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• Suggestions on how to track tag count for a particular object

  - by Robin Fisher

  Hi, I'm looking for suggestions on how to track the number of tags associated with a particular object in Rails. I'm using acts_as_taggable_on and it's working fine. What I would like to be able to do is search for all objects that have no tags, preferably through a scope i.e. Object.untagged.all My first thought was to use an after_save callback to update an attribute called "taggings_count" in my model: def update_taggings_count self.taggings_count = self.tag_list.size self.save end Unfortunately, this does the obvious thing of putting me in an infinite loop. I need to use an after_save callback because the tag_list is not updated until the main object is saved. Would appreciate any suggestions as I'm on the verge of rolling my own tagging system. Regards Robin

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• Force redraw before long running operations

  - by Joshua

  When you have a button, and do something like: Private Function Button_OnClick Button.Enabled = False [LONG OPERATION] End Function Then the button will not be grayed, because the long operation prevents the UI thread from repainting the control. I know the right design is to start a background thread / dispatcher, but sometimes that's too much hassle for a simple operation. So how do I force the button to redraw in disabled state? I tried .UpdateLayout() on the Button, but it didn't have any effects. I also tried System.Windows.Forms.DoEvents() which normally works when using WinForms, but it also had no effect.

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• how to callback a lua function from a c function

  - by pierr

  Hi, I have a c function test_callback accepting a point to a function as the parameter and It will "callback" that function. //typedef int(*data_callback_t)(int i); int test_callback(data_callback_t f) { f(3); } int datacallback(int a ) { printf("called back %d\n",a); return 0; } //example test_callback(datacallback); // print : called back 3 Now, I want to wrap test_callback so that they can be called from lua, suppose the name is lua_test_callback ;and also the input parameter to it would be a lua function. How should I achieve this goal? function lua_datacallback (a ) print "hey , this is callback in lua" ..a end lua_test_callback(lua_datacallback) //expect to get "hey this is callback in lua 3 "

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• Remove polyline

  - by Fran Rod

  I have the next code which show a path using a polyline. How can I remove it? downloadUrl("myfile.asp", function(data) { var xml = xmlParse(data); var markers = xml.documentElement.getElementsByTagName("marker"); var path = []; for (var i = 0; i < markers.length; i++) { var lat = parseFloat(markers[i].getAttribute("lat")); var lng = parseFloat(markers[i].getAttribute("lng")); var point = new google.maps.LatLng(lat,lng); path.push(point); }//finish loop var polyline = new google.maps.Polyline({ path: path, strokeColor: "#FF0000", strokeOpacity: 1.0, strokeWeight: 2 }); polyline.setMap(map); }); //end download url I have tried it using the next function but I m not able to make it work. function removePath() { polyline.setMap(null) }

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• How to change source order of <div> in less steps/automatically?

  - by metal-gear-solid

  How can i do this task automate. i need to change source order of div, which has same id in above 100 pages. i created example This is default condition <div class="identification"> <div class="number">Number 1</div> </div> <div class="identification"> <div class="number">Number 2</div> </div> <div class="identification"> <div class="number">Number 3</div> </div> <div class="identification"> <div class="number">Number 4</div> </div> <div class="identification"> <div class="number">Number 5</div> </div> <div class="identification"> <div class="number">Number 6</div> </div> I need lik this <div class="identification"> <div class="number">Number 1</div> </div> <div class="identification"> <div class="number">Number 3</div> </div> <div class="identification"> <div class="number">Number 2</div> </div> <div class="identification"> <div class="number">Number 6</div> </div> <div class="identification"> <div class="number">Number 4</div> </div> <div class="identification"> <div class="number">Number 5</div> </div> Is the manual editing only option? I use dreamweaver.

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• Shell script for testing

  - by Helltone

  I want a simple testing shell script that launches a program N times in parallel, and saves each different output to a different file. I have made a start that launches the program in parallel and saves the output, but how can I keep only the outputs that are different? Also how can I actually make the echo DONE! indicate the end? #!/bin/bash N=10 for((i=1; j<=$N; ++i)); do ./test > output-$N & done echo DONE!

