24 Archived Topics
Remove Filter  | A common task in C or C++ is to get a string from somewhere and convert it to an integer. "Use `atoi`" is a common suggestion from the unwashed masses, and on the surface it works like a charm: #include <stdio.h> #include <stdlib.h> long long square(int value) { return value …  |
| | I'm sure I've mentioned this type of wrapper class for accessing databases in a provider-agnostic manner before, but never posted a functional implementation. So here it is. Questions, comments, and suggestions are welcome as always. :)  |
| | If you have any ideas for a code snippet you'd like to see, please post them here. We can't depend on the snippet writers to come up with all of the ideas, can we? ;)  |
| | Howdy all. I've recently been considering doing an online meeting or webcast on certain subjects for which I have a lot of experience or knowledge. The idea being that something too long or complex for a Daniweb article can be more easily shown by sharing my desktop and talking about … |
| | *Warning: This code is tested, but not as-is. I combined multiple files to simplify the snippet.* One of my specialties is document imaging, and custom tools to handle it. A common request for both scanner sources and file import is correction of when pages are not properly oriented. To avoid … |
| | I work with images...a *lot*. Often this involves image processing of various types such as resizing, resampling, and various cleanup operations. However, a common issue is that people like to conflate Adobe PDF with images. As such, any application that works with images should also work with PDF. However, since … |
| | I love barcodes. In my line of work (image processing and document imaging), barcodes play an integral part in high quality automation. As such, I've developed code from the lowest level of encoding and decoding barcodes up to using a number of libraries for working with barcodes. The biggest problem … |
| | I'm putting together a new gaming machine, but would like some opinions on the motherboard since I'm weaker in that area. Here are the minimum requirements based on other components I've pretty much nailed down for my needs: * i5-3570K CPU (LGA1155 socket) *-- already purchased, hard requirement* * 16-32GB …  |
| | ## Disclaimer ## Full disclosure, this is a problem I've recently encountered at work. I couldn't find a reasonable solution and ended up recommending a logistics approach rather than a full code approach to solve it. The code performs a subset of required functionality to give users more options, but …  |
| | ##Why Use Arrays?## Let's begin by considering why arrays might be needed. What is the problem that this feature solves? How does it make your life as a programmer easier? When studying new features, it's important to recognize what that feature does for you and where the incentive is in …  |
| | In my job I tend to write a lot of Windows services. Due to this I've pared it down to bare essentials so that the code is as simple as possible, but still fully functional for the needs of each service. What this generally means is I *don't* use the … |
| | This will be a relatively quick article because it's a simple issue. The `system` function gets a lot of flak for being slow because it calls the shell runtime to execute a command, but I rarely see the more devastating issue of security brought up. `system` is insecure in many …  |
| | Hopefully I shouldn't need to explain what `gets` is or why it's easily one of the worst possible standard functions you could call in your code. In my personal opinion, the title for "holy shit, never use this function" is a tie between `gets` and `system`. I'll discuss the problem …  |
| | I was asked this in an interview today: Q: `malloc(0); /* What does it do? */` It's a great question because it covers a subtlety in the standard and a condition that not many people will consider. Unfortunately, I wasn't 100% confident that I remembered what the standard said about … |
| | I was going to post this in a thread, but it turned into something a bit more serious and may be useful as a code snippet. The code shows three files: * menu.h: The header file for the menu library. * menu.c: Implementation of the menu library functions. * main.c: … |
| | As the title says, it's a simple trie class written in C++11. The only operations implemented are insert, remove, and search (both prefix and exact matches). I sort of abandoned the test/debug process, and while I'm somewhat confident that there aren't any serious bugs, I can't guarantee it. Use this … |
| | The annoying use case is this: for (vector<int>::size_type i = 0; i < v.size(); i++) { cout << v[i] << ' '; if (i == v.size() - 1) { cout << endl; } } C++11 offers the `auto` keyword for initializer type deduction so that we can avoid verbose and … |
| | I've needed to write sample code using conio.h over the years, but my compilers don't support all of it (most notable being clrscr() and gotoxy()). So I wrote a conio simulator class to help me. Not all of the conio.h functions are present, such as cgets() and cscanf(), because I … |
| | Another quickie. This is a basic class for working with Windows path strings. It's based off of .NET's System.IO.Path class, but doesn't contain any API dependencies (and thus doesn't normalize the paths, it's all straight string handling). Methods that I've personally found to be useful are included. The class is … |
| | For those of you familiar with the latest C++ standard, what do you think of [uniform initialization](http://en.wikipedia.org/wiki/C%2B%2B11#Uniform_initialization)? Listening to folks like Herb Sutter, it seems like the intended purpose is to be completely pervasive, which obviously changes the look and feel of C++. Do you plan on using it everywhere … |
| | No bells and whistles, just a quickie millisecond timer showing an alternative to the far less portable clock_t method. A test main() is included, just define TEST_DRIVER as a macro or remove the conditional compilation at the end. |
| | C++ conversion of [this C snippet](http://www.daniweb.com/software-development/c/code/445012/simple-interactive-menu) for a simple interactive menuing system. The code shows three files: * menu.h: The header file for the menu class. * menu.cpp: Implementation of the menu class. * main.cpp: A sample driver that uses the library. The menu library is fairly generic in that …  |
| | Provided below is a bare bones dynamic array library. The game is to extend this library with new primitives and features that interest you, that you've needed in the past, or that you feel may be useful. The intention of this game is to give some of the newer folks …  |
| | Encoding and decoding functions for RFC 4648 compliant base-64. The code is written in standard conforming C11 and backward compatible with C99 (pre-C99 is *not* supported without code changes). |
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