Tutorial by Examples: c

Every Keychain Item is most often represented as a CFDictionary. You can, however, simply use NSDictionary in Objective-C and take advantage of bridging, or in Swift you may use Dictionary and explicitly cast to CFDictionary. You could construct a password with the following dictionary: Swift var...

To construct a query, we need to represent it as a CFDictionary. You may also use NSDictionary in Objective-C or Dictionary in Swift and cast to CFDictionary. We need a class key: Swift var dict = [String : AnyObject]() dict[kSecClass as String] = kSecClassGenericPassword Next, we can specify...

As usual, we first need a CFDictionary to represent the item we want to update. This must contain all of the old values for the item, including the old private data. Then it takes a CFDictionary of any attributes or the data itself that you would like to change. So first, let's construct a class ke...

We need only one thing in order to delete an item from the Keychain: a CFDictionary with attributes describing the items to be deleted. Any items that match the query dictionary will be deleted permanently, so if you are only intending to delete a single item be sure to be specific with your query. ...

The JAR, WAR and EAR files types are fundamentally ZIP files with a "manifest" file and (for WAR and EAR files) a particular internal directory / file structure. The recommended way to create these files is to use a Java-specific build tool which "understands" the requirements f...

from __future__ import print_function import os, sys from PIL import Image for infile in sys.argv[1:]: f, e = os.path.splitext(infile) outfile = f + ".jpg" if infile != outfile: try: Image.open(infile).save(outfile) except IOError: ...

The Oracle Java Tutorials summarize Web Start as follows: Java Web Start software provides the power to launch full-featured applications with a single click. Users can download and launch applications, such as a complete spreadsheet program or an Internet chat client, without going through lengt...

Functions are an important part of Julia programming. They can be defined directly within modules, in which case the functions are referred to as top-level. But functions can also be defined within other functions. Such functions are called "closures". Closures capture the variables in th...

This example is divided into two pillars SalaryCalculation Class : Calculating the net salary after tax deduction SalaryCalculationTests Class : For testing the method that calculates the net salary Step 1: Create Class Library, name it WagesLibrary or any appropriate name. Then rename the cl...

By default Controllers, ViewComponents and TagHelpers aren't registered and resolved via the dependency injection container. This results in the inability to do i.e. property injection when using a 3rd party Inversion of Control (IoC) container like AutoFac. In order to make ASP.NET Core MVC resolv...

dispatch_group_t preapreWaitingGroup = dispatch_group_create(); dispatch_group_enter(preapreWaitingGroup); [self doAsynchronousTaskWithComplete:^(id someResults, NSError *error) { // Notify that this task has been completed. dispatch_group_leave(preapreWaitingGroup); }] dispatch...

Prerequisites Have a strong grasp of a programming language such as Python, C, C++, Ruby, or any of the other languages out there. Have your favorite code editor or IDE installed (one such example is VSCode) Stay motivated. Constructing a compiler is not easy, so keep pushing; it's worth the ef...

In Google Chrome's developer tools "Elements", you can see that the selected line shows ==$0 that is the DOM node index(as shown below): $0 returns the most recently selected element or JavaScript object, $1 returns the second most recently selected one, and so on. This is useful ...

#include <ctype.h> #include <stdio.h> typedef struct { size_t space; size_t alnum; size_t punct; } chartypes; chartypes classify(FILE *f) { chartypes types = { 0, 0, 0 }; int ch; while ((ch = fgetc(f)) != EOF) { types.space += !!isspace(ch); types.al...

#include <ctype.h> #include <stddef.h> typedef struct { size_t space; size_t alnum; size_t punct; } chartypes; chartypes classify(const char *s) { chartypes types = { 0, 0, 0 }; const char *p; for (p= s; p != '\0'; p++) { types.space += !!isspace((unsigned ...

Configuration Log4j configuration file can be in any of these formats: JSON YAML properties (text file) XML Configuration discovery Log4j will inspect the log4j.configurationFile system property and, if set, will attempt to load the configuration. If no system property is set log4j wil...

For example, we have two environments: CI - Staging and want to add some customizations for each environment. Here I will try to customize server URL, app name. First, we create two targets for 2 environments by duplicating the main target: For each target, we will define a custom macro. Here I ...

C++ #include "opencv2/objdetect/objdetect.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include <iostream> #include <stdio.h> using namespace std; using namespace cv; // Function Headers void detectAndDisp...

There is a useful package in Python - chardet, which helps to detect the encoding used in your file. Actually there is no program that can say with 100% confidence which encoding was used - that's why chardet gives the encoding with the highest probability the file was encoded with. Chardet can dete...

This example has more tests available in unit testing. Employee.vb (Class Library) ''' <summary> ''' Employee Class ''' </summary> Public Class Employee ''' <summary> ''' First name of employee ''' </summary> Public Property FirstName As String = &q...