169 Archived Topics
Remove Filter  | Hello, I am having a bit of an issue with my networking addition to my game engine. The engine uses SDL to provide an event-driven programming environment. I tried adding networking functionality, but it doesn't seem to work. Here is the relevant code: //includes #if defined(_WIN32) #include <winsock2.h> typedef int … |
| | Hello, I am working on a moderately large web development system and have been charged with developing the server-side application for the web site. As a primarily local developer I have by far the most experience in C/C++. My favourite language is Ada, just to give you a sense of … |
| | Hi. I am familiar with the following C graphics libraries: Cairo, SDL, SDL2, and OpenGL. The problem I have found with these is that they either require shared libraries (Cairo/SDL/SDL2) or are difficult to make cross-platform (OpenGL). I am wondering if there are any graphics libraries for C that do …  |
| | Hello, I recently wrote a program that I wish to be portable (IE: no installer, just raw files). I have made an icon for the program and can attach it to a shortcut, but not to the executable itself (it stays as the default). On top of that I have …  |
| | Hello, I posted on this forum two times before about a particular pair of non-printing characters being inserted into my code. You can find the threads [here](https://www.daniweb.com/software-development/threads/441611/stray-non-printing-characters-in-my-programs) and [here](https://www.daniweb.com/software-development/cpp/threads/450296/arbitrarily-appearing-non-printing-character). Two great posters tried their best to solve this problem (mike_2000_17 and deceptikon) to no avail. Finally, using the hints that … |
| | Hello, I used to use Code::blocks and eclipse for code editing, but started to find them slow. I started searching for lightweight IDE's and found that the prevailing opinion is that if you are looking for lightweight code creation you should use vim/emacs, gcc and the other gnu utilities. I …  |
| | Hello, I have an issue with a plain TeX document I am writing. I need to compile drawings as well as images into pdfs. I know how to get images into a pdf using \pdfximage which works if I compile with pdfTeX. I also know how to get drawings into … |
| | Hello, I have a USB key on which I do all of my programming. It is formatted as an NTFS drive with 32 gigabytes of space. On this drive I have large C::B projects which contain both windows and linux executables. When I try to run the linux executables it …  |
| | Hello, I have a bug in my program somewhere and I cannot understand why. The program merely prints data from a binary file. Here is the code: #include <iostream> #include <fstream> #include <vector> #include <cstdint> using namespace std; int main(int argc, char *argv[]) { if (argc!=2) { cout<<"Invalid argument count, … |
| | Hello, I have learnt a few assembly languages (MIPS/x86/ARM/MIX) and I have a question about the call stack. Each of those languages uses a different method for subroutine linkage, and the way I learnt them was not conducive to recursion. Granted, if I continue reading my copy of The Art … |
| | Hello, I recently took a course on assembler/compiler construction. In it we covered parsing algorithms such as LL(n), LR(n), LALR(n), and SLR(n). I understand how these parsing algorithms can be used to determine **if** an input string follows a context free grammar (CFG). At some point I also understood how … |
| | Hello, I was recently looking through some of my code and found what I believe to be a memory leak. It is in a function that appends two strings and I am not sure how to resolve it. Here is the function: const char *strapp(const char *str,const char *s) { … |
| | Hello, I feel like this is probably something silly, but for some reason if I declare a variable at a certain point in my code, then never use it... it crashes. This is literally what happens: //... code here int isBuf=0;//one of my variables int zeroAddr=0;//<-- another variable I want, … |
| | Hello, Looking at the standard streams provided by the stl libraries, it seems as though it is impossible to have 1 stream to use for both standard console IO and file/string IO. However, before I give up I would like to ask, is this possible: generic_stream stream; stream=cin; //now I … |
| | Hello, I have a `HWND` for a window. I have double checked that it is a 100% valid window by using `SetActiveWindow()`, `SetFocus()`, and `SetForegroundWindow()` on it, successfully bringing it to the frontmost window. However whenever I try to use `GetPixel` on it it returns -1 (0xFFFFFFFF). What am I … |
| | Hello, I have a file which I need to read which contains some unusual characters (EG: 'â• ') and I need to be able to read it and convert those characters to numbers. As an example of what I am looking for would be code that reads a file and prints … |
