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• Qt, MSVC, and /Zc:wchar_t- == I want to blow up the world

  - by Noah Roberts

  So Qt is compiled with /Zc:wchar_t- on windows. What this means is that instead of wchar_t being a typedef for some internal type (__wchar_t I think) it becomes a typedef for unsigned short. The really cool thing about this is that the default for MSVC is the opposite, which of course means that the libraries you're using are likely compiled with wchar_t being a different type than Qt's wchar_t. This doesn't become an issue of course until you try to use something like std::wstring in your code; especially when one or more libraries have functions that accept it as parameters. What effectively happens is that your code happily compiles but then fails to link because it's looking for definitions using std::wstring<unsigned short...> but they only contain definitions expecting std::wstring<__wchar_t...> (or whatever). So I did some web searching and ran into this link: http://bugreports.qt.nokia.com/browse/QTBUG-6345 Based on the statement by Thiago Macieira, "Sorry, we will not support building Qt like this," I've been worried that fixing Qt to work like everything else might cause some problem and have been trying to avoid it. We recompiled all of our support libraries with the /Zc:wchar_t- flag and have been fairly content with that until a couple days ago when we started trying to port over (we're in the process of switching from Wx to Qt) some serialization code. Because of how win32 works, and because Wx just wraps win32, we've been using std::wstring to represent string data with the intent of making our product as i18n ready as possible. We did some testing and Wx did not work with multibyte characters when trying to print special stuff (even not so special stuff like the degree symbol was an issue). I'm not so sure that Qt has this problem since QString isn't just a wrapper to the underlying _TCHAR type but is a Unicode monster of some sort. At any rate, the serialization library in boost has compiled parts. We've attempted to recompile boost with /Zc:wchar_t- but so far our attempts to tell bjam to do this have gone unheeded. We're at an impasse. From where I'm sitting I have three options: Recompile Qt and hope it works with /Zc:wchar_t. There's some evidence around the web that others have done this but I have no way of predicting what will happen. All attempts to ask Qt people on forums and such have gone unanswered. Hell, even in that very bug report someone asks why and it just sat there for a year. Keep fighting with bjam until it listens. Right now I've got someone under me doing that and I have more experience fighting with things to get what I want but I do have to admit to getting rather tired of it. I'm also concerned that I'll KEEP running into this issue just because Qt wants to be a c**t. Stop using wchar_t for anything. Unfortunately my i18n experience is pretty much 0 but it seems to me that I just need to find the right to/from function in QString (it has a BUNCH) to encode the Unicode into 8-bytes and visa-versa. UTF8 functions look promising but I really want to be sure that no data will be lost if someone from Zimbabfuckegypt starts writing in their own language and the documentation in QString frightens me a little into thinking that could happen. Of course, I could always run into some library that insists I use wchar_t and then I'm back to 1 or 2 but I rather doubt that would happen. So, what's my question... Which of these options is my best bet? Is Qt going to eventually cause me to gouge out my own eyes because I decided to compile it with /Zc:wchar_t anyway? What's the magic incantation to get boost to build with /Zc:wchar_t- and will THAT cause permanent mental damage? Can I get away with just using the standard 8-bit (well, 'common' anyway) character classes and be i18n compliant/ready? How do other Qt developers deal with this mess?

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• Adding interactions to admin pages generated by the admin generator

  - by Stick it to THE MAN

  I am using Symfony 1.2.9 (with Propel ORM) to create a website. I have started using the admin generator to implement the admin functionality. I have come accross a slight 'problem' however. My models are related (e.g. one table may have several 1:N relations and N:N relations). I have not found a way to address this satisfactorily yet. As a tactical solution (for list views), I have decided to simply show the parent object, and then add interactions to show the related objects. I'll use a Blog model to illustrate this. Here are the relationships for a blog model: N:M relationship with Blogroll (models a blog roll) 1:N relationship with Blogpost (models a post submitted to a blog) I had originally intended on displaying the (paged) blogpost list for a blog,, when it was selected, using AJAX, but I am struggling enough with the admin generator as it is, so I have shelved that idea - unless someone is kind enough to shed some light on how to do this. Instead, what I am now doing (as a tactical/interim soln), is I have added interactions to the list view which allow a user to: View a list of the blog roll for the blog on that row View a list of the posts for the blog on that row Add a post for the blog on tha row In all of the above, I have written actions that will basically forward the request to the approriate action (admin generated). However, I need to pass some parameters (like the blog id etc), so that the correct blog roll or blog post list etc is returned. I am sure there is a better way of doing what I want to do, but in case there isn't here are my questions: How may I obtain the object that relates to a specific row (of the clicked link) in the list view (e.g. the blog object in this example) Once I have the object, I may choose to extract various fields: id etc. How can I pass these arguments to the admin generated action ? Regarding the second question, my guess is that this may be the way to do it (I may be wrong) public function executeMyAddedBlogRollInteractionLink(sfWebRequest $request) { // get the object *somehow* (I'm guessing this may work) $object = $this->getRoute()->getObject(); // retrieve the required parameters from the object, and build a query string $query_str=$object->getId(); //forward the request to the generated code (action to display blogroll list in this case) $this->forward('backendmodulename',"getblogrolllistaction?params=$query_string"); } This feels like a bit of a hack, but I'm not sure how else to go about it. I'm also not to keen on sending params (which may include user_id etc via a GET, even a POST is not that much safer, since it is fairly sraightforward to see what requests a browser is making). if there is a better way than what I suggest above to implement this kind of administration that is required for objects with 1 or more M:N relationships, I will be very glad to hear the "recommended" way of going about it. I remember reading about marking certain actions as internal. i.e. callable from only within the app. I wonder if that would be useful in this instance?

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• IE / Facebook Issue : Why Facebook Like box not display in Internet Explorer 6 - IE8 ?

  - by Vaibhav Bhalke

  IE / Facebook Issue : Why Facebook Like box not display in Internet Explorer6 - IE8 ? Facebook like box display throgh my web application on every browser excluding IE-IE8 Now final Application.html file contains are < !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/DTD/strict.dtd"><BR> < html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml"> <BR>< head> < meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> < /head><BR> < body> < script type="text/javascript" language="javascript" src="http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php"> < /script> <BR> < script type="text/javascript"> FB_RequireFeatures(["Connect"], function(){ var x=1; } ); < /script> <BR> < script src="http://static.ak.connect.facebook.com/connect.php/en_US" type="text/javascript"> < /script> < /body> < /html> My Java code for LIke Box is as follows FBPageFanWidget.java class FBPageFanWidget extends Composite { public FBPageFanWidget() { VerticalPanel mainPanel = new VerticalPanel(); mainPanel .getElement() .setInnerHTML( "< script type='text/javascript' src='http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US'>< /script>< script type='text/javascript'>FB.init('');< /script>< fb:fan profile_id=\"113106068709539\" stream=\"0\" connections=\"10\" logobar=\"0\" width=\"244\" height=\"240\" css='http://127.0.01:8080/webapplicationname/facebook.css?1'>< /fb:fan>"); initWidget(mainPanel); } } We used proper facebook API_KEY & PAGE_ID It's very important for us to Show Facebook like Box in Our web application Because we have more IE users. If we add FBPageFanWidget.java in our web applicaton then Our Home page is not display in IE because we add Facebook LikeBox so we made changes in Our FBPageFanWidget.java class FBPageFanWidget extends Composite { public FBPageFanWidget() { VerticalPanel mainPanel = new VerticalPanel(); if (!isIE()) { mainPanel.getElement() .setInnerHTML("<script type='text/javascript' src='http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US'></script><script type='text/javascript'>FB.init('');</script><fb:fan profile_id=\"113106068709539\" stream=\"0\" connections=\"10\" logobar=\"0\" width=\"244\" height=\"240\" css='http://127.0.01:8080/webapplicationname/facebook.css?1'></fb:fan>"); } initWidget(mainPanel); } public native String getUserAgent() /*-{ return navigator.userAgent; }-*/; private boolean isIE() { return (getUserAgent().indexOf("MSIE") > -1); } } when we did this changes Then Facebook Like Box display in every browser excluding IE6 - IE8 :( and also display Our Home page in IE8 excludeing Facebook Like Box. It means There is probelm in IE ? or what changes i need to do in my html file or java file to show facebook like Box properly with displaying our home page It's very important for us to Show Facebook like Box in Our web application Because we have more IE users. Please Reply ASAP. Hope-for Best Co-operation from your side !!!!

