Hi, I'm looking for a copy of either Borland C++ v3 or Turbo C++ which can run on DOS, but my searches are turning up a blank. I vaguely remember a free Turbo version available, but can't track it down. Are there free/pay versions of these still available? Is http://www.embarcadero.com my best hope? Thanks for any info... ...
I am trying to write 2 server/client programs under Linux, in which they communicate through named pipes. The problem is that sometimes when I try to write from the server into a pipe that doesn't exist anymore (the client has stopped), I get a "Resource temporarily unavailable" error and the server stops completely. I understand that ...
Hey guys. I'm trying to add PNG support to my application and thus I want to include libpng. I know it needs zlib and thus I downloaded that as well. I went into the png folder/projects/vstudio and I opened the solution. I compiled it and it went just fine. I added some headers from it into my application and I copied the lib files. My ...
My question is related to RTTI in C++ where I'm trying to check if an object belongs to the type hierarchy of another object. The BelongsTo() method checks this. I tried using typeid, but it throws an error and I'm not sure about any other way how I can find the target type to convert to at runtime. #include <iostream> #include <typein...
Hello, i try to make intensive use of templates to wrap a factory class: The wrapping class (i.e. classA) gets the wrapped class (i.e. classB) via an template-argument to provide 'pluggability'. Additionally i have to provide an inner-class (innerA) that inherits from the wrapped inner-class (innerB). The problem is the following erro...
Hi I Have some problems finding the right information about this and would be glad if someone could point me in the right direction. How do you code a midifile? e.g. how can I write a snippet that plays a random tone for 1 second. Basically what I would need to get done is representing differnet midi melodys as vectors of some sort? How ...
I'm currently trying to get into QT4 and figure out a workflow for myself. While trying to create a widget which allows the user to connect to a hostname:port some questions appeared. The widget itself contains a LineEdit for entering the hostname, a SpinBox for entering the port and a PushButton which should emit a connect(QString host...
My php script communicates over TCP with C server, is there a way to present data obtained from the server while it does not refresh the entire page, so the data refer to a ajax script? ...
I'm using code that treats an array of derived objects as an array of base objects. The size of both objects is the same. I'm wondering: Is this safe in practice, bearing in mind that the code will only ever be compiled on Microsoft compilers? Here's my example: BOOST_STATIC_ASSERT(sizeof(VARIANT)==sizeof(CComVariant)); //auto_arra...
Hello all, I am developing a computer vision program using OpenCV (IDE = devcpp). I am able to get the hand contour , move cursor position according to our our hand. i want to implement right click functionality .Please help me with it . i am using event SetCursorPos(x,y) to set the cursor position on the screen. is there any simple f...
I have a program I want to profile with gprof. The problem (seemingly) is that it uses sockets. So I get things like this: ::select(): Interrupted system call I hit this problem a while back, gave up, and moved on. But I would really like to be able to profile my code, using gprof if possible. What can I do? Is there a gprof opti...
Hi, When I read one char* from std::cin and I want to write it to std::cout, it prints until it finds a \0 in memory. So what did was: char c; cin >> c; char* pChar = &c; pChar++; *pChar = '\0'; println(&c); // My own method: void println(char * str) { cout << str << endl; } But I don't think this is a safe action. Is there a safer ...
I'm reading path names from a database which are stored as relative paths in Windows format, and try to create a boost::filesystem::path from them on a Unix system. What happens is that the constructor call interprets the whole string as the filename. I need the path to be converted to a correct Posix path as it will be used locally. I ...
#include <iostream> using namespace std; class Duck { public: virtual void quack() = 0; }; class BigDuck : public Duck { public: // void quack(); (uncommenting will make it compile) }; void BigDuck::quack(){ cout << "BigDuckDuck::Quack\n"; } int main() { BigDuck b; Duck *d = &b; d->quack(); } ...
I have this constant: #define MAX_DATE 2958465L What does the L mean in this sense? ...
Background: This is a follow-up question to this thread about handling EINTR for system calls in C++ (Linux/GCC). Regardless of whether or not I intend to profile my application, it seems like I should be handling system calls setting errno to EINTR as a special case. There are many, many, many opinions about the use of goto. My quest...
properties/C/C++ Build/Settings GCC C++ Linker/Libraries Under libraries(-I) I have libbost_system libbost_filesystem ... and under Library search path(-L) I have /home/etobkru/boost_1_43_0/boostBinaries/lib but when I compile I get g++ -L/home/etobkru/boost_1_43_0/boostBinaries/lib/ -o"searchDirs" ./main.o -llibboost_system -llib...
boost::operators automatically defines operators like + based on manual implementations like += which is very useful. To generate those operators for T, one inherits from boost::operators<T> as shown by the boost example: class MyInt : boost::operators<MyInt> I am familiar with the CRTP pattern, but I fail to see how it works here. Spe...
I know I could use the following: template <typename Pair> struct ComparePairThroughSecond : public std::unary_function<Pair, bool> { bool operator ()(const Pair& p1, const Pair& p2) const { return p1.second < p2.second; } }; std::set<std::pair<int, long>, ComparePairThroughSecond> somevar; but wondered if i...
I have two methods f(vector<int>& x, ....) and g(DBConn& x, ....) where the (....) parameters are all identical. The code inside the two methods are completely identical except for one statement where we do different actions based on the type of x: in f(): we do x.push_back(i) in g(): we do x.DeleteRow(i) What is the simplest way to...