| | Hello, I wrote a library for arbitrary precision arithmetic recently and spent a long time implementing efficient multiplication algorithms. Now I am looking to see if it is possible for me to optimize anywhere else. One place that I thought should be more optimizeable is my division algorithm. Right now … |
| | Hello, I have a particular set up of cast operators and constructors which is leading to a compile-time ambiguity error. I am wondering if somebody can explain why this is happening and what can be done to fix it. For example, here we have 2 classes: class A { int … |
| | Hello, I have a quick question about c/c++ syntax. Basically I am wondering when it is allowable to have numbers in identifiers. My compiler happens to allow numbers in: * Function names * Class names * Variable names * Pre-processor names As long as they do not begin with numbers. … |
| | I need to know which of these three copies of code is considered best. I also need to which one is more efficient memory wise and which is more efficient time wise. Thanks: enums [CODE]enum MyEnum{EnumTypeOne=1,EnumTypeTwo=2,EnumTypeThree=4,EnumTypeFour=8};[/CODE] macros [CODE]#define EnumTypeOne 1 #define EnumTypeTwo 2 #define EnumTypeThree 4 #define EnumTypeFour 8 typedef …  |
| | Hello, I have used taylor polynomials to approximate floating-point values before. I am wondering whether there is a way to still apply them to functions with complex arguments, and if there is a way what its constraints would be. For example, to calculate the sine of a floating-point number to …  |
| | Hello, I can get OpenGL to render 3D scenes to the screen, but I want to render them to a pixel array. Basically I want some magical code to fill in the blanks for this code segment: int width=500; int height=500; uint32_t *colours=new uint32_t[width*height]; //Magic code! glBegin(GL_TRIANGLES); //other drawing stuff, … |
| | Hello, Unfortunately I learnt OpenGL from NeHe tutorials, which means that all of my current methods for OpenGL-ing are extremely deprecated. I tried to find a more up-to-date tutorial, but all they seem to do is teach how to get really complicated stuff out of OpenGL. I just want to … |
| | Hello, I am working on an event driven library and am having one minor problem. Basically I have two ways to get what I want done. Method 1: Smart pointers and factory functions #include <iostream> #include <vector> #include <memory> using namespace std; class Object { public: virtual int getInt(){return 0;} … |
| | Hello, I am having a particularly nasty case of "What is the syntax?" while working on an event driven library. Basically this is what I want: class Object {// private: public: virtual bool onEvent(Event e)=0;//all objects have to react to events Object operator|(const Object &o) { // I want to … |
| | Hello, I am wondering how libraries create graphics contexts in a cross-platform manner. Somehow libraries like SDL create graphical windows seemingly without using the system headers. I know how to set up a window for graphics using Win32API, and how to get input from it using the same. How do … |
| | Hello, I noticed that in c++ everything that can be done using a static function in a class could be done by using a public function in the same namespace. Assuming that you bind your classes in a namespace these functions do not take up names in the global namespace. … |
| | This is more of a tale of "I think I broke it". Basically as an assignment for CS I have to write an assembler for a subset of the MIPS assembly language. Currently it is not working, getting a sigseg, so I decided to debug the code and step through …  |
| | Hello, I have a chain of inherited classes like this: class A { protected: int a; public: int getA(){return a;} }; class B:public A { protected: int b; public: int getB(){return b;} }; Based on that you can see that the public can only read the values in those classes, … |
| | Hello, I was just noticing that the 'const'ness of references often causes me to rewrite a large chunk of my code with pointers. For example if I have a class that needs access to a large amount of data from another class I would love to use a reference. However … |
| | Hello, I am about to move to a new home (with better internet) and I was thinking of buying a liquid cooling system so I can overclock my CPU and GPU(AMD FX-6100 Hex-Core and NVIDIA GeForce GTX 560 Ti respectiveley). I just do not really understand how liquid cooling works. …  |
| | Hello, First of all some background. My friend and I are having a bit of a competition over theoretically infinite number storage. We have agreed that the first person with a working arbitrary precision integer library with the theoretical ability to store an infinitely large number (IE: if the hard … |
| | Hello, As may be apparent from my previous posts, I am in a "If its worth doing, its worth overdoing" sort of competition with a friend of mine. Our goal is arbitrary precision integer arithmetic. I think I am close to getting the data storage working, but now I want … |
