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• MVVM - child windows and data contexts

  - by GlenH7

  Should a child window have it's own data context (View-Model) or use the data context of the parent? More broadly, should each View have its own View-Model? Are there are any rules to guide making that decision? What if the various View-Models will be accessing the same Model? I haven't been able to find any consistent guidance on my question. The MS definition of MVVM appears to be silent on child windows. For one example, I have created a warning message notification View. It really didn't need a data context since it was passed the message to display. But if I needed to fancy it up a bit, I would have tapped the parent's data context. I have run into another scenario that needs a child window and is more complicated than the notification box. The parent's View-Model is already getting cluttered, so I had planned on generating a dedicated VM for the child window. But I can't find any guidance on whether this is a good idea or what the potential consequences may be. FWIW, I happen to be working in Silverlight, but I don't know that this question is strictly a Silverlight issue.

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• Can I make a Compiz animation rule for Wine menus?

  - by satuon

  Wine menus appear and disappear with the "Glide 2" effect. This looks good for dialogs but not so good for menus. Can I make a custom rule to apply fade in/out instead? I include the animation section from my exported Compiz settings (default values are skipped): [animation] s0_open_matches = ((type=Dialog | ModalDialog | Normal | Unknown) | name=sun-awt-X11-XFramePeer | name=sun-awt-X11-XDialogPeer) & !(role=toolTipTip | role=qtooltip_label) & !(type=Normal & override_redirect=1) & !(name=gnome-screensaver);(type=Menu | PopupMenu | DropdownMenu | Dialog | ModalDialog | Normal);(type=Tooltip | Notification | Utility) & !(name=compiz) & !(title=notify-osd); s0_close_effects = animation:Glide 2;animation:Fade;animation:None; s0_close_matches = ((type=Dialog | ModalDialog | Normal | Unknown) | name=sun-awt-X11-XFramePeer | name=sun-awt-X11-XDialogPeer) & !(role=toolTipTip | role=qtooltip_label) & !(type=Normal & override_redirect=1) & !(name=gnome-screensaver);(type=Menu | PopupMenu | DropdownMenu | Dialog | ModalDialog | Normal);(type=Tooltip | Notification | Utility) & !(name=compiz) & !(title=notify-osd);

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• Skype sounds sizzle/distorted/bad

  - by Filubuntu

  I have the same problem as described in the questions skype notification sounds sizzled and bad sound on login to skype. But it is not only the login, notification, but also when talking to somebody. I tried the solution to remove/re-install skype and most of the solutions in this questions, e.g. checking mixer, sound settings and installing alsa-hda-dkms (incl. system restart). After installing skype (and even after upgrade to skype 4.0) in Ubuntu 12.04 (AMD 64) there was no sound at all. I followed the first step of the SoundTroubleshootingProcedure and at least there is now sound: sudo add-apt-repository ppa:ubuntu-audio-dev/ppa; sudo apt-get update;sudo apt-get dist-upgrade; sudo apt-get install linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; sudo apt-get -y --reinstall install linux-sound-base alsa-base alsa-utils gdm ubuntu-desktop linux-image-`uname -r` libasound2; killall pulseaudio; rm -r ~/.pulse*; sudo usermod -aG `cat /etc/group | grep -e '^pulse:' -e '^audio:' -e '^pulse-access:' -e '^pulse-rt:' -e '^video:' | awk -F: '{print $1}' | tr '\n' ',' | sed 's:,$::g'` `whoami` The jittering sound would sometimes disappear, e.g. on the Echo-Testcall after replaying the recorded part. And I noticed that if I let music play in the rhythmbox and then start skype, the sound is fine. So I have a weak solution, but I would be glad it would work without this detour. As requested: My sound card is a an "AMD High Definition Audio Device" called Advanced Micro Devices (AMD) Hudson Azalia controller (rev01), subsystem Lenovo Device 21ea (according to sysinfo) on a Lenovo Thinkpad Edge 525.

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• Struggles to connect to network when using WPA with a BCM43225

  - by pst007x

  When booting my laptop, it will try to connect to my wireless network, however a window keeps popping up asking me for my security password, which has already been saved. I have to keep deleting my network settings, and reconnecting, otherwise it keeps failing to connect. My wireless is set up with a WPA, I do not want to lower my security because of this, but it is a pain and can take me 15mins plus to finally connect. The problem has only become apparent since a fresh install of 11.10. IPV6 disabled. System info: 01:00.0 Ethernet controller: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe (rev 01) Subsystem: Acer Incorporated [ALI] Device 036d Flags: bus master, fast devsel, latency 0, IRQ 43 Memory at b3400000 (64-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: tg3 Kernel modules: tg3 02:00.0 Network controller: Broadcom Corporation BCM43225 802.11b/g/n (rev 01) Subsystem: Broadcom Corporation Device 04da Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at b2400000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: brcmsmac Kernel modules: wl, brcmsmac ADDITIONAL: In terminal I get this: pst007x@pst007x-ubuntu64:~$ nm-applet start ** Message: applet now removed from the notification area ** (nm-applet:2816): DEBUG: old state indicates that this was not a disconnect 0 ** Message: using fallback from indicator to GtkStatusIcon ** Message: applet now embedded in the notification area ** Message: No keyring secrets found for Auto Access 01/802-11-wireless-security; asking user. ** (nm-applet:2816): DEBUG: foo_client_state_changed_cb Note this line: ** Message: No keyring secrets found for Auto Access 01/802-11-wireless-security; asking user. At this point is where I am asked for the password. Please report WPA issues with Ubuntu 11.10 here: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/892727

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• JSON Support in Azure

  - by kaleidoscope

  Please find how we call JavaScript Object Notation in cloud applications. As we all know how client script is useful in web applications in terms of performance.           Same we can use JQuery in Asp.net using Cloud  computing which will  asynchronously pull any messages out of the table(cloud storage)  and display them in the     browser by invoking a method on a controller that returns JavaScript Object Notation (JSON) in a well-known shape. Syntax : Suppose we want to write a  JQuery function which return some notification while end user interact with our application so use following syntax : public JsonResult GetMessages() {      if (User.Identity.IsAuthenticated)      {     UserTextNotification[] userToasts =           toastRepository.GetNotifications(User.Identity.Name);          object[] data =          (from UserTextNotification toast in userToasts          select new { title = toast.Title ?? "Notification",          text = toast.MessageText }).ToArray();           return Json(data, JsonRequestBehavior.AllowGet);      }         else            return Json(null); } Above function is used to check authentication and display message if user is not exists in Table. Plateform :   ASP.NET 3.5  MVC 1   Under Visual Studio 2008  . Please find below link for more detail : http://msdn.microsoft.com/en-us/magazine/ee335721.aspx   Chandraprakash, S

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• How do I give Ubuntu 10.10 more space (when installed inside Windows 7 (via wubi))?

