Tutorial by Examples: r

A deadlock is what occurs when two or more threads are waiting for eachother to complete or to release a resource in such a way that they wait forever. A typical scenario of two threads waiting on eachother to complete is when a Windows Forms GUI thread waits for a worker thread and the worker thre...

A deadlock is what occurs when two or more threads are waiting for eachother to complete or to release a resource in such a way that they wait forever. If thread1 holds a lock on resource A and is waiting for resource B to be released while thread2 holds resource B and is waiting for resource A to ...

To draw a vector SVG image, the operation is not different from a raster image : You first need to load your SVG image into an HTMLImage element, then use the drawImage() method. var image = new Image(); image.onload = function(){ ctx.drawImage(this, 0,0); } image.src = "someFile.SVG&...

This is a nice trick to add a link to code, so it will be easy to jump to the code that issued the log. With the following code, this call: MyLogger.logWithLink("MyTag","param="+param); Will result in: 07-26...012/com.myapp D/MyTag: MyFrag:onStart(param=3) (MyFrag.java:236...

Current updates the branch on the remote repository that shares a name with the current working branch. git config push.default current Simple pushes to the upstream branch, but will not work if the upstream branch is called something else. git config push.default simple Upstream pushes to t...

This is the basic way to insert data from another table with the SELECT statement. INSERT INTO `tableA` (`field_one`, `field_two`) SELECT `tableB`.`field_one`, `tableB`.`field_two` FROM `tableB` WHERE `tableB`.clmn <> 'someValue' ORDER BY `tableB`.`sorting_clmn`; You can...

Drop Table is used to delete the table from database. Creating Table: Creating a table named tbl and then deleting the created table CREATE TABLE tbl( id INT NOT NULL AUTO_INCREMENT, title VARCHAR(100) NOT NULL, author VARCHAR(40) NOT NULL, submission_date DATE, PRIMARY K...

Each group ends with a line separator. If each item in your menu has its own group you will achieve the desired graphical output. It will work only if your different groups have different android:id. Also, in menu.xml remember to mention android:checkable="true" for single item and android...

When using the interactive interpreter, you might want to reload a module. This can be useful if you're editing a module and want to import the newest version, or if you've monkey-patched an element of an existing module and want to revert your changes. Note that you can't just import the module ag...

Vim macros can also be recursive. This is useful for when you need to act on every line (or other text object) till the end of the file. To record a recursive macro, start with an empty register. (A register can be emptied using q<register>q.) Choose a consistent starting point on each line ...

To hide the blinking caret, you need to override caretRectForPosition of a UITextField and return CGRectZero. Swift 2.3 < public override func caretRectForPosition(position: UITextPosition) -> CGRect { return CGRectZero } Swift 3 override func caretRect(for position: UITextPositio...

We can change the style of the placeholder by setting attributedPlaceholder (a NSAttributedString). var placeholderAttributes = [String: AnyObject]() placeholderAttributes[NSForegroundColorAttributeName] = color placeholderAttributes[NSFontAttributeName] = font if let placeholder = textField.p...

Reflection is useful but fragile. Consider this: let mi = typeof<System.String>.GetMethod "StartsWith" The problems with this kind of code are: The code doesn't work because there are several overloads of String.StartsWith Even if there wouldn't be any overloads right now la...

Starting a File Chooser Activity public void showFileChooser() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); // Update with mime types intent.setType("*/*"); // Update with additional mime types here using a String[]. intent.putExtra(Intent.EXTRA_M...

Detailed instructions on getting docusignapi set up or installed.

Here is a basic example form with one required text field and one submit button, which submits to a custom function: class Page_Controller extends ContentController { private static $allowed_actions = array( 'ExampleForm' ); public function ExampleForm() { $fiel...

os.mkdir('newdir') If you need to specify permissions, you can use the optional mode argument: os.mkdir('newdir', mode=0700)

Use the os.getcwd() function: print(os.getcwd())

The os module provides an interface to determine what type of operating system the code is currently running on. os.name This can return one of the following in Python 3: posix nt ce java More detailed information can be retrieved from sys.platform

Remove the directory at path: os.rmdir(path) You should not use os.remove() to remove a directory. That function is for files and using it on directories will result in an OSError