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• Installed Perl DBI Module Can't Be Found

  - by Russell C.

  I'm trying to setup a Perl development environment on my Mac laptop and have been having a really hard time getting it working. I thought I had everything configured correctly but when I try to run a sample script it is reporting errors with the DBI module and can't access the DB. Here is what is reported in the Apache error logs: [Fri Apr 30…

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• Overloading the QDataStream << and >> operators for a user-defined type

  - by Alex Wood

  I have a an object I'd like to be able to read and write to/from a QDataStream. The header is as follows: class Compound { public: Compound(QString, QPixmap*, Ui::MainWindow*); void saveCurrentInfo(); void restoreSavedInfo(QGraphicsScene*); void setImage(QPixmap*); QString getName(); private: QString name, homeNotes,…

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• Reference-type conversion operators: asking for trouble?

  - by Ben

  When I compile the following code using g++ class A {}; void foo(A&) {} int main() { foo(A()); return 0; } I get the following error messages: > g++ test.cpp -o test test.cpp: In function ‘int main()’: test.cpp:10: error: invalid initialization of non-const reference of type ‘A&’ from a temporary of type ‘A’…

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• Declaring functors for comparison ??

  - by Mr.Gando

  Hello, I have seen other people questions but found none that applied to what I'm trying to achieve here. I'm trying to sort Entities via my EntityManager class using std::sort and a std::vector<Entity *> /*Entity.h*/ class Entity { public: float x,y; }; struct compareByX{ bool operator()(const GameEntity &a, const…

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• Understanding evaluation of expressions containing '++' and '->' operators in C.

  - by Leif Ericson

  Consider this example: struct { int num; } s, *ps; s.num = 0; ps = &s; ++ps->num; printf("%d", s.num); /* Prints 1 */ It prints 1. So I understand that it is because according to operators precedence, -> is higher than ++, so the value ps->num (which is 0) is firstly fetched and then the ++ operator…

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• Swig C++ Lua Pass class by reference

  - by Jeremy

  I don't know why I'm having a hard time with this. All I want to do is this: class foo { public: foo(){} ~foo(){} float a,b; }; class foo2 { public: foo2(){} foo2(const foo &f){*this = f;} ~foo2(){} void operator=(const foo& f){ x = f.a; y = f.b; } …

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• Module Adminhtml blocks not loading

  - by David Tay

  I was working on a Magento module and it was working fine. At some point, I was trying to enable WYSIWYG in an edit form 'content' field and suddenly, my adminhtml grid and edit blocks stopped being generated. On my system are TinyMCE and Fontis FCKEditor WYSIWYG editors extensions. I'm not sure what I did wrong but my…

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• Automatically converting an A* into a B*

  - by Xavier Nodet

  Hi, Suppose I'm given a class A. I would like to wrap pointers to it into a small class B, some kind of smart pointer, with the constraint that a B* is automatically converted to an A* so that I don't need to rewrite the code that already uses A*. I would therefore want to modify B so that the following compiles...…

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• Make conversion to a native type explicit in C++

  - by Tal Pressman

  I'm trying to write a class that implements 64-bit ints for a compiler that doesn't support long long, to be used in existing code. Basically, I should be able to have a typedef somewhere that selects whether I want to use long long or my class, and everything else should compile and work. So, I obviously need…

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• Is it possible to implement events in C++?

  - by acidzombie24

  I wanted to implement a C# event in C++ just to see if i could do it. I got stuck, i know the bottom is wrong but what i realize my biggest problem is... How do i overload the () operator to be whatever is in T in this case int func(float)? I cant? can i? Can i implement a good alternative? #include…

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• What does the `new` keyword do

  - by Mike

  I'm following a Java tutorial online, trying to learn the language, and it's bouncing between two semantics for using arrays. long results[] = new long[3]; results[0] = 1; results[1] = 2; results[2] = 3; and: long results[] = {1, 2, 3}; The tutorial never really mentioned why it switched back…

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• Is there a better way to organize my module tests that avoids an explosion of new source files?