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• Keep local MS SQL 2008 DB table and remote SQL Azure DB table in sync

  - by Boomerangertanger

  Hi there, I have a dedicated server which hosts a Windows Service which does a lot of very heavy load stuff and populates a number of SQL Server database tables. However, of all the database tables it populates and works with, I want only one to be synchronised with a remote SQL Azure DB table. This is because this table holds what I called Resolved data, which is the end result of the Windows Service's work. I would like to keep a SQL Azure database table in sync with this database table. As far as I understand, my options are: Move everything onto Azure (but that involves a massive development overhead and risk) Have another Windows Service on the dedicated server which essentially looks at changed records since the last update and then manually update the SQL Azure table

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• Remove items from SWT tables

  - by Dima

  This is more of an answer I'd like to share for the problem I was chasing for some time in RCP application using large SWT tables. The problem is the performance of SWT Table.remove(int start, int end) method. It gives really bad performance - about 50msec per 100 items on my Windows XP. But the real show stopper was on Vista and Windows 7, where deleting 100 items would take up to 5 seconds! Looking into the source code of the Table shows that there are huge amount of windowing events flying around in this call.. That brings the windowing system to its knees. The solution was to hide the damn thing during this call: table.setVisible(false); table.remove(from, to); table.setVisible(true); That does wonders - deleting 500 items on both XP & Windows7 takes ~15msec, which is just an overhead for printing out time stamps I used. nice :)

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• How to resize an openGL window created with wglCreateContext?

  - by Nick

  Is it possible to resize an openGL window (or device context) created with wglCreateContext without disabling it? If so how? Right now I have a function which resizes the DC but the only way I could get it to work was to call DisableOpenGL and then re-enable. This causes any textures and other state changes to be lost. I would like to do this without the disable so that I do not have to go through the tedious task of recreating the openGL DC state. HWND hWnd; HDC hDC; void View_setSizeWin32(int width, int height) { // resize the window LPRECT rec = malloc(sizeof(RECT)); GetWindowRect(hWnd, rec); SetWindowPos( hWnd, HWND_TOP, rec->left, rec->top, rec->left+width, rec->left+height, SWP_NOMOVE ); free(rec); // sad panda DisableOpenGL( hWnd, hDC, hRC ); EnableOpenGL( hWnd, &hDC, &hRC ); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-(width/2), width/2, -(height/2), height/2, -1.0, 1.0); // have fun recreating the openGL state.... } void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC) { PIXELFORMATDESCRIPTOR pfd; int format; // get the device context (DC) *hDC = GetDC( hWnd ); // set the pixel format for the DC ZeroMemory( &pfd, sizeof( pfd ) ); pfd.nSize = sizeof( pfd ); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 24; pfd.cDepthBits = 16; pfd.iLayerType = PFD_MAIN_PLANE; format = ChoosePixelFormat( *hDC, &pfd ); SetPixelFormat( *hDC, format, &pfd ); // create and enable the render context (RC) *hRC = wglCreateContext( *hDC ); wglMakeCurrent( *hDC, *hRC ); } void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC) { wglMakeCurrent( NULL, NULL ); wglDeleteContext( hRC ); ReleaseDC( hWnd, hDC ); }

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• Invalid function declaration. DevC++

  - by user69514

  Why do I get invalid function declaration when I compile the code in DevC++ in Windows, but when I compile it in CodeBlocks on Linux it works fine. #include <iostream> #include <vector> using namespace std; //structure to hold item information struct item{ string name; double price; }; //define sandwich, chips, and drink struct item sandwich{"Sandwich", 3.00}; **** error is here ***** struct item chips{"Chips", 1.50}; **** error is here ***** struct item drink{"Large Drink", 2.00}; **** error is here ***** vector<item> cart; //vector to hold the items double total = 0.0; //total const double tax = 0.0825; //tax //gets item choice from user char getChoice(){ cout << "Select an item:" << endl; cout << "S: Sandwich. $3.00" << endl; cout << "C: Chips. $1.50" << endl; cout << "D: Drink. $2.00" << endl; cout << "X: Cancel. Start over" << endl; cout << "T: Total" << endl; char choice; cin >> choice; return choice; } //displays current items in cart and total void displayCart(){ cout << "\nCart:" << endl; for(unsigned int i=0; i<cart.size(); i++){ cout << cart.at(i).name << ". $" << cart.at(i).price << endl; } cout << "Total: $" << total << endl << endl; } //adds item to the cart void addItem(struct item bought){ cart.push_back(bought); total += bought.price; displayCart(); } //displays the receipt, items, prices, subtotal, taxes, and total void displayReceipt(){ cout << "\nReceipt:" << endl; cout << "Items: " << cart.size() << endl; for(unsigned int i=0; i<cart.size(); i++){ cout << (i+1) << ". " << cart.at(i).name << ". $" << cart.at(i).price << endl; } cout << "----------------------------" << endl; cout << "Subtotal: $" << total << endl; double taxes = total*tax; cout << "Tax: $" << taxes << endl; cout << "Total: $" << (total + taxes) << endl; } int main(){ //sentinel to stop the loop bool stop = false; char choice; while (stop == false ){ choice = getChoice(); //add sandwich if( choice == 's' || choice == 'S' ){ addItem(sandwich); } //add chips else if( choice == 'c' || choice == 'C' ){ addItem(chips); } //add drink else if( choice == 'd' || choice == 'D' ){ addItem(drink); } //remove everything from cart else if( choice == 'x' || choice == 'X' ){ cart.clear(); total = 0.0; cout << "\n***** Transcation Canceled *****\n" << endl; } //calcualte total else if( choice == 't' || choice == 'T' ){ displayReceipt(); stop = true; } //or wront item picked else{ cout << choice << " is not a valid choice. Try again\n" << endl; } }//end while loop return 0; //end of program }

