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  • Protecting from crashes (beyond bounds) with [object objectAtIndex:]

    - by Tom
    Hi! I'd like to know if there's a way to verify if an index exists before getting it. So it'd be way to protect my code against: *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index (2) beyond bounds (0)' Like in PHP you can do: isset($object[10]); and it'll return true if it exists. Is there such a method in Objective-C/Cocoa? Thanks!

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  • something about C++ unnamed namespace.

    - by Javran
    #include <iostream> namespace { int a=1; } int a=2,b=3; int main(void) { std::cout<<::a<<::b; return 0; } I complie it with my g++,but the output is 23, who can explain it? is that a way to get access to the <unnamed> namespace ::a?

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  • Rails: attribute_changed?

    - by Sam
    I have a model that has an amount and I'm tracking to see if this amount is changed with a Model.amount_changed? with a before_save which works fine but when I check to see amount_was and amount_change? it only returns the updated amount not the previous amount. And all this is happening before it is save. It knows when the attribute is changed but it will not return the old value. Ideas?

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  • problem in DataTextFied

    - by ZiGi
    i know that the syntax for usin DataTextField is : VA.DataTextField = "nameofcolum" but if my request is not simple that mean my request return the result in a colum wich not exist in this case what i should to affect to DataTextField

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  • saveOrUpdate(Object) method of Hibernate

    - by Vikram
    when i use saveOrUpdate(Object) method of Hibernate. How can I know that row is updated or new row added into table??? Return type of method saveOrUpdate(Object) is void, so am not able to find out the result after calling this method. kindly help me.

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  • jquery add either of two fields to form

    - by user2891182
    I have worked out how to add a field to a form through JQuery but cannot figure out how to have two add field buttons so I can add one or the other fields? Could someone lead me in the right direction? <html> <head> <title>jQuery add / remove textbox example</title> <script type="text/javascript" src="jquery-1.3.2.min.js"></script> <style type="text/css"> div{ padding:8px; } </style> </head> <body> <h1>jQuery add / remove textbox example</h1> <script type="text/javascript"> $(document).ready(function(){ var counter = 2; $("#addButton").click(function () { if(counter>10){ alert("Only 10 textboxes allow"); return false; } var newTextBoxDiv = $(document.createElement('div')) .attr("id", 'TextBoxDiv' + counter); newTextBoxDiv.after().html('<label>Textbox #'+ counter + ' : </label>' + '<input type="text" name="textbox' + counter + '" id="textbox' + counter + '" value="" >'); newTextBoxDiv.appendTo("#TextBoxesGroup"); counter++; }); $("#removeButton").click(function () { if(counter==1){ alert("No more textbox to remove"); return false; } counter--; $("#TextBoxDiv" + counter).remove(); }); $("#getButtonValue").click(function () { var msg = ''; for(i=1; i<counter; i++){ msg += "\n Textbox #" + i + " : " + $('#textbox' + i).val(); } alert(msg); }); }); </script> </head><body> <div id='TextBoxesGroup'> <div id="TextBoxDiv1"> <label>Textbox #1 : </label><input type='textbox' id='textbox1' > </div> </div> --I am trying to have a use click on either of these two buttons and have the appropriate field added next.-- <input type='button' value='Add field #01' id='addButton'> <input type='button' value='Add field #02' id='addButton'> <input type='button' value='Remove Last Field' id='removeButton'> </body> </html>

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  • C++ require that one template type is derived from the other

    - by Will
    In a comparison operator: template<class R1, class R2> bool operator==(Manager<R1> m1, Manager<R2> m2) { return p1.internal_field == p2.internal_field; } Is there any way I could enforce that R1 and R2 must have a supertype or subtype relation? That is, I'd like to allow either R1 to be derived from R2, or R2 to be derived from R1, but disallow the comparison if R1 and R2 are unrelated types.

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  • Obtaining standard port for arbitrary protocols in PHP

    - by Trott
    I'm looking for a function that will accept a string representing the scheme portion of a URL (e.g., "http", "https", "ftp", etc.) and return the standard port. It might be used like this: echo get_port_from_protocol("http"); // 80 As a last resort, I suppose I could write something to parse through /etc/services (assuming I only need to run under UNIX-like operating systems). But surely there must be something built-in to PHP, no?

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  • mysql_query() returns returns true, but mysql_num_rows() and mysql_fetch_array() give "not a valid r

    - by zlance4012
    Here is the code in question: -----From index.php----- require_once('includes/DbConnector.php'); // Create an object (instance) of the DbConnector $connector = new DbConnector(); // Execute the query to retrieve articles $query1 = "SELECT id, title FROM articles ORDER BY id DESC LIMIT 0,5"; $result = $connector-query($query1); echo "vardump1:"; var_dump($result); echo "\n"; /(!line 17!)/ echo "Number of rows in the result of the query:".mysql_num_rows($result)."\n"; // Get an array containing the results. // Loop for each item in that array while ($row = $connector-fetchArray($result)){ echo ' '; echo $row['title']; echo ' '; -----end index.php----- -----included DbConnector.php----- $settings = SystemComponent::getSettings(); // Get the main settings from the array we just loaded $host = $settings['dbhost']; $db = $settings['dbname']; $user = $settings['dbusername']; $pass = $settings['dbpassword']; // Connect to the database $this-link = mysql_connect($host, $user, $pass); mysql_select_db($db); register_shutdown_function(array(&$this, 'close')); } //end constructor //* Function: query, Purpose: Execute a database query * function query($query) { echo "Query Statement: ".$query."\n"; $this-theQuery = $query; return mysql_query($query, $this-link) or die(mysql_error()); } //* Function: fetchArray, Purpose: Get array of query results * function fetchArray($result) { echo "<|"; var_dump($result); echo "| \n"; /(!line 50!)/$res= mysql_fetch_array($result) or die(mysql_error()); echo $res['id']."-".$res['title']."-".$res['imagelink']."-".$res['text']; return $res; } -----end DbConnector.php----- -----Output----- Query Statement: SELECT id, title FROM articles ORDER BY id DESC LIMIT 0,5 vardump1:bool(true) PHP Error Message Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /path to/index.php on line 17 Number of rows in the result of the query: <|bool(true) | PHP Error Message Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /path to/DbConnector.php on line 50