  - by Pavitar

  I had installed Ubuntu inside Windows XP but then I formatted XP and installed Windows 7. EDIT1: I used Wubi for the same. I want to know which one of the two will solve my problem? creating a virtual disk or resizing root? Also is resizing root possible as the 4GB ext4 partition is already in a NTFS format Hard Drive partition. At the time of installation I had allocated only 4GB of space to Ubuntu. I want to increase that size as I keep getting a low disk space notification. I have surfed through a lot of similar questions but this is not a duplicate. Because I want to know a little about the file systems. In order to solve my problem,do I have to increase the size of root.disk? Or will it be solved by creating a virtual disk? Also I want to know the difference between creating a virtual disk and just increasing disk space of root.I'm new to Ubuntu so I don't know how the file systems function. EDIT2:I have created a virtual disk of 10gb ,but I'm still getting the same notification.Is there anyway to install all further applications on the virtual disk I created?

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• Example: Cross Cutting Concerns of an Application

  A little while ago I was given an opportunity to design and implement a new system that sent data via an HTTP Post method and then processed the results that were returned so that they could be inserted in to a database. My system had eight core concerns that it needed to fulfill. Eight Core Concerns Database Access Data Entities Worker Result Processing Process Flow Manager Email/Notification Error Handling Logging Of these eight, five were actually cross cutting concerns. 5 Cross Cutting Concerns Database Access Data Entities Email/Notification Error Handling Logging These five cross cutting concerns were determined after I created an aspect oriented model to help identity the system components that could be factored out into separate components.  These separated components would then be included in the system so that they could be used by various other components.  These five components allow all of the other components to access the database, store data, send notifications, handle errors, and log all system events.  Thus, these components are used to share unique aspects to the system via their implementation. The use of Aspect oriented architecture greatly helped me define what components I needed to create and what each of those components could do.  It also showed how all of the other aspects depended on each other so that each component did not have to re-implement code that was already created in the existing system.

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• BUILD 2013 Session&ndash;Alive With Activity

  - by Tim Murphy

  Originally posted on: http://geekswithblogs.net/tmurphy/archive/2013/06/27/build-2013-sessionndashalive-with-activity.aspx Live tiles are what really add a ton of value to both Windows 8 and Windows Phone.  As a developer it is important that you leverage this capability in order to make your apps more informative and give your users a reason to keep opening the app to find out details hinted at by tile updates. In this session Kraig Brockschmidt cover a wide array of dos and don’ts for implementing live tiles.  I was actually worried whether I would get much out of this session when Kraig started it off with the fact that his background is in HTML5 based apps which I have little interest in, but the subject almost didn’t come up during his talk.  It focused on things like making sure you have all the right size graphics and implementing all of the tile event handlers.  The session went on to discuss the message format for push notification and implementing lock screen notification and badges. As with the other day 1 sessions it was like drinking from a fire hose, but it was good stuff.  Check it out when they post it on Channel 9. del.icio.us Tags: BUILD 2013,Live Tiles,Windows 8.1

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• One sentence descriptions of the various common software licenses?

  - by Rich

  Instead of having to read entire documentation and sift through all the legalese, can someone outline the more common licenses in language that is short and sweet and gets right to the point? Specifically, I'm using a 3rd party control that uses the Apache 2.0 license. My intention is to use this in a proprietary application that I am building for a corporation's use (not resold, but I'm being paid for my work). Does this mean I can or cannot use this control? Does it mean that I must maintain copyright/license information in my code? Does it mean that I must mention copyright/license information in a clearly visible location in the app? EDIT In response to an answer below with a link to an article by Jeff Atwood, the Apache license is described as follows: Apache License Open Permissive 9 Requires derivative works to provide notification of any licensed or proprietary code in a common location. Does this notification need to be in a "common location" in my source code or a common location visible within the app? What if this were a non GUI app (I'm assuming that could very well be my answer)? Thanks for the responses!!!

