欢迎进入C/C++编程社区论坛,与300万技术人员互动交流 >>进入 1、创建向导对话框 在使用具体某个软件的时候,我们常常会在该程序中使用向导模式来建立新的文件,最典型的例子就是在Frontpage2000中或者Word2000中使用向导方式来新建一个网页文件或者Word文档
欢迎进入C/C++编程社区论坛,与300万技术人员互动交流 >>进入
1、创建向导对话框
在使用具体某个软件的时候,我们常常会在该程序中使用向导模式来建立新的文件,最典型的例子就是在Frontpage2000中或者Word2000中使用向导方式来新建一个网页文件或者Word文档
。那么看到别的程序都能提供人性化的向导对话框后,不知您有没有什么冲动?如果有的话,不妨使用下面的代码来创建一个向导对话框:
void CMy56_s1Dlg::OnWiz() { CSheet sheet; sheet.SetWizardMode(); int iRet=sheet.DoModal();//返回ID_WIZFINISH或IDCANCEL } //重载BOOL CPropertyPage::OnSetActive( )来控制显示的按钮 BOOL CPage1::OnSetActive() { ((CPropertySheet*)GetParent())->SetWizardButtons(PSWIZB_BACK|PSWIZB_NEXT); return CPropertyPage::OnSetActive(); } BOOL CPage2::OnSetActive() { ((CPropertySheet*)GetParent())->SetWizardButtons(PSWIZB_BACK|PSWIZB_FINISH); return CPropertyPage::OnSetActive(); } |
2、在计算机之间实现收发数据
大家知道,计算机之间相互通信时,一般都是通过TCP协议来与指定IP地址的主机来建立联系,并进行相互通信的,在这个过程中,必需有一方扮演服务器的角色等待另一方(客户端)的连接请求,所以服务器端需要建立一个监听套接口,然后在此套接口上等待连接。当连接建立后会产生一个新的套接口用于通信。而客户端在创建套接口后只需要简单的调用连接函数就可以创建连接。对于有连接的通信不论是数据的发送还是发送与接收的顺序都是有保证的。下面的代码就是利用VC++提供的CSocket来实现数据收发功能的:
/* 服务器方在端口6802上等待连接,当连接建立后关闭监听套接口 客户方向服务器端口6802发起连接请求 */ BOOL CMy63_s1_serverDlg::OnInitDialog() { CDialog::OnInitDialog(); CSocket sockListen; //创建本地套接口 sockListen.Create(6802,SOCK_STREAM,"127.0.0.1"); //绑定参数 sockListen.Bind(6802,"127.0.0.1"); sockListen.Listen(5); //等待连接请求,m_sockSend为成员变量,用于通信 sockListen.Accept(m_sockSend); //关闭监听套接口 sockListen.Close(); //启动定时器,定时发送数据 SetTimer(1,3000,NULL); } |
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InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software