Hi, I'm implementing a custom combobox to behave like a searchbox. It is constructed from an Edit control, a Button and a Listbox. I'm trying to open the listbox on mouse click on the button, it seemed to be simple but become complicated. First I tried to manage the mouse click on the "BN_CLICKED", but then I discovered it's too late a...
Hi all, i have small doubt regarding the window functions in c++. what exactly "invalidate()" function do? what message does it sends?when we need to call this? also what is "update()" function? is "invalidaterect()" works similar to "invalidate()" function?. Thanks ...
Hi Guys, Is it OK/possible to have a shared memory in a COM object which will be consumed by applications built using C# and/or C++? Can C# access shared memory in COM object without crash? Thanks, Adi Barda ...
class linklist4x4 { private: struct node4x4 { double data[4][4]; node4x4 *link; }*p; public: linklist4x4(); void append( double* num ); void add_as_first( double* num ); void addafter( int c, double* num ); //void del( double* num ); void display(); int count(); double*...
I am trying to write a graphics application in C++. It currently uses OGRE for display, but I'd like it to work with Irrlicht or any other engine, even a custom rendering engine which supports my needs. This is a rather long question, so I'd appreciate help on re-tagging/ cleanup (if necessary). I'll start with a little background. ...
How can I detect when a removable disk drive is (dis)connected to the system? How to get the mount path (for Linux) and the drive letter (for windows)? EDIT: Is there a way to detect the currently connected devices? ...
I am using Turbo C++ 3.0 Compiler While using the following code .. char *Name; cin >> Name; cout << Name; When I gave input with space ... its only saving characters typed before space .. like if I gave input "QWERT YUIOP" ... Name will contain "QWERT"; Any explaination why ?? ...
Recently one of my friend asked me how to prevent class inheritance in C++. He wanted the compilation to fail. I was thinking about it and found 3 answers. Not sure which is the best one. 1) Private Constructor(s) class CBase { public: static CBase* CreateInstance() { CBase* b1 = new CBase(); return b1; } private: CBase(...
struct tagEnumdef{}; struct tagName{}; struct tagWidget{}; template< class type > class ParamTags; template<> class ParamTags<int> { public: typedef tagEnumdef tag; }; template<> class ParamTags<QString> { public: typedef tagName tag; }; template<> class ParamTags<QWidget*>{ public: typedef tagWidget tag; }; typedef boost::multi...
Hi, I was provided this simple C++ [I think] program to investigate the maximum size of int that can be stored: #include <limits.h> #include <iostream> void main ( int argc , char * argv[]) { cout << "INT_MAX " << INT_MAX << endl ; cout << "INT_MAX +1 = " << INT_MAX + 1 << endl ; cout << "INT_MAX -1 = " << INT_MAX - 1 ...
gph is a singleton class with no getInstance method class gph { public: static void newfun(); static void newfun1(); //...// private: gph(); }; This class gets build into a static library Now I have a Dll from where I need to access the static function . So class A is a part of a Dll I have a C++ member function say ...
Hi guys, My col is planning to conduct a online coding competition.. Im now looking for a framework that checkes user's code and returns the appropriate result.. Only C,C++ support is enough.. -Dinesh ...
Hi guys, I'm going to make my application extensible. Where I can read information about writing programs which support plugins? C++ ...
Hi, I am writing a C++ program which needs to create a temporary file for its internal usage. I would like to allow concurrent executions of the program by running multiple proccesses, so the temporary file name needs to be randomized, that way each spawned process will generate a unique temporary file name for its own use. I am using r...
Hi, guys! I have written cpp aplication called MyShell that takes as the params some real shell name (generally bash) and its params. MyShell works as a wrapper for it. I need to change command prompting for the inner shell, specifically the PS1 environmental variable. I know how to do it command-line way using PS1 env var: $ PS1="[m...
Hi, I know how to do an opaque object in C++ as following: // my_class.hpp class opaque_object; class my_class { my_class(); ~my_class(); opaque_object *m_opaque_object; }; // my_class.cpp #include <my_class.hpp> class opaque_object { // ... }; my_class::my_class() { m_opaque_object = new opaque_object(); } my_class::~...
Hi, I wonder if there is something like eps to represent the value of machine precision in C++? Can I use it as the smallest positive number that a double can represent? Is it possible to use 1.0/eps as the max positive number that a double can represent? Where can I find eps in both C++ and C standard libraries? Thanks and regards! ...
Hi, I'm a programming student in my first C++ class, and for a recent project I did, I was unable to create an array of strings like I could do in C#: string MONTHS[ARRAY_CAPACITY] = { "Jan", "Feb", "Mar", "April", "May", "June", "July", "Aug", "Sep", "Oct", "Nov", "Dec" }; // this yields many compiler errors in C++ Is it possible to...
I have been using std::string in my code. I was going to make a std::string and pass it by reference. However, someone suggested using a char * instead. Something about std::string is not reliable when porting code. Is that true? I have avoided using char * as I would need to do some memory management for it. Instead I find using the std...
I was recently interviewing for a C++ position, and I was asked how I guard against creating memory leaks. I know I didn't give a satisfactory answer to that question, so I'm throwing it to you guys. What are the best ways to guard against memory leaks? Thanks! ...