| | I have a program using old data for a game I play to indicate which pixels correspond to the health bar in my game. (my program just loops until a button is clicked and presses a key if the health bar drops too low). Unfortunately the health bar has moved … |
| | Hello, I made an arbitrary precision integer library a few weeks ago. It works well, but is bounded by `256^(8*sizeof(size_t))` because it uses a simple dynamically allocated array to do its work. I want some way to have theoretically unbounded storage. I think that file io is probably best, but … |
| | I quickly threw together a drawing program in SDL and I am having a couple of issues with lag. The program lags really hard when the size is larger than about 700x700 pixels, and I cannot find anything other than a couple of SDL_BlitSurface calls to the 'image' surface in … |
| | Hello. I am wondering how EOFs are indicated to either the cstdio functions or the fstream functions. Mainly I am wondering how it differentiates it from data. For example, if EOF is a 2-byte code wouldn't this break the system by inserting a 'false' eof flag: for (int i=0; i<256; … |
| | Hello, I am working on making myself a digital clock (as a fun little project) and I want to have two buttons, one to increase a value (like the hour) and one to decrease, mainly because I am tired of the clocks where you have to button mash the 'increase' … |
| | Hello, I am very familiar with most of the sorting algorithms that are taught in first year university (as I just finished my first year in software engineering at the University of Waterloo). As such my current go-to sorting algorithms are insertion (on mostly pre-sorted data, or data where I … |
| | Hello. I read about the daniweb api competition thing and I have an idea of what I want to create. I have never done anything webby before (aside from using dreamweaver to make websites) and I think its about time that I did! I am hoping that it is possible … |
| | Hello, I only have a basic knowledge of ASM because every tutorial I have found (including Narue's) is based on using some kind of high level library or another. However when I look through disassemblies of pretty much any program I notice that all such library calls are gone. My … |
| | Hello, I am making a number of libraries to help me with my projects and I am torn between two approaches. I will show you what each looks like. I have no idea which would be considered 'better' in general. Locals: #ifndef SOME_GUARD #define SOME_GUARD VERSION_NUMBER #ifdef __cplusplus extern "C" … |
| | Hello. I have been looking long and hard for an image library that meets these criteria that I have for pretty much any library I will use (with some obvious exceptions): A) Cross-Platform (If at all possible) B) Weightless (or nearly weightless) C) Stand-alone (I hate having to include DLLs … |
| | Hello. As a Software Engineer I admit a slight lack of knowledge with hardware. I am usually quite good with any hardware that is contained within the case, my issues lie in networking. Usually I fix my own computer problems, but now I have a couple networking problems that I … |
| | Hello. I was reading http://xkcd.com/287/ while bored and thus decided to write a program that would solve such np complete problems. Here is what I got: #include <iostream> #include <vector> using namespace std; template <typename T> T NPMenuProblem(T desired, vector<T> options, vector<T> &ret) { vector<T> save=ret; T remainder; T min=desired; … |
| | Hello, I am making a program that deals with bitmap files and I want to try to load bitmap data manually. The issue is that I cannot find a good resource for exactly what bitmap files can contain. [Wikipedia](http://en.wikipedia.org/wiki/BMP_file_format) has a decent article, but it is missing some important information. … |
| | Ok, so occassionally as I write my code, a non-printing character is insterted... according to code::blocks this character is actually two characters (\302 and \206). I have done much searching to solve the problem, but a solution has eluded me. I tried using the windows console type command on a … |
| | Hello, I am working on an arbitrary precision arithmetic library. I already created a version that just stored numbers as "before decimal point [unsigned array]" and "after decimal point [unsigned array]". The issue is that it is both inefficient and incomplete. I would like to incorporate complex numbers into the …  |
| | Hello, I was partaking in the global game jam (where you have to try to make a game in 48 hours). I got my game pseudo-finished, but I cannot get it to render the scene properly. Here is the code related to the rendering: Code for opengl initialization: glClearColor(0.5f,0.5f,0.5f,1.0f); float … |
| | Hello, I am using Code::Blocks, and recently any time I try to compile any program I get the errors "stray '\302' in program" and "stray '\206' in program" about every 20-30 lines. I know how to fix these (by deleting the non printing character(s) in the line in question) but … |
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