2020年Delphi快速语法参考手册：精要指南

Delphi

31 浏览量更新于2024-06-13 收藏 1.38MB PDF 举报

身份认证购VIP最低享 7 折!

30元优惠券

资源详情

资源推荐

Compilation toNative Code

The final artifact of compilation of Delphi code is binary files with native

code. In computing, this means that the final files represent machine code

instead of an intermediate form like the one you find in virtual machine

bytecode other languages produce. As a result, the executables run directly

on top of the operating system without any translation layers between the

executables and the underlying APIs of the operating systems.

Visual Applications

Delphi provides two out-of-the-box frameworks to support the

development of visual applications: the Visual Component Library (VCL)

and, starting from Delphi XE2, the FireMonkey (FMX) framework. VCL

is used for Windows applications only, and FMX provides cross-platform

components to build graphical user interfaces. Apart from VCL and FMX,

there are third-party frameworks and libraries available to enrich the

development of visual applications.

One Code Base forMultiple Platforms

One of the most distinguished characteristics of modern Delphi is the

ability to produce binaries for multiple platforms from the same code base.

At the time of writing, there are very few development tools in the market

that truly support this. This means that, as a developer, you write code

without any considerations as to which platform it will compile to, and

Delphi takes the task to produce the appropriate executables or libraries

for the platform of your choice. Currently, Delphi supports the following

platforms: Windows 32-bit, Windows 64-bit, macOS 32-bit, macOS 64-bit,

Android 32-bit, Android 64-bit, iOS, iOS 32-bit, iOS 64-bit, iOS Simulator,

CHAPTER 1 DELPHI PASCAL

Units

You can, very easily, create one big file and store all your code in it (with

the exception of visual elements like forms and frames). Delphi will not

complain and will compile your code correctly. However, this does not

sound something that scales up easily when you write complex software.

Instead, common practice suggests to organize your code in smaller

separate files or modules as they are known in software engineering.

Delphi is a modular language and provides support to modules via

unit files. In Pascal world, the term unit is used instead of module. The

term module still exists in Delphi, and it refers to a special component

(TDataModule) which sits in its own separate unit file. A unit is a separate

code file, it has the .pas extension, and it is linked back to the project

and is compiled to a binary file with the extension .dcu. DCUs are more

important than the source code files because the compiler is able to use

a .dcu file without the need to locate and access the corresponding .pas

file. The downside is that DCU files are tightly linked to the version of the

compiler that was used to create them. There were some exceptions in the

past, but this is the general rule.

The following snippet shows the minimum elements you can find in

a unit file (which, basically, does nothing). There are two distinct parts—

interface and implementation. The interface section is the part of the

unit that is visible to other units. For example, if you declare a variable in

this section, it will be accessible to any other units that refer to this unit. On

the other hand, any declarations made in the implementation section are

only available in this unit and not outside it. When it comes to OOP, classes

are typically declared in the interface section, and any method code

should appear in the implementation section in the same unit. Of course,

you can have the declaration and implementation of a class solely in the

implementation section, but it will be accessible only within the unit.

CHAPTER 1 DELPHI PASCAL

剩余117页未读，继续阅读

0x0007

粉丝: 3597
资源: 457

2020年Delphi快速语法参考手册：精要指南

Anaconda3-2020.11-Linux-x86_64.sh

Apress - CSS3 Quick Syntax Reference, 2nd.2019.epub

Csharp.8.Quick.Syntax.Reference.3rd.Edition_2020.pdf

var element = document.querySelectorAll("#app > div > div.main-container > section > div > div.flex-row.mt-2 > div > div.el-select.mr-1.statusStyle.mt-1.select-style > div.el-input.el-input--suffix > input")) 报错：Uncaught SyntaxError: Unexpected token ')'

Error: arch/arm/boot/dts/suniv-f1c100s-licheepi-nano.dts:22.13-19 syntax error FATAL ERROR: Unable to parse input tree make[1]: *** [scripts/Makefile.lib:296：arch/arm/boot/dts/suniv-f1c100s-licheepi-nano.dtb] 错误 1 make: *** [Makefile:1277：suniv-f1c100s-licheepi-nano.dtb] 错误 2

mongodb_exporter: error: unknown flag --config.file

-bash: hdfs-site.xml: line 1: syntax error near unexpected token `newline' -bash: hdfs-site.xml: line 1: `<?xml version="1.0" encoding="UTF-8"?>'有什么错

python get-pip.py SyntaxError: invalid syntax

jquery-1.8.3.js:4 Uncaught SyntaxError: Unexpected token '<'

job for rc-local.service faile

[fatal error] core-site.xml:22:2: the markup in the document following the r

Uncaught SyntaxError: Unexpected token '<' (at jsPlugin-1.0.0.min.js:2:1)

Input In [211] from scikit-learn.linear_model import LinearRegression ^ SyntaxError: invalid syntax

>>> conda create --prefix ./myenv python=3.8 File "<stdin>", line 1 conda create --prefix ./myenv python=3.8 ^^^^^^ SyntaxError: invalid syntax >>>

Cannot find module test/components/uni-list/uni-list.vue

（备份）README-PROJECT-1.pdf

File "<stdin>", line 1 python get-pip.py ^^^ SyntaxError: invalid syntax

Syntax in assignment statement l-value.

chunk-vendors.js:1 Uncaught SyntaxError: Unexpected token '<' (at

local-storage.ts:26 Uncaught SyntaxError: Unexpected token ? node 版本为18.20.0

最新资源

Error: arch/arm/boot/dts/suniv-f1c100s-licheepi-nano.dts:22.13-19 syntax error FATAL ERROR: Unable to parse input tree make[1]: * [scripts/Makefile.lib:296：arch/arm/boot/dts/suniv-f1c100s-licheepi-nano.dtb] 错误 1 make: * [Makefile:1277：suniv-f1c100s-licheepi-nano.dtb] 错误 2