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• Calling to_xml on an Array of ROXML objects results in an empty collection

  - by findchris

  Hi there. I have a ROXML object that looks like: class Activity include ROXML xml_accessor :id end If I have an array of these objects and call .to_xml on the array, I receive an empty xml collection: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<activities type=\"array\">\n</activities>\n" Any idea why or how to fix this? I'm running Rails 2.3.5 with the newest version of ROXML. Thanks

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• How to get the i get the volume GUID

  - by new

  Dear all, I am using win32 api with C++. I would like to know how I can get the volume GUID using a "device path". My device looks like this: \\?\usb#vid_04f2&pid_0111#5&39fe81e&0&2#{a5dcbf10-6530-11d2-901f-00c04fb951ed} Thanks.

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• Randomly select file in PHP

  - by user201140

  I'd like to use the 'include' keyword in php to randomly select a file from a folder and output the contents. How would I do this? Thanks.

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• Boost::binary<> [c++][Boost]

  - by atch

  Hi, Is there anything in boost libraries like binary? For example I would like to write: binary<10101> a; I'm ashamed to admit that I've tried to find it (Google, Boost) but no results. They're mention something about binary_int< but I couldn't find neither if it is available nor what header file shall I include; Thanks for help.

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• Android application files

  - by rantravee

  Hi, Is there a way to programatically get the path to the databases/files an application uses instead of hardcoding "data/data/mypackage.com/database.db" ?

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• Singleton Pattern Implementation Issues?

  - by locky28

  Hi I am revising for an exam and need to know some implementation issues with the singleton pattern. they do not need to be too complex just basic things that would affect a developers decision to include them, Thanks P.S. Could any code examples be given in Java thanks.

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• Can a trait state if a C++ class has a default constructor?

  - by Vicente Botet Escriba

  Traits classes can be defined to check if a C++ class has a member variable, function or a type (see here). Curiously, the ConceptTraits do not include traits to check if a C++ class defines a default constructor or given constructor? Can traits be used to check the constructor presence? If yes, how? If not, why it is not possible?

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• How do I use PHP to grab the name of the file?

  - by Sam

  Hi, what I want to do is PHP to look at the url and just grab the name of the file, without me needing to enter a path or anything (which would be dynamic anyway). E.G. http://google.com/info/hello.php, I want to get the 'hello' bit. Help? Thanks.

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• Take user input and write to file from javascript inside a pdf?

  - by dazedandconfused

  Is it possible to have a pdf file that asks a user a set of questions and then writes their answers to a file, then next time it is viewed loads those answers as default values? I know pdfs can include javascript and have figured out how to add javascript to a pdf with iText (http://itextpdf.com/) but don't know how to prompt for user input or write to a file from inside the pdf. Any help would be appreciated.

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• problem in Printing A Webpage

  - by moustafa

  There Is A Date Picker Code In my Program (Of Course We Placed A Calendar Picture In The Web Page) The Problem Now Is That How Can We Be Able Not To Include The Picture Of The Calendar Picture In Printing?

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• reference external javascript in mvc not working

  - by user281180

  Hi I have created an extrenal javascript and inserted the path in my site.master with other scripts. However, I can`t access the functions of the file. What can be the problem? Have I done it right, though I wanted to access it directly from my view?

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• Dynamic array of template objects in C++

  - by jaens

  #include <vector> using namespace std; int main() { vector<int> *list = new vector<int>[33]; delete[] list; return 0; } Any reason why the delete SIGSEGVs?

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• Handling macro redefinition without modifying .h files ... C / C++ language

  - by user310119

  Background: Let assume that I have two header files a.h and b.h. a.h contains: #define VAR 1 b.h contains: #define VAR 2 Note: The name of both of the macro is same. Let say I have some file myFile.c which includes both of the header files i.e. a.h and b.h. When I try to access VAR, I get a redefinition error of VAR. In order to resolve this problem, I inserted #ifndef VAR statement in both a.h and b.h files to prevent this error. a.h file becomes #ifndef VAR #define VAR 1 #endif b.h file becomes #ifndef VAR #define VAR 2 #endif Note: The header file can contain multiple macros, not just one macro. Problem: Let's assume that a.h and b.h files are obtained from third party library. These files don't contain #ifndef VAR statement. I am not allowed to change their header files. Can I resolve macro 'VAR' redefinition error in myFile.c or myFile.cpp file which uses VAR macro? I know I #undef VAR can be used to undefine a macro VAR. How can I selectively include VAR later in my program? i.e. on line 10 of myFile.c code I should be able to refer to VAR definition from a.h file, on line 15 of my code I should be able to refer to VAR from b.h file and on line 18 again I should be able to refer to VAR from a.h file. In short, am I able to do macro polymorphism ? Given a name of header file, it should refer to macro definition present in that file. I thought of using namespace trick to resolve an issue. Define first header file in namespace first and second header file in namespace second. I tried defining two namespaces. First namespace contains #include a.h and second namespace contains b.h. However, namespace trick does not work with macro. When I tried to access firstns::VAR, compiler reports an error message. Can you please suggest some way?

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• LINQ display row numbers

  - by timvaines

  I simply want to include a row number against the returned results of my query. I found the following post that describes what I am trying to achieve but gives me an exception http://vaultofthoughts.net/LINQRowNumberColumn.aspx "An expression tree may not contain an assignment operator" In MS SQL I would just use the ROWNUMBER() function, I'm simply looking for the equivalent in LINQ.

