how to use textedit

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NSString property when to use copy, when to use strong?

when we declare a NSString property, there are usually two choices (based on the ARC environment) for its memory-related attributes: Strong and copy. So what's the difference between the two? When should I use strong, when should I use copy? Let's look at an example first. ExampleWe define a class and declare two string attributes for it, as follows: 1 2 3 4 @interfaceTestStringClass()@

QT5 the creation and use of dynamic link libraries (QT makes the dynamic library for its own use)

Record the creation and use of the QT5 dynamic link libraryComplete code at the end of the article for download1. Create a dynamic link libraryCreate a new library item firstSelect chose to go to the next page, type select Shared Library, enter a name: I'm typing a SLD.Then click Next toIf we need qtgui here, we'll pick it up.Then click Next until you finishWe add in the. Pro fileDESTDIR =.. \mydebugIt means that we put the generated content in this f

Use of class clusters in OC and the use of attributes in initialization methods

manually and it is clear from Apple's official documentation that the objects created and the retain objects are kept by themselves, all of which are in the heap area. The memory of the static zone is actually compiled and allocated, its memory address is very forward, and the entire stage of the program is running, so we can not release.About class cluster The most cited example is the NSNumber class, in fact NSNumber class is an abstract superclass, there are a lot of specific subclasses, suc

How do I use the BBCode code? And how is it safe to use?

I think it should be like this: 1 receive the text with BBCode. 2 text with BBCode is stored directly in the database. ----3.1 If you want to display, use a function that converts text with BBCode to HTML. ----3.2 If you want to edit, display the text with BBCode directly. The main security aspect is to block HTML tags. How should this be blocked? is to add htmlspecialchars () directly at the first step of receiving it? Does this interfere with the

How can I use Php to generate a real Excel file? PS: Do not use PHPEXCEL too card

How can I use Php to generate a real Excel file? PS: it is too difficult to use PHPEXCEL! Recently, a project needs to export data in large batches to an Excel file. PhpExcel is used in the early stage. it is okay when the data volume is small! However, when a large volume of data reaches 10 thousand rows, the memory consumed is too high and can easily overflow! If you

Use JavaScript to wrap text element nodes with a DIV, and use javascriptdiv

Use JavaScript to wrap text element nodes with a DIV, and use javascriptdiv When your application depends on a specific JavaScript class library, you will always try to solve the problems of some class libraries rather than the language. For example, when I try to wrap text (which may also contain HTML elements) with a DIV element. Suppose there are the following HTML: This is some text and At this time, i

Use Struts2 and jQuery EasyUI to implement a simple CRUD System (iii) -- ajax. Use json format for struts2 interaction.

Use Struts2 and jQuery EasyUI to implement a simple CRUD System (iii) -- ajax. Use json format for struts2 interaction. Following the previous article: Using Struts2 and jQuery EasyUI to implement a simple CRUD System (II) -- interaction between ajax and struts2, next we need to transmit data in json format. Here are the three methods: 1. As mentioned in the last article, it is not difficult to convert the

Use htmlentities and htmlspecialchars to filter input operations in php, and use htmlspecialchars to filter input operations

Use htmlentities and htmlspecialchars to filter input operations in php, and use htmlspecialchars to filter input operations This example describes how to filter input in php using htmlentities and htmlspecialchars. We will share this with you for your reference. The details are as follows: Filtering input (that is, any data from the listed data sources) refers to escaping or deleting insecure characters. B

Use View.bag to save JSON strings in MVC. Use in JS without Ajax request ....

Sometimes we only need to use the JSON data, this time directly in the background to find out the JSON, and then use View.bag to the foreground, it will be very convenient. (It feels a little superfluous to ask for Ajax at the front desk.) )On the CodeBackground: PublicActionResult Index () {ListNewList(); Str. ADD (NewClass1 () {name="Gao", age=" -"}); Str. ADD (NewClass1 () {Name ="Cong", age =" +" }); /

Use python to draw a heart. Use python to draw a heart.