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• Delete / Remove node from XPathNodeIterator, given an XPath

  - by RymdPung

  First of all, if someone has a different, perhaps shorter (or better), solution to the problem, it's welcome as well. I'm trying to "simply" remove (almost) duplicate elements in XSLT. There's some (metadata) nodes i don't want to include when comparing, and i couldn't figure out how do do that in XSLT so thought i'd extend it with a function removing these nodes. Like so: <xsl:for-each select="abx:removeNodes(d/df600|d/df610|d/df611|d/df630|d/df650|d/df651|d/df655, '*[@key=&quot;i1&quot; or @key=&quot;i2&quot; or key=&quot;db&quot;]')"> <xsl:if test="not(node()=preceding-sibling::*)"> blah </xsl:if> </xsl:for-each> And the extension, which doesn't work so well... (C#) public XPathNodeIterator removeNodes(XPathNodeIterator p_NodeIterator, String removeXPath) { Logger Logger = new Logger("xslt"); Logger.Log("removeNodes(removeXPath={0}):", removeXPath); foreach (XPathNavigator CurrentNode in p_NodeIterator) { Logger.Log("removeNodes(): CurrentNode.OuterXml={0}.", CurrentNode.OuterXml); foreach (XPathNavigator CurrentSubNode in CurrentNode.Select(removeXPath)) { Logger.Log("removeNodes(): CurrentSubNode.OuterXml={0}.", CurrentSubNode.OuterXml); // How do i delete this node!? //CurrentSubNode.DeleteSelf(); } } return p_NodeIterator; } My initial approach using 'CurrentSubNode.DeleteSelf();' doesn't work because it gets confused and loses its position in the XPathNavigator, causing it to only delete the first item it finds using "removeXPath". Something like a DeleteAndMoveNext() would be nice but there seems to be no such method... Example data: <df650> <df650 key="i1"> </df650> <df650 key="i2">0</df650> <df650 key="a">foo</df650> <df650 key="x">bar</df650> <df650 key="db">someDB</df650> <df650 key="id">b2</df650> <df650 key="dsname">someDS</df650> </df650> ..and then another identical node (if you ignore the meta fields; db,id,dsname). <df650> <df650 key="i1"> </df650> <df650 key="i2">0</df650> <df650 key="a">foo</df650> <df650 key="x">bar</df650> <df650 key="db">someOtherDB</df650> <df650 key="id">b2</df650> <df650 key="dsname">someOtherDS</df650> </df650> The result should be... <df650> <df650 key="i1"> </df650> <df650 key="i2">0</df650> <df650 key="a">foo</df650> <df650 key="x">bar</df650> </df650>

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• Why does my finite state machine take so long to execute?

  - by BillyONeal

  Hello all :) I'm working on a state machine which is supposed to extract function calls of the form /* I am a comment */ //I am a comment perf("this.is.a.string.which\"can have QUOTES\"", 123456); where the extracted data would be perf("this.is.a.string.which\"can have QUOTES\"", 123456); from a file. Currently, to process a 41kb file, this process is taking close to a minute and a half. Is there something I'm seriously misunderstanding here about this finite state machine? #include <boost/algorithm/string.hpp> std::vector<std::string> Foo() { std::string fileData; //Fill filedata with the contents of a file std::vector<std::string> results; std::string::iterator begin = fileData.begin(); std::string::iterator end = fileData.end(); std::string::iterator stateZeroFoundLocation = fileData.begin(); std::size_t state = 0; for(; begin < end; begin++) { switch (state) { case 0: if (boost::starts_with(boost::make_iterator_range(begin, end), "pref(")) { stateZeroFoundLocation = begin; begin += 4; state = 2; } else if (*begin == '/') state = 1; break; case 1: state = 0; switch (*begin) { case '*': begin = boost::find_first(boost::make_iterator_range(begin, end), "*/").end(); break; case '/': begin = std::find(begin, end, L'\n'); } break; case 2: if (*begin == '"') state = 3; break; case 3: switch(*begin) { case '\\': state = 4; break; case '"': state = 5; } break; case 4: state = 3; break; case 5: if (*begin == ',') state = 6; break; case 6: if (*begin != ' ') state = 7; break; case 7: switch(*begin) { case '"': state = 8; break; default: state = 10; break; } break; case 8: switch(*begin) { case '\\': state = 9; break; case '"': state = 10; } break; case 9: state = 8; break; case 10: if (*begin == ')') state = 11; break; case 11: if (*begin == ';') state = 12; break; case 12: state = 0; results.push_back(std::string(stateZeroFoundLocation, begin)); }; } return results; } Billy3

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• Why isn't my algorithm for find the biggest and smallest inputs working?

  - by Matt Ellen

  I have started a new job, and with it comes a new language: Ironpython. Thankfully a good language :D Before starting I got to grips with Python on the whole, but that was only a week's worth of learning. Now I'm writing actual code. I've been charged with writing an algorithm that finds the best input parameter to collect data with. The basic algorithm is (as I've been instructed): Set the input parameter to a good guess Start collecting data When data is available stop collecting find the highest point If the point before this (i.e. for the previous parameter value) was higher and the point before that was lower then we've found the max otherwise the input parameter is increased by the initial guess. goto 2 If the max is found then the min needs to be found. To do this the algorithm carries on increasing the input, but by 1/10 of the max, until the current point is greater than the previous point and the point before that is also greater. Once the min is found then the algorithm stops. Currently I have a simplified data generator outputting the sin of the input, so that I know that the min value should be PI and the max value should be PI/2 The main Python code looks like this (don't worry, this is just for my edification, I don't write real code like this): import sys sys.path.append(r"F:\Programming Source\C#\PythonHelp\PythonHelp\bin\Debug") import clr clr.AddReferenceToFile("PythonHelpClasses.dll") import PythonHelpClasses from PHCStruct import Helper from System import Math helper = Helper() def run(): b = PythonHelpClasses.Executor() a = PythonHelpClasses.HasAnEvent() b.Input = 0.0 helper.__init__() def AnEventHandler(e): b.Stop() h = helper h.lastLastVal, h.lastVal, h.currentVal = h.lastVal, h.currentVal, e.Number if h.lastLastVal < h.lastVal and h.currentVal < h.lastVal and h.NotPast90: h.NotPast90 = False h.bestInput = h.lastInput inputInc = 0.0 if h.NotPast90: inputInc = Math.PI/10.0 else: inputInc = h.bestInput/10.0 if h.lastLastVal > h.lastVal and h.currentVal > h.lastVal and h.NotPast180: h.NotPast180 = False if h.NotPast180: h.lastInput, b.Input = b.Input, b.Input + inputInc b.Start(a) else: print "Best input:", h.bestInput print "Last input:", h.lastInput b.Stop() a.AnEvent += AnEventHandler b.Start(a) PHCStruct.py: class Helper(): def __init__(self): self.currentVal = 0 self.lastVal = 0 self.lastLastVal = 0 self.NotPast90 = True self.NotPast180 = True self.bestInput = 0 self.lastInput = 0 PythonHelpClasses has two small classes I wrote in C# before I realised how to do it in Ironpython. Executor runs a delegate asynchronously while it's running member is true. The important code: public void Start(HasAnEvent hae) { running = true; RunDelegate r = new RunDelegate(hae.UpdateNumber); AsyncCallback ac = new AsyncCallback(UpdateDone); IAsyncResult ar = r.BeginInvoke(Input, ac, null); } public void Stop() { running = false; } public void UpdateDone(IAsyncResult ar) { RunDelegate r = (RunDelegate)((AsyncResult)ar).AsyncDelegate; r.EndInvoke(ar); if (running) { AsyncCallback ac = new AsyncCallback(UpdateDone); IAsyncResult ar2 = r.BeginInvoke(Input, ac, null); } } HasAnEvent has a function that generates the sin of its input and fires an event with that result as its argument. i.e.: public void UpdateNumber(double val) { AnEventArgs e = new AnEventArgs(Math.Sin(val)); System.Threading.Thread.Sleep(1000); if (null != AnEvent) { AnEvent(e); } } The sleep is in there just to slow things down a bit. The problem I am getting is that the algorithm is not coming up with the best input being PI/2 and the final input being PI, but I can't see why. Also the best and final inputs are different each time I run the programme. Can anyone see why? Also when the algorithm terminates the best and final inputs are printed to the screen multiple times, not just once. Can someone explain why?

