Delphi語言學習1-Program和Unit

1.單元和程序(Units和Programs)

1)Programs

program Editor;
  uses Forms, REAbout, // An "About" box
       REMain;         // Main form
  {$R *.res}
  begin
   Application.Title := 'Text Editor';
   Application.CreateForm(TMainForm, MainForm);
   Application.Run;
  end.

2）Unit

unit Unit1;
interface
uses // List of unit dependencies goes here
implementation
uses // List of unit dependencies goes here
// Implementation of class methods, procedures, and functions goes here
initialization
// Unit initialization code goes here
finalization
// Unit finalization code goes here
end.

2.引用Unit到Unit

uses Forms, Main;
uses 
   Forms,
   Main;
uses Windows, Messages, SysUtils, Strings, Classes, Unit2, MyUnit;

3.引用Unit到program or library

uses 
   Windows, Messages, SysUtils,
   Strings in 'C:\Classes\Strings.pas', Classes;

4.Unit間接引用

program Prog;
uses Unit2;
const a = b;
//...
unit Unit2;
interface
uses Unit1;
const b = c;
//...
unit Unit1;
interface
const c = 1;
//...

5.Unit的嵌套引用

unit Unit1;
interface
uses Unit2;
// ...
unit Unit2;
interface
uses Unit1;
// ...