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DB9 male Female header pin definition and connection

1. Introduction of physical and pinIn the development of the time will often use the serial interface, the general 9-pin serial interface is mostly. As shown in the following:The male female head is used in the package for connecting wire. However, a 90-degree angled pin package is used for the Development Board. Such as:Each pin is defined as:2. Connection of male female head to MAX232When the male head is connected to the MAX232, we will find that the defi

Python decorator definition and application example explanation

definition of the now () function, which is called an "adorner" (Decorator) in a way that dynamically adds functionality during code execution. Essentially, decorator is a higher-order function that returns a function. So, we want to define a decorator that can print the log, which can be defined as follows: def log (func): def wrapper (*args, **kw): print (' Call%s (): '% func.__name__) return func (*args, **kw) Return wrapper

Design iPhone applications: from product definition to brand promotion

When you develop an iPhone applicationProgramYou need to understand the impact of various aspects of the iPhone OS and mobile device environment on your design. This chapter covers the guidelines for a series of programming issues from product definition to brand promotion, and describes how to solve these problems in iPhone applications. Product Definition Before designing your application, it is im

Activiti query Process Definition

Packagecom.mycom.processDefinition;ImportJava.io.InputStream;Importjava.util.List;ImportJava.util.zip.ZipInputStream;ImportOrg.activiti.engine.ProcessEngine;ImportOrg.activiti.engine.ProcessEngines;Importorg.activiti.engine.repository.Deployment;Importorg.activiti.engine.repository.ProcessDefinition;Importorg.junit.Test; Public classprocessdefinitiontest {processengine processengine=Processengines.getdefaultprocessengine (); /** Deployment process definition

PHP constant Definition and Usage instance summary

What is a class constant? What we can understand in PHP is that the value is constant, so what is a class constant? In fact, the class constants are also easy to understand, we can always keep the constant value of the class is called constants, and this constant can be called the class constant. Be sure to remember that you do not need to use the "$" symbol when defining and using constants. A class constant belongs to the class itself, not to an object instance, and cannot be accessed through

The definition of---Class of OC learning article

file of the class Person.h (which is usually done in this file), There is also a person.m file, which is generally implemented as defined in the header file. This is also a continuation of the C language of the project structure it. General header files are only responsible for defining functions, and. c files are responsible for implementing specific functions. It's similar here.Here's a look at the definition format for the class in the Person.h he

function of the local descriptor descriptor of LDT + definition + initialization + jump correlation

"0" written in front0.1) The purpose of this code:The purpose of this text is to explain the function of the local descriptor, its definition, initialization and jump, etc.0.2)The personal summary at the end of the article is dry, the preceding code is for reference only, and source code from Orange's implemention of a OS.0.3)Since the code in this article and the "Steps of the real mode and protected mode switching" source code has a similarity of 90

C language incomplete type and delay definition

Always thought that my C language can still, although not superb, but at least more familiar with it. But a while ago read a tweet, and then Baidu a bit of C language is not the exact type. Found me. C language is not completely type and the use of a very wide range of delay definitions have no concept. These two days looked closely at the relevant concepts and experimented with the code.This article is structured as follows: Introduction to the concept of non-complete type of C languag

Php301 second-level domain name definition method-PHP source code

Ec (2); php301 second-level domain name definition method lt ;? Php nbsp; 02 lt; SPANclasst_tagonclicktagshow (event) href quot; tag. php? Name % B3 % CC % D0 % F2 quot; gt; program lt; SPAN gt; modified by uit88! Nbsp; 03 $ mydomin $ _ SERVER [HTTP _ script ec (2); script Php 301 second-level domain name definition method 02 // bookProgramModified b

Wss3sdk: create a custom list definition through feature

This task shows how to create a custom list template feature and add itCreateAvailable List Templates on the page. To add a custom list definition, you must provide the following three files: Feature. XML is used to register a list template. Elements. XML adds the list templateCreatePage. Schema. xml defines the structure of the list, which content types are associated, the definition of field

Golang function One (definition, parameter, return value)

This is a creation in Article, where the information may have evolved or changed. For the definition or understanding of the Golang function: function is the smallest modular unit in structured programming, which breaks down the complex algorithm process into several small tasks (blocks of code), makes the program structure clearer, improves the readability of the program, and is easy to maintain later and let others read your code. In addition, to be

Front Desk Interface (1)---HTML basic definition and common tags

has been a long time no update blog, starting today to continue to walk on the road of learning, words do not say, first to dry:Directory1. HTML Definitions2. H Tag3. IMG Tag4. P Label5. A Label6. unordered list7. Sequence list8. Form Form9. Text Input textboxButton SubmitOne-click Radio buttonA. Check buttonDiv Tags-------------------------------------------the Golden dividing line------------------------------------------------Content1.HTML definition

DotNetNuke Skinning Whitepaper (definition section)

Translation: Definition Another important aspect to consider in any skin solution is the definition of the skin author. Who will create skin? What technology suits them better. What kind of design tools are used in their daily work. Demand analysis in this area has far-reaching implications for determining how the skin is defined. Although ASP.net's user-control technologies provide us with strong core su

This helps you quickly understand the definition and advantages of stored procedures.

Definition and advantages of "stored procedure" Stored Procedure Compile the SQL statement before executing it. Stored procedures are compiled SQL statements. It can be called directly when the application needs to be used, so the efficiency will be high. Stored Procedure A stored procedure is a process written by flow control and SQL statements. The procedure is compiled and optimized and stored on the database s

SharePoint Study Notes-site definition series-2. Create content type

website. Expand the contenttype node, find the picture node, and then you can view the ID number of the corresponding field, which can be copied directly to this solution. 2. Define the new field we want to add In this example, we add two fields. One is the original site column named about me in the system. The method for obtaining the ID is the same as above: Use server exploer We gave it a new displayname = "information about this pict

Translation-Golang version Management VI: definition of Golang dependent library

are handled by caching proxies. Proxy Server An independent developer or company will need to update the Golang dependency Library from a proxy server instead of the original address. Some of this is due to the speed of the network, or it may be from security, open Source protocol versions, or other reasons. According to the above two chapters in the format of Go module and the

Linux Shell Learning Note two---Custom functions (definition, return value, variable scope) Introduction

The Linux shell can be user-defined functions and can be called casually in shell scripts. Here's how to define it, and what to call attention to. I. Defining shell functions (define function)Grammar: [Function] funname [()] { Action [Return int;] } Description 1, can be with function fun () definition, you can also directly fun () definition, without any parameters.

(one) condition definition, handling in MySQL

Tags: mysql conditional definition handles exception captureOverview In MySQL, specific exceptions require specific processing. These exceptions can be linked to errors, as well as general process control in subroutines. 定义异常is to define in advance the problems encountered during the execution of a program, which defines how the process should be handled when a problem is encountered, and that the stored procedure or function can continue to execute w

Definition of Python function, parameter passing in and invocation of function

As an abstract way of computer code, functions play a very important role in Python. Today we introduce the definition of Python functions, the introduction of parameters, and how to invoke them. Where the function parameters are passed in in this section is the key content. The parameters of the Python function include required parameters, default parameters, mutable parameters, named keyword parameters, and keyword parameters. Five types of paramete

Definition and usage of Java arrays

An array is a collection of ordered data, and each element in the array has the same array name and subscript to uniquely determine the elements in the array.1. One-dimensional arrays1.1 Definition of one-dimensional arrayType arrayname[];Type[] Arrayname;The type can be a random data type in Java, contains a simple type combination type, the array name arrayname to a valid identifier, [] indicates that the variable is an array type variable.Another f

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