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  • C Programming: malloc() for a 2D array (using pointer-to-pointer)

    - by vikramtheone
    Hi Guys, yesterday I had posted a question: How should I pass a pointer to a function and allocate memory for the passed pointer from inside the called function? From the answers I got, I was able to understand what mistake I was doing. I'm facing a new problem now, can anyone help out with this? I want to dynamically allocate a 2D array, so I'm passing a Pointer-to-Pointer from my main() to another function called alloc_2D_pixels(...), where I use malloc(...) and for(...) loop to allocate memory for the 2D array. Well, after returning from the alloc_2D_pixels(...) function, the pointer-to-pointer still remains NULL, so naturally, when I try accessing or try to free(...) the Pointer-to-Pointer, the program hangs. Can anyone suggest me what mistakes I'm doing here? Help!!! Vikram SOURCE: main() { unsigned char **ptr; unsigned int rows, cols; if(alloc_2D_pixels(&ptr, rows, cols)==ERROR) // Satisfies this condition printf("Memory for the 2D array not allocated"); // NO ERROR is returned if(ptr == NULL) // ptr is NULL so no memory was allocated printf("Yes its NULL!"); // Because ptr is NULL, with any of these 3 statements below the program HANGS ptr[0][0] = 10; printf("Element: %d",ptr[0][0]); free_2D_alloc(&ptr); } signed char alloc_2D_pixels(unsigned char ***memory, unsigned int rows, unsigned int cols) { signed char status = NO_ERROR; memory = malloc(rows * sizeof(unsigned char** )); if(memory == NULL) { status = ERROR; printf("ERROR: Memory allocation failed!"); } else { int i; for(i = 0; i< cols; i++) { memory[i] = malloc(cols * sizeof(unsigned char)); if(memory[i]==NULL) { status = ERROR; printf("ERROR: Memory allocation failed!"); } } } // Inserted the statements below for debug purpose only memory[0][0] = (unsigned char)10; // I'm able to access the array from printf("\nElement %d",memory[0][0]); // here with no problems return status; } void free_2D_pixels(unsigned char ***ptr, unsigned int rows) { int i; for(i = 0; i < rows; i++) { free(ptr[i]); } free(ptr); }

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  • `var = something rescue nil` behaviour

    - by JP
    In ruby you can throw a rescue at the end of an assignment to catch any errors that might come up. I have a function (below: a_function_that_may_fail) where it's convenient to let it throw an error if certain conditions aren't met. The following code works well post = {} # Other Hash stuff post['Caption'] = a_function_that_may_fail rescue nil However I'd like to have post['Caption'] not even set if the function fails. I know I can do: begin post['Caption'] = a_function_that_may_fail recsue end but that feels a little excessive - is there a simpler solution?

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  • Getting relative path from absolute path in PHP

    - by SpawnCxy
    I noticed that there're some similar questions about this problem when I typed the title,but they seem not be in PHP.So what's the solution to it with a PHP function? To be specified. $a="/home/apache/a/a.php"; $b="/home/root/b/b.php"; $relpath = getRelativePath($a,$b);//needed function,should return '../../root/b/b.php' Any good ideas?Thanks.

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  • VB .Net LINQ query to determine whether more than one element has the same value for a property?

    - by Alex Hope O'Connor
    I am trying to write a LINQ query which will return true if there are multiple objects which have a property with the same value. Here is what I have come up with so far: Formatters.Where(Function(f As DataModel.Formatter) _ Formatters.Select(Function(f2 As DataModel.Formatter) f2.Name.ToLower()).Contains(f.Name.ToLower())).Count > 1 However the above always returns true as long as their are more then 1 elements in the list, can someone please give me a hand with this? Thanks, Alex.

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  • How to read date from the form and calculate a timestamp

    - by Vafello
    I would like to calculate a timestamp based on the input date. I would like to calculate it from the user input (something like 12/12/2011) I guess I need a function that changes the format to something readable for php and then calculate timestamp for this date. Maybe I should use strtotime() function? Any ideas will be appreciated. $date = $_POST['date']; <input type="text" name="date" value="">

