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  • Problem using delete[] (Heap corruption) when implementing operator+= (C++)

    - by Darel
    I've been trying to figure this out for hours now, and I'm at my wit's end. I would surely appreciate it if someone could tell me when I'm doing wrong. I have written a simple class to emulate basic functionality of strings. The class's members include a character pointer data (which points to a dynamically created char array) and an integer strSize (which holds the length of the string, sans terminator.) Since I'm using new and delete, I've implemented the copy constructor and destructor. My problem occurs when I try to implement the operator+=. The LHS object builds the new string correctly - I can even print it using cout - but the problem comes when I try to deallocate the data pointer in the destructor: I get a "Heap Corruption Detected after normal block" at the memory address pointed to by the data array the destructor is trying to deallocate. Here's my complete class and test program: #include <iostream> using namespace std; // Class to emulate string class Str { public: // Default constructor Str(): data(0), strSize(0) { } // Constructor from string literal Str(const char* cp) { data = new char[strlen(cp) + 1]; char *p = data; const char* q = cp; while (*q) *p++ = *q++; *p = '\0'; strSize = strlen(cp); } Str& operator+=(const Str& rhs) { // create new dynamic memory to hold concatenated string char* str = new char[strSize + rhs.strSize + 1]; char* p = str; // new data char* i = data; // old data const char* q = rhs.data; // data to append // append old string to new string in new dynamic memory while (*p++ = *i++) ; p--; while (*p++ = *q++) ; *p = '\0'; // assign new values to data and strSize delete[] data; data = str; strSize += rhs.strSize; return *this; } // Copy constructor Str(const Str& s) { data = new char[s.strSize + 1]; char *p = data; char *q = s.data; while (*q) *p++ = *q++; *p = '\0'; strSize = s.strSize; } // destructor ~Str() { delete[] data; } const char& operator[](int i) const { return data[i]; } int size() const { return strSize; } private: char *data; int strSize; }; ostream& operator<<(ostream& os, const Str& s) { for (int i = 0; i != s.size(); ++i) os << s[i]; return os; } // Test constructor, copy constructor, and += operator int main() { Str s = "hello"; // destructor for s works ok Str x = s; // destructor for x works ok s += "world!"; // destructor for s gives error cout << s << endl; cout << x << endl; return 0; }

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  • JQuery class selectors like $(.someClass) are case sensitive?

    - by Justin Grant
    Given this HTML: <div class="OpenIDSelector">some text</div> Why does this JQuery selector match it on some browsers and some pages, but not on others? $('.OpenIdSelector) NOTE: I ran into this problem and solved it myself, but it was annoying and I didn't find it on StackOverflow already, so I'm posting it as a Q&A pair so someone else won't waste an hour like I did.

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  • How to call virtual function of an object in C++

    - by SoonDead
    I'm struggling with calling a virtual function in C++. I'm not experienced in C++, I mainly use C# and Java so I might have some delusions, but bear with me. I have to write a program where I have to avoid dynamic memory allocation if possible. I have made a class called List: template <class T> class List { public: T items[maxListLength]; int length; List() { length = 0; } T get(int i) const { if (i >= 0 && i < length) { return items[i]; } else { throw "Out of range!"; } }; // set the value of an already existing element void set(int i, T p) { if (i >= 0 && i < length) { items[i] = p; } else { throw "Out of range!"; } } // returns the index of the element int add(T p) { if (length >= maxListLength) { throw "Too many points!"; } items[length] = p; return length++; } // removes and returns the last element; T pop() { if (length > 0) { return items[--length]; } else { throw "There is no element to remove!"; } } }; It just makes an array of the given type, and manages the length of it. There is no need for dynamic memory allocation, I can just write: List<Object> objects; MyObject obj; objects.add(obj); MyObject inherits form Object. Object has a virtual function which is supposed to be overridden in MyObject: struct Object { virtual float method(const Input& input) { return 0.0f; } }; struct MyObject: public Object { virtual float method(const Input& input) { return 1.0f; } }; I get the elements as: objects.get(0).method(asdf); The problem is that even though the first element is a MyObject, the Object's method function is called. I'm guessing there is something wrong with storing the object in an array of Objects without dynamically allocating memory for the MyObject, but I'm not sure. Is there a way to call MyObject's method function? How? It's supposed to be a heterogeneous collection btw, so that's why the inheritance is there in the first place. If there is no way to call the MyObject's method function, then how should I make my list in the first place?

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  • drupal module, check if node type

    - by Mark
    As a more specific take on this question: http://stackoverflow.com/questions/2985518/drupal-jquery-1-4-on-specific-pages How do I check, inside a module, whether or not a node is a certain type to be able to do certain things to the node. Thanks

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  • What do you do when your page displays incorrectly on your server, but correctly in jsFiddle?

    - by Marcin
    I have a page which is displaying incorrectly in Firefox and Chrome (in that the tbodies do not show borders); however it displays correctly in jsfiddle (here: http://jsfiddle.net/JwkrD/ - both browsers). I'm not sure how to proceed - how do I get the tbodies to show up on my page in the same way as they do in jsfiddle? I'm using the same DOCTYPE, both pages are being served up with type text/html. I can't find any other differences.

