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enum ReadResult{ case Successful case Failed case Pending } struct OutpuData { var data = Data() var result: ReadResult var error: Error? } func readData(from url: String, completion: @escaping (OutpuData) -> Void) { var _data = OutpuData(data: Data(), ...

This shows you how to use Microsoft.Extensions.DependencyInjection nuget package without the use of the WebHostBuilder from kestrel (e.g. when you want to build something else then a webApp): internal class Program { public static void Main(string[] args) { var services = new Se...

IServiceCollection To start building an IOC container with Microsoft's DI nuget package you start with creating an IServiceCollection. You can use the already provided Collection: ServiceCollection: var services = new ServiceCollection(); This IServiceCollection is nothing more than an implemen...

First of all you'll need to have a key pair. If you don't have one yet, take a look at the 'Generate public and private key topic'. Your key pair is composed by a private key (id_rsa) and a public key (id_rsa.pub). All you need to do is to copy the public key to the remote host and add its contents...

QSize MainMenuListView::Header::sizeHint() const { // fontmetrics() allows to get the default font size for the widget. return QSize(menu->headerAreaWidth(), fontMetrics().height()); } void MainMenuListView::Header::paintEvent(QPaintEvent* event) { // Catches the paint event ...

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { QWidget* w = new QWidget(this); QHBoxLayout* hbox = new QHBoxLayout(); QVBoxLayout* vBox = new QVBoxLayout(); menuA = new MainMenuListView(w, "Images"); menuB = new MainMenuListView(w, "Video...

Here is a sample output: As you can seen above, it can be useful for creating stacked menus. Note that this sample is trivial. The two widgets have the same size constraints.

The QTimer::singleShot is used to call a slot/lambda asynchronously after n ms. The basic syntax is : QTimer::singleShot(myTime, myObject, SLOT(myMethodInMyObject())); with myTime the time in ms, myObject the object which contain the method and myMethodInMyObject the slot to call So for exampl...

The grid layout is a powerful layout with which you can do an horizontal and vertical layout a once. example: #include "mainwindow.h" #include <QApplication> #include <QMainWindow> #include <QWidget> #include <QVBoxLayout> #include <QPushButton> #inc...

Let's suppose we want raise x to a number y. You'd write this as: def raise_power(x, y): return x**y What if your y value can assume a finite set of values? Let's suppose y can be one of [3,4,5] and let's say you don't want offer end user the possibility to use such function since it is v...

Detailed instructions on getting blackberry set up or installed.

Detailed instructions on getting apk set up or installed.

To set up a simple hibernate project using XML for the configurations you need 3 files, hibernate.cfg.xml, a POJO for each entity, and a EntityName.hbm.xml for each entity. Here is an example of each using MySQL: hibernate.cfg.xml <?xml version="1.0" encoding="utf-8"?> &...

Detailed instructions on getting rmarkdown set up or installed.

To access the Open Resource dialog use Ctrl + Shift + R. From here you can start typing a resource name and it will find all matches in the workspace, this makes it easier to find a file when you don't know exactly were it is.

If you want System.out.println(); but don't want to type the whole thing out you can just type syso and hit Ctrl + Spacebar. It will type the rest and set the cursor between the parenthesis.

hql = "Select id, name From Employee";

You can include HTML comments in JSPs as well. You use the basic html comment syntax: <!--Comment goes here--> The difference between using JSP style comments and HTML style comments is the JSP ones will not be included when the HTML is generated and the HTML style comments will be. So it ...

QtCreator is, at the moment, the best tool to create a Qt application. In this example, we will see how to create a simple Qt application which manage a button and write text. To create a new application click on File->New File or Project: Then choose the Projects->Application->Qt Widge...

As this is an audio, we don't need a QVideoWidget. So we can do: _player = new QMediaPlayer(this); QUrl file = QUrl::fromLocalFile(QFileDialog::getOpenFileName(this, tr("Open Music"), "", tr(""))); if (file.url() == "") return ; _player->setMedia(f...