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• Help with Boost Grammar

  - by Decmanc04

  I have been using the following win32 console code to try to parse a B Machine Grammar embedded within C++ using Boost Spirit grammar template. I am a relatively new Boost user. The code compiles, but when I run the .exe file produced by VC++2008, the program partially parses the input file. I believe the problem is with my grammar definition or the functions attached as semantic atctions. The code is given below: // BIFAnalyser.cpp : Defines the entry point for the console application. // // /*============================================================================= Copyright (c) Temitope Jos Onunkun 2010 http://www.dcs.kcl.ac.uk/pg/onun/ Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ //////////////////////////////////////////////////////////////////////////// // // // B Machine parser using the Boost "Grammar" and "Semantic Actions". // // // //////////////////////////////////////////////////////////////////////////// #include <boost/spirit/core.hpp> #include <boost/tokenizer.hpp> #include <iostream> #include <string> #include <fstream> #include <vector> #include <utility> /////////////////////////////////////////////////////////////////////////////////////////// using namespace std; using namespace boost::spirit; /////////////////////////////////////////////////////////////////////////////////////////// // // Semantic actions // //////////////////////////////////////////////////////////////////////////// vector<string> strVect; namespace { //semantic action function on individual lexeme void do_noint(char const* str, char const* end) { string s(str, end); if(atoi(str)) { ; } else { strVect.push_back(s); cout << "PUSH(" << s << ')' << endl; } } //semantic action function on addition of lexemes void do_add(char const*, char const*) { cout << "ADD" << endl; for(vector<string>::iterator vi = strVect.begin(); vi < strVect.end(); ++vi) cout << *vi << " "; } //semantic action function on subtraction of lexemes void do_subt(char const*, char const*) { cout << "SUBTRACT" << endl; for(vector<string>::iterator vi = strVect.begin(); vi < strVect.end(); ++vi) cout << *vi << " "; } //semantic action function on multiplication of lexemes void do_mult(char const*, char const*) { cout << "\nMULTIPLY" << endl; for(vector<string>::iterator vi = strVect.begin(); vi < strVect.end(); ++vi) cout << *vi << " "; cout << "\n"; } //semantic action function on division of lexemes void do_div(char const*, char const*) { cout << "\nDIVIDE" << endl; for(vector<string>::iterator vi = strVect.begin(); vi < strVect.end(); ++vi) cout << *vi << " "; } //semantic action function on simple substitution void do_sSubst(char const* str, char const* end) { string s(str, end); //use boost tokenizer to break down tokens typedef boost::tokenizer<boost::char_separator<char> > Tokenizer; boost::char_separator<char> sep("-+/*:=()"); // default char separator Tokenizer tok(s, sep); Tokenizer::iterator tok_iter = tok.begin(); pair<string, string > dependency; //create a pair object for dependencies //save first variable token in simple substitution dependency.first = *tok.begin(); //create a vector object to store all tokens vector<string> dx; // for( ; tok_iter != tok.end(); ++tok_iter) //save all tokens in vector { dx.push_back(*tok_iter ); } vector<string> d_hat; //stores set of dependency pairs string dep; //pairs variables as string object for(int unsigned i=1; i < dx.size()-1; i++) { dependency.second = dx.at(i); dep = dependency.first + "|->" + dependency.second + " "; d_hat.push_back(dep); } cout << "PUSH(" << s << ')' << endl; for(int unsigned i=0; i < d_hat.size(); i++) cout <<"\n...\n" << d_hat.at(i) << " "; cout << "\nSIMPLE SUBSTITUTION\n"; } //semantic action function on multiple substitution void do_mSubst(char const* str, char const* end) { string s(str, end); //use boost tokenizer to break down tokens typedef boost::tokenizer<boost::char_separator<char> > Tok; boost::char_separator<char> sep("-+/*:=()"); // default char separator Tok tok(s, sep); Tok::iterator tok_iter = tok.begin(); // string start = *tok.begin(); vector<string> mx; for( ; tok_iter != tok.end(); ++tok_iter) //save all tokens in vector { mx.push_back(*tok_iter ); } mx.push_back("END\n"); //add a marker "end" for(unsigned int i=0; i<mx.size(); i++) { // if(mx.at(i) == "END" || mx.at(i) == "||" ) // break; // else if( mx.at(i) == "||") // do_sSubst(str, end); // else // { // do_sSubst(str, end); // } cout << "\nTokens ... " << mx.at(i) << " "; } cout << "PUSH(" << s << ')' << endl; cout << "MULTIPLE SUBSTITUTION\n"; } } //////////////////////////////////////////////////////////////////////////// // // Simple Substitution Grammar // //////////////////////////////////////////////////////////////////////////// // Simple substitution grammar parser with integer values removed struct Substitution : public grammar<Substitution> { template <typename ScannerT> struct definition { definition(Substitution const& ) { multi_subst = (simple_subst [&do_mSubst] >> +( str_p("||") >> simple_subst [&do_mSubst]) ) ; simple_subst = (Identifier >> str_p(":=") >> expression)[&do_sSubst] ; Identifier = alpha_p >> +alnum_p//[do_noint] ; expression = term >> *( ('+' >> term)[&do_add] | ('-' >> term)[&do_subt] ) ; term = factor >> *( ('*' >> factor)[&do_mult] | ('/' >> factor)[&do_div] ) ; factor = lexeme_d[( (alpha_p >> +alnum_p) | +digit_p)[&do_noint]] | '(' >> expression >> ')' | ('+' >> factor) ; } rule<ScannerT> expression, term, factor, Identifier, simple_subst, multi_subst ; rule<ScannerT> const& start() const { return multi_subst; } }; }; //////////////////////////////////////////////////////////////////////////// // // Main program // //////////////////////////////////////////////////////////////////////////// int main() { cout << "************************************************************\n\n"; cout << "\t\t...Machine Parser...\n\n"; cout << "************************************************************\n\n"; // cout << "Type an expression...or [q or Q] to quit\n\n"; //prompt for file name to be input cout << "Please enter a filename...or [q or Q] to quit:\n\n "; char strFilename[256]; //file name store as a string object cin >> strFilename; ifstream inFile(strFilename); // opens file object for reading //output file for truncated machine (operations only) Substitution elementary_subst; // Simple substitution parser object string str, next; // inFile.open(strFilename); while (inFile >> str) { getline(cin, next); str += next; if (str.empty() || str[0] == 'q' || str[0] == 'Q') break; parse_info<> info = parse(str.c_str(), elementary_subst, space_p); if (info.full) { cout << "\n-------------------------\n"; cout << "Parsing succeeded\n"; cout << "\n-------------------------\n"; } else { cout << "\n-------------------------\n"; cout << "Parsing failed\n"; cout << "stopped at: \": " << info.stop << "\"\n"; cout << "\n-------------------------\n"; } } cout << "Please enter a filename...or [q or Q] to quit\n"; cin >> strFilename; return 0; } The contents of the file I tried to parse, which I named "mf7.txt" is given below: debt:=(LoanRequest+outstandingLoan1)*20 || newDebt := loanammount-paidammount The output when I execute the program is: ************************************************************ ...Machine Parser... ************************************************************ Please enter a filename...or [q or Q] to quit: c:\tplat\mf7.txt PUSH(LoanRequest) PUSH(outstandingLoan1) ADD LoanRequest outstandingLoan1 MULTIPLY LoanRequest outstandingLoan1 PUSH(debt:=(LoanRequest+outstandingLoan1)*20) ... debt|->LoanRequest ... debt|->outstandingLoan1 SIMPLE SUBSTITUTION Tokens ... debt Tokens ... LoanRequest Tokens ... outstandingLoan1 Tokens ... 20 Tokens ... END PUSH(debt:=(LoanRequest+outstandingLoan1)*20) MULTIPLE SUBSTITUTION ------------------------- Parsing failedstopped at: ": " ------------------------- My intention is to capture only the variables in the file, which I managed to do up to the "||" string. Clearly, the program is not parsing beyond the "||" string in the input file. I will appreciate assistance to fix the grammar. SOS, please.

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• pre-commit hook in svn: could not be translated from the native locale to UTF-8