Use python to draw a heart. Use python to draw a heart. Preface Python generally uses Matplotlib to create statistical graphs. In its own statement, 'Make simple things simple and make complex thes '. You can use it to create line charts, histograms, bar charts, scatter plots, pie charts, and spectral charts, these images can be exported to multiple formats with

Key summary of using El Expression in JS: Use El expression in JS must use double quotation marks

The key summary of using El Expression in JS: Use El expression in JS to be sure to add double quotesThe EL expression is used in JS control, and the source code is as follows:Java code var selected = ${requestscope.xxxxform.recordnumperpage} This always JS error, because requestScope.xxxxForm.recordNumPerPage is null at the first time. So under the boss's guidance, simply add two quotes, the code intoJava code varselected=" ${

Use VMware Workstation Pro in windows, create a virtual machine in ubuntu, and use vmwareubuntu

Use VMware Workstation Pro in windows, create a virtual machine in ubuntu, and use vmwareubuntu This document describes how to use VMware Workstation Pro in windows to create a virtual machine in ubuntu. Step 1 【File]---【Create a VM] The create VM wizard dialog box appears in step 2. Standard: Create the VM according to the standard configuration. Custom

How to use the "disk detection function" of Ghost to use the "disk detection function" of Ghost

How to use the "disk detection function" of Ghost to use the "disk detection function" of GhostBecause I have stored a large amount of data on the e-disk on my computer, the space is too short, and there is a lot of space left on disk C and disk D. Why don't I divide it into parts for the e-disk? Therefore, I used the lossless partition software PartitionMagic (PQ) in Windows to distribute the 1 GB disk and

Use of DBubtil, use of DBubtil

Use of DBubtil, use of DBubtil 1. What is O-R Mapping (Object-link ing) Commonly used O-R Mapping tools Hibernate (fully automated framework) Ibatis (semi-automatic framework/SQL) Commons dbutils (simple encapsulation of JDBC) There are also JPA and so on, this is not particularly known, so far it has come into contact with Hibernate and DbUtils, Hiabernate give people do not need to write SQL statements, d

Use javascript to verify the mobile phone number and implement asterisks (*) to replace the instance, and use javascript asterisks

Use javascript to verify the mobile phone number and implement asterisks (*) to replace the instance, and use javascript asterisks I. use JavaScript to replace four digits in the middle of the mobile phone number // Match the beginning and end of the mobile phone number, and output '123' in a format similar to "123 *** 8901 '. replace (/(\ d {3}) \ d {4} (\ d {4}

Details about how to use AJAX and how to use AJAX

Details about how to use AJAX and how to use AJAX As asynchronous transmission, AJAX is very convenient and useful for local refreshing! First, there are four steps to use AJAX: 1. Create an AJAX object var xmlHttp = new XMLHttpRequest(); 2. Establish a connection ('submission method ', 'url address ') xmlHttp.open('get','./AJAX_XML.xml'); 3. Determine the ajax p

Initial use of jspSmartUpload, use of jspSmartUpload

Initial use of jspSmartUpload, use of jspSmartUpload Use SmartUpload in jsp to upload files 1. Download The jspSmartUpload component and decompress it. Copy the com directory to the WEB-INF \ classes directory of the application. 2. Pay special attention (1) Add enctype = "multipart/form-data" to the file upload form, for example: (2) For file upload forms, the

Use the Compass method in Vue, and use the compass method in vue.

Use the Compass method in Vue, and use the compass method in vue. Motivation After a long delay, I finally made up my mind to write my own personal websites. Not only do I have to look so cool, but I also need to be OK with technology, so take this opportunity to exercise your unfamiliar technologies. The website plans to use Vue as the front-end framework, and C

How to Use vnc to access your computer and use the same session

How to Use vnc to access your computer and use the same session? 1. Run vncserver-alwaysshared:Vncserver-alwaysshared: 1-geometry 1440 × 900 2. There is a system tool in ubuntu: desktop sharing is selected at the top of the two sharing options: allow others to view your desktop, allow others to share your desktop as a security option: require remote users to enter this password (the first Access confirmatio

The simple use of webservice, the use of the CXF framework

Web Serviceis aPlatformIndependent, low-coupling, self-contained,Programmingof theWebapplication, you can use an openXML(Standard Universal Markup Languagea subset of the following)Standardcome toDescription, Publish, Discover, orchestrate, and configure these applications for the development of distributed, interoperableApplication. The Web service technology enables different applications running on different machines to exchange data or integrate

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