2,322 Reusable Code Snippet Topics
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| | #Web app state management# The current state of the user interface determines which application actions are enabled and thus which html elements are enabled for the user to invoke them. Classes are used in the html to indicate elements that need to be managed. Then jQuery is used to configure … |
 | Finding some text and replacing it with new text within a C string can be a little trickier than expected. Here is what I had come up with one day.  |
 | This short piece of code shows you how to display text in color in a C# windows console program. The corresponding WIN32 API functions are in the kernel32.dll and are imported and declared external. The only other problem is to assign variable types that accommodate the types listed in the … |
| | This snippet will allow you to easily work with session variables in your applications. This example is using a string type but it works the same for any data type, you would just need to change the default return value from string.Empty to something more appropriate. |
| | A permutation is the arrangement of a set of items in different order. One interesting application is the rearrangement of characters in a word to create other words. If all the n characters are unique, you should get n! unique permutations. You can make a list of words unique by … |
| | Scientists and deficit spenders like to use Python because it can handle very large numbers. I decided to give it a test with factorials. Factorials reach astronomical levels rather quickly. In case you can't quite remember, the factorial of 12 is !12 = 1*2*3*4*5*6*7*8*9*10*11*12 = 479001600, that is 479 million …  |
| | This snippet allows you to find the number of ordered permutations of items taken from a population of known size. It uses the well know algorithm with factorials. For very large populations you may want to use an approximation of factorials. |
| | If you want to know the number of combinations of x things taken n at a time, you can use the Python module gmpy. The module gmpy is a C-coded Python extension module that supports fast multiple-precision arithmetic, very handy if x things reach a large number. |
 | Upon resizing an anchored combobox - I noticed the text was always selected. This sparked the initiative to fix this problem. (Microsoft decided not to) So by extending the combobox class we can fix this. The following class can be dropped into a form for designer manipulation or as a … |
 | A lot of questions in the VB.NET forum are database related. Most of the code that gets posted result in one or more comments like "use parameterized queries to avoid SQL injection attacks". I won't describe the nature of a SQL injection because it is easily looked up via google. … |
| | This Python snippet shows how to control a VPython visual 3D sphere with Tkinter GUI toolkit button clicks. |
| | Let's imagine you are taking a lot of pictures and modify them with one of those fancy image editors. You burned the image files to a CD, and decided to purge some of the outdated files because your hard drive is getting full. This Python code allows you to set …  |
| | 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 … |
| | So, in answering another thread on this forum, I decided to do some performance testing on String. Mainly because a friend of mine said "You should always use `new String` it's the fastest!". I wasn't convinced and argued in favour of StringBuilder, at which point I was directed to some …  |
| | A simple code example to calculate the monthly payment on a mortgage loan. Takes a look at Python's newer print and format functions. |
 | The following snippet will show, how you can pass a data array to a function, and generate a table with N columns. `$data` contains some dummy data, which can come from any data source. Then you call `createHtmlTable` passing the data, the number of columns you want, and a function, … |
 | This shows the code for one simple crypt of text by swapping two adjoining characters each. You can make that more complex if you like. Can also be used for one nice riddle. |
 | This snippet defines a Print function which can be used with python 2.4, 2.5, 2.6 and 3.0 (for 3.0 this is just the built-in print function). It's interface is that of the python 3.0's print. It simplifies the task of writing transitional code which runs under python 2.5 and python …  |
| | Just a different way to extract desired data from an xml code string.  |
 | Hello Everyone, Please accept my simple and humble contribution. This script will validate if the user or visitor is a suspected spammer, by utilizing the stopforumspam API. Example implementation ## example usage. These items can be from database or from form input. The choice of implementation is all up to … |
 | Here is my celebration post for entering level 3 in Project Euler. Again I left in my debug prints. I am in process of adapting myself to new .format style of formatting. I have commented out the prints though to get visible the running time of the functions own action. … |
