activity of my engine project) which inherits from Activity. I added engine project into required projects in mygame build path tab in properties. Problem is that when I try to run this project it crashes on ClassNotFoundException trying to find my MyGameApp class. Any help (or pointer to some articles that explain how this is done) is greatly appreciated. few hours of googling didn't help much :/

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• How to calculate how many business days are between two dates?

  - by mystify

  A friend asked me yesterday if this was possible on the iPhone. I took a look at NSCalendar and all the related Classes but couldn't find a solution to this. So I thought about this approach: If I had two dates dateA and dateB, I would have to make a for-loop and iterate over every single day in this interval. Then I would count the business days monday until friday, and return the result. Then I went to bed, and I woke up with this probably much better idea: I need to know what day is it when I start. Lets say it's thursday. And then I must know how many days are in that interval. The last part is not hard to figure out. For the first part, I have no clue yet, but I believe there's an day of week value in NSCalendar. With that, I could do some simple math to calculate the amount of business days. Did anyone do that already on the iPhone?

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• Camera crashes in android 4.1(API level 16)

  - by Lincy

  My application has a camera functionality. It works fine in all Android version but now when i tested in S3 it crashes. The error points to this line: Parameters parameters = mCamera.getParameters(); Could someone provide a solution for this? The log is below: ?:??: W/?(?): java.lang.NullPointerException ?:??: W/?(?): at com.stpl.snapshun.camera.CameraActivity.surfaceChanged(CameraActivity.java:313) ?:??: W/?(?): at android.view.SurfaceView.updateWindow(SurfaceView.java:554) ?:??: W/?(?): at android.view.SurfaceView.access$000(SurfaceView.java:81) ?:??: W/?(?): at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169) ?:??: W/?(?): at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:671) ?:??: W/?(?): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1818) ?:??: W/?(?): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) ?:??: W/?(?): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212) ?:??: W/?(?): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725) ?:??: W/?(?): at android.view.Choreographer.doCallbacks(Choreographer.java:555) ?:??: W/?(?): at android.view.Choreographer.doFrame(Choreographer.java:525) ?:??: W/?(?): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711) ?:??: W/?(?): at android.os.Handler.handleCallback(Handler.java:615) ?:??: W/?(?): at android.os.Handler.dispatchMessage(Handler.java:92) ?:??: W/?(?): at android.os.Looper.loop(Looper.java:137) ?:??: W/?(?): at android.app.ActivityThread.main(ActivityThread.java:4745) ?:??: W/?(?): at java.lang.reflect.Method.invokeNative(Native Method) ?:??: W/?(?): at java.lang.reflect.Method.invoke(Method.java:511) ?:??: W/?(?): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) ?:??: W/?(?): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) ?:??: W/?(?): at dalvik.system.NativeStart.main(Native Method) Thanks in advance

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