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  • willRotateToInterfaceOrientation:duration: not called for iOS5 after dismissing from modal

    - by Jean-Denis Muys
    My main UIViewController overrides willRotateToInterfaceOrientation:duration: to adapt the background view for the correct orientation. This works fine when staying within the view. But in my app, the result of some user actions can lead to presenting another "daughter" UIViewController. When the user is done with that daughter UIViewController, she normally returns to the main view controller. My code calls dismissModalViewControllerAnimated: to do so. The issue occurs when the user changes the iPad orientation while the daughter UIViewController is on screen. Then, the main UIViewController will never see any call to willRotateToInterfaceOrientation:duration: and its background view will be incorrect. This setup works fine in iOS 4: the iOS 4 implementation of dismissModalViewControllerAnimated: calls UIWindow's _setRotatableClient:toOrientation:updateStatusBar:duration:force: which calls willRotateToInterfaceOrientation:duration: for the switched in UIViewController. Apparently , this behavior changed for iOS 5. How am I expected to implemented orientation changes while my view is off screen under iOS5? Am I supposed to query the current orientation in viewWillAppear: for example?

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  • svn diff: file marked as binary type

    - by Charles Ma
    I'm doing an svn diff on one of my files and svn is detecting it as a binary type. The file is readable plain text and I would like to be able to get a diff of this file. How do I tell SVN that this is not a binary file? Cannot display: file marked as a binary type. svn:mime-type = application/octet-stream

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  • dUnit Testing in Delphi (how to test private methods)

    - by Charles Faiga
    I have a class that I am unit testing into with dUnit It has a number of methods some public Methods & Private Methods type TAuth = class(TDataModule) private procedure PrivateMethod; public procedure PublicMethod; end; In order to write a unit test for this class I have to make all the methods public. Is there a differt way to declare the PrivateMethods so that I can still unit test them but they are not Public ?

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  • oracle's pro*C compiler and gnu C (__builtin_va_list, __attribute__, etc)

    - by Charles Ma
    I'm compiling a database library with pro*C which converts the .ppc library file to a .c file that gcc can use. However, I'm getting a lot of errors in pro*C like the following PCC-S-02201, Encountered the symbol "__ attribute__ " when expecting one of the following ... , Encountered the symbol "__builtin_va_list" when expecting one of the following The missing symbols are from a chain of standard includes like stdio.h and stdlib.h. How do I get around this issue? The library I'm compiling came from an old solaris system that we're now upgrading (to a new solaris 10 system) and the header files don't seem to use these symbols. e.g. the newer .h files has typedef __builtin_va_list va_list while the old .h files has typedef void* va_list There are a lot of things like this so I'm reluctant to go and fix all of them manually with a typedef

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  • How can I force mod_perl to only allow one process per connection?

    - by Charles Ma
    I have a perl cgi script that's fairly resource intensive (takes about 2 seconds to finish). This is fine as long as only at most 4 or 5 of them are running at the same time and that's usually the case. The problem is that when a user clicks a link that calls this script, a new process is spawned to handle that connection request, so if a user clicks many times (if they're impatient), the server gets overloaded with new processes running and most of them are redundant. How can I ensure that only one instance of this process is running per host? This is an old system that I'm maintaining which uses an old framework for the frontend, and I would like to avoid using javascript to disable the button client side if possible. Converting this to fast-cgi perl is out of the question as well, again because this is an old system and adding fast-cgi to apache might break a lot of other things that this thing runs.

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  • Infinite loop when adding CATiledLayer to UIView

    - by Jean
    I have a UIView in which I add a CATiledLayer and implement 'drawLayer'. If I use a UIViewController and add the layer to a new subview of the controller, then everything is ok. If I however try to use a UIView to and do all the craetion and drawing within this, then I get a infinite loop at the point shown below when I add this view to a superview. 0x002cfafb <+0425> ja 0x2cfa23 <-[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:]+209> What am I missing?