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• Incorrect error

  - by jspooner

  If you assign an invalid date (like December 39th) to a datetime column ActiveRecord returns a "can't be blank" error when is should probably return an error like "Not a valid date" My question. Is this expected rails behavior, a bug or, something that I could patch? class ExerciseLog < ActiveRecord::Base validates_presence_of :scheduled_datetime end Fire up the console. e = Log.new # lets set a date for Dec 39th which obviously doesn't exist e.scheduled_datetime = "2010-12-39" e.save => false # this is the confusing message since our form did post a valid date e.errors.on(:scheduled_datetime) => "can't be blank" e.scheduled_datetime = "2010-12-30" e.save => true I discovered this issue when I accidentally transposed the month and day values. btw This is in Rails 2.3.5

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• How to determine the timezone that an email was sent from in C#

  - by John Sibly

  Can anyone recommend a way to determine the timezone that an email was sent from in C#? Looking at the header information of an email includes information like: Received: from mail-ew0-f211.google.com (123.85.219.211) by UKExchange (10.1.10.99) with Microsoft SMTP Server id 1.2.345.6; Tue, 13 Apr 2010 14:26:24 +0100 Received: by ewy3 with SMTP id 3so288857ewy.6 for <[email protected]>; Tue, 13 Apr 2010 06:26:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.103.213.2 with HTTP; Tue, 13 Apr 2010 06:26:23 -0700 (PDT) X-Originating-IP: [83.244.243.210] Date: Tue, 13 Apr 2010 14:26:23 +0100 Received: by 10.103.3.17 with SMTP id f17mr3087878mui.123.1271165183473; Tue, 13 Apr 2010 06:26:23 -0700 (PDT) There are a number of "Received: from" and "Received: by" keys with a date, time and timezone indicated on the end. Which one of these should I attempt to parse? Is this a reliable way to figure out the sender's timezone, or anyone recommend a better way?

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• What do you do before starting on a project?

  - by hahuang65

  I'm still a pretty new project, and I haven't really worked on any large projects yet. However a few projects for school has shown me something I have never really thought of before. Pre-Project planning. One project we ran into a huge problem at the very last minute, and the other project was not divided up between partners very evenly, such that all the work was actually done at the end. So my question to everyone here is: How do you plan out the project beforehand? Please try to cover the following: Design (draw out UI by hand, UMLs, etc.) Division of Labor Timeline (especially how you estimate how much time is needed for certain things) and anything else you can think of. Thanks for all the help!

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• Sending file over socket

  - by johannix

  I'm have a problem sending data as a file from one end of a socket to the other. What's happening is that both the server and client are trying to read the file so the file never gets sent. I was wondering how to have the client block until the server's completed reading the file sent from the client. I have this working with raw packets using send and recv, but figured this was a cleaner solution... Client: connects to server creating socket connection creates a file on socket and sends data waits for file from server Server: waits for file from client Complete interraction: client sends data to server server sends data to client

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• JQuery:FullCalendar Plugin: Events are not shown in week view and day view but are shown in month vi

  - by bocode

  I've the following code to fetch events: $('#calendar').fullCalendar({ theme: true, slotMinutes: 10, header: { left: 'prev,next today', center: 'title', right: 'month,agendaWeek,agendaDay', }, defaultView: 'agendaDay', allDaySlot: false, editable: false, events: "/cgi-bin/shlk/getshlkruns.pl" }); The output from getshlkruns.pl is fairly simple json feed: [{'title': 'Successful','start': 1266398223,'end': 1266398266,'url': '/shlk/cgi-bin/getshlkrunlog.pl?i=21'}] There are several events like above (i've removed for brevity sake). So the above events show up when am in the month view but mysteriously absent when am in week or day view. What am doing wrong here? Thanks in advance for your answers.