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  • ASP.NET javascript close page after timeout?

    - by AliRiza Adiyahsi
    I want show an information page after success db opartions. And after the info I want to close each pages (information page and main page) I wrote this in button oncommand event: //but this code does not work Response.Write("<script language='javascript'>setTimeout('self.close();',3000);</script>"); at the same time, I want to show an information message. And then I want to close all, after three seconds.I hope I could explain :) Thanks.

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  • Remember (persist) the filter, sort order and current page of jqGrid

    - by Jimbo
    My application users asked if it were possible for pages that contain a jqGrid to remember the filter, sort order and current page of the grid (because when they click a grid item to carry out a task and then go back to it they'd like it to be "as they left it") Cookies seem to be the way forward, but how to get the page to load these and set them in the grid before it makes its first data request is a little beyond me at this stage. Does anyone have any experience with this kind of thing with jqGrid? Thanks!

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  • How to set HTML list as mx:DataGrid data provider?

    - by Ole Jak
    So I have Html like this http://trac.edgewall.org/wiki/RecentChanges (I want to create some Flash Track reader which will be opensource) I need to list in my DataGrid Index of all viki pages in form like +-----------+--------+ |page name |page url| +-----------+--------+ | name | url | +-----------+--------+

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  • newbee silverlight: how do i load a new Page?

    - by Michel
    Hi, i have multiple Pages (classes which derive from the Page object) in my silverlight app. I can load one in the app.xml with this statement: this.RootVisual = new ZoomData (); But what should i do when i have this page loaded, and i want to navigate to another page?

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  • dotnet nuke mysql

    - by user311166
    windows server 2003. i have an existing dotnetnuke website. ms sql is currently running and being used by dotnetnuke. i want to use mysql for other purposes. would installing mysql on the same server interfere with dotnetnuke? it seems that shortly after installing dotnetnuke our website stopped populating pages.

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  • Is there a way to use rsync and exclude files greater than a certain size?

    - by milesmeow
    I've checked out the man pages and did some searching but can't find info on ways to have rsync skip files greater than a certain size. We're doing rsync to an offline location and when someone puts a hug video file, the rsync jobs run into work hours. I've looked at the 'exclude' syntax and didn't see anything for excluding based on file size. Can I do it with rsync or should I look for other offline synching alternatives?

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  • What happens if an exception is thrown in finalize()

    - by Psykocyber
    What would happen if an exception is thrown during the execution of finalize()? Is the stack unwind like normally? Does it continue finalize() and ignore the exception? Does it stop finalize() and continue GC the object? Or something else? I'm not looking for guidelines of using finalize() there are plently of pages explaining that.

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  • Turn on PC power remotely through the Internet?

    - by W.N.
    I use SVN for my work at home and office, but I usually forget to commit the changes before shutdown. Therefore, I wish I could turn on my home/office PC at office/home. I already have TeamViewer installed on both PCs, so it will be okay as soon as the power is turned on. I have read many articles about this, I found both my PC and office computers support Wake-on-LAN. However, I don't know much about other config. And I need to turn on my computers through the Internet, not on LAN. My office Internet connection has static IP, however, my home Internet connection has dynamic IP, it changes as soon as I reset the modem, but it is not a big problem, I rarely turn the Internet modem off. And I don't have privilege to config office Internet connection, but I have Administration privilege on both PCs. Please give me details steps to turn on my office PC from home, and turn on my home PC from office.

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  • How to post data in PHP using file_get_contents?

    - by Paras Chopra
    I am using PHP's function file_get_contents() to fetch contents of a URL and then I process headers through the variable $http_response_header. Now the problem is that some of the URLs need some data to be posted to the URL (for example, login pages). How do I do that? I realize using stream_context I may be able to do that but I am not entirely clear. Thanks.

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  • Wordpress > Transfer google verification file to root directory on plugin activation/install

    - by Scott B
    I've got a wordpress plugin which presets several settings in a wordpress site and creates some default pages which are the same for all my sites. I would like to include an html file in my plugin zip package that is placed into the site's root directory "as is" (same file name, etc) The file is my google verification file, which is the same for all my sites, so I'd like to save a few steps and automate the process of installing it, along with my default setup steps that my plugin handles. Any help, much appreciated.

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  • How do I parse an HTML website using Perl?

    - by Nano HE
    Could you please give me some suggestions on how to parse HTML in Perl? I plan to parse the keywords(including URL links) and save them to a MySQL database. I am using Windows XP. Also, do I first need to download some website pages to the local hard drive with some offline Explorer tool? If I do, could you point me to a good download tool?

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  • Set generic iptables rules?

    - by tftd
    This may be a really dumb question but how can you open a port on multiple interfaces without defining the interfaces? For example how do I open port 22 on all interfaces? On my machine I have some interfaces that are dynamic and may or may not be available so I have to set "generic" rules. This code is not working for me but I can't figure out why: # My default policy is to drop the input. # The other policies are required like that. $IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT #Open port 22 on all interfaces ? $IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT So apparently there's something wrong with the last line... but I can't see it?

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