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• Undefined referencec to ...

  - by Patrick LaChance

  I keep getting this error message every time I try to compile, and I cannot find out what the problem is. any help would be greatly appreciated: C:\DOCUME~1\Patrick\LOCALS~1\Temp/ccL92mj9.o:main.cpp:(.txt+0x184): undefined reference to 'List::List()' C:\DOCUME~1\Patrick\LOCALS~1\Temp/ccL92mj9.o:main.cpp:(.txt+0x184): undefined reference to 'List::add(int)' collect2: ld returned 1 exit status code: //List.h ifndef LIST_H define LIST_H include //brief Definition of linked list class class List { public: /** \brief Exception for operating on empty list */ class Empty : public std::exception { public: virtual const char* what() const throw(); }; /** \brief Exception for invalid operations other than operating on an empty list */ class InvalidOperation : public std::exception { public: virtual const char* what() const throw(); }; /** \brief Node within List */ class Node { public: /** data element stored in this node */ int element; /** next node in list / Node next; /** previous node in list / Node previous; Node (int element); ~Node(); void print() const; void printDebug() const; }; List(); ~List(); void add(int element); void remove(int element); int first()const; int last()const; int removeFirst(); int removeLast(); bool isEmpty()const; int size()const; void printForward() const; void printReverse() const; void printDebug() const; /** enables extra output for debugging purposes */ static bool traceOn; private: /** head of list */ Node* head; /** tail of list */ Node* tail; /** count of number of nodes */ int count; }; endif //List.cpp I only included the parts of List.cpp that might be the issue include "List.h" include include using namespace std; List::List() { //List::size = NULL; head = NULL; tail = NULL; } List::~List() { Node* current; while(head != NULL) { current = head- next; delete current-previous; if (current-next!=NULL) { head = current; } else { delete current; } } } void List::add(int element) { Node* newNode; Node* current; newNode-element = element; if(newNode-element head-element) { current = head-next; } else { head-previous = newNode; newNode-next = head; newNode-previous = NULL; return; } while(newNode-element current-element) { current = current-next; } if(newNode-element <= current-element) { newNode-previous = current-previous; newNode-next = current; } } //main.cpp include "List.h" include include using namespace std; //void add(int element); int main (char** argv, int argc) { List* MyList = new List(); bool quit = false; string value; int element; while(quit==false) { cinvalue; if(value == "add") { cinelement; MyList-add(element); } if(value=="quit") { quit = true; } } return 0; } I'm doing everything I think I'm suppose to be doing. main.cpp isn't complete yet, just trying to get the add function to work first. Any help will be greatly appreciated.

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• Adding active class in menu only works on first page

  - by rileychuggins

  I have nav links that become active once they come into the window. I need to implement this on three separate pages on my website but the following scripts only work for the first page. var services_refresh = function () { // do stuff console.log('Stopped Scrolling'); if($('#ct_scans.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#ct_scans"]').addClass('active'); } else if($('#xray.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#xray"]').addClass('active'); } else if($('#fluoroscopy.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#fluoroscopy"]').addClass('active'); } else if($('#mri.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#mri"]').addClass('active'); } else if($('#neuroimaging.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#neuroimaging"]').addClass('active'); } else if($('#nuclear_medicine.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#nuclear_medicine"]').addClass('active'); } else if($('#ultrasound.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#ultrasound"]').addClass('active'); } else if($('#mammography.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#mammography"]').addClass('active'); } else if($('#breast_ultrasound.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_ultrasound"]').addClass('active'); } else if($('#breast_biopsy.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_biopsy"]').addClass('active'); } else if($('#breast_mri.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_mri"]').addClass('active'); } else if($('#osteoporosis.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#osteoporosis"]').addClass('active'); } }; Here is my HTML for the first page that works: <ul id="our_services_sub_sections" class="diagnostic_images"> <li><a class="scroll active" href="#ct_scans">CT Scans</a></li> <li><a class="scroll" href="#xray">X-Ray</a></li> <li><a class="scroll" href="#fluoroscopy">Fluoroscopy</a></li> <li><a class="scroll" href="#mri">MRI</a></li> <li><a class="scroll" href="#neuroimaging">Neuroimaging</a></li> <li><a class="scroll" href="#nuclear_medicine">Nuclear Medicine</a></li> <li><a class="scroll" href="#ultrasound">Ultrasound</a></li> </ul> Here is my HTML for the second page which does not work: <ul id="our_services_sub_sections" class="womens_imaging"> <li><a class="scroll active" href="#mammography">Mammography</a></li> <li><a class="scroll" href="#breast_ultrasound">Breast Ultrasound</a></li> <li><a class="scroll" href="#breast_biopsy">Breast Biopsy</a></li> <li><a class="scroll" href="#breast_mri">Breast MRI</a></li> <li><a class="scroll osteo" href="#osteoporosis">Osteoporosis<br />Evaluation (DEXA)</a></li> </ul> Why is this not working?

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• validating cascading dropdownlist

  - by shruti

  i am working on MVC.Net. in that i have used cascading dropdownlist. I want to do validations for blank field. the view page coding is: Select Category: <%= Html.DropDownList("Makes", ViewData["Makes"] as SelectList,"Select Category")% Select Subcategory: <%= Html.CascadingDropDownList("Models", "Makes")% the code on controller: public ActionResult AddSubCategoryPage() { var makeList = new SelectList(entityObj.Category.ToList(), "Category_id", "Category_name"); ViewData["Makes"] = makeList; // Create Models view data var modelList = new CascadingSelectList(entityObj.Subcategory1.ToList(), "Category_id", "Subcategory_id", "Subcategory_name"); ViewData["Models"] = modelList; return View("AddSubCategoryPage"); } and for that i have made one class: public static class JavaScriptExtensions { public static string CascadingDropDownList(this HtmlHelper helper, string name, string associatedDropDownList) { var sb = new StringBuilder(); // render select tag sb.AppendFormat("<select name='{0}' id='{0}'></select>", name); sb.AppendLine(); // render data array sb.AppendLine("<script type='text/javascript'>"); var data = (CascadingSelectList)helper.ViewDataContainer.ViewData[name]; var listItems = data.GetListItems(); var colArray = new List<string>(); foreach (var item in listItems) colArray.Add(String.Format("{{key:'{0}',value:'{1}',text:'{2}'}}", item.Key, item.Value, item.Text)); var jsArray = String.Join(",", colArray.ToArray()); sb.AppendFormat("$get('{0}').allOptions=[{1}];", name, jsArray); sb.AppendLine(); sb.AppendFormat("$addHandler($get('{0}'), 'change', Function.createCallback(bindDropDownList, $get('{1}')));", associatedDropDownList, name); sb.AppendLine(); sb.AppendLine("</script>"); return sb.ToString(); } } public class CascadingSelectList { private IEnumerable _items; private string _dataKeyField; private string _dataValueField; private string _dataTextField; public CascadingSelectList(IEnumerable items, string dataKeyField, string dataValueField, string dataTextField) { _items = items; _dataKeyField = dataKeyField; _dataValueField = dataValueField; _dataTextField = dataTextField; } public List<CascadingListItem> GetListItems() { var listItems = new List<CascadingListItem>(); foreach (var item in _items) { var key = DataBinder.GetPropertyValue(item, _dataKeyField).ToString(); var value = DataBinder.GetPropertyValue(item, _dataValueField).ToString(); var text = DataBinder.GetPropertyValue(item, _dataTextField).ToString(); listItems.Add(new CascadingListItem(key, value, text)); } return listItems; } } public class CascadingListItem { public CascadingListItem(string key, string value, string text) { this.Key = key; this.Value = value; this.Text = text; } public string Key { get; set; } public string Value { get; set; } public string Text { get; set; } } but when i run the aaplication it gives me following error: Server Error in '/' Application. The parameters dictionary contains a null entry for parameter 'Models' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult AddSubCategoryPage(Int32, System.String, System.String)' in 'CMS.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters . plz help me.