  - by Alexandre Moraes

  Hi everybody, I have a problem with my pre-commit hook. This hook test if a file is locked when the user commits. When a bad condition happens, it should output that the another user is locking this file or if nobody is locking, it should show "you are not locking this file message (file´s name)". The error happens when the file´s name has some latin character like "ç" and tortoise show me this in the output. Commit failed (details follow): Commit blocked by pre-commit hook (exit code 1) with output: [Erro output could not be translated from the native locale to UTF-8.] Do you know how can I solve this? Thanks, Alexandre My shell script is here: #!/bin/sh REPOS="$1" TXN="$2" export LANG="en_US.UTF-8" /app/svn/hooks/ensure-has-need-lock.pl "$REPOS" "$TXN" if [ $? -ne 0 ]; then exit 1; fi exit 0 And my perl is here: !/usr/bin/env perl #Turn on warnings the best way depending on the Perl version. BEGIN { if ( $] >= 5.006_000) { require warnings; import warnings; } else { $^W = 1; } } use strict; use Carp; &usage unless @ARGV == 2; my $repos = shift; my $txn = shift; my $svnlook = "/usr/local/bin/svnlook"; my $user; my $ok = 1; foreach my $program ($svnlook) { if (-e $program) { unless (-x $program) { warn "$0: required program $program' is not executable, ", "edit $0.\n"; $ok = 0; } } else { warn "$0: required program $program' does not exist, edit $0.\n"; $ok = 0; } } exit 1 unless $ok; unless (-e $repos){ &usage("$0: repository directory $repos' does not exist."); } unless (-d $repos){ &usage("$0: repository directory $repos' is not a directory."); } foreach my $user_tmp (&read_from_process($svnlook, 'author', $repos, '-t', $txn)) { $user = $user_tmp; } my @errors; foreach my $transaction (&read_from_process($svnlook, 'changed', $repos, '-t', $txn)){ if ($transaction =~ /^U. (.*[^\/])$/){ my $file = $1; my $err = 0; foreach my $locks (&read_from_process($svnlook, 'lock', $repos, $file)){ $err = 1; if($locks=~ /Owner: (.*)/){ if($1 != $user){ push @errors, "$file : You are not locking this file!"; } } } if($err==0){ push @errors, "$file : You are not locking this file!"; } } elsif($transaction =~ /^D. (.*[^\/])$/){ my $file = $1; my $tchan = &read_from_process($svnlook, 'lock', $repos, $file); foreach my $locks (&read_from_process($svnlook, 'lock', $repos, $file)){ push @errors, "$1 : cannot delete locked Files"; } } elsif($transaction =~ /^A. (.*[^\/])$/){ my $needs_lock; my $path = $1; foreach my $prop (&read_from_process($svnlook, 'proplist', $repos, '-t', $txn, '--verbose', $path)){ if ($prop =~ /^\s*svn:needs-lock : (\S+)/){ $needs_lock = $1; } } if (not $needs_lock){ push @errors, "$path : svn:needs-lock is not set. Pleas ask TCC for support."; } } } if (@errors) { warn "$0:\n\n", join("\n", @errors), "\n\n"; exit 1; } else { exit 0; } sub usage { warn "@_\n" if @_; die "usage: $0 REPOS TXN-NAME\n"; } sub safe_read_from_pipe { unless (@_) { croak "$0: safe_read_from_pipe passed no arguments.\n"; } print "Running @_\n"; my $pid = open(SAFE_READ, '-|'); unless (defined $pid) { die "$0: cannot fork: $!\n"; } unless ($pid) { open(STDERR, ">&STDOUT") or die "$0: cannot dup STDOUT: $!\n"; exec(@_) or die "$0: cannot exec @_': $!\n"; } my @output; while (<SAFE_READ>) { chomp; push(@output, $_); } close(SAFE_READ); my $result = $?; my $exit = $result >> 8; my $signal = $result & 127; my $cd = $result & 128 ? "with core dump" : ""; if ($signal or $cd) { warn "$0: pipe from @_' failed $cd: exit=$exit signal=$signal\n"; } if (wantarray) { return ($result, @output); } else { return $result; } } sub read_from_process { unless (@_) { croak "$0: read_from_process passed no arguments.\n"; } my ($status, @output) = &safe_read_from_pipe(@_); if ($status) { if (@output) { die "$0: @_' failed with this output:\n", join("\n", @output), "\n"; } else { die "$0: @_' failed with no output.\n"; } } else { return @output; } }

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• Multiple setInterval in a HTML5 Canvas game

  - by kushsolitary

  I'm trying to achieve multiple animations in a game that I am creating using Canvas (it is a simple ping-pong game). This is my first game and I am new to canvas but have created a few experiments before so I have a good knowledge about how canvas work. First, take a look at the game here. The problem is, when the ball hits the paddle, I want a burst of n particles at the point of contact but that doesn't came right. Even if I set the particles number to 1, they just keep coming from the point of contact and then hides automatically after some time. Also, I want to have the burst on every collision but it occurs on first collision only. I am pasting the code here: //Initialize canvas var canvas = document.getElementById("canvas"), ctx = canvas.getContext("2d"), W = window.innerWidth, H = window.innerHeight, particles = [], ball = {}, paddles = [2], mouse = {}, points = 0, fps = 60, particlesCount = 50, flag = 0, particlePos = {}; canvas.addEventListener("mousemove", trackPosition, true); //Set it's height and width to full screen canvas.width = W; canvas.height = H; //Function to paint canvas function paintCanvas() { ctx.globalCompositeOperation = "source-over"; ctx.fillStyle = "black"; ctx.fillRect(0, 0, W, H); } //Create two paddles function createPaddle(pos) { //Height and width this.h = 10; this.w = 100; this.x = W/2 - this.w/2; this.y = (pos == "top") ? 0 : H - this.h; } //Push two paddles into the paddles array paddles.push(new createPaddle("bottom")); paddles.push(new createPaddle("top")); //Setting up the parameters of ball ball = { x: 2, y: 2, r: 5, c: "white", vx: 4, vy: 8, draw: function() { ctx.beginPath(); ctx.fillStyle = this.c; ctx.arc(this.x, this.y, this.r, 0, Math.PI*2, false); ctx.fill(); } }; //Function for creating particles function createParticles(x, y) { this.x = x || 0; this.y = y || 0; this.radius = 0.8; this.vx = -1.5 + Math.random()*3; this.vy = -1.5 + Math.random()*3; } //Draw everything on canvas function draw() { paintCanvas(); for(var i = 0; i < paddles.length; i++) { p = paddles[i]; ctx.fillStyle = "white"; ctx.fillRect(p.x, p.y, p.w, p.h); } ball.draw(); update(); } //Mouse Position track function trackPosition(e) { mouse.x = e.pageX; mouse.y = e.pageY; } //function to increase speed after every 5 points function increaseSpd() { if(points % 4 == 0) { ball.vx += (ball.vx < 0) ? -1 : 1; ball.vy += (ball.vy < 0) ? -2 : 2; } } //function to update positions function update() { //Move the paddles on mouse move if(mouse.x && mouse.y) { for(var i = 1; i < paddles.length; i++) { p = paddles[i]; p.x = mouse.x - p.w/2; } } //Move the ball ball.x += ball.vx; ball.y += ball.vy; //Collision with paddles p1 = paddles[1]; p2 = paddles[2]; if(ball.y >= p1.y - p1.h) { if(ball.x >= p1.x && ball.x <= (p1.x - 2) + (p1.w + 2)){ ball.vy = -ball.vy; points++; increaseSpd(); particlePos.x = ball.x, particlePos.y = ball.y; flag = 1; } } else if(ball.y <= p2.y + 2*p2.h) { if(ball.x >= p2.x && ball.x <= (p2.x - 2) + (p2.w + 2)){ ball.vy = -ball.vy; points++; increaseSpd(); particlePos.x = ball.x, particlePos.y = ball.y; flag = 1; } } //Collide with walls if(ball.x >= W || ball.x <= 0) ball.vx = -ball.vx; if(ball.y > H || ball.y < 0) { clearInterval(int); } if(flag == 1) { setInterval(emitParticles(particlePos.x, particlePos.y), 1000/fps); } } function emitParticles(x, y) { for(var k = 0; k < particlesCount; k++) { particles.push(new createParticles(x, y)); } counter = particles.length; for(var j = 0; j < particles.length; j++) { par = particles[j]; ctx.beginPath(); ctx.fillStyle = "white"; ctx.arc(par.x, par.y, par.radius, 0, Math.PI*2, false); ctx.fill(); par.x += par.vx; par.y += par.vy; par.radius -= 0.02; if(par.radius < 0) { counter--; if(counter < 0) particles = []; } } } var int = setInterval(draw, 1000/fps); Now, my function for emitting particles is on line 156, and I have called this function on line 151. The problem here can be because of I am not resetting the flag variable but I tried doing that and got more weird results. You can check that out here. By resetting the flag variable, the problem of infinite particles gets resolved but now they only animate and appear when the ball collides with the paddles. So, I am now out of any solution.