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  • C# Random Number Generator getting stuck in a cycle

    - by Jean Azzopardi
    Hi, I am using .NET to create an artificial life program and I am using C#'s pseudo random class defined in a Singleton. The idea is that if I use the same random number generator throughout the application, I could merely save the seed and then reload from the seed to recompute a certain interesting run. public sealed class RandomNumberGenerator : Random { private static readonly RandomNumberGenerator instance = new RandomNumberGenerator(); RandomNumberGenerator() { } public static RandomNumberGenerator Instance { get { return instance; } } } I also wanted a method that could give me two different random numbers. public static Tuple<int, int> TwoDifferentRandomNumbers(this Random rnd, int minValue, int maxValue) { if (minValue >= maxValue) throw new ArgumentOutOfRangeException("maxValue", "maxValue must be greater than minValue"); if (minValue + 1 == maxValue) return Tuple.Create<int, int>(minValue, maxValue); int rnd1 = rnd.Next(minValue, maxValue); int rnd2 = rnd.Next(minValue, maxValue); while (rnd1 == rnd2) { rnd2 = rnd.Next(minValue, maxValue); } return Tuple.Create<int, int>(rnd1, rnd2); } The problem is that sometimes rnd.Next(minValue,maxValuealways returns minValue. If I breakpoint at this point and try creating a double and setting it to rnd.NextDouble(), it returns 0.0. Anyone know why this is happening? I know that it is a pseudo random number generator, but frankly, I hadn't expected it to lock at 0. The random number generator is being accessed from multiple threads... could this be the source of the problem?

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  • Get CLSID by PIA interface Type

    - by Charles
    How can I get the CLSID for a given interface within a Primary Interop Assembly? Here's what I'm talking about: // The c# compiler does some interesting magic. // The following code ... var app = new Microsoft.Office.Interop.Outlook.Application(); // ... is compiled like so (disassembled with Reflector): var app =((Microsoft.Office.Interop.Outlook.Application) Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("0006F03A-0000-0000-C000-000000000046")))); Microsoft.Office.Interop.Outlook.Application is an interface, and therefore it cannot be instantiated directly. What's interesting here is that c# lets you treat these COM interfaces as if there where classes that you can instantiate with the new keyword. What I want to know is, given the System.Type for a given interface, how can I get the CLSID? Note: I ultimately want to be able to create an instance given the interface's System.Type - I don't really care how. I'm assuming here that the easiest way to do this would be to get CLSID given the Type, just as the c# compiler does.

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  • combinations algorithm

    - by mysterious jean
    I want to make simple sorting algorithm. given the input "abcde", I would like the output below. could you tell me the algorithm for that? arr[0] = "a" arr[1] = "ab" arr[2] = "ac" arr[3] = "ad" arr[4] = "ae" arr[5] = "abc" arr[6] = "abd" arr[7] = "abe" ... arr[n] = "abcde" arr[n+1] = "b" arr[n+2] = "bc" arr[n+3] = "bd" arr[n+4] = "be" arr[n+5] = "bcd" arr[n+5] = "bce" arr[n+5] = "bde" ... arr[n+m] = "bcde" ... ...

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  • POSIX AIO Library and Callback Handlers

    - by Charles Salvia
    According to the documentation on aio_read/write, there are basically 2 ways that the AIO library can inform your application that an async file I/O operation has completed. Either 1) you can use a signal, 2) you can use a callback function I think that callback functions are vastly preferable to signals, and would probably be much easier to integrate into higher-level multi-threaded libraries. Unfortunately, the documentation for this functionality is a mess to say the least. Some sources, such as the man page for the sigevent struct, indicate that you need to set the sigev_notify data member in the sigevent struct to SIGEV_CALLBACK and then provide a function handler. Presumably, the handler is invoked in the same thread. Other documentation indicates you need to set sigev_notify to SIGEV_THREAD, which will invoke the callback handler in a newly created thread. In any case, on my Linux system (Ubuntu with a 2.6.28 kernel) SIGEV_CALLBACK doesn't seem to be defined anywhere, but SIGEV_THREAD works as advertised. Unfortunately, creating a new thread to invoke the callback handler seems really inefficient, especially if you need to invoke many handlers. It would be better to use an existing pool of threads, similar to the way most network I/O event demultiplexers work. Some versions of UNIX, such as QNX, include a SIGEV_SIGNAL_THREAD flag, which allows you to invoke handlers using a specified existing thread, but this doesn't seem to be available on Linux, nor does it seem to even be a part of the POSIX standard. So, is it possible to use the POSIX AIO library in a way that invokes user handlers in a pre-allocated background thread/threadpool, rather than creating/destroying a new thread everytime a handler is invoked?