  - by luser droog

  I've got a neat (so I thought) way of having each of my modules produce a unit-test executable if compiled with the -DTESTMODULE flag. This flag guards a main() function that can access all static data and functions in the module, without #including a C file. From the README: -- Modules -- The…

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• fatal error LNK1112: module machine type 'X86' conflicts with target machine type 'AMD64'

  - by KK

  Hi, I am using VS 2003 .Net on 32 bit XP OS. I have also installed "Microsoft Platform SDK" on my machine. Can I build vc++ application (binaries) targeted for 64 bit OS? I am using following project options : Name="VCLinkerTool" AdditionalOptions="/machine:AMD64 bufferoverflowU.lib" …

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• Terminology: Difference between software interface, software component, software unit, software modu

  - by JamieH

  I see these terms used quite a lot between various authors, but I can't seem to fix upon definitive definitions. From my POV a software interface is a "type" specifying the way in which a software component may be used by other softare components. But what exactly a software component is I'm…

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• How to keep asm output from Linux kernel module build

  - by fastmonkeywheels

  I'm working on a Linux kernel module for a 2.6.x kernel and I need to view the assembly output, though it's currently being done as a temporary file an deleted afterwords. I'd like to have the assembly output mixed with my C source file so I can easily trace where my problem lies. This is for…

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• Kohana 3: Auth module

  - by Thomas

  Hi, i'm trying to learn the Kohana's Auth module but login method always return false. Controller: <?php defined('SYSPATH') OR die('No Direct Script Access'); class Controller_Auth extends Controller { public function action_index() { if($_POST) { $this->login();…

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• Reading custom values in Ebay RSS feed (XML::RSS module)

  - by munster

  I've spent entirely way too long trying to figure this out. I'm using XML:RSS and Perl to read / parse an Ebay RSS feed. Within the area, I see these entries: 1395 1255 However, I can't figure out how to grab the details during the loop. I wrote a regex to grab them: @current_price =…

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• Object/Module not found: RDS from VB6 app to a Win2003 server

  - by Cyberherbalist

  I have a rather legacy application EXE written in VB6 and running on a Windows 2000 server that uses RDS (Remote Data Services) to access a business object DLL (also written in VB6) running on a Windows 2003 server. The DLL has never run on this server (we're moving the component off the…

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• Creating Python C module from Fortran sources on Ubuntu 10.04 LTS

  - by Botondus

  In a project I work on we use a Python C module compiled from Fortran with f2py. I've had no issues building it on Windows 7 32bit (using mingw32) and on the servers it's built on 32bit Linux. But I've recently installed Ubuntu 10.04 LTS 64bit on my laptop that I use for development, and…

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• "from _json import..." - python

  - by RoseOfJericho

  Hello, all. I am inspecting the JSON module of python 3.1, and am currently in /Lib/json/scanner.py. At the top of the file is the following line: from _json import make_scanner as c_make_scanner There are five .py files in the module's directory: __init__ (two leading and trailing…

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• Module import error using IDLE

  - by Nimbuz

  I'm an absolute beginner using IDLE (Python 2.6.4) to learn the basics. I recently found a Python program that I want to run but it throws an error although the code looks fine (i.e all modules exist): from css.parse import parse data = """ em { padding: 2px; margin:…

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• ISO C90 forbids mixed declarations and code Warning [Kernel Module Makefile]

  - by djTeller

  Hi, I'm trying to compile a linux kernel module using a Makefile which looks like so: obj-m += main.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean and i'm getting the following…

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• Significant figures in the decimal module

  - by Jason Baker

  So I've decided to try to solve my physics homework by writing some python scripts to solve problems for me. One problem that I'm running into is that significant figures don't always seem to come out properly. For example this handles significant figures properly: from…

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• pb with callback in the python optparse module

  - by PierrOz

  Hi Guys, I'm playing with Python 2.6 and its optparse module. I would like to convert one of my arguments to a datetime through a callback but it fails. Here is the code: def parsedate(option, opt_str, value, parser): option.date = datetime.strptime(value,…

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• Documenting module/class/function bodies in python sphinx docs

  - by perrierism

  Is there a way with Sphinx documentation to output a function or class body (the code itself) with the autodoc feature? I'm using autodoc to much success. In addition to the docstrings getting pulled in to the documentation I want like a link to click for each…

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