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• Silverlight Cream for February 09, 2011 -- #1044

  - by Dave Campbell

  In this Issue: Vikas, Tony Champion, Peter Kuhn, Ollie Riches, Rich Griffin, Rob Eisenberg, Andrea Boschin, Rudi Grobler(-2-), Jesse Liberty, Dan Wahlin, Roberto Sonnino, Deborah Kurata. Above the Fold: Silverlight: "Silverlight double click event" Vikas WP7: "Logging in Silverlight and WP7 with MVVM Light" Tony Champion XNA: "XNA for Silverlight developers: Part 3 - Animation (transforms)" Peter Kuhn Shoutouts: Vikas deserves congratulations for passing the beta Silverlight 4 exam, but in the process he has a great list of resources to help you do the same: Exam 70-506 ( TS: Silverlight 4, Development ) From SilverlightCream.com: Silverlight double click event Vikas demonstrates 3 ways to come up with a double-click in Silverlight: Timer, Rx Framework, and Behavior with code for each. Logging in Silverlight and WP7 with MVVM Light Tony Champion is discussing logging... and since he finds himself doing it in every project, he's setting up an extensible solution he can reuse and is doing so with MVVMLight XNA for Silverlight developers: Part 3 - Animation (transforms) Peter Kuhn has part 3 of his XNA for WP7 series up at SilverlightShow. In this 3rd tutorial, Peter is discussing animation with Transformations.... remember... this is XNA! WP7Contrib: Location Push Model Ollie Riches posts from the WP7C and discusses how they provide an interface for location service by abstracting away the GeoCoordinateWatcher class and provide a clean push model using the IObservable as the return types for all variants. WP7 Contrib – When messaging becomes messy and services shine Rich Griffin pulls another post up from WP7C where he discusses swapping out using Service Styles rather than Messenger Styles... in his words "when we start getting friction trying to bend the framework api to do something that it was not really meant for its time to use something [that] solves the problem better" Herding Code 104: Rob Eisenberg on Caliburn Micro Rob Eisenberg is interviewed on the latest Herding Code, talking about his baby, Caliburn Micro, and tons of other stuff as well... just check out the list of links generated for this show. Windows Phone 7 - Part #4: The application lifecycle Andrea Boschin has part 4 of his WP7 tutorial series up at SilverlightShow... In this tutorial he does a complete run-down the the WP7 Application Life-Cycle Simple Error Reporting on WP7 Rudi Grobler has a code snippet up that, with the end-user's permission of course, emails problem reports back to you... very cool idea. Simple Error Reporting on WP7 REDUX Rudi Grobler demonstrates using the Coding4Fun toolkit to display an exception prompt to the user... and then possibly email the report to you..see Rudi's other post on that. Creating An Application Bar–Don’t Panic In his latest (number 31) WP7 From Scratch episode, Jesse Liberty takes on the ApplicationBar, and uses Blend to get the job done easier. Syncing Data with a Server using Silverlight and HTTP Polling Duplex Dan Wahlin revisits some older posts of his about Push technologies in Silverlight, and provides some great insight (and code) into Http Polling Duplex Quick WPF/Silverlight tips to make great videos of your apps Roberto Sonnino has some great tips on making awesome videos of your WPF or Silverlight app. Simple Silverlight MVVM Base Class Deborah Kurata has her take at a good MVVM base class as the subject of her latest post... good points and good code. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Skype support and dead parrot sketches