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• Website Link Injection

  - by Ryan B

  I have a website that is fairly static. It has some forms on it to send in contact information, mailing list submissions, etc. Perhaps hours/days after an upload to the site I found that the main index page had new code in it that I had not placed there that contained a hidden bunch of links in a invisible div. I have the following code the handles the variables sent in from the form. <?php // PHP Mail Order to [email protected] w/ some error detection. $jamemail = "[email protected]"; function check_input($data, $problem='') { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); if ($problem && strlen($data) == 0) { die($problem); } return $data; } $email = check_input($_POST['email'], "Please input email address."); $name = check_input($_POST['name'], "Please input name."); mail($jamemail, "Mailing List Submission", "Name: " . $name . " Email: " .$email); header('Location: index.php'); ?> I have the following code within the index page to present the form with some Javascript to do error detection on the content of the submission prior to submission. <form action="sendlist.php" method="post" onSubmit="return checkmaill(this);"> <label for="name"><strong>Name: </strong></label> <input type="text" name="name"/><br /> <label for="email"><strong>Email: </strong></label> <input type="text" name="email"/><br /> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="submit" value="Subscribe" style="width: 100px;"/> </form> At the end of the day, the source code where the injected hyperlinks is as follows: </body> </html><!-- google --><font style="position: absolute;overflow: hidden;height: 0;width: 0"> xeex172901 <a href=http://menorca.caeb.com/od9c2/xjdmy/onondaga.php>onondaga</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/tami.php>tami</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/shotguns.php>shotguns</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/weir.php>weir</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/copperhead.php>copperhead</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/mpv.php>mpv</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/brunei.php>brunei</a> <a href=http://menorca.caeb.com/od9c2/xjdmy/doreen.php>doreen</a>

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• Large number of soft page faults when assigning a TJpegImage to a TBitmap

  - by Robert Oschler

  I have a Delphi 6 Pro application that processes incoming jpeg frames from a streaming video server. The code works but I recently noticed that it generates a huge number of soft page faults over time. After doing some investigation, the page faults appear to be coming from one particular graphics operation. Note, the uncompressed bitmaps in question are 320 x 240 or about 300 KB in size so it's not due to the handling of large images. The number of page faults being generated isn't tolerable. Over an hour it can easily top 1000000 page faults. I created a stripped down test case that executes the code I have included below on a timer, 10 times a second. The page faults appear to happen when I try to assign the TJpegImage to a TBitmap in the GetBitmap() method. I know this because I commented out that line and the page faults do not occur. The assign() triggers a decompression operation on the part of TJpegImage as it pushes the decompressed bits into a newly created bitmap that GetBitmap() returns. When I run Microsoft's pfmon utility (page fault monitor), I get a huge number of soft page fault error lines concerning RtlFillMemoryUlong, so it appears to happen during a memory buffer fill operation. One puzzling note. The summary part of pfmon's report where it shows which DLL caused what page fault does not show any DLL names in the far left column. I tried this on another system and it happens there too. Can anyone suggest a fix or a workaround? Here's the code. Note, IReceiveBufferForClientSocket is a simple class object that holds bytes in an accumulating buffer. function GetBitmap(theJpegImage: TJpegImage): Graphics.TBitmap; begin Result := TBitmap.Create; Result.Assign(theJpegImage); end; // --------------------------------------------------------------- procedure processJpegFrame(intfReceiveBuffer: IReceiveBufferForClientSocket); var theBitmap: TBitmap; theJpegStream, theBitmapStream: TMemoryStream; theJpegImage: TJpegImage; begin theBitmap := nil; theJpegImage := TJPEGImage.Create; theJpegStream:= TMemoryStream.Create; theBitmapStream := TMemoryStream.Create; try // 2 // ************************ BEGIN JPEG FRAME PROCESSING // Load the JPEG image from the receive buffer. theJpegStream.Size := intfReceiveBuffer.numBytesInBuffer; Move(intfReceiveBuffer.bufPtr^, theJpegStream.Memory^, intfReceiveBuffer.numBytesInBuffer); theJpegImage.LoadFromStream(theJpegStream); // Convert to bitmap. theBitmap := GetBitmap(theJpegImage); finally // Free memory objects. if Assigned(theBitmap) then theBitmap.Free; if Assigned(theJpegImage) then theJpegImage.Free; if Assigned(theBitmapStream) then theBitmapStream.Free; if Assigned(theJpegStream) then theJpegStream.Free; end; // try() end; // --------------------------------------------------------------- procedure TForm1.Timer1Timer(Sender: TObject); begin processJpegFrame(FIntfReceiveBufferForClientSocket); end; // --------------------------------------------------------------- procedure TForm1.FormCreate(Sender: TObject); var S: string; begin FIntfReceiveBufferForClientSocket := TReceiveBufferForClientSocket.Create(1000000); S := loadStringFromFile('c:\test.jpg'); FIntfReceiveBufferForClientSocket.assign(S); end; // --------------------------------------------------------------- Thanks, Robert

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• fetch HTML Element object using javascript, mootools

  - by Avinash

  Hi, Please check my HTML below: <table cellpadding="0" cellpadding="0" border="0"> <tr> <td> <div class="toogler">Demo1</div> </td> </tr> <tr> <td> <div class="element">Demo1 Content</div> </td> </tr> <tr> <td> <div class="toogler">Demo1</div> </td> </tr> <tr> <td> <div class="element">Demo1 Content</div> </td> </tr> <tr> <td> <div class="toogler">Demo2</div> </td> </tr> <tr> <td> <div class="element">Demo2 Content</div> </td> </tr> <tr> <td> <div class="toogler">Demo3</div> </td> </tr> <tr> <td> <div class="element">Demo3 Content</div> </td> </tr> <tr> <td> <div class="toogler">Demo4</div> </td> </tr> <tr> <td> <div class="element">Demo4 Content</div> </td> </tr> </table> Here is my JS Code: <script type="text/javascript" language="javascript"> $$('.toogler').each(function(e){ alert(e); // this will alert all the toogler div object }); </script> my problem is that how can i fetch the object of the next div with class element if i have object of the first toogler then how can i get the object of the next first div which class 'element' I don't want to give the ids to the elements

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• c - fork() and wait()

