Tutorial by Examples: st

You just need run on prompt: lxrun /uninstall /full

T qobject_cast(QObject *object) A functionality which is added by deriving from QObject and using the Q_OBJECT macro is the ability to use the qobject_cast. Example: class myObject : public QObject { Q_OBJECT //... }; QObject* obj = new myObject(); To check whether obj is a my...

The purpose of this documentation is to use a scanner without any user interface. A common use is to upload a PDF scanned file directly to Google Drive or Dropbox just by pressing scanner-buttons. scanbd permits to trigger actions from the scanner buttons, it uses sane. What make things a little b...

Substring returns the portion of string specified by the start and length parameters. var_dump(substr("Boo", 1)); // string(2) "oo" If there is a possibility of meeting multi-byte character strings, then it would be safer to use mb_substr. $cake = "cakeæøå"; var_d...

wxPython Classic is a Python 2 build of the wxPython library. Generation of the python bindings require a large number of manual interventions and the documentation is simply the wxWidgets documentation which contains some annotations on wxPython mechanisms as such there is normally a delay of weeks...

If you want to make a change that you want to merge with master, the best way is to first create a topic branch git checkout -b foo make a single commit with your feature git commit -m "Made the thing X finally work" and push that branch to review via git push origin foo:refs/for/...

Because of how gerrit relies on change-ids, in order to resolve conflicts (pull changes to your topic branch) the best practice is to rebase topic branch onto master/other branch you want to push to. This way you preserve the change-id without having to ammend the merge commit. For example if you su...

Some times application must have panes that docked not to the main frame, but to the child frame. Usually it's MDI application. In MFC Feature pack such child frame is inherited from CMDIChildWndEx class and as main frame (inherited from CMDIFrameWndEx) have all required code for such docking. But ...

Another good practice to check when our threads have finished without block the thread waiting to recover the Future object from our Callable is to create our own implemetation for Runnables, using it together with the execute() method. In the next example, I show a custom class which implements Ru...

@Test annotation can be applied to any class or method. This annotation marks a class or a method as part of the test. @Test at method level - mark annotated method as test method @Test at class level The effect of a class level @Test annotation is to make all the public methods of the class ...

Clustered column store index can be rebuilt if you have a lot of deleted rows: ALTER INDEX cci ON Products REBUILD PARTITION = ALL Rebuilding CLUSTERED COLUMNSTORE will "reload" data from the current table into new one and apply compression again, remove deleted rows, etc. You can re...

Kubernetes was originally developed by Google to power their Container Engine. As such, Kubernetes clusters are a first class citizen at Google. Creating a Kubernetes cluster in the container engine requires gcloud command from the Google Cloud SDK. To install this command locally, use one of the f...

The following is the default code snippet for the BundleConfig.cs file. using System.Web.Optimization; public class BundleConfig { // For more information on Bundling, visit http://go.microsoft.com/fwlink/?LinkId=254725 public static void RegisterBundles(BundleCollection bundles...

Extract all file contents of a zip file import zipfile with zipfile.ZipFile('zipfile.zip','r') as zfile: zfile.extractall('path') If you want extract single files use extract method, it takes name list and path as input parameter import zipfile f=open('zipfile.zip','rb') zfile=zipfile.Z...

ConstantExpression must be the same type of the MemberExpression. The value in this example is a string, which is converted before creating the ConstantExpression instance. private static ConstantExpression GetConstant(Type type, string value) { // Discover the type, convert it, and create Co...

In this very first example, a basic serial write operation is started from an Arduino device. void setup() { // put your setup code here, to run once: Serial.begin(9600); } void loop() { // put your main code here, to run repeatedly: Serial.println("Hello World!"); dela...

Scenario: You need to resolve a dependency when a method is called, not in the constructor. Solution: Inject an abstract factory into the constructor. When the method is called, it requests the dependency from the abstract factory, which in turn resolves it from the container. (Your class depends o...

Unlike var, const/let are bound to lexical scope rather than function scope. { var x = 1 // will escape the scope let y = 2 // bound to lexical scope const z = 3 // bound to lexical scope, constant } console.log(x) // 1 console.log(y) // ReferenceError: y is not defined console.log(z...

Multidimensional arrays follow the same rules as single-dimensional arrays when passing them to a function. However the combination of decay-to-pointer, operator precedence, and the two different ways to declare a multidimensional array (array of arrays vs array of pointers) may make the declaratio...

php bin/magento setup:upgrade => Setup Upgrade php bin/magento setup:di:compile => Setup: Compile php bin/magento indexer:reindex => Reindex php bin/magento cache:flush => Clear Cache php bin/magento deploy:mode:set...