  - by Greg Low

  We as an industry have a lot to answer for. One thing is the level of support provided for users. Here's the conversation I'm having with Skype right now. It feels like being in a Monty Python skit. I was really hoping that when Microsoft purchased Skype that things might improve. 8:33:44 PM greglowInitial Question/Comment: Subscriptions (Unlimited Country, Unlimited Europe, Unlimited Region, Unlimited World)8:33:44 PM SystemThank you for contacting Skype Customer Support!8:33:49 PM SystemDonna Faye has joined this session!8:33:50 PM SystemConnected with Donna Faye8:33:50 PM SystemThank you for contacting Skype Customer Support!8:33:54 PM SystemPlease hold for the next available Live Support Agent.8:33:59 PM Donna FayeHello! Welcome to Skype Live Support! My name is Donna L. How may I help you?8:34:09 PM greglowI've got a subscription (skypename greglow)8:34:21 PM greglowIt's set to auto-renew8:34:45 PM greglowWhy have I been getting messages about my Skype number expiring, if it's set to renew automatically8:34:54 PM greglowand has recently renewed automatically8:35:09 PM Donna FayeThank you for the information.8:35:29 PM Donna FayeTo better assist you may I know your Skype name, please?8:35:37 PM greglowgreglow8:35:44 PM Donna FayeThank you.8:36:14 PM Donna FayeI understand your concern that you receive an email notification stating that your calling subscription will about to expire. Am I right?8:36:43 PM greglowNo, I got an email telling me that one of my Skype numbers was going to expire8:37:08 PM greglowWhen I went to the website, it said it was part of the subscription and the subscription was set to auto-renew8:37:18 PM greglowThe subscription auto-renewed on Oct XXth8:37:24 PM greglowBut the number still expired8:37:43 PM greglowWhen I logged on today, it said that the number had expired and that I had 52 days left to reactivate it8:37:58 PM greglowI did that but am trying to understand why that happens at all8:38:36 PM greglowWhy do you expire numbers that are part of auto-renewing subscriptions?8:39:49 PM Donna FayeUpon checking your account, your calling subscription link to three Online Numbers.8:39:55 PM greglowcorrect8:40:10 PM greglowbut until an hour or so ago, one of them had expired. why?8:40:54 PM Donna FayeLet me explain to you that now Online Number are detach to a calling subscription unlike before it was attach to the calling subscription so therefore each Online Number will recur individually.8:41:29 PM Donna FayeUpon checking your account it shows that all your Online Number will expire on October XX, 20138:41:44 PM Donna FayeIf you don't want to be charged again for you can cancel it anytime.8:41:59 PM greglowI have set it to charge automatically8:42:06 PM greglowso why do the numbers expire?8:42:32 PM Donna FayeNo they are not expired they are all active.8:42:33 PM greglowif there is an automatic payment set up, why does anything expire?8:42:52 PM greglowyes, but one of them was expired, and I only fixed it a few hours ago8:43:07 PM greglowI'm trying to understand why it expired8:44:54 PM Donna FayeThe email you got just notify you that you should have good enough funding source of your calling subscription and Online Number in order for this to recur.8:45:12 PM greglowAgreed. I did that but the number still expired. Why?8:45:38 PM Donna FayeHowever do not worry on this hence all Online Number are active and not expired.8:45:41 PM greglowWhen I logged on today it said that the number had expired and that I had 52 days left to reactivate it. Why did that happen?8:46:14 PM Donna FayeMay I know the Online Number you are pertaining, please?The number that had expired was (07) XXXX XXXX (Australia)8:49:19 PM Donna FayeOkay, do not worry on this Online Number because this will expire on October XX, 2013.8:49:38 PM Donna FayeThank you for all the information.8:49:46 PM greglowI understand that it won't expire now until next year. I'm trying to understand why it stopped working this time8:49:51 PM greglowso I can avoid that next time8:50:39 PM Donna FayeWhat do yo stop working, you mean that Online Number is unable to be reach out?8:50:59 PM Donna Faye*what do you mean by stop working8:51:18 PM greglowThe Skype number +61 7 XXXX XXXX stopped working because it expired8:51:32 PM Donna FayeNo, this into expired.8:51:34 PM greglowI'm trying to understand why it expired8:51:50 PM greglowSorry I don't follow "this into expired"8:52:39 PM Donna FayeLet me inform you that this Online Number is not expired.8:52:54 PM Donna FayePlease disregard the notification you see on your Skype account.8:53:02 PM greglowSorry, this is getting very frustrating. I already told you I fixed it today. I want to know why it happened.8:53:20 PM Donna FayeHence I can rest assured you that this is active until October XX, 2013.8:53:21 PM greglowSo I can avoid it happening again, on this account, or on our other accounts8:53:34 PM greglowCan I speak to someone who really understands this please?Donna FayeSkype send a notification to Skype users for their Skype product in order for them to be aware the expiration of your product however your Online Number still active on your account hence when your calling subscription Unlimited World recur your Online Number also recur. 8:57:59 PM Donna Faye I do apologize for this matter, please allow me to resolve this issue for you. 9:02:48 PM greglow My question is still the same: if it's set to auto-pay, why did it expire? 9:03:50 PM greglow Why did it stop working? Why did I have to "reactivate" it? 9:04:08 PM greglow Why didn't it just keep working if it's set to auto-pay? 9:04:30 PM greglow This isn't a difficult concept 9:04:34 PM Donna Faye Let me clarify to you that this is not the really expired what is emphasizing on this is when you don't have good enough funding source when you calling subscription recur the Online Number will possibly expired but seem that you have a good funding source then this will continue until 2013. 9:05:10 PM greglow When I logged on today, it was not working, and your website said it had expired and that I had 52 days left to reactivate it 9:05:17 PM greglow Why?and so on, and so on, and so on.... 

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• Scripts Casing Flash Intro Animation To Stop [migrated]

  - by ubique

  When my Flash website loads, it freezes halfway through the initial animation for 2-3 seconds and then continues. This obviously doesn't look great and I can't figure out what is causing it. Am thinking it is one of the scripts in index.html causing the issue and have tried all sorts of ways to correct it - what have I done wrong? <!DOCTYPE html> <html lang="en"> <head> <title>company name</title> . . . <link href="style.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="js/flashobject.js"></script> <!--[if lt IE 7]> <link href="ie6.css" rel="stylesheet" type="text/css" /> <![endif]--> </head> <body> <header> <hgroup> <h1>company</h1> <h2>company</h2> </hgroup> </header> <div id="container"> <div id="head"> <div class="aligncenter"><a href="http://www.adobe.com/go/EN_US-H-GET-FLASH"> <img src="http://www.adobe.com/images/shared/download_buttons/get_adobe_flash_player.png" alt="" /></a> </div> </div> </div> <div class="g-plus" data-href="https://plus.google.com/100925740920754223119?rel=publisher" data-width="170" data-height="69" data-theme="light"> </body> <!-- Flash --> <script type="text/javascript"> var fo = new FlashObject("main_v10.swf", "head", "100%", "100%", "8", ""); fo.addParam("quality", "high"); fo.addParam("allowFullScreen", "true"); fo.write("head"); </script> <!-- Hello Bar --> <script type="text/javascript" src="//www.hellobar.com/hellobar.js"></script> <script type="text/javascript"> new HelloBar(39040,52484); </script> <!-- GPlus --> <script type="text/javascript"> window.___gcfg = {lang: 'en'}; (function() {var po = document.createElement("script"); po.type = "text/javascript"; po.async = true;po.src = "https://apis.google.com/js/plusone.js"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(po, s); })();</script> <!-- Google --> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-xxxxxxxx-1']); _gaq.push(['_setSiteSpeedSampleRate', 10]); _gaq.push(['_trackPageview']); (function init() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga,s); })(); window.onload = init; </script> </html>

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• How do you update live web sites with code changes?

  - by Aaron Anodide

  I know this is a very basic question. If someone could humor me and tell me how they would handle this, I'd be greatful. I decided to post this because I am about to install SynchToy to remedy the issue below, and I feel a bit unprofessional using a "Toy" but I can't think of a better way. Many times I find when I am in this situation, I am missing some painfully obvious way to do things - this comes from being the only developer in the company. ASP.NET web application developed on my computer at work Solution has 2 projects: Website (files) WebsiteLib (C#/dll) Using a Git repository Deployed on a GoGrid 2008R2 web server Deployment: Make code changes. Push to Git. Remote desktop to server. Pull from Git. Overwrite the live files by dragging/dropping with windows explorer. In Step 5 I delete all the files from the website root.. this can't be a good thing to do. That's why I am about to install SynchToy... UPDATE: THANKS for all the useful responses. I can't pick which one to mark answer - between using a web deployment - it looks like I have several useful suggesitons: Web Project = whole site packaged into a single DLL - downside for me I can't push simple updates - being a lone developer in a company of 50, this remains something that is simpler at times. Pulling straight from SCM into web root of site - i originally didn't do this out of fear that my SCM hidden directory might end up being exposed, but the answers here helped me get over that (although i still don't like having one more thing to worry about forgetting to make sure is still true over time) Using a web farm, and systematically deploying to nodes - this is the ideal solution for zero downtime, which is actually something I care about since the site is essentially a real time revenue source for my company - i might have a hard time convincing them to double the cost of the servers though. -- finally, the re-enforcement of the basic principal that there needs to be a single click deployment for the site OR ELSE THERE SOMETHING WRONG is probably the most useful thing I got out of the answers. UPDATE 2: I thought I come back to this and update with the actual solution that's been in place for many months now and is working perfectly (for my single web server solution). The process I use is: Make code changes Push to Git Remote desktop to server Pull from Git Run the following batch script: cd C:\Users\Administrator %systemroot%\system32\inetsrv\appcmd.exe stop site "/site.name:Default Web Site" robocopy Documents\code\da\1\work\Tree\LendingTreeWebSite1 c:\inetpub\wwwroot /E /XF connectionsconfig Web.config %systemroot%\system32\inetsrv\appcmd.exe start site "/site.name:Default Web Site" As you can see this brings the site down, uses robocopy to intelligently copy the files that have changed then brings the site back up. It typically runs in less than 2 seconds. Since peak traffic on this site is about 2 requests per second, missing 4 requests per site update is acceptable. Sine I've gotten more proficient with Git I've found that the first four steps above being a "manual process" is also acceptable, although I'm sure I could roll the whole thing into a single click if I wanted to. The documentation for AppCmd.exe is here. The documentation for Robocopy is here.

