I am looking into developing a small (read:rudimentary) web server on a linux platform and I have no idea where to start. What I want it to be able to do is: Listen on a specific port Take HTTP post and get requests Respond appropriately No session management required Has to be in C or C++ Has to run as a service on boot I am famili...
How do I protect /etc/passwd and /etc/shadow from concurrent access? I don't see any locking mechanism in pwd.h. I see the manual for pwd_mkdb mentions obtaining a lock, but is it just locking the file for exclusive access? Is there a convention for locking these files if I were to write a utility to modify them directly, or through t...
I have data in the following format: 4:How do you do? 10:Happy birthday 1:Purple monkey dishwasher 200:The Ancestral Territorial Imperatives of the Trumpeter Swan The number can be anywhere from 1 to 999, and the string is at most 255 characters long. I'm new to C++ and it seems a few sources recommend extracting formatted data with ...
The full error I'm getting is this: error: ambiguous overload for ‘operator[]’ in ‘a[boost::_bi::storage4<A1, A2, A3, boost::arg<I> >::a4_ [with A1 = boost::_bi::value<MsgProxy*>, A2 = boost::arg<1>, A3 = boost::arg<2>, int I = 3]]’ It references line 116 of a class I have, which is the boost::bind call in this function: // Dis...
According to my memory the following piece of code should compile fine on C++ but not in C. Only problem is how to test it? It compiled fine with g++ and also with gcc. I'm assuming that g++ is C++ compiler and gcc is C compiler. I've tried it with mingw under Windows. Am I correct? if not then how to compile it using C compiler. int ma...
I noticed while making a program that a lot of my int type variables never went above ten. I figure that because an int is 2 bytes at the shortest (1 if you count char), so I should be able to store 4 unsigned ints with a max value of 15 in a short int, and I know I can access each one individually using >> and <<: short unsigned int S...
// I prefer to perform forward declaration on myclass, as I do not // wish to ship "myclass.h" to client // However, the following code doesn't allow me to do so, as class defination // is needed in header file. // // a.h #include "myclass.h" class a { public: a(); myclass me; }; I try to do it another way around. However, I ...
I try to forward declare concurrent_bounded_queue ; class MyClass { namespace tbb { template<typename T> class cache_aligned_allocator; template<class T, class A = cache_aligned_allocator> class concurrent_bounded_queue; }; // I wish to maintain this syntax. tbb::concurrent_bounded_queue<std::string>& co...
Why can't I compile the program 1 when the the program 2 is working fine ? Why is it's behavior different? Program 1: #include <iostream> typedef int s1; typedef int s2; void print(s1 a){ std::cout << "s1\n"; } void print(s2 a){ std::cout << "s2\n"; } int main() { s1 a; s2 b; print(a); print(b); ...
Over the years I've developed a small mass of C++ server/client applications for Windows using WinSock (Routers, Web/Mail/FTP Servers, etc... etc...). I’m starting to think more and more of creating an IPv6 version of these applications (While maintaining the original IPv4 version as well, of course). Questions: What pitfalls might I...
I'm trying to launch a Java app from a C++ app using the following code: #include <windows.h> #include <memory.h> #include <tchar.h> int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { STARTUPINFOW siStartupInfo; PROCESS_INFORMATION piProcessInfo; memset(&siStartupI...
Can someone describe what advantages a C or C++ programmer would have over a .Net programming when developing for Windows? ...
Given P1 and P2, how can I get the angle from P1 to P2? Thanks ...
hi I am trying to visualize a music file in gstreamer using the following command: gst-launch filesrc location=file.mp3 ! decodebin ! audioconvert ! tee name=myT myT. ! queue ! autoaudiosink myT. ! queue ! goom ! colorspace ! autovideosink But I get this error : "There may be a timestamping problem, or this computer is too slow." P...
Hello, I am a fairly new software developer currently working adding unit tests to an existing C++ project that started years ago. Due to a non-technical reason, I'm not allowed to modify any existing code. The base class of all my modules has a bunch of methods for Setting/Getting data and communicating with other modules. Since I ju...
I'm writing a lambda calculus interpreter for fun and practice. I got iostreams to properly tokenize identifiers by adding a ctype facet which defines punctuation as whitespace: struct token_ctype : ctype<char> { mask t[ table_size ]; token_ctype() : ctype<char>( t ) { for ( size_t tx = 0; tx < table_size; ++ tx ) { t[tx] = isal...
.dylib is the dynamic library extension on OSX, but it's never been clear to me when I can't / shouldn't use a traditional unix .so shared object. Some of the questions I have: At a conceptual level, what are the main differences between .so and .dylib? When can/should I use one over the other? Compilation tricks & tips (For example,...
Is there an easier way to do it than this, and if this is the only way, are there any potential memory leaks here? CImage img1; int dimx = 100, dimy = 100; img1.Load(filename); //filename = path on local system to the bitmap CDC *screenDC = GetDC(); CDC *pMDC = new CDC; pMDC->CreateCompatibleDC(scree...
The following code works fine for Visual C++ 2008. However, when comes to Visual C++ 6, I get the following error. May I know why, and how I can fix the error, but still make the destructor remains in private. class X { public: static X& instance() { static X database; return database; } private: X() {}...
I'm using ESE (JetBlue) in an app, when JetAttachDatabase is called it returns JET_errDatabaseDirtyShutdown. What am I supposed to do in my app? my desire is for any uncommeted transactions to be deleted ...