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  • Rails 2.3 using another model's named_scope or alternative

    - by mustafi
    Hi Let's say I have two models like so: class Comment < ActiveRecord::Base belongs_to :user named_scope :about_x :conditions => "comments.text like '%x%')" end class User < ActiveRecord::Base has_many :comments end I would like to use the models so that I can return all the users and all comments with text like '%x%' all_user_comments_about_x = User.comments.about_x How to proceed? Thank you

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  • Javascript Date: Ensure getMinutes(), getHours(), getSeconds() puts 0 in front if necessary

    - by Mega Matt
    Hi all, Looking for a creative way to be sure values that come from the getHours, getMinutes, and getSeconds() method for the javascript Date object return "06" instead of 6 (for example). Are there any parameters that I don't know about? Obviously I could write a function that does it by checking the length and prepending a "0" if need be, but I thought there might be something more streamlined than that. Thanks.

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  • having an issue about the output in c programming ..

    - by user2985811
    i'm having a problem on running the output after putting the input.. the output doesn't show after i put the variables and i don't know how to set the code .. so if you guys could help me with this, that would be grateful.. #include <stdio.h> #include <conio.h> int read_temps (float temps[]); int hot_days (int numOfTemp, float temps[]); int printf_temps (int numOfTemp, float temps[], int numOfHotDays); int main (void) { int index = 0; float tempVal; float temps[31]; int numOfTemp, numOfHotDays; do { printf ("Enter the temperature:"); scanf ("%f", &tempVal); if (tempVal!=-500.0) { temps[index] = tempVal; index++; } } while (tempVal != -500.0); return ; { int i; int count = 0; for (i = 0; i < numOfTemp; i++) { if (temps[i] > 32.0) count++; } return count; } { float sum = 0.0; int i; printf ("\nInput Temperatures:"); printf ("\n-------------------------"); for (i = 0;i < numOfTemp; i++) { printf ("\nDay %d : %.2fF", i+1, temps[i]); sum = sum + temps[i]; } printf ("\nNumber of Hot Days : %d", numOfHotDays); printf ("\nAverage Temperature: %.2f", sum/numOfTemp); } { clrscr (); numOfTemp = read_temps (temps); numOfHotDays = hot_days (numOfTemp, temps); clrscr (); printf_temps (numOfTemp, temps, numOfHotDays); getch (); } }

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  • exceptions in C++

    - by helloWorld
    I have some techniacal question, in this function: string report() const { if(list.begin() == list.end()){ throw "not good"; } //do something } if I throw exception what is going on with the program? Will my function terminate or it will run further? if it terminates, what value will it return?

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  • why is `vapply` safer than `sapply`?

    - by flodel
    The documentation says vapply is similar to sapply, but has a pre-specified type of return value, so it can be safer [...] to use. Could you please elaborate as to why it is generally safer, maybe provide examples? P.S.: I know the answer and I already tend to avoid sapply. I just wish there was a nice answer here on SO so I can point my coworkers to it. Please, no "read the manual" answer.

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  • Is there something in MySQL like IN but which uses AND instead of OR?

    - by Skatox
    I need a SQL statement to retrieve records where it key (or any column) is in a associate table, for example: documentId termId 4 1 4 2 3 3 5 1 This: SELECT documentId FROM table WHERE termId IN (1,2,3) ...will retrieve any documentid value where the termid value is 1 or 2 or 3. Is there something like this but return documentid values where the termid values are 1 and 2 and 3? Like an IN but with AND.

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  • When I do ""+1 I get a String - Why

    - by steve
    Hi, Please understand firstly that I fully understand that Java will return a String when I use ""+int. What I'm really not sure about is what exactly is happening down at the memory aspect. How exactly is java performing this conversion. I mean this in a very indepth way, not 'auto boxing' or anything like that :) I'm hoping someone with a deeper understanding can explain what exactly is done.

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  • What will be the output of this program? And why?

    - by Mac
    I came across a good example written below: class Test { private: int m_iX; public: Test(void): m_iX(0) { } ~Test(void) { } void Show() { printf("Hello World"); } }; int main() { Test* pTemp = NULL; pTemp->Show(); return 0; } But, what does this code mean and do? Thanks

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  • Will AJAX cause my site to have a high bounce % and hurt my search ratings?

    - by Cryo
    I'm building an art gallery website that updates its images via AJAX, for those who have javascript enabled, rather than request multiple page loads. I assume this will appear as though my site has a high bounce percentage. I understand that search engines will not be able to index dynamic content, but will such a misinterpreted bounce rate hurt my search engine ratings, even if I have many return visitors?

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