  - by Joe

  Hi there, I need to use the fork() and wait() functions to complete an assignment. We are modelling non-deterministic behaviour and need the program to fork() if there is more than one possible transition. In order to try and work out how fork and wait work, I have just made a simple program. I think I understand now how the calls work and would be fine if the program only branched once because the parent process could use the exit status from the single child process to determine whether the child process reached the accept state or not. As you can see from the code that follows though, I want to be able to handle situations where there must be more than one child processes. My problem is that you seem to only be able to set the status using an _exit function once. So, as in my example the exit status that the parent process tests for shows that the first child process issued 0 as it's exit status, but has no information on the second child process. I tried simply not _exit()-ing on a reject, but then that child process would carry on, and in effect there would seem to be two parent processes. Sorry for the waffle, but I would be grateful if someone could tell me how my parent process could obtain the status information on more than one child process, or I would be happy for the parent process to only notice accept status's from the child processes, but in that case I would successfully need to exit from the child processes which have a reject status. My test code is as follows: #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <errno.h> #include <sys/wait.h> int main(void) { pid_t child_pid, wpid, pid; int status = 0; int i; int a[3] = {1, 2, 1}; for(i = 1; i < 3; i++) { printf("i = %d\n", i); pid = getpid(); printf("pid after i = %d\n", pid); if((child_pid = fork()) == 0) { printf("In child process\n"); pid = getpid(); printf("pid in child process is %d\n", pid); /* Is a child process */ if(a[i] < 2) { printf("Should be accept\n"); _exit(1); } else { printf("Should be reject\n"); _exit(0); } } } if(child_pid > 0) { /* Is the parent process */ pid = getpid(); printf("parent_pid = %d\n", pid); wpid = wait(&status); if(wpid != -1) { printf("Child's exit status was %d\n", status); if(status > 0) { printf("Accept\n"); } else { printf("Complete parent process\n"); if(a[0] < 2) { printf("Accept\n"); } else { printf("Reject\n"); } } } } return 0; } Many thanks Joe

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• Can a conforming C implementation #define NULL to be something wacky

  - by janks

  I'm asking because of the discussion that's been provoked in this thread: http://stackoverflow.com/questions/2597142/when-was-the-null-macro-not-0/2597232 Trying to have a serious back-and-forth discussion using comments under other people's replies is not easy or fun. So I'd like to hear what our C experts think without being restricted to 500 characters at a time. The C standard has precious few words to say about NULL and null pointer constants. There's only two relevant sections that I can find. First: 3.2.2.3 Pointers An integral constant expression with the value 0, or such an expression cast to type void * , is called a null pointer constant. If a null pointer constant is assigned to or compared for equality to a pointer, the constant is converted to a pointer of that type. Such a pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function. and second: 4.1.5 Common definitions <stddef.h> The macros are NULL which expands to an implementation-defined null pointer constant; The question is, can NULL expand to an implementation-defined null pointer constant that is different from the ones enumerated in 3.2.2.3? In particular, could it be defined as: #define NULL __builtin_magic_null_pointer Or even: #define NULL ((void*)-1) My reading of 3.2.2.3 is that it specifies that an integral constant expression of 0, and an integral constant expression of 0 cast to type void* must be among the forms of null pointer constant that the implementation recognizes, but that it isn't meant to be an exhaustive list. I believe that the implementation is free to recognize other source constructs as null pointer constants, so long as no other rules are broken. So for example, it is provable that #define NULL (-1) is not a legal definition, because in if (NULL) do_stuff(); do_stuff() must not be called, whereas with if (-1) do_stuff(); do_stuff() must be called; since they are equivalent, this cannot be a legal definition of NULL. But the standard says that integer-to-pointer conversions (and vice-versa) are implementation-defined, therefore it could define the conversion of -1 to a pointer as a conversion that produces a null pointer. In which case if ((void*)-1) would evaluate to false, and all would be well. So what do other people think? I'd ask for everybody to especially keep in mind the "as-if" rule described in 2.1.2.3 Program execution. It's huge and somewhat roundabout, so I won't paste it here, but it essentially says that an implementation merely has to produce the same observable side-effects as are required of the abstract machine described by the standard. It says that any optimizations, transformations, or whatever else the compiler wants to do to your program are perfectly legal so long as the observable side-effects of the program aren't changed by them. So if you are looking to prove that a particular definition of NULL cannot be legal, you'll need to come up with a program that can prove it. Either one like mine that blatantly breaks other clauses in the standard, or one that can legally detect whatever magic the compiler has to do to make the strange NULL definition work. Steve Jessop found an example of way for a program to detect that NULL isn't defined to be one of the two forms of null pointer constants in 3.2.2.3, which is to stringize the constant: #define stringize_helper(x) #x #define stringize(x) stringize_helper(x) Using this macro, one could puts(stringize(NULL)); and "detect" that NULL does not expand to one of the forms in 3.2.2.3. Is that enough to render other definitions illegal? I just don't know. Thanks!

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• Are free operator->* overloads evil?

  - by Potatoswatter

  I was perusing section 13.5 after refuting the notion that built-in operators do not participate in overload resolution, and noticed that there is no section on operator->*. It is just a generic binary operator. Its brethren, operator->, operator*, and operator[], are all required to be non-static member functions. This precludes definition of a free function overload to an operator commonly used to obtain a reference from an object. But the uncommon operator->* is left out. In particular, operator[] has many similarities. It is binary (they missed a golden opportunity to make it n-ary), and it accepts some kind of container on the left and some kind of locator on the right. Its special-rules section, 13.5.5, doesn't seem to have any actual effect except to outlaw free functions. (And that restriction even precludes support for commutativity!) So, for example, this is perfectly legal (in C++0x, remove obvious stuff to translate to C++03): #include <utility> #include <iostream> #include <type_traits> using namespace std; template< class F, class S > typename common_type< F,S >::type operator->*( pair<F,S> const &l, bool r ) { return r? l.second : l.first; } template< class T > T & operator->*( pair<T,T> &l, bool r ) { return r? l.second : l.first; } template< class T > T & operator->*( bool l, pair<T,T> &r ) { return l? r.second : r.first; } int main() { auto x = make_pair( 1, 2.3 ); cerr << x->*false << " " << x->*4 << endl; auto y = make_pair( 5, 6 ); y->*(0) = 7; y->*0->*y = 8; // evaluates to 7->*y = y.second cerr << y.first << " " << y.second << endl; } I can certainly imagine myself giving into temp[la]tation. For example, scaled indexes for vector: v->*matrix_width[2][5] = x; Did the standards committee forget to prevent this, was it considered too ugly to bother, or are there real-world use cases?

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• I'm trying to handle the updates on 2 related tables in one DetailsView using Jquery and Linq, and h

  - by Ben Reisner

  Given two related tables (reports, report_fields) where there can be many report_fields entries for each reports entry, I need to allow the user to enter new report_fields, delete existing report_fields, and re-arrange the order. Currently I am using a DetailsView to handle the editing of the reports. I added some logic to handle report_fields, and currently it allows you to succesfully re-arrange the order, but i'm a little stumped as to the best way to add new items, or delete existing items. The basic logic I have is that each report_fields is represented by a . It has a description as the text, and a field for each field in the report_fields table. I use JQuery Sortable to allow the user to re-arrange the LIs. Abbreviated Create Table Statements:(foreign key constraint ignored for brevity) create table report( id integer primary key identity, reportname varchar(250) ) create table report_fields( id integer primary key identity, reportID integer, keyname integer, keyvalue integer, field_order integer ) My abbreviated markup: <asp:DetailsView ...> ... <asp:TemplateField HeaderText="Fields"> <EditItemTemplate> <ul class="MySortable"> <asp:Repeater ID="Repeater1" runat="server" DataSource='<%# Eval("report_fields") %>'> <ItemTemplate> <li> <%# Eval("keyname") %>: <%# Eval("keyvalue") %> <input type="hidden" name="keyname[]" value='<%# Eval("keyname") %>' /> <input type="hidden" name="keyvalue[]" value='<%# Eval("keyvalue") %>' /> </li> </ItemTemplate> </asp:Repeater> </ul> </EditItemTemplate> </asp:TemplateField> </asp:DetailsView> <asp:LinqDataSource ID="LinqDataSource2" onupdating="LinqDataSource2_Updating" table=reports ... /> $(function() { $(".MySortable").sortable({ placeholder: 'MySortable-highlight' }).disableSelection(); }); Code Behind Class: public partial class Administration_AddEditReport protected void LinqDataSource2_Updating(object sender, LinqDataSourceUpdateEventArgs e) { report r = (report)e.NewObject; MyDataContext dc = new MyDataContext(); var fields = from f in dc.report_fields where f.reportID == r.id select f; dc.report_fields.DeleteAllOnSubmit(fields); NameValueCollection nvc = Request.Params; string[] keyname = nvc["keyname[]"].Split(','); string[] keyvalue = nvc["keyvalue[]"].Split(','); for (int i = 0; i < keyname.Length; i++) { report_field rf = new report_field(); rf.reportID = r.id; rf.keyname = keyname[i]; rf.keyvalue = keyvalue[i]; rf.field_order = i; dc.report_fields.InsertOnSubmit(rf); } dc.SubmitChanges(); } }