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  • Detect and record a sound with python

    - by Jean-Pierre
    I'm using this program to record a sound in python: import pyaudio import wave import sys chunk = 1024 FORMAT = pyaudio.paInt16 CHANNELS = 1 RATE = 44100 RECORD_SECONDS = 5 WAVE_OUTPUT_FILENAME = "output.wav" p = pyaudio.PyAudio() stream = p.open(format = FORMAT, channels = CHANNELS, rate = RATE, input = True, frames_per_buffer = chunk) print "* recording" all = [] for i in range(0, RATE / chunk * RECORD_SECONDS): data = stream.read(chunk) all.append(data) print "* done recording" stream.close() p.terminate() write data to WAVE file data = ''.join(all) wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb') wf.setnchannels(CHANNELS) wf.setsampwidth(p.get_sample_size(FORMAT)) wf.setframerate(RATE) wf.writeframes(data) wf.close() I want to change the program to start recording when sound is detected by the sound card input. Probably should compare the input sound level in Chunk, but how do this?

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  • Poll multiple desktops/servers on a network remotely to determine the IP Type: Static or DHCP

    - by Charles Laird
    Had a gentleman answer 90% of my original question, which is to say I now have the ability to poll a device that I am running the below script on. The end goal is to obtain IP type: Static or DHCP on all desktop/servers on a network I support. I have the list of servers that I will input in a batch file, just looking for the code to actually poll the other devices on the network from one location. Output to be viewed: Device name: IP Address: MAC Address: Type: Marvell Yukon 88E8001/8003/8010 PCI Gigabit Ethernet Controller NULL 00:00:F3:44:C6:00 DHCP Generic Marvell Yukon 88E8056 based Ethernet Controller 192.168.1.102 00:00:F3:44:D0:00 DHCP ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration"); ManagementObjectCollection objMOC = objMC.GetInstances(); txtLaunch.Text = ("Name\tIP Address\tMAC Address\tType" +"\r\n"); foreach (ManagementObject objMO in objMOC) { StringBuilder builder = new StringBuilder(); object o = objMO.GetPropertyValue("IPAddress"); object m = objMO.GetPropertyValue("MACAddress"); if (o != null || m != null) { builder.Append(objMO["Description"].ToString()); builder.Append("\t"); if (o != null) builder.Append(((string[])(objMO["IPAddress"]))[0].ToString()); else builder.Append("NULL"); builder.Append("\t"); builder.Append(m.ToString()); builder.Append("\t"); builder.Append(Convert.ToBoolean(objMO["DHCPEnabled"]) ? "DHCP" : "Static"); builder.Append("\r\n"); } txtLaunch.Text = txtLaunch.Text + (builder.ToString()); I'm open to recommendations here.

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  • OpenCV - DLL missing, but it's not?

    - by charles-22
    I am trying just a basic program with OpenCV with the following code: #include "cv.h" #include "highgui.h" int main() { IplImage* newImg; newImg = cvLoadImage("~/apple.bmp", 1); cvNamedWindow("Window", 1); cvShowImage("Window", newImg); cvWaitKey(0); cvDestroyWindow("Window"); cvReleaseImage(&newImg); return 0; } When I run this, I get The program can't start because libcxcore200.dll is missing from your computer. Try reinstalling the program to fix this problem. However, I can see this DLL. It exists. I have added the following to the input dependencies for my linker C:\OpenCV2.0\lib\libcv200.dll.a C:\OpenCV2.0\lib\libcvaux200.dll.a C:\OpenCV2.0\lib\libcxcore200.dll.a C:\OpenCV2.0\lib\libhighgui200.dll.a What gives? I'm using visual studio 2008.