| | Explore the Python module bisect to search a sorted list and insert elements in the proper location in a sorted list. |
 | I wanted to make an array of bits which I could click on and off at will. Sort of a register you could manipulate. First thing that came up was a checkbox control. But I wanted to change the usual checkmark with a 1 or a 0. With tips from … |
| | A short code to show you how you can download and display an image from the internet on Python's Tkinter GUI toolkit. |
| | These are (I guess) the most basic printing instructions in C#, to let some printed paper coming out of a printer. Start a new Forms application, drop a ComboBox, a Label and a Button on the form. Implement a form Load and a Button Click event and fill in the … |
| | Just a simple Jython code to test drawing on the canvas. |
| | One of the things I have been steadfastly avoiding is writing code to print stuff. Most of what I want to print is from withing apps like Outlook or Word that already provide that functionality. But I finally ended up having to bite the bullet. What I ended up with …  |
| | 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 … |
| | A small test program exploring the PySide/PyQT Label widget. With HTML code you can do some nice formatting of the label's text. |
| | 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 … |
| | The PySide/PyQT QValidator restricts the type of input a widget like QLineEdit can accept. Here is a simple test. |
| | Another exercise in applied geometry. This time we use the Tkinter GUI canvas and its create_line() function to draw a triangle, or a series of connected triangles to create something that looks like fancy art work. You might be able to impress grandmama with that one! |
 | Recently, I saw somebody start a "Deal or No Deal" game in the Posting Games section. This got me thinking of writing a program to actually play the game based on the rules of the show. So I spent a couple of hours writing this in ANSI-C. I probably should … |
| | A function to take a text and extract the string between two given substrings. Allows you to find the nth occurence. Also safeguards against dead ends. |
| | After seeing quite a few posts today asking about event handlers for dynamicly created controls, I have decided to give a little example for reference. **Note that you should check [Microsoft's Documentation](http://msdn.microsoft.com/en-us/library/system.windows.forms.control.aspx#inheritanceContinued) ( or research from web ) of any control if you are struggling** |
| | To Check the Given Triangle is Isocles , Equilateral or Right Angled Triang |
| | You may want to call Python's list the answer to other computer languages' arrays. Here we take a look at the things you can do with lists, create an empty list, list the attributes and methods, load, append, count, insert, join, pop, remove, remove duplicate items, reverse, search, sort, establish … |
 | Here is a fully working PHP page viewer, set the variables $pages[] = "ANY URL HERE"; to suit your needs, and change the variable $max = 10; to however many views you want for each $page. -Echo |
| | 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 … |
| |  Here is a version in Python of program from classic Lisp book (see http://www.daniweb.com/software-development/legacy-languages/code/446235/simple-scheme-functions-for-finding-impedance-for-norvigs-implementation for the details) for calculating impedance of a circuit. (Example circuit with 1MOhm like in the book's code not like in diagram) |
| |   I did translation to minimal Scheme implementation of Norvig written in Python (http://www.daniweb.com/software-development/python/threads/359370/norvig-an-even-better-lisp-interpreter-in-python) of the impedance code defined in classic book **Lisp by *Patric Henry Winston* and *Berthold Klaus Paul Horn*** from year 1981 (first computer book I ever bought). Errata: diagram has 10 MOhm when … |
| | This PySide (PyQT) code sample shows you how to apply a StyleSheet to a GroupBox containing a number of RadioButtons. |
| | This code will not work on EMU8086 or any processor prior to 80286. Line 40 would need to be changed. |
| | A little fun drawing with the Python module turtle. Well commented to help the beginner. |
| | Upon aiding a friend - I have decided to post the example used here. The following is a snippet that shows basic class inheritance. The source file as well as a test case can be found attached. You can test these classes with the following code: Dim cNew As New … |
 | This is one of the fastest ways to get data submitted by a HTML form, make it readable and send it by e-mail. Fast and easy. From the raw example to some basic functionality. |
| | 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 … |
| | If you draw shapes that are closely spaced and shifted, you can create interesting interference patterns, so called moire patterns. Here is an example using the Python module PyGame to do the drawing. |
| | This small code example shows you how to approach the beginning concept of an very simple "IDE" for Python. |
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