unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, IdAntiFreezeBase, IdAntiFreeze, IdTCPConnection,
  IdTCPClient, IdBaseComponent, IdComponent, IdTCPServer,StrUtils;

type
  TForm1 = class(TForm)
    itsTalk: TIdTCPServer;
    itcTalk: TIdTCPClient;
    iafTalk: TIdAntiFreeze;
    GroupBox1: TGroupBox;
    memoSystemInfo: TMemo;
    GroupBox2: TGroupBox;
    editPort: TEdit;
    btnBegin: TButton;
    btnEnd: TButton;
    Label1: TLabel;
    GroupBox3: TGroupBox;
    lbUser: TListBox;
    GroupBox4: TGroupBox;
    memoTalkInfo: TMemo;
    GroupBox5: TGroupBox;
    Button1: TButton;
    Button2: TButton;
    procedure itsTalkConnect(AThread: TIdPeerThread);
    procedure itsTalkExecute(AThread: TIdPeerThread);
    procedure btnBeginClick(Sender: TObject);
    procedure btnEndClick(Sender: TObject);
    procedure memoTalkInfoChange(Sender: TObject);
    procedure updateip();
    procedure updateuserip();
    procedure closeserver();
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  acceptstr:string;
  sendid:string;
  PeerIP:string;

implementation

{$R *.dfm}

procedure TForm1.itsTalkConnect(AThread: TIdPeerThread);
begin
memoSystemInfo.Lines.Add(DateTimeToStr(Now())+'：'+Athread.Connection.Socket.Binding.PeerIP+'已經連接到服務器！');
Athread.Connection.WriteLn(' 歡迎連接紫青局域網聊天服務器！');
lbUser.Items.Add(Athread.Connection.Socket.Binding.PeerIP);
//Athread.Connection.WriteLn(lbUser.Items.CommaText);
updateuserip();
end;
procedure TForm1.updateuserip();
var
i:integer;
begin
for i:=0 to lbUser.Count-1 do
begin
itcTalk.Host:=lbUser.Items[i];
itcTalk.Port:=6061;
itcTalk.Connect(500);
itcTalk.WriteLn('p'+lbUser.Items.CommaText);
itcTalk.Disconnect();
end;
end;
procedure TForm1.updateip();
var
i:integer;
begin
for i:=0 to lbUser.Count-1 do
begin
if lbUser.Items[i]=PeerIP then
begin
lbUser.Items.Delete(i);
exit;
end;
end;
updateuserip();
end;
procedure TForm1.itsTalkExecute(AThread: TIdPeerThread);
begin
acceptstr:=Athread.Connection.ReadLn();
PeerIP:=AThread.Connection.Socket.Binding.PeerIP;
if SameText(acceptstr,'QUIT') then
begin
memoSystemInfo.Lines.Add(DateTimeToStr(Now())+' ：'+PeerIP+'退出服務器！');
updateip();
end
else
begin
sendid:=Leftstr(acceptstr,AnsiPos('，',acceptstr)-1);//通過AnsiPos(const Substr, S: string)返回子串Substr出現在主串S中的第一個位置
memoSystemInfo.Lines.Add(DateTimeToStr(Now())+'：'+AThread.Connection.Socket.Binding.PeerIP+' 發送消息給 '+sendid);
memoTalkInfo.Lines.Add(DateTimeToStr(Now())+'：'+AThread.Connection.Socket.Binding.PeerIP+' 微笑地說：'+acceptstr);
Athread.Connection.WriteLn('發送成功！');
end;
end;

procedure TForm1.btnBeginClick(Sender: TObject);
begin
itsTalk.DefaultPort:=strtoint(editPort.Text);
itsTalk.Active:=true;
btnBegin.Enabled:=false;
btnEnd.Enabled:=true;
memoSystemInfo.Lines.Add(DateTimeToStr(Now())+'：'+'服務器已經啟動！');
end;
procedure TForm1.closeserver();
var
i:integer;
begin
for i:=0 to lbUser.Count-1 do
begin
itcTalk.Host:=lbUser.Items[i];
itcTalk.Port:=6061;
itcTalk.Connect(500);
itcTalk.WriteLn('q'+lbUser.Items.CommaText);
itcTalk.Disconnect();
end;
end;

procedure TForm1.btnEndClick(Sender: TObject);
begin
closeserver();
itsTalk.Active:=false;
btnBegin.Enabled:=true;
btnEnd.Enabled:=false;
memoSystemInfo.Lines.Add(DateTimeToStr(Now())+'：'+'服務器已經停止！');
end;

procedure TForm1.memoTalkInfoChange(Sender: TObject);
begin
itcTalk.Host:=sendid;
itcTalk.Port:=6061;
itcTalk.Connect(500);
memoSystemInfo.Lines.Add(itcTalk.ReadLn());
itcTalk.WriteLn(PeerIP+' 微笑地對你說：'+acceptstr);
itcTalk.Disconnect();
end;
end.