unit1.~pas

Delphi实效编程百例的随书源代码 这是其中的程序发布部分

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Registry, Dialogs;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
var
    registerTemp : TRegistry;
    curDate : TDateTime;
begin
    registerTemp := TRegistry.Create;
    with registerTemp do
    begin
        RootKey := HKEY_LOCAL_MACHINE;
        //判断是否初次运行程序
        if OpenKey('Software\MySoftware',True) then
        begin
{            if ReadBool('Runned') then
            //不是第一次运行
            begin
                curDate := Date;
                if (curDate-ReadTime('LastRunTime'))>=ReadInteger('Duration') then
                begin
                    //当前的系统时间超出了使用期限
                    ShowMessage('试用版已到期');
                    exit;
                end
                else
                begin
                    DeleteKey('LastRunTime');
                    WriteTime('LastRunTime',Date);
                end;
            end
            else
            begin
                //初次运行程序
                DeleteKey('Runned');
                WriteBool('Runned',True);
                //设置试用期限30天
                WriteInteger('Duration',30);
                //写入当前运行时间
                WriteTime('LastRunTime',Date);
            end;}
            WriteBool('Runned',False);            
        end
        else
        begin
            ShowMessage('Fails!');
        end;
        CloseKey;
    end;
end;

end.