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• to understand the code- how the heap is written in process migration in solaris

  - by akshay

  hi guys i need help understanding what this piece of code actually does as it is a part of my project i am stuck here. the code is from libckpt on solaris. /********************************** * function: write_heap * args: map_fd -- file descriptor for map file * data_fd -- file descriptor for data file * returns: no. of chunks written on success, -1 on failure * side effects: writes all included segments of the heap to ckpt files * misc.: If we are forking and copyonwrite is set, we will write the heap from bottom to top, moving the brk pointer up each time so that we don't get a page copied if the * called from: take_ckpt() ***********************************/ static int write_heap(int map_fd, int data_fd) { Dlist curptr, endptr; int no_chunks=0, pn; long size; caddr_t stop, addr; if(ckptflags.incremental){ /-- incremental checkpointing on? --/ endptr = ckptglobals.inc_list-main-flink; /*-- for each included chunk of the heap --*/ for(curptr = ckptglobals.inc_list->main->blink->blink; curptr != endptr; curptr = curptr->blink){ /*-- write out the last page in the included chunk --*/ stop = curptr->addr; pn = ((long)curptr->stop - (long)sys.DATASTART) / PAGESIZE; if(isdirty(pn)){ addr = (caddr_t)max((long)curptr->addr, (long)((pn * PAGESIZE) + sys.DATASTART)); size = (long)curptr->stop - (long)addr; debug(stderr, "DEBUG: Writing heap from 0x%x to 0x%x, pn = %d\n", addr, addr+size, pn); if(write_chunk(addr, size, map_fd, data_fd) == -1){ return -1; } if((int)addr > (int)(&end) && ckptflags.enhanced_fork){ brk(addr); } no_chunks++; } /*-- write out all the whole pages in the middle of the chunk --*/ for(pn--; pn * PAGESIZE + sys.DATASTART >= stop; pn--){ if(isdirty(pn)){ addr = (caddr_t)((pn * PAGESIZE) + sys.DATASTART); debug(stderr, "DEBUG: Writing heap from 0x%x to 0x%x, pn = %d\n", addr, addr+PAGESIZE, pn); if(write_chunk(addr, PAGESIZE, map_fd, data_fd) == -1){ return -1; } if((int)addr > (int)(&end) && ckptflags.enhanced_fork){ brk(addr); } no_chunks++; } } /*-- write out the first page in the included chunk --*/ addr = curptr->addr; size = ((pn+1) * PAGESIZE + sys.DATASTART) - addr; if(size > 0 && (isdirty(pn))){ debug(stderr, "DEBUG: Writing heap from 0x%x to 0x%x\n", addr, addr+size); if(write_chunk(addr, size, map_fd, data_fd) == -1){ return -1; } if((int)addr > (int)(&end) && ckptflags.enhanced_fork){ brk(addr); } no_chunks++; } } } else{ /-- incremental checkpointing off! --/ endptr = ckptglobals.inc_list-main-blink; /*-- for each included chunk of the heap --*/ for(curptr = ckptglobals.inc_list->main->flink->flink; curptr != endptr; curptr = curptr->flink){ debug(stderr, "DEBUG: saving memory from 0x%x to 0x%x\n", curptr->addr, curptr->addr+curptr->size); if(write_chunk(curptr->addr, curptr->size, map_fd, data_fd) == -1){ return -1; } if((int)addr > (int)(&end) && ckptflags.enhanced_fork){ brk(addr); } no_chunks++; } } return no_chunks; }

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• Why does my token return NULL and how can I fix it?(c++)

  - by Van

  I've created a program to get a string input from a user and parse it into tokens and move a robot according to the input. The program is supposed to recognize these inputs(where x is an integer): "forward x" "back x" "turn left x" "turn right x" and "stop". The program does what it's supposed to for all commands except for "stop". When I type "stop" the program prints out "whats happening?" because I've written a line which states: if(token == NULL) { cout << "whats happening?" << endl; } Why does token get NULL, and how can I fix this so it will read "stop" properly? here is the code: bool stopper = 0; void Navigator::manualDrive() { VideoStream video(&myRobot, 0);//allows user to see what robot sees video.startStream(); const int bufSize = 42; char uinput[bufSize]; char delim[] = " "; char *token; while(stopper == 0) { cout << "Enter your directions below: " << endl; cin.getline(uinput,bufSize); Navigator::parseInstruction(uinput); } } /* parseInstruction(char *c) -- parses cstring instructions received * and moves robot accordingly */ void Navigator::parseInstruction(char * uinput) { char delim[] = " "; char *token; // cout << "Enter your directions below: " << endl; // cin.getline (uinput, bufSize); token=strtok(uinput, delim); if(token == NULL) { cout << "whats happening?" << endl; } if(strcmp("forward", token) == 0) { int inches; token = strtok(NULL, delim); inches = atoi (token); double value = fabs(0.0735 * fabs(inches) - 0.0550); myRobot.forward(1, value); } else if(strcmp("back",token) == 0) { int inches; token = strtok(NULL, delim); inches = atoi (token); double value = fabs(0.0735 * fabs(inches) - 0.0550); myRobot.backward(1/*speed*/, value/*time*/); } else if(strcmp("turn",token) == 0) { int degrees; token = strtok(NULL, delim); if(strcmp("left",token) == 0) { token = strtok(uinput, delim); degrees = atoi (token); double value = fabs(0.00467 * degrees - 0.04); myRobot.turnLeft(1/*speed*/, value/*time*/); } else if(strcmp("right",token) == 0) { token = strtok(uinput, delim); degrees = atoi (token); double value = fabs(0.00467 * degrees - 0.04); myRobot.turnRight(1/*speed*/, value/*time*/); } } else if(strcmp("stop",token) == 0) { stopper = 1; } else { std::cerr << "Unknown command '" << token << "'\n"; } } /* autoDrive() -- reads in file from ifstream, parses * and moves robot according to instructions in file */ void Navigator::autoDrive(string filename) { const int bufSize = 42; char fLine[bufSize]; ifstream infile; infile.open("autodrive.txt", fstream::in); while (!infile.eof()) { infile.getline(fLine, bufSize); Navigator::parseInstruction(fLine); } infile.close(); } I need this to break out of the while loop and end manualDrive because in my driver program the next function called is autoDrive.

