Programmer Think

This program is a Demo written, including a main form and a data module 1. The main window is designed as follows: Provide an initialization, a query, and a release Initialization is used for data module instantiation. Query is to execute SQL statements, and release is to release data module instances Nothing else to say At the top of the form ...

Custom parent class The parent class is the main manifestation of each dynamically created control. This design is implemented by inheriting the TGraphicControl class. In addition to expanding the conventional properties such as position and size, it also imitates the TShape class, declares Canvas inside the class to realize the display of ...

This code was originally created by blogger Huang Renlai. For reprint, please indicate the source: https://blog.csdn.net/weixin_43334745 2018-10-05  Recently, I am learning C, deeply aware of the power (and danger) of the C pointer. If I master it well, I will control the memory like a fish in water; if I master it badly, I ...

I. constant 1. Constant definition: the value defined at the beginning is not allowed to be changed during the operation of the program 1 const 2 pi: Double = 3.141592; / / defined as constant 3 {constant can be defined without type declaration. Compiler will determine the type of constant} according to specific value 4 Pi2 = 3.1415;   2. ...

1. Transfer payment process: Step 1: create an app and get APPID Open platform to ant golden clothing( open.alipay.com )To create an application in the developer center, an app unique ID (APPID) will be generated and the payment function will be applied for.. Step 2: configure the key The Alipay public key: Alipay's RSA public key. The ...

Delphi calls external programs and blocks them into external programs Background note: Some time ago, a data conversion system was developed. The business logic stated that the data needed to be compressed into. tar.gz format. I use Windows system, Mr. batch file processing, and then call WinExec to execute batch file, sleep and wait for a p ...

Catalog 1. overview 2. Message queue API msgget msgsnd msgrcv msgctl 3. Simple procedures code implementation common.h msgcreate.c msgsnd.c msgrcv.c msgrmid.c Code testing 1. overview System V message qu ...

Assignment 2: Multilevel menu (1) Three-level menu (2) You can choose to enter each sub-menu at the next time. (3) Necessary New Knowledge Points: Lists, Dictionaries Requirements: Input b returns to the upper level, input q exits the whole program   Thought: The first level of the three-level menu is province, the second level is city, and the ...

C Program Experiment Report Experiments: 1. Application of one-dimensional arrays 2. Application of two-dimensional arrays 3. Application of Character Array Name: Chen Fuzhou Experimental Place: 514 Classroom of Teaching Building Experimental Time: 2019.5.29 1. Experimental Purpose and Requirements 1. Master the definition of one-dim ...