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  • Marking multi-level nested forms as "dirty" in Rails

    - by Charles Kihe
    I have a three-level multi-nested form in Rails. The setup is like this: Projects have many Milestones, and Milestones have many Notes. The goal is to have everything editable within the page with JavaScript, where we can add multiple new Milestones to a Project within the page, and add new Notes to new and existing Milestones. Everything works as expected, except that when I add new notes to an existing Milestone (new Milestones work fine when adding notes to them), the new notes won't save unless I edit any of the fields that actually belong to the Milestone to mark the form "dirty"/edited. Is there a way to flag the Milestone so that the new Notes that have been added will save? Edit: sorry, it's hard to paste in all of the code because there's so many parts, but here goes: Models class Project < ActiveRecord::Base has_many :notes, :dependent => :destroy has_many :milestones, :dependent => :destroy accepts_nested_attributes_for :milestones, :allow_destroy => true accepts_nested_attributes_for :notes, :allow_destroy => true, :reject_if => proc { |attributes| attributes['content'].blank? } end class Milestone < ActiveRecord::Base belongs_to :project has_many :notes, :dependent => :destroy accepts_nested_attributes_for :notes, :allow_destroy => true, :allow_destroy => true, :reject_if => proc { |attributes| attributes['content'].blank? } end class Note < ActiveRecord::Base belongs_to :milestone belongs_to :project scope :newest, lambda { |*args| order('created_at DESC').limit(*args.first || 3) } end I'm using an jQuery-based, unobtrusive version of Ryan Bates' combo helper/JS code to get this done. Application Helper def add_fields_for_association(f, association, partial) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| render(partial, :f => builder) end end I render the form for the association in a hidden div, and then use the following JavaScript to find it and add it as needed. JavaScript function addFields(link, association, content, func) { var newID = new Date().getTime(); var regexp = new RegExp("new_" + association, "g"); var form = content.replace(regexp, newID); var link = $(link).parent().next().before(form).prev(); if (func) { func.call(); } return link; } I'm guessing the only other relevant piece of code that I can think of would be the create method in the NotesController: def create respond_with(@note = @owner.notes.create(params[:note])) do |format| format.js { render :json => @owner.notes.newest(3).all.to_json } format.html { redirect_to((@milestone ? [@project, @milestone, @note] : [@project, @note]), :notice => 'Note was successfully created.') } end end The @owner ivar is created in the following before filter: def load_milestone @milestone = @project.milestones.find(params[:milestone_id]) if params[:milestone_id] end def determine_owner @owner = load_milestone @owner ||= @project end Thing is, all this seems to work fine, except when I'm adding new notes to existing milestones. The milestone has to be "touched" in order for new notes to save, or else Rails won't pay attention.

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  • Lazy load pages in UIScrollView

    - by jean
    I have a UIScrollView that contains large images and am using paging to scroll between images. In order to save memory, I am loading only one image before and after the currently visible one and loading/releasing new images after a scroll has completed. The problem occurs when one scrolls quickly and scrollViewDidEndDecelerating is not called. How can I detect continuous scrolling? I could check item location on every scrollViewDidScroll but this seems a bit heavy...

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  • How do I fix incorrect inline Javascript indentation in Vim?

