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. NET encryption and decryption of binary files (C #)

Binary | encryption | decryption The following class implements the file encryption and decryption operations, the test of several file types are no problem, and now share with you. Namespace Mycryptohelp{<summary>Exception Handling Class</s

Linux multi-thread synchronization

Introduction A condition variable is a mechanism for synchronizing a global variable shared between threads, consisting mainly of two actions: one thread waits for the condition variable to hang (the

JavaScript Ajax Asynchronous

Synchronous calls are simple, but using asynchronous calls is the only way we're really used to. When using an asynchronous call, you need to trigger the ReadyStateChange event and then detect the ReadyState property. This property has five values:

Display pictures randomly with javascript+php

Random | Show presumably you'll use JavaScript to randomly display pictures. But what if the information of the picture (such as links) is constantly changing, or modified and added by the user? I have a way here. Put the picture information (such as

Detailed. NET encryption and decryption algorithm (2) symmetric encryption

This blog post lists the. NET under the common symmetric encryption algorithm, and they are made into small demo, hope to be helpful to everyone. Common code Static byte[] CreateKey (int num) {

PHP Verification Code Class example

  This article mainly introduces a useful PHP verification code Class example, the need for friends can refer to the Share a handy PHP authentication code class, including the call example. Not

Flash Example: AS3 make a cup vibration animation

The production process is as follows: First prepare a picture as the background, as follows: Then create a new layer, import a teapot material, then turn it into a movie clip, and then name the instance. There are currently two layers, and the

JavaScript page with random display of pictures special effects source code

javascript| Random | effects | web | page Effects | show | Source code First get a JS file, such as Image.js, the code is as follows: Today=new Date (); Jran=today.gettime (); function rnd () { ia=9301; ic=49297; im=233280; Jran = (jran*ia+ic)% im; R

An example of SQLServer2012 mathematical function

1 absolute Value function abs (x) Cases: SQL query: ? 1 SELECT ABS ( -1), ABS (0), ABS (1) Execution results: 2 square root function sqrt (x) Cases: SQL query: ?

Php+mysql implementation of database random rearrangement example

The main implementation code is as follows: code is as follows: &lt;?php //database connection not written in here. $s = isset ($_get[' s ']) $_get[' s ']:0; $e = isset ($_get[' e ']) $_get

Java Array Initialization

Initializing an array in C is extremely error-prone and cumbersome. C + + makes it more secure by "set initialization" (annotation ⑥). Java does not have a "set" concept like C + +, because everything in Java is an object. But it does have its own ar

MySQL 5.0 new features tutorial stored procedures: Second lecture

Why MySQL statements are Legal in a Procedure body What is a MySQL statement that is legal in the stored procedure body? What kind of SQL statement is legitimate in a MySQL stored procedure? You can create a statement that contains inserts, Update,d

Baidu engineers talk about the implementation principle and performance analysis of PHP function (III.)

This article mainly introduced Baidu engineers talk about the implementation of PHP functions and performance Analysis (c), this article explains the common PHP function implementation and introductio

Instance programming: Maze Pathfinder III

Consider a tree from the maze entrance to the shortest path near the point. The shortest path near the exit can be found by means of breadth traversal. The algorithm idea of this program originates from the Dijkstra algorithm of finding the shortest

3 principles for adding a MySQL index

One, the importance of indexing Indexes are used to quickly find rows that have a specific value in a column. Without indexing, MySQL must start with the 1th record and read through the entire table until the relevant rows are found. The larger the

"PHP Programming Fastest understand" seventh: PHP picture verification code and thumbnail

Example 22 core code for image validation Copy CodeThe code is as follows: <?php Header ("Content-type:image/png"); $num = ' 1234 '; $imagewidth = 60; $imageheight = 18; $numimage = Imagecreate ($imagewidth, $imageheight); Imagecolorallocate ($n

A simple Java visitor pattern

First, a primer For a completed class hierarchy in the system, we have provided it with an interface to meet the requirements. But what should we do in the face of new increases in demand? If this is

JSP Verification Code Encyclopedia of Digital Verification Code

Verification code applications in a variety of occasions, very wide, in a variety of systems or software in the new user account registration, user login, Web site unified Landing or users in the website published information module published article

PHP from zero single row (18) Image processing

1. Open a picture that already exists The parameter of the function Imagecreatefromjpeg () is the path where the file is located, and the return value is the resource identifier of the picture that the parameter refers to. This function creates

Guest Book with Oracle database paging display function

Most websites take into account the interaction with users. At this time, with the message version of the function, allows users to stay here, or some of the interaction with the site information.In the design, it can be very simple to leave only the

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