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• How do I pass session variables from one domain to another in PHP

  - by Dave

  Hi everyone, I have encountered a situation where I need to pass $_SESSION variables from one domain to an iFrame page from another domain. I have spent the last 16 days trying various methods to no avail. I think that the only logical way would be to encode the variables in the url that calls the iFrame and decode them in th iFrame page. I am not sure how to go about this and I am looking for any samples, assistance etc that I can find. Thanks for any and all suggestions. Here is an example of what I am trying to do... Example: <!-- Note only using hidden as I didn't want to build the form at test phase--> <form name="test" method="post" action="iframe_test.php"> <input type="submit" name="Submit" /> <input type="hidden" name="fName" value="abc" /> <input type="hidden" name="lName" value="def" /> <input type="hidden" name="address1" value="ghi" /> <input type="hidden" name="address2" value="jkl" /> <input type="hidden" name="country" value="mno" /> <input type="hidden" name="postal_code" value="pqr" /> <input type="hidden" name="city" value="stu" /> <input type="hidden" name="retUrl" value="vwx"> <input type="hidden" name="decUrl" value="yz"> So from here I am hitting the iframe_test.php and doing the following: PHP Code: function StripSpecChar($val) { return (preg_replace('/[^a-zA-Z0-9" "-.@\:\/_]/','', $val)); } foreach ($_POST as $key => $val) { $_SESSION[$key] = StripSpecChar($val); } and I get a session array that looks like this: Code: Array ( [fName] => abc [lName] => def [address1] => ghi [address2] => jkl [country] => mno [postal_code] => pqr [city] => stu [retUrl] => vwx [decUrl] => yz ) Still all good so far....call the iFrame Code: <body> Some page stuff here <div align="center"><span class="style1"><strong>This is the iFrame Page</strong></span> </div> <div align="center"> <iframe src="https://www.other_domain.org/iframe/reserve.php" width="500" height="350" frameBorder="0"></iframe> </div> </body> So HOW do I take... $_SESSION['fName']['abc']; $_SESSION['lName']['def']; $_SESSION['address1']['ghi']; $_SESSION['address2']['jkl']; $_SESSION['country']['mno']; $_SESSION['postal_code']['pqr']; $_SESSION['city']['stu']; $_SESSION['retUrl']['vwx']; $_SESSION['decUrl']['yz']; and turn it into the encoded url that I am looking for? Further once that is done how to I get the session vars back as session vars on that new domain iFrame page...

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• Socket in C: recv overwrite a char[]

  - by Possa

  Hi all, I'm trying to make a little client-server script like many others that I've done in the past. But in this one I have a problem. It is better if I post the code and the output it give me. Code: #include <mysql.h> //not important now #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> #include <string.h> //constant definition #define SERVER_PORT 2121 #define LINESIZE 21 //global var definition char victim_ip[LINESIZE], file_write[LINESIZE], hacker_ip[LINESIZE]; //function void leggi (int); //not use now for debugging purpose //void scriviDB (); //not important now main () { int sock, client_len, fd; struct sockaddr_in server, client; // transport end point if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("system call socket fail"); exit(1); } server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("10.10.10.1"); server.sin_port = htons(SERVER_PORT); // binding address at transport end point if (bind(sock, (struct sockaddr *)&server, sizeof server) == -1) { perror("system call bind fail"); exit(1); } //fprintf(stderr, "Server open: listening.\n"); listen(sock, 5); /* managae client connection */ while (1) { client_len = sizeof(client); if ((fd = accept(sock, (struct sockaddr *)&client, &client_len)) < 0) { perror("accepting connection"); exit(1); } strcpy(hacker_ip, inet_ntoa(client.sin_addr)); printf("1 %s\n", hacker_ip); //debugging purpose //leggi(fd); ////////////////////////// //receive client recv(fd, victim_ip, LINESIZE, 0); victim_ip[sizeof(victim_ip)] = '\0'; printf("2 %s\n", hacker_ip); //debugging purpose recv(fd, file_write, LINESIZE, 0); file_write[sizeof(file_write)] = '\0'; printf("3 %s\n", hacker_ip); //debugging purpose printf("%s@%s for %s\n", file_write, victim_ip, hacker_ip); //send to client send(fd, hacker_ip, 40, 0); //now is hacker_ip for debug ///////////////////////// close(fd); }//end while exit(0); } //end main Client send string: ./send -i 10.10.10.4 -f filename.ext so the script send -i (IP) and -f (FILE) at the server. Here's my output server side: 1 10.10.10.6 2 10.10.10.6 3 [email protected] for As you can see the printf(3) and the printf(ip,file,ip) fail. I don't know how and where but someone overwrite my hacker_ip string. Thanks for your help! :)

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• SVG: About using <defs> and <use> with variable text values

  - by Lukman

  Hi, I have the following SVG source code that generates a number of boxes with texts: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20050904/DTD/svg11.dtd"> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="600" height="600"> <defs> </defs> <title>Draw</title> <g transform="translate(50,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text</text> </g> <g transform="translate(150,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text 2</text> </g> <g transform="translate(250,40)"> <rect width="80" height="30" x="0" y="-20" style="stroke: black; stroke-opacity: 1; stroke-width: 1; fill: #9dc2de" /> <text text-anchor="middle" x="40">Text 3</text> </g> </svg> As you can see, I repeated the <g></g> three times to get three such boxes, when SVG has <defs> and <use> elements that allow reusing elements using id references instead of repeating their definitions. Something like: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20050904/DTD/svg11.dtd"> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="600" height="600"> <defs> <marker style="overflow:visible;fill:inherit;stroke:inherit" id="Arrow1Mend" refX="0.0" refY="0.0" orient="auto"> <path transform="scale(0.4) rotate(180) translate(20,0)" style="fill-rule:evenodd;stroke-width:2.0pt;marker-start:none;" d="M 0.0,-15.0 L -20.5,0.0 L 0.0,15.0 "/> </marker> <line marker-end="url(#Arrow1Mend)" id="systemthread" x1="40" y1="10" x2="40" y2="410" style="stroke: black; stroke-dasharray: 5, 5; stroke-width: 1; "/> </defs> <title>Draw</title> <use xlink:href="#systemthread" transform="translate(50,40)" /> <use xlink:href="#systemthread" transform="translate(150,40)" /> <use xlink:href="#systemthread" transform="translate(250,40)" /> </svg> Unfortunately I can't do this with the first SVG code since I need the texts to be different for each box, while the <use> tag simply duplicates 100% what's defined in <defs>. Is there any way to use <defs> and <use> with some kind of parameters/arguments mechanism like function calls?

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• 42 passed to TerminateProcess, sometimes GetExitCodeProcess returns 0

  - by Emil

  After I get a handle returned by CreateProcess, I call TerminateProcess, passing 42 for the process exit code. Then, I use WaitForSingleObject for the process to terminate, and finally I call GetExitCodeProcess. None of the function calls report errors. The child process is an infinite loop and does not terminate on its own. The problem is that sometimes GetExitCodeProcess returns 42 for the exit code (as it should) and sometimes it returns 0. Any idea why? #include <string> #include <sstream> #include <iostream> #include <assert.h> #include <windows.h> void check_call( bool result, char const * call ); #define CHECK_CALL(call) check_call(call,#call); int main( int argc, char const * argv[] ) { if( argc>1 ) { assert( !strcmp(argv[1],"inf") ); for(;;) { } } int err=0; for( int i=0; i!=200; ++i ) { STARTUPINFO sinfo; ZeroMemory(&sinfo,sizeof(STARTUPINFO)); sinfo.cb=sizeof(STARTUPINFO); PROCESS_INFORMATION pe; char cmd_line[32768]; strcat(strcpy(cmd_line,argv[0])," inf"); CHECK_CALL((CreateProcess(0,cmd_line,0,0,TRUE,0,0,0,&sinfo,&pe)!=0)); CHECK_CALL((CloseHandle(pe.hThread)!=0)); CHECK_CALL((TerminateProcess(pe.hProcess,42)!=0)); CHECK_CALL((WaitForSingleObject(pe.hProcess,INFINITE)==WAIT_OBJECT_0)); DWORD ec=0; CHECK_CALL((GetExitCodeProcess(pe.hProcess,&ec)!=0)); CHECK_CALL((CloseHandle(pe.hProcess)!=0)); err += (ec!=42); } std::cout << err; return 0; } std::string get_last_error_str( DWORD err ) { std::ostringstream s; s << err; LPVOID lpMsgBuf=0; if( FormatMessageA( FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS, 0, err, MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT), (LPSTR)&lpMsgBuf, 0, 0) ) { assert(lpMsgBuf!=0); std::string msg; try { std::string((LPCSTR)lpMsgBuf).swap(msg); } catch( ... ) { } LocalFree(lpMsgBuf); if( !msg.empty() && msg[msg.size()-1]=='\n' ) msg.resize(msg.size()-1); if( !msg.empty() && msg[msg.size()-1]=='\r' ) msg.resize(msg.size()-1); s << ", \"" << msg << '"'; } return s.str(); } void check_call( bool result, char const * call ) { assert(call && *call); if( !result ) { std::cerr << call << " failed.\nGetLastError:" << get_last_error_str(GetLastError()) << std::endl; exit(2); } }