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• RegisterClientScriptInclude

  - by mrf

  i use ScriptManager.RegisterClientScriptInclude to include js file after partial postback it works fine here : ** ScriptManager.RegisterClientScriptInclude(this, typeof(test4), "1", Page.ResolveClientUrl("~/slideshow/js/slideshow.js")); ** but i want to load more than one js files so i did this ** ScriptManager.RegisterClientScriptInclude(this,typeof(test4),"one", Page.ResolveClientUrl("~/slideshow/js/slideshow.js")); ScriptManager.RegisterClientScriptInclude(this, typeof(test4), "two", Page.ResolveClientUrl("~/slideshow/js/slideImg.js")); ** with two different string keys the first one works but the second not....please any help

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• WPF, databinding

  - by fsl

  Hi there In a given binding is it possible to specify the path on the source object? Seems like this could a void a lot of trivial converters.. Imagine this..: class foo { bool A int B } <ComboBox ItemsSource="ListOfFoos" SelectedItem="{Binding number, SourcePath=B}" />

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• Is there a way (other than sql) to get the mlid for a given nid in drupal?

  - by sprugman

  I've got a node, I want it's menu. As far as I can tell, node_load doesn't include it. Obviously, it's trivial to write a query to find it based on the path node/nid, but is there a Drupal Way to do it?

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• guides for writing php libraries?

  - by fayer

  i have studied design patterns and want to use them to code an open source library (not an application). but i have never coded a library before and don't know where should i include files, should i have a bootstrap file that loads everything or should every class load their own classes they are dependent on etc. are there any tutorials for writing libraries in php from start to finnish? thanks

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• Can I upload an object in memory to FTP using Python?

  - by fsckin

  Here's what I'm doing now: mysock = urllib.urlopen('http://localhost/image.jpg') fileToSave = mysock.read() oFile = open(r"C:\image.jpg",'wb') oFile.write(fileToSave) oFile.close f=file('image.jpg','rb') ftp.storbinary('STOR '+os.path.basename('image.jpg'),f) os.remove('image.jpg') Writing files to disk and then imediately deleting them seems like extra work on the system that should be avoided. Can I upload an object in memory to FTP using Python?

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• Dynamic library Linking at execution

  - by Carl_1789

  Hi, why did it fail to load the library at link at compilation time? i don't care about freeing the library yet it just won't work. #include <windows.h> int main() { LoadLibrary("winmm.lib"); timeGetTime(); }

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• Swing application -> Drag & drop to the desktop / folder

  - by ffffff

  When Finder of Mac, Explorer of Windows did drag & drop of a specific item in the Swing application to a desktop and a folder, How to get the former path which I dropped? I am happy teach me a necessary class and method.

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• taking input then containing in string

  - by gcc

  input as; (A%v),(c+e),-p#-d //include no white space i want to hold input as A[0]=A%v A[1]=c+e A[2]=-p#-d is it possible? how?

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• How to make c++ console application not exit until user presses any key?

  - by user198729

  #include <iostream> using namespace std; int main() { cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!! return 0; } The exe generated by the above will exit automatically,how to change the behavior?

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• Need help with map (c++, STL)

  - by Mike Dooley

  Hi folks! Actually I'm new to C++. I tried something out (actually the map container) but it doesn't work the way I assumed it will... Before posting my code, I will explain it shortly. I created 3 classes: ClassA ClassDerivedA ClassAnotherDerivedA The two last ones are derived from "ClassA". Further I created a map: map<string,ClassA> test_map; I put some objects (from Type ClassDerivedA and ClassAnotherDerivedA) into the map. Keep in mind: the mapped value is from type "ClassA". This will only work because of Polymorphism. Finally I created an iterator which runs over my map and compares the user input with my keys in the map. If they match, it will call a specific method called "printOutput". And there is the Problem: Although i declared "printOutput" as "virtual" the only method called is the one from my base class, but why? and here is the code: #include <iostream> #include <map> using namespace std; class ClassA { public: virtual void printOutput() { cout << "ClassA" << endl; } }; class ClassDerivedA : public ClassA { public: void printOutput() { cout << "ClassDerivedA" << endl; } }; class ClassAnotherDerivedA: public ClassA { public: void printOutput() { cout << "ClassAnotherDerivedA" << endl; } }; int main() { ClassDerivedA class_derived_a; ClassAnotherDerivedA class_another_a; map<string,ClassA> test_map; test_map.insert(pair<string,ClassA>("deriveda", class_derived_a)); test_map.insert(pair<string,ClassA>("anothera", class_another_a)); string s; while( cin >> s ) { if( s != "quit" ) { map<string,ClassA>::iterator it = test_map.find(s); if(it != test_map.end()) it->second.printOutput(); } else break; } } Blockquote

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• how a thread can signal when it's finished?

  - by Kyle

  #include <iostream> #include <boost/thread.hpp> using std::endl; using std::cout; using namespace boost; mutex running_mutex; struct dostuff { volatile bool running; dostuff() : running(true) {} void operator()(int x) { cout << "dostuff beginning " << x << endl; this_thread::sleep(posix_time::seconds(2)); cout << "dostuff is done doing stuff" << endl; mutex::scoped_lock running_lock(running_mutex); running = false; } }; bool is_running(dostuff& doer) { mutex::scoped_lock running_lock(running_mutex); return doer.running; } int main() { cout << "Begin.." << endl; dostuff doer; thread t(doer, 4); if (is_running(doer)) cout << "Cool, it's running.\n"; this_thread::sleep(posix_time::seconds(3)); if (!is_running(doer)) cout << "Cool, it's done now.\n"; else cout << "still running? why\n"; // This happens! :( return 0; } Why is the output of the above program: Begin.. Cool, it's running. dostuff beginning 4 dostuff is done doing stuff still running? why How can dostuff correctly flag when it is done? I do not want to sit around waiting for it, I just want to be notified when it's done.

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