    - by Charles Roper
    I can't seem to get inline Javascript indenting properly in Vim. Consider the following: $(document).ready(function() { // Closing brace correctly indented $("input").focus(function() { $(this).closest("li").addClass("cur-focus"); }); // <-- I had to manually unindent this // Closing brace incorrectly indented $("input").blur(function() { $(this).closest("li").removeClass("cur-focus"); }); // <-- This is what it does by default. Argh! }); Vim seems to insist on automatically indenting the closing brace shown in the second case there. It does the same if I re-indent the whole file. How do I get it to automatically indent using the more standard JS indenting style seen in the first case?

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  • Image displays when clicked with multiple radio button groups

    - by Jean
    I'm creating a form that has seven different selection groups, most with radio buttons (ie: buns, cheese), a couple with check boxes (toppings). I need jQuery to differentiate the groups and display images when clicked. The value can't be part of the code as I use it as part of the php form in the next page. <html> <head> <script src="js/jquery-1.6.1.min.js" type="text/javascript"></script> </head> <body> <div id="myRadioGroup"> <input type="radio" name="cars" value="American" />Yellow American<br /> <input type="radio" name="cars" value="Swiss" />Jarlsberg Swiss<br /> <input type="radio" name="cars" value="Blue" />Blue<br /> <input type="radio" name="cars" value="Cheddar" />Aged Cheddar<br /> <div id="American" class="desc"><img class="item" src="images/american-cheese-slice.png"></div> <div id="Swiss" class="desc"><img class="item" src="images/swisscheese.png"></div> <div id="Blue" class="desc"><img class="item" src="images/bluecheese.png"></div> <div id="Cheddar" class="desc"><img class="item" src="images/agedcheddar.png"></div> </div> <div id="myBunGroup"> <input type="radio" name="buns" value="Whole Wheat" />Whole Wheat<br /> <input type="radio" name="buns" value="Classic" />Classic<br /> <input type="radio" name="buns" value="Gluten Free" />Gluten Free<br /> <input type="radio" name="buns" value="Wrap" />Wrap<br /> <div id="WholeWheat" class="desc"><img class="item" src="images/wholewheat.png"></div> <div id="Classic" class="desc"><img class="item" src="images/classic.png"></div> <div id="GlutenFree" class="desc"><img class="item" src="images/gf-buns.png"></div> <div id="Wrap" class="desc"><img class="item" src="images/tortilla.png"></div> </div> <div id="myToppingGroup"> </div> <!-- http://stackoverflow.com/questions/5940963/jquery-show-and-hide-divs-based-on-radio-button-click --> <script> $(document).ready(function() { $(".item").hide(); $("input[name$="['cars', 'buns']"]").click(function() { var test = $(this).val(); $(".item").hide(); $("#" + test).show(); }); }); </script> </body> </html>

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  • What non-programming books should programmers read?

    - by Charles Roper
    This is a poll asking the Stackoverflow community what non-programming books they would recommend to fellow programmers. Please read the following before posting: Please post only ONE BOOK PER ANSWER. Please search for your recommendation on this page before posting (there are over NINE PAGES so it is advisable to check them all). Many books have already been suggested and we want to avoid duplicates. If you find your recommendation is already present, vote it up or add some commentary. Please elaborate on why you think a given book is worth reading from a programmer's perspective. This poll is now community editable, so you can edit this question or any of the answers. Note: this article is similar and contains other useful suggestions.

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  • Calling unmanaged dll from C#. Take 2

    - by Charles Gargent
    I have written a c# program that calls a c++ dll that echoes the commandline args to a file When the c++ is called using the rundll32 command it displays the commandline args no problem, however when it is called from within the c# it doesnt. I asked this question to try and solve my problem, but I have modified it my test environment and I think it is worth asking a new question. Here is the c++ dll #include "stdafx.h" #include "stdlib.h" #include <stdio.h> #include <iostream> #include <fstream> using namespace std; BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { return TRUE; } extern "C" __declspec(dllexport) int WINAPI CMAKEX( HWND hwnd, HINSTANCE hinst, LPCSTR lpszCommandLine, DWORD dwReserved) { ofstream SaveFile("output.txt"); SaveFile << lpszCommandLine; SaveFile.close(); return 0; } Here is the c# app using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.Runtime.InteropServices; using System.Net; namespace nac { class Program { [DllImport("cmakca.dll", SetLastError = true, CharSet = CharSet.Unicode)] static extern bool CMAKEX(IntPtr hwnd, IntPtr hinst, string lpszCmdLine, int nCmdShow); static void Main(string[] args) { string cmdLine = @"/source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp"""; const int SW_SHOWNORMAL = 1; CMAKEX(IntPtr.Zero, IntPtr.Zero, cmdLine, SW_SHOWNORMAL).ToString(); } } } The output from the rundll32 command is rundll32 cmakex.dll,CMAKEX /source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp" /source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp" however the output when the c# app runs is /