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• If you were developing shareware softwares for windows, would you target the .Net Framework or use n

  - by bohoo

  For the sake of the question, by 'shareware' I mean a software which is relatively small in size (up to few dozens of mb) and available for download and evaluation through a web site. I'm asking this question, because I don't understand something regarding the current state of windows commercial desktop development. It seems to me that: There is no reliable statistic regarding the extent of windows systems with .Net Framework installed. It makes no sense to force the end user to install the 20-60mb .Net for an application which may be smaller. Applications conforms to the term 'shareware' above have a big share on the win os market. Much of them don't need the capabilities of low level languages like c++, and therefore ideally they should be developed with a RAD enviroment. So, One would suppose there will be a blossom of RAD enviroments for native win code. But I know about only one - Delphi, and Delphi is so unpopular. How is that?

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• page.replace_html for entire div not partial?

  - by odpogn

  My sites navigation is within my <%= render 'layouts/header' %. I want to use ajax so that when a user clicks on a navigation link, only the refreshes. is not a partial, is there a way to refresh the content of that div without using a partial? <div id="container"> <%= render 'layouts/header' %> <div id="content"> <% flash.each do |key, value| %> <div class="flash <%= key %>"><%= value %></div> <% end %> <%= yield %> </div> </div>

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• Get only latest row, grouped by a column

  - by Cylindric

  I have a large data-set of emails sent and status-codes. ID Recipient Date Status 1 [email protected] 01/01/2010 1 2 [email protected] 02/01/2010 1 3 [email protected] 01/01/2010 1 4 [email protected] 02/01/2010 2 5 [email protected] 03/01/2010 1 6 [email protected] 01/01/2010 1 7 [email protected] 02/01/2010 2 In this example: all emails sent to someone have a status of 1 the middle email (by date) sent to them has a status of 2, but the latest is 1 the last email sent to others has a status of 2 What I need to retrieve is a count of all emails sent to each person, and what the latest status code was. The first part is fairly simple: SELECT Recipient, Count(*) EmailCount FROM Messages GROUP BY Recipient ORDER BY Recipient Which gives me: Recipient EmailCount [email protected] 2 [email protected] 3 [email protected] 2 How can I get the most recent status code too? The end result should be: Recipient EmailCount LastStatus [email protected] 2 1 [email protected] 3 1 [email protected] 2 2 Thanks. (Server is Microsoft SQL Server 2008, query is being run through an OleDbConnection in .Net)

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• Run Oracle Procedure just to lock row, without returning a resultset

  - by Pascal

  I want to run a procedure to force a row lock on a row, but I don't want to return a result set to the client, nor do I actually want to update anything. Below is the proc: CREATE OR REPLACE PROCEDURE SP_LOCK_Row (IDRow IN INTEGER) IS BEGIN SELECT * FROM TBLTable WHERE IDRow = IDRow FOR UPDATE; END; The problem is that I keep getting the error: PLS-00428: an INTO clause is expected in this SELECT statement. Is there a way for me to lock the row without actually having to return a result set back to the client? The SQL Server equivalent is: CREATE PROCEDURE dbo.SP_LOCK_Row( @IDRow INT) AS SELECT * FROM dbo.TBLTable WITH (UPDLOCK, ROWLOCK) WHERE IDRow = @IDRow Tks

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• How to use backreferences in PHP

  - by Slinky

  I want to add a character to the end of each file extension found in a body of text using preg_replace(). Here is some sample text: $string='http://www.mysite.com/expert/images/imageone.jpghttp://www.mysite.com/expert/images/imagetwo.jpg'; This search & replace works fine in TextWrangler, appending a semi colon to file extensions: (\.(jpg|gif|html?|php|tiff?|pdf|png)) \1; Translated to PHP, however does not work, having no effect; no errors. preg_replace("/(\.(jpg|gif|html|php|tif|tiff|pdf|htm|png))/","\\1;",$string);

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• Is there a chance that sending an email via a thread could ever fail to complete?