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  • problem with ajax post

    - by zurna
    For some weird reason, the codes below are first working, then website is redirecting to the url. I used this code many times before without any problems, please please advise! Test page: http://www.refinethetaste.com/FLPM/?Section=myaccount&SubSection=signup <script type="text/javascript"> $(document).ready(function() { $("[name='submit']").click(function() { $.ajax({ type: "POST", data: $(".form-signup").serialize(), url: "http://www.refinethetaste.com/FLPM/content/myaccount/signup.cs.asp?Process=Add2Member", success: function(output) { $('.form-signup').html(output) }, error: function(output) { $('.form-signup').html(output); } }); }); }); </script> <form method="post" action="http://www.refinethetaste.com/FLPM/content/myaccount/signup.cs.asp?Process=Add2Member" class="form-signup"> <div class="clearfix"> <label for="MembersFullName">Full Name *:</label> <div class="username form-height"> <input id="modlgn_username" type="text" name="MembersFullName" value="" class="inputbox" size="18" /> </div> <label for="MembersEmailAddress">Email Address *:</label> <div class="username form-height"> <input id="modlgn_username" type="text" name="MembersEmailAddress" value="" class="inputbox" size="18" /> </div> <label for="MembersPassword">Password *:</label> <div class="password form-height"> <input id="modlgn_passwd" type="password" name="MembersPassword" class="inputbox" size="18" /> </div> <label for="MembersPasswordc">Password (confirm) *:</label> <div class="password form-height"> <input id="modlgn_passwd" type="password" name="MembersPasswordc" class="inputbox" size="18" /> </div> <div id="inputs"> <input type="checkbox" name="agree" class="checkbox" value="1" /> <label for="agree" class="agree">I agree to User Agreement and Privacy Policy.</label> </div> <div class="clear"> <input type="submit" name="submit" class="button-login png" value="Sign Up" /> </div> </div> <div id="form-login-remember"> <div class="form-indent-top"> <span class="login-text-1">Already Have Account?</span> <a href="?Section=myaccount&SubSection=signin"> Sign In</a> </div> </div> </form>

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  • What C++ library do I need to get this program to compile

    - by Phenom
    When I try to compile my program I get these errors: btio.c:19: error: ‘O_RDWR’ was not declared in this scope btio.c:19: error: ‘open’ was not declared in this scope btio.c: In function ‘short int create_tree()’: btio.c:56: error: ‘creat’ was not declared in this scope btio.c: In function ‘short int create_tree(int, int)’: btio.c:71: error: ‘creat’ was not declared in this scope what library do I need to include to fix these errors?

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  • Croping images with no loss using .NET

    - by zaladane
    I am trying to understand why after croping an image in .NET i end up with an image 3 times the size of the original image. Listed below is the code i am using to crop the image Private Shared Function CropImage(ByVal img As Image, ByVal cropArea As Rectangle) As Image Dim bmpImage As Bitmap = New Bitmap(img) Dim bmpCrop As Bitmap = bmpImage.Clone(cropArea, img.PixelFormat) Return CType(bmpCrop, Image) End Function where img is the original image loaded from file into an image object. How can i achieve a loss less cropping of my image?

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  • drawRect is not executing

    - by coure06
    I have ClockViewController.h and ClockViewController.m inherited from UIViewController. Also 2 other files ClockView.h and ClockView.m inherited from UIView. In Interface builder i have selected Class "ClockView" for the clock, but my drawRect is not executing. I am calling it via setNeedsDisplay from a timer function. even the timer function is not calling.

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  • Apache Email trace

    - by Sergio
    I'm using few PHP scripts for sending Email to website members. Is it possible to see at cPanel WHM mail statistic which PHP script was sent specific email using sendmail function? At section "View Relayers" I can see Time Sent, Message ID, Sender, Destination but not the script that fired this sendmail function.

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  • In CodeIgniter, how to clear "form data" after redirecting page

    - by Obay
    I'm not sure I explained it correctly in the question title, so here's the details: Login controller: function authenticate() { if ( authorized ) { redirect('lobby'); } else { redirect('login'); } } Lobby controller: function index() { //load lobby view } What happens is that in the login page, I enter user / pass, click Login, then authenticate() is called, and redirects me to the Lobby. However, when I click refresh while on the Lobby, the login form gets submitted again, so I get "logged in" again. How do I prevent that from happening?

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  • Automatic annotation for matlab plot?

    - by Tim
    Hi I have quite a few points plotted in a figure. I am now using annotation() function to add annotation in the same way for these points based on their locations. See my previous question. However they tend to mess up where the points are close to each other. Is there some function available to position the annotations as apart as possible? Thanks and regards!

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  • Jquery Plugins/Autocomplete Special Char problem

