免责声明:
这不会回答你如何排序字符串列表或如何将数据加载到一个字符串列表。它会为您提供一个哈希表,它比使用字符串列表更有效(40k名称,值与名称搜索配对)。
备选:
既然你有德尔福XE2,您可以使用泛型类TDictionary
。它将包含IP地址作为密钥和主机名称作为值。在显示了下面的代码,如何填补一个给定值的字典,以及如何搜索的值(主机名)(IP地址):
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Generics.Collections;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
IPList: TDictionary<string, string>;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
// create the TDictionary instance
IPList := TDictionary<string, string>.Create;
// here you will read your CSV file and add the items in a loop
// I've used here some of the major IP addresses for Sweden
IPList.Add('77.244.224.0', 'Insat Net AB');
IPList.Add('79.138.128.0', 'Hi3G Access AB');
IPList.Add('62.181.192.0', 'DGC Access AB');
IPList.Add('81.216.128.0', 'TDC Swerige AB');
IPList.Add('80.252.176.0', 'Phonera Networks AB');
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
// release a dictionary instance
IPList.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
HostName: string;
begin
// and how to search by the IP address and get the host name if found
if IPList.TryGetValue('81.216.128.0', HostName) then
ShowMessage(HostName)
else
ShowMessage('IP address not found!');
end;
end.
扩展:
的上面的解决方案,你可以简单地扩展到使用一个结构来存储不仅仅是一个主机名,例如也是一个主机位置:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Generics.Collections;
type
TIPData = record
HostName: string;
HostLocation: string;
end;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
private
IPList: TDictionary<string, TIPData>;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
var
IPData: TIPData;
begin
IPList := TDictionary<string, TIPData>.Create;
IPData.HostName := 'Broadnet Europe France';
IPData.HostLocation := 'France';
IPList.Add('78.155.128.0', IPData);
IPData.HostName := 'DNA Palvelut Oy';
IPData.HostLocation := 'Finland';
IPList.Add('62.113.160.0', IPData);
IPData.HostName := 'CD-Telematika a.s.';
IPData.HostLocation := 'Czech republic';
IPList.Add('89.203.128.0', IPData);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
IPList.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
IPData: TIPData;
begin
if IPList.TryGetValue('89.203.128.0', IPData) then
ShowMessage('Provider ' + IPData.HostName + ' from ' + IPData.HostLocation)
else
ShowMessage('IP address not found!');
end;
end.
很明显,CSV文件在IP和主机名之间有一个空格(被剪切掉) – asg2012 2012-08-14 14:21:27
您使用的是什么版本的Delphi?我要求让您的解决方案更好地优化(泛型)。你能编辑你的问题并添加你的Delphi版本作为下一个标签吗?无论如何,使用'TStringList'将会更好地使用'Name = Value'对,像'StringList [0]:='IPAddress = HostName''这样的模式。 – TLama 2012-08-14 14:30:01
TStringList绝对是错误的数据类型。您需要一个包含两个字符串字段IPAddress和HostName的记录。然后你想用TList来保存这些记录。 –
2012-08-14 14:39:25