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  • How to make efficient code emerge through unit testing

    - by Jean
    Hi, I participate in a TDD Coding Dojo, where we try to practice pure TDD on simple problems. It occured to me however that the code which emerges from the unit tests isn't the most efficient. Now this is fine most of the time, but what if the code usage grows so that efficiency becomes a problem. I love the way the code emerges from unit testing, but is it possible to make the efficiency property emerge through further tests ? Here is a trivial example in ruby: prime factorization. I followed a pure TDD approach making the tests pass one after the other validating my original acceptance test (commented at the bottom). What further steps could I take, if I wanted to make one of the generic prime factorization algorithms emerge ? To reduce the problem domain, let's say I want to get a quadratic sieve implementation ... Now in this precise case I know the "optimal algorithm, but in most cases, the client will simply add a requirement that the feature runs in less than "x" time for a given environment. require 'shoulda' require 'lib/prime' class MathTest < Test::Unit::TestCase context "The math module" do should "have a method to get primes" do assert Math.respond_to? 'primes' end end context "The primes method of Math" do should "return [] for 0" do assert_equal [], Math.primes(0) end should "return [1] for 1 " do assert_equal [1], Math.primes(1) end should "return [1,2] for 2" do assert_equal [1,2], Math.primes(2) end should "return [1,3] for 3" do assert_equal [1,3], Math.primes(3) end should "return [1,2] for 4" do assert_equal [1,2,2], Math.primes(4) end should "return [1,5] for 5" do assert_equal [1,5], Math.primes(5) end should "return [1,2,3] for 6" do assert_equal [1,2,3], Math.primes(6) end should "return [1,3] for 9" do assert_equal [1,3,3], Math.primes(9) end should "return [1,2,5] for 10" do assert_equal [1,2,5], Math.primes(10) end end # context "Functionnal Acceptance test 1" do # context "the prime factors of 14101980 are 1,2,2,3,5,61,3853"do # should "return [1,2,3,5,61,3853] for ${14101980*14101980}" do # assert_equal [1,2,2,3,5,61,3853], Math.primes(14101980*14101980) # end # end # end end and the naive algorithm I created by this approach module Math def self.primes(n) if n==0 return [] else primes=[1] for i in 2..n do if n%i==0 while(n%i==0) primes<<i n=n/i end end end primes end end end

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  • change image upon selection, searching list for the src value jQuery

    - by Charles Marsh
    Hello all, Can anyone see anything that is wrong with this code it just isn't working... Should be clear what I am trying to do jQuery(document).ready(function($) { $('#product-variants-option-0').change(function() { // What is the sku of the current variant selection. var select_value = $(this).find(':selected').val(); if (select_value == "Kelly Green") { var keyword = "kly"; }; var new_src = $('#preload img[src*="kly"]'); $('div.image').attr('src', new_src); }); }); The selection: <select class="single-option-selector-0" id="product-variants-option-0"> <option value="Kelly Green">Kelly Green</option> <option value="Navy">Navy</option> <option value="Olive">Olive</option> <option value="Cocoa">Cocoa</option> </select> I'm trying to search an unordered list: <ul id="preload" style="display:none;"> <li>0z-kelly-green-medium.jpg</li> <li>0z-olive-medium.jpg</li> </ul>

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