    - by Yetkin EREN
    Hi; i use that plugin for autocomplate; docs.jquery.com/Plugins/Autocomplete but i have a problem with spacial chars. if a special char first char of a word, this char has being ignored and if its not first char, chars before that has being ignored. for example: "slk" cant found but if i type "lk" "slk" found and if i type öd "aöd" found. i made a test page; http://www.yetkineren.com/Autocomplete/oto.html and tahts the code thanks.. <html> <head> <meta http-equiv="Content-Language" content="tr"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-9"> <script src="http://code.jquery.com/jquery-latest.js"></script> <link rel="stylesheet" href="jquery.autocomplete.css" type="text/css" /> <script type="text/javascript" src="encoder.js"></script> <script type="text/javascript" src="Scripts/jquery.bgiframe.min.js"></script> <script type="text/javascript" src="Scripts/jquery.autocomplete.js"></script> <script> $(document).ready(function(){ var gata=[ {"text": '21.png resmi aöd', "value": '21.png'}, {"text": '21.png resmi cöd', "value": '21.png'}, {"text": '21.png resmi acd', "value": '21.png'}, {"text": '21.png resmi aéd', "value": '21.png'}, {"text": '42.png resmi ésd', "value": '42.png'}, {"text": '63.png resmi aId', "value": '63.png'}, {"text": '34.png resmi Çsd', "value": '34.png'}, {"text": '65.png resmi jkl', "value": '65.png'}, {"text": '65.png resmi Gkl', "value": '65.png'}, {"text": '65.png resmi ökl', "value": '65.png'}, {"text": '65.png resmi slk', "value": '65.png'}, {"text": '65.png resmi lsk', "value": '65.png'}, {"text": '65.png resmi slk', "value": '65.png'}, {"text": '36.png resmi &#351;lk', "value": '36.png'} ]; $('#eksampil').autocomplete(gata, { width: 300, scroll: true, scrollHeight: 300, matchContains: "word", mustMatch: true, formatItem: function(row, i) { return i+". result <img src='images/" + row.value + "'/> " + row.text }, formatMatch: function(row) { //Encoder.EncodeType="entity"; return row.text //Encoder.EncodeType="entity"; //Encoder.htmlDecode( //Encoder.htmlEncode(i); }, formatResult: function(row) { return row.text } }); }); </script> </head> <body> <br> type "re" for see all: <input id="eksampil" /><br> </body> </html>

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  • What algorithm .Net use for searching a pattern in a string?

    - by Hun1Ahpu
    I'm studying string searching algorithms now and wondering what algorithm is used for .NET String.Contains function for example. Reflector shows that this function is used but I have no idea what its name means. private static extern int InternalFindNLSStringEx(IntPtr handle, string localeName, int flags, string source, int sourceCount, int startIndex, string target, int targetCount);

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  • wp_update_user crashes my plugin for wordpress

    - by Matt Facer
    I am trying to write a plugin which will update a user field. I can use the update user meta function OK, but when I try the wp_update_user it doesnt work. wp_update_user($user_ID, 'user_nicename', 'test'); That crashes the plugin. Do I need to include something for this function to work??

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  • Convert a value based on range

    - by Chris
    I need to convert a number to another value based on a range: ie: 7 = "A" 106 = "I" I have a range like this: from to return-val 1 17 A 17 35 B 35 38 C 38 56 D 56 72 E 72 88 F 88 98 G 98 104 H 104 115 I 115 120 J 120 123 K 123 129 L 129 infinity M The values are fixed and do not change. I was thinking a lookup table would be required, but is there a way it could be done with a function on an analytics function inside of oracle?

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  • Is marshaling/ serialization in PHP as simple as serialize($var) ?

    - by Ygam
    here's a definition of marshaling from Wikipedia: In computer science, marshalling (similar to serialization) is the process of transforming the memory representation of an object to a data format suitable for storage or transmission. It is typically used when data must be moved between different parts of a computer program or from one program to another. I have always done data serialization in php via its serialize function, usually on objects or arrays. But how is wikipedia's definition of marshaling/serialization takes place in this serizalize() function?

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  • Yahoo Web Scrapes: What are the limits?

    - by bvandrunen
    We are using a web scraper and have it set up to have a sleep function which has a random function set up (so that it isn't the same time between each scrape) but we are still getting blocked from Yahoo after 20-30 requests. Does any one know if there is a limit (i.e: 20 requests per minutes, 200 an hour) Right now our average between each request is around 3-6 seconds. Thanks for any help

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  • Convert Unix Epoch Time to Seconds in SQL or .NET

    - by user293249
    First let me thank you all for your help. What I need is a function that takes in a EPOCH time stamp, like 1452.235687 and converts it to a readable timestamp like '01-01-1970 00:00:00'. More specifically I only need the time not the date. If at all possible I would prefer a .NET function instead of a SQL stored procedure. However an SQL stored procedure would work fine as well. Thank you again,

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  • Pattern Matching with XSLT

    - by genesis11
    I'm trying to match a pattern into a string in XSLT/XPath using the matches function, as follows: <xsl:when test="matches('awesome','awe')"> ... </xsl:when> However, in both Firefox 3.5.9 and IE8, it doesn't show up. IE8 tells me that "'matches' is not a valid XSLT or XPath function." Is this due to XSLT 2.0 not being supported, and is there a way around this?

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  • question regarding the warning that comes everywhere

    - by user177893
    Hi, Would you be able to help to delete the warning discussed below ? I have one file example.h In that I declared static const NSString *variable = @"cool"; Now, I have another file multiple.m. In this file I have a function Bool var2 = [object methodname:variable]; It means, I passed variable as parameter for this function, but I got warning like this: variable is defined but not used So,how to remove this warning? please help me

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