全局变量的问题 请问在哪里定义全局变量和函数、过程?要整个工程都可以引用。定义完后,函数、工程体在哪里写?变量值在哪里赋?给个小程序最好 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 新建一個公用的Unit, 將全局的東西都寫在裹面, 其它, 要用到的就 uses 就可! 第一个unitunit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls;type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementationuses Unit2; //引用unit2{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);begin GetSystemVersion;end;end.第二个:unit Unit2;interfaceuses Dialogs;const SystemVersion = '1.0'; //(全局变量) //得到系统版本 (全局函数) procedure GetSystemVersion;implementationprocedure GetSystemVersion;begin Showmessage(SystemVersion);end;end.顺便作广告:(请求帮助)http://expert.csdn.net/Expert/topic/2440/2440285.xml?temp=.5369837 unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, DB, ADODB;type TForm1 = class(TForm) ADOQuery1: TADOQuery; Button1: TButton; Label1: TLabel; Label2: TLabel; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } Globle_str:string;//全局变量 function GetSysdate:TdateTime; // 全局函数 end;var Form1: TForm1;implementation{$R *.dfm}function TForm1.GetSysdate :tdatetime;begin adoquery1.Close; adoquery1.SQL.Clear ; adoquery1.SQL.Add('select sysdate from dual'); adoquery1.Open ; result:=adoquery1.fieldbyname('sysdate').AsDateTime ;end;在public中定义时候,必须全局变量在全局函数或过程前.在其它form应用时候,必须form1.Getsystem 在一个单元的interface和implementation之间定义的变量和说明的过程函数都是全局变量,全局过程、函数 高分,请问如何改变Toolbar上按钮的字体颜色? 多线程问题求助 搞笑帖:通化火车站检查笔记本电脑 一个考验高手的问题 紧急求助,在线等!!! 急!!! delphi7中作报表的控件在哪? 各位高手帮忙, 在线等待!!! 关于库存调拨成本计算的问题 有做过或想了解计件工资的兄弟,进来一看,...给个提示或例子,分不够再加.. 向周末坚守岗位的程序员问好!!!!我向各位请教!treeview 动态生成的效率 chm和e书的链接是怎样实现的? 如何在系统中注册一个Service Application程序?(在线) 请问如何用代码配置BDE?(数据库是sql server)
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementationuses Unit2; //引用unit2{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
GetSystemVersion;
end;end.
第二个:unit Unit2;interfaceuses
Dialogs;const
SystemVersion = '1.0'; //(全局变量) //得到系统版本 (全局函数)
procedure GetSystemVersion;
implementationprocedure GetSystemVersion;
begin
Showmessage(SystemVersion);
end;end.
顺便作广告:(请求帮助)
http://expert.csdn.net/Expert/topic/2440/2440285.xml?temp=.5369837
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, DB, ADODB;type
TForm1 = class(TForm)
ADOQuery1: TADOQuery;
Button1: TButton;
Label1: TLabel;
Label2: TLabel;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
Globle_str:string;//全局变量
function GetSysdate:TdateTime; // 全局函数
end;var
Form1: TForm1;
implementation{$R *.dfm}
function TForm1.GetSysdate :tdatetime;
begin
adoquery1.Close;
adoquery1.SQL.Clear ;
adoquery1.SQL.Add('select sysdate from dual');
adoquery1.Open ;
result:=adoquery1.fieldbyname('sysdate').AsDateTime ;
end;
在public中定义时候,必须全局变量在全局函数或过程前.
在其它form应用时候,必须form1.Getsystem