  - by Benjamin Dell

  I have a project where I send a couple of emails via a seperet thread, to speed up the process for the end-user. It works successfully, but i was just wondering whether there were any potfalls that i might not have considered? My greatest fear is that the user clicks a button, it says that the message has been sent (as it will have been sent to the thread for sending) but for some reason the thread might fail to send it. Are there any situations where a thread could be aborted prematurely? Please note, that i am not talking about network outages or obvious issues with an email recipient not existing. For simplicites sake please assume that the connect is up, the mail server alive and the recipient valid. Is it possible, for example, for the thread to abort prematurely if the user kills the browser before the thread has completed? This might be a silly question, but i just wanted to make sure i knew the full ramifications of using a thread in this manner. Thanks, in advance, for your help.

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• Rails - Trying to query from a date range...everything from today

  - by ChrisWesAllen

  I'm trying to figure the best way to query a date range from rails...I looked around on Google but am unsure about how to use this syntax. I have a Model that has various events and I like to add to my find condition a caveat that should only show events where the field :st_date is today or later, in effect only show me data that is current, nothing that happened before today. I ran into a problem because I have no end date to stop the query, I want to query everything from today to next month. I was thinking something like @events = Event.find(:all, :conditions => ["start_date between ? and ?", date.Today, date.next_month.beginning_of_month]) but I get the error undefined local variable or method `date'...... Do I need do anything particular to use the Date class? Or is there something wrong with my query syntax? I would really appreciate any help.

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• Ruby: rules for implicit hashes

  - by flyer

  Why second output shows me only one element of Array? Is it still Array or Hash already? def printArray(arr) arr.each { | j | k, v = j.first printf("%s %s %s \n", k, v, j) } end print "Array 1\n" printArray( [ {kk: { 'k1' => 'v1' }}, {kk: { 'k2' => 'v2' }}, {kk: { 'k3' => 'v3' }}, ]) print "Array 2\n" printArray( [ kk: { 'k1' => 'v1' }, kk: { 'k2' => 'v2' }, kk: { 'k3' => 'v3' }, ]) exit # Output: # # Array 1 # kk {"k1"=>"v1"} {:kk=>{"k1"=>"v1"}} # kk {"k2"=>"v2"} {:kk=>{"k2"=>"v2"}} # kk {"k3"=>"v3"} {:kk=>{"k3"=>"v3"}} # Array 2 # kk {"k3"=>"v3"} {:kk=>{"k3"=>"v3"}}

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• Last Observation Carried Forward In a data frame?

  - by Tal Galili

  Hi all, I wish to implement a "Last Observation Carried Forward" for a data set I am working on which has missing values at the end of it. Here is a simple code to do it (question after it): LOCF <- function(x) { # Last Observation Carried Forward (for a left to right series) LOCF <- max(which(!is.na(x))) # the location of the Last Observation to Carry Forward x[LOCF:length(x)] <- x[LOCF] return(x) } # example: LOCF(c(1,2,3,4,NA,NA)) LOCF(c(1,NA,3,4,NA,NA)) Now this works great for simple vectors. But if I where to try and use it on a data frame: a <- data.frame(rep("a",4), 1:4,1:4, c(1,NA,NA,NA)) a t(apply(a, 1, LOCF)) # will make a mess It will turn my data frame into a character matrix. Can you think of a way to do LOCF on a data.frame, without turning it into a matrix? (I could use loops and such to correct the mess, but would love for a more elegant solution) Cheers, Tal

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• PHP search multidimensional array for value, then place that element at start of array

  - by BobFlemming

  I need to search this array: cars - [0] -make : Ford -model: Escort -year: 1991 [1] -make: Honda -model: Civic -year: 1996 [2] -make: Vauxhall -model: Astra -year: 1972 And if (for example) the model is "Civic" , place that 'car' at position 0. So the end array would be like: cars - [0] -make: Honda -model: Civic -year: 1996 [1] -make : Ford -model: Escort -year: 1991 [2] -make: Vauxhall -model: Astra -year: 1972 I've tried some usort variations: function typeSort($a, $b) { if ($a['model'] == 'Civic' ) { return 0; } return ($a['model'] < $b['model']) ? -1 : 1; } but this is just returning 1

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