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• git pull gives error: 401 Authorization Required while accessing https://git.foo.com/bar.git

  - by spuder

  My macbook pro is able to clone/push/pull from the company git server. My cent 6.3 vm gets a 401 error git clone https://git.acme.com/git/torque-setup "error: The requested URL returned error: 401 Authorization Required while accessing https://git.acme.com/git/torque-setup/info/refs As a work around, I've tried creating a folder, with an empty repository, then setting the remote to the company server. I get the same error when trying a git pull The remotes are identical between the machines MacBook Pro (working) git --version git version 1.7.10.2 (Apple Git-33) git remote -v origin https://git.acme.com/git/torque-setup (fetch) origin https://git.acme.com/git/torque-setup (push) Cent 6.3 (not working) yum install -y git git --version git version 1.7.1 git remote -v origin https://git.acme.com/git/torque-setup (fetch) origin https://git.acme.com/git/torque-setup (push) The git server only allows https. Not git or ssh connections. Why is the macbook pro able to do a git pull, while the cent os machine can't? Solution Update 2013-5-15 As jku mentioned, the culprit is the old version of git installed on the cent box. Unfortunately, 1.7.1 is what you get when you run yum install git The work around is to manually install a newer version of git, or simply add the username to the repo git clone https://[email protected]/git/torque-setup

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• Heroku and Github integration (how to structure the project)

  - by Noah

  I'm creating a webservice and I want to store the source on github and run the app on heroku. I haven't seen my exact scenario addressed anywhere on the 'net so far, so I'll ask it here: I want to have the following directory structure: /project .git README <-- project readme file TODO.otl <-- project outline ... <-- other project-related stuff /my_rails_app app config ... README <-- rails' readme file In the above, project corresponds to http://github.com/myuser/project, and my_rails_app is the code that should be pushed to heroku. Do I need a separate branch for the rails app, or is there a simpler way that I'm missing? I guess my project-related non-rails files could live in my_rails_app, but the rails README already lives there and it seems inconsistent to overwrite that. However, if I leave it, my github page for the rails app will contain the rails readme, which makes no sense. Thanks, Noah P.S. I tried just setting it up as described above and running git push heroku from the main project folder. Of course, heroku doesn't know I want to deploy the subfolder: -----> Heroku receiving push ! Heroku push rejected, no Rails or Rack app detected.

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• JSON/PrototypeJS - why does this only work SOMETIMES?

  - by koko

  This is driving me nuts! I'm getting some JSON from my server: {"id262":{"done":null,"status":null,"verfall":null,"id":262,"bid":20044,"art":"owner","uid":"demo02","aktion":null,"termin_datum":null,"docid":null,"gruppenid":null,"news":"newsstring","datum":"11.06.2010","header":"headerstring","for_uid":"demo01"}, "id263":{"done":null,"status":"pending","verfall":null,"bid":20044,"id":263,"uid":"demo02","art":"foo","aktion":"dosomething","termin_datum":"11.06.2010","docid":null,"gruppenid":null,"datum":"11.06.2010","news":"newsstring","for_uid":"demo01","header":"headerstring"}, "id261":{"done":null,"status":null,"verfall":null,"id":261,"bid":20044,"art":"termin","uid":"demo02","aktion":null,"termin_datum":"25.06.2010","docid":null,"gruppenid":null,"news":"newsstring","datum":"11.06.2010","header":"headerstring","for_uid":null}} This is how my JS looks like: var user = 'demo02'; new Ajax.Request('myscript.pl?someparameter=value', { method:'get', onSuccess: function(transport){ var db_json = transport.responseText.evalJSON(), propCount = 0, someArray1 = [], someArray2 = [], otherArray = []; //JSON DEBUG console.log('validated string:'); console.log(transport.responseText.evalJSON(true)); for(var prop in db_json) { propCount++; if ( (db_json[prop].art == 'foo') && (db_json[prop].for_uid == user) ) { someArray1.push(db_json[prop]); } else if( (db_json[prop].art == 'foo') && (db_json[prop].uid == user) ) { someArray2.push(db_json[prop]); } else if( db_json[prop].art == 'log' ) { otherArray.push(db_json[prop]); } } if(someArray1.length>0) { someArray1.map(function(el){ $('someArray1target').innerHTML += el.done; //do more stuff }); } if(someArray2.length>0) { someArray2.map(function(el){ $('someArray2target').innerHTML += el.done; //do more stuff }); } }); Sometimes, it works perfectly. Sometimes, i get my JSON String (it appears in Firebug's "answer"-tab), but it won't log the JSON in console-log(). I'm not getting any errors and javascript is still working. Next time after reloading, it might work, but it might not. I cannot remotely imagine why this only happens sometimes!

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• Iphone application crashes when poping to rootController of UITabBar tab

  - by sniurkst

  Hello, I'm having this bug I can't figure out and it is making my head hurt. So, basically, in my iphone application I have UITabBar with some tabs each having UINavigationControllers inside. Something like this: someViewController *someController = [[someViewController alloc] myInit]; UINavigationController *someNav = [[UINavigationController alloc] initWithRootViewController:someController]; tab = [[UITabBarController alloc] init]; tab.viewControllers = [NSArray arrayWithObjects:otherNav, otherNav, evilNav, nil]; [window addSubview:tab.view]; So to reproduce my "precious" bug I go like this: click evilNav tab -> push tableListView (category list) -> push otherTableListView (category items list) -> push someOtherView (single item) -> popToRoot || popToController withindex:0 || click on evilNav tab again || pop to otherTableListView -> pop to tableListView -> crash (with no notable error) So if I go so far to someOtherView I can't go back to first tableListView (rootViewController) without application crashing. Meanwhile I can go to other tabs and then even click evilNav (when it is in otherTableListView or someOtherView state) without crashing. What could be causing this problem? (If you need I will post more code)