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• How to prevent client from accessing JSP page

  - by Ali Bassam

  In my web application, I use the .load() function in JQuery, to load some JSP pages inside a DIV. $("#myDiv").load("chat.jsp"); In chat.jsp, no Java codes is executed unless this client has Logged in, means, I check the session. String sessionId = session.getAttribute("SessionId"); if(sessionId.equals("100")){ //execute codes }else{ //redirect to log in page } Those java codes that will be executed, they will out.println(); some HTML elements. I don't want the client to write /chat.jsp in the browser to access this page, as it will look bad, and the other stuff in the main page won't be there, and this could do a harm to the web app security. How can I restrict someone from accessing chat.jsp directly, but yet keep it accessible via .load() ? UPDATE: JavaDB is a class that I made, it connects me to the Database. This is chat.jsp <body> <% String userId = session.getAttribute("SessionId").toString(); if (userId != null) { String roomId = request.getParameter("roomId"); String lastMessageId = request.getParameter("lastMessageId"); JavaDB myJavaDB = new JavaDB(); myJavaDB.Connect("Chat", "chat", "chat"); Connection conn = myJavaDB.getMyConnection(); Statement stmt = conn.createStatement(); String lastId = ""; int fi = 0; ResultSet rset = stmt.executeQuery("select message,message_id,first_name,last_name from users u,messages m where u.user_id=m.user_id and m.message_id>" + lastMessageId + " and room_id=" + roomId + " order by m.message_id asc"); while (rset.next()) { fi = 1; lastId = rset.getString(2); %> <div class="message"> <div class="messageSender"> <%=rset.getString(3) + " " + rset.getString(4)%> </div> <div class="messageContents"> <%=rset.getString(1)%> </div> </div> <% } %> <div class="lastId"> <% if (fi == 1) {%> <%=lastId%> <% } else {%> <%=lastMessageId%> <% }%></div> <% if (fi == 1) {%> <div class="messages"> </div> <% } } else { response.sendRedirect("index.jsp"); }%> </body> Guys I don't know what Filter means. UPDATE If I decided to send a parameter that tells me that this request came from Jquery. .load("chat.jsp",{ jquery : "yes" }); And then check it in chat.jsp String yesOrNo = request.getParameter("jquery"); Then they can simply hack this by using this URL. /chat.jsp?jquer=yes or something like that.. UPDATE I tried Maksim's advice, I got this when I tried to access chat.jsp. Is this the desired effect?

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• Bewildering SegFault involving STL sort algorithm.

  - by just_wes

  Hello everybody, I am completely perplexed at a seg fault that I seem to be creating. I have: vector<unsigned int> words; and global variable string input; I define my custom compare function: bool wordncompare(unsigned int f, unsigned int s) { int n = k; while (((f < input.size()) && (s < input.size())) && (input[f] == input[s])) { if ((input[f] == ' ') && (--n == 0)) { return false; } f++; s++; } return true; } When I run the code: sort(words.begin(), words.end()); The program exits smoothly. However, when I run the code: sort(words.begin(), words.end(), wordncompare); I generate a SegFault deep within the STL. The GDB back-trace code looks like this: #0 0x00007ffff7b79893 in std::string::size() const () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/libstdc++.so.6 #1 0x0000000000400f3f in wordncompare (f=90, s=0) at text_gen2.cpp:40 #2 0x000000000040188d in std::__unguarded_linear_insert<__gnu_cxx::__normal_iterator<unsigned int*, std::vector<unsigned int, std::allocator<unsigned int> > >, unsigned int, bool (*)(unsigned int, unsigned int)> (__last=..., __val=90, __comp=0x400edc <wordncompare(unsigned int, unsigned int)>) at /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:1735 #3 0x00000000004018df in std::__unguarded_insertion_sort<__gnu_cxx::__normal_iterator<unsigned int*, std::vector<unsigned int, std::allocator<unsigned int> > >, bool (*)(unsigned int, unsigned int)> (__first=..., __last=..., __comp=0x400edc <wordncompare(unsigned int, unsigned int)>) at /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:1812 #4 0x0000000000402562 in std::__final_insertion_sort<__gnu_cxx::__normal_iterator<unsigned int*, std::vector<unsigned int, std::allocator<unsigned int> > >, bool (*)(unsigned int, unsigned int)> (__first=..., __last=..., __comp=0x400edc <wordncompare(unsigned int, unsigned int)>) at /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:1845 #5 0x0000000000402c20 in std::sort<__gnu_cxx::__normal_iterator<unsigned int*, std::vector<unsigned int, std::allocator<unsigned int> > >, bool (*)(unsigned int, unsigned int)> (__first=..., __last=..., __comp=0x400edc <wordncompare(unsigned int, unsigned int)>) at /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_algo.h:4822 #6 0x00000000004012d2 in main (argc=1, args=0x7fffffffe0b8) at text_gen2.cpp:70 I have similar code in another program, but in that program I am using a vector instead of vector. For the life of me I can't figure out what I'm doing wrong. Thanks!

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• I can't upload mp3 files using Codeigniter

  - by Drew

  There are lots of suggested fixes for this but none of them work for me. I have tried making the upload class (using the following methods: http://codeigniter.com/forums/viewthread/148605/ and http://codeigniter.com/forums/viewthread/125441/). When i try to upload an mp3 i get the error message "The filetype you are attempting to upload is not allowed". Below is my code for my model and my form (i've got a very skinny controller). If someone could help me out with this I would be eternally grateful. --Model-- function do_upload() { $soundfig['upload_path'] = './uploads/nav'; $soundfig['allowed_types'] = 'mp3'; $this->load->library('upload', $soundfig); if ( ! $this->upload->do_upload()) { $error = array('error' => $this->upload->display_errors()); return $error; } else { /* $data = $this->upload->data('userfile'); */ $sound = $this->upload->data(); /* $full_path = 'uploads/nav/' . $data['file_name']; */ $sound_path = 'uploads/nav/' . $sound['file_name']; if($this->input->post('active') == '1'){ $active = '1'; }else{ $active = '0'; } $spam = array( /* 'image_url' => $full_path, */ 'sound' => $sound_path, 'active' => $active, 'url' => $this->input->post('url') ); $id = $this->input->post('id'); $this->db->where('id', $id); $this->db->update('NavItemData', $spam); return true; } } --View - Form-- <?php echo form_open_multipart('upload/do_upload');?> <?php if(isset($buttons)) : foreach($buttons as $row) : ?> <h2><?php echo $row->name; ?></h2> <!-- <input type="file" name="userfile" size="20" /><br /> --> <input type="file" name="userfile" size="20" /> <input type="hidden" name="oldfile" value="<?php echo $row->image_url; ?>" /> <input type="hidden" name="id" value="<?php echo $row->id; ?>" /> <br /><br /> <label>Url: </label><input type="text" name="url" value="<?php echo $row->url; ?>" /><br /> <input type="checkbox" name="active" value="1" <?php if($row->active == '1') { echo 'checked'; } ?> /><br /><br /> <input type="submit" value="submit" /> </form> <?php endforeach; ?> <?php endif; ?>

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