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• Getting snapshot from webcam in Matlab

  - by Harsh

  I have created a simple GUI to preview webcam stream and to get snapshot from it. For this I have created on axes to show video, one push button(pushbutton1) to start preview, one push button(pushbutton2) to get snapshot. Following is the code for these two push buttons. function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) axes(handles.axes1); vidObj = videoinput('winvideo',1); videoRes = get(vidObj, 'VideoResolution'); numberOfBands = get(vidObj, 'NumberOfBands'); handleToImage = image( zeros([videoRes(2), videoRes(1), numberOfBands], 'uint8') ); preview(vidObj, handleToImage); % --- Executes on button press in pushbutton2. function pushbutton2_Callback(hObject, eventdata, handles) % hObject handle to pushbutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) a=getsnapshot(get(axes,'Children')); imshow(a); In pushbutton2_Callback I am trying to get child of axes ie. vidObj. But this gives me error ??? Undefined function or method 'getsnapshot' for input arguments of type 'double'.. Why is it returing double type instead of child object vidObj? How can I fix it and get snapshot? Is there any other better way? (I just started learning GUI.) Thanks.

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• UINavigationBar is getting buttons from another view

  - by Rafael Oliveira

  I have three Views, Splash, Login and List. From Splash I just wait and then Push Login View, with the Navigation Bar hidden. In Login I Show the NavigationBar, hide the BackButton1 and add a new RightButton1, then I check if Settings.bundle "login" and "pass" are set. If so, I push List View. Otherwise I stay in the Login view waiting for the user to fill the form and press a button. In List View I add a new RightButton2 and a new BackButton2. The problem is that if Settings.bundle data is not null, and in Login View I quickly push List View the RightButton1 appears in List View, or no buttons appear at all, or only BackButton2 doesn't appear... The most strange thing of all is that everything was OK and all of sudden it started to get messy. Login View: // Making the Navigation Bar Visible [self.navigationController setNavigationBarHidden:NO animated:NO]; // Hiding the Back Button in THIS view (Login) [self.navigationItem setHidesBackButton:YES]; // Inserting the Logout Button for the Next View (List) UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Logout" style:UIBarButtonItemStylePlain target:nil action:nil]; self.navigationItem.backBarButtonItem = backButton; [backButton release]; UIBarButtonItem* newAccountButton = [[UIBarButtonItem alloc] initWithTitle:@"New Account" style:UIBarButtonItemStylePlain target:self action:@selector(newAccountButtonPressed)]; self.navigationItem.rightBarButtonItem = newAccountButton; [newAccountButton release]; List View // Making the Navigation Bar Visible [self.navigationController setNavigationBarHidden:NO animated:NO]; UIBarButtonItem* aboutButton = [[UIBarButtonItem alloc] initWithTitle:@"About" style:UIBarButtonItemStylePlain target:self action:@selector(aboutButtonPressed)]; self.navigationItem.rightBarButtonItem = aboutButton; [aboutButton release]; Any ideas ?

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• Powershell / .Net: Get a reference to an object returned by a method

  - by Dan Menes

  I am teaching myself PowerShell by writing a simple parser. I use the .Net framework class Collections.Stack. I want to modify the object at the top of the stack in place. I know I can pop() the object off, modify it, and then push() it back on, but that strikes me as inelegant. First, I tried this: $stk = new-object Collections.Stack $stk.push( (,'My first value') ) ( $stk.peek() ) += ,'| My second value' Which threw an error: Assignment failed because [System.Collections.Stack] doesn't contain a settable property 'peek()'. At C:\Development\StackOverflow\PowerShell-Stacks\test.ps1:3 char:12 + ( $stk.peek <<<< () ) += ,'| My second value' + CategoryInfo : InvalidOperation: (peek:String) [], RuntimeException + FullyQualifiedErrorId : ParameterizedPropertyAssignmentFailed Next I tried this: $ary = $stk.peek() $ary += ,'| My second value' write-host "Array is: $ary" write-host "Stack top is: $($stk.peek())" Which prevented the error but still didn't do the right thing: Array is: My first value | My second value Stack top is: My first value Clearly, what is getting assigned to $ary is a copy of the object at the top of the stack, so when I the object in $ary, the object at the top of the stack remains unchanged. Finally, I read up on teh [ref] type, and tried this: $ary_ref = [ref]$stk.peek() $ary_ref.value += ,'| My second value' write-host "Referenced array is: $($ary_ref.value)" write-host "Stack top is still: $($stk.peek())" But still no dice: Referenced array is: My first value | My second value Stack top is still: My first value I assume the peek() method returns a reference to the actual object, not the clone. If so, then the reference appears to be being replaced by a clone by PowerShell's expression processing logic. Can somebody tell me if there is a way to do what I want to do? Or do I have to revert to pop() / modify / push()?

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• Read a buffer of unknown size (Console input)

  - by Sanarothe

  Hi. I'm a little behind in my X86 Asm class, and the book is making me want to shoot myself in the face. The examples in the book are insufficient and, honestly, very frustrating because of their massive dependencies upon the author's link library, which I hate. I wanted to learn ASM, not how to call his freaking library, which calls more of his library. Anyway, I'm stuck on a lab that requires console input and output. So far, I've got this for my input: input PROC INVOKE ReadConsole, inputHandle, ADDR buffer, Buf - 2, ADDR bytesRead, 0 mov eax,OFFSET buffer Ret input EndP I need to use the input and output procedures multiple times, so I'm trying to make it abstract. I'm just not sure how to use the data that is set to eax here. My initial idea was to take that string array and manually crawl through it by adding 8 to the offset for each possible digit (Input is integer, and there's a little bit of processing) but this doesn't work out because I don't know how big the input actually is. So, how would you swap the string array into an integer that could be used? Full code: (Haven't done the integer logic or the instruction string output because I'm stuck here.) include c:/irvine/irvine32.inc .data inputHandle HANDLE ? outputHandle HANDLE ? buffer BYTE BufSize DUP(?),0,0 bytesRead DWORD ? str1 BYTE "Enter an integer:",0Dh, 0Ah str2 BYTE "Enter another integer:",0Dh, 0Ah str3 BYTE "The higher of the two integers is: " int1 WORD ? int2 WORD ? int3 WORD ? Buf = 80 .code main PROC call handle push str1 call output call input push str2 call output call input push str3 call output call input main EndP larger PROC Ret larger EndP output PROC INVOKE WriteConsole Ret output EndP handle PROC USES eax INVOKE GetStdHandle, STD_INPUT_HANDLE mov inputHandle,eax INVOKE GetStdHandle, STD_INPUT_HANDLE mov outputHandle,eax Ret handle EndP input PROC INVOKE ReadConsole, inputHandle, ADDR buffer, Buf - 2, ADDR bytesRead, 0 mov eax,OFFSET buffer Ret input EndP END main

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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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