用Delphi设计代理服务器[正确文章](2)

ErrorEvent: TErrorEvent; var ErrorCode: Integer);
procedure ClientSocket1Write(Sender: TObject;
Socket: TCustomWinSocket);
procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
procedure ServerSocket1Listen(Sender: TObject;
Socket: TCustomWinSocket);
procedure AppException(Sender: TObject; E: Exception);
procedure Timer1Timer(Sender: TObject);
private
{ Private declarations }
public
Service_Enabled: boolean; {代理服务是否开启}
session: array of session_record; {会话数组}
sessions: integer; {会话数}
LookUpTimeOut: integer; {连接超时值}
InvalidRequests: integer; {无效请求数}
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

file://系统启动定时器，启动窗显示完成后，缩小到System Tray…
procedure TForm1.Timer2Timer(Sender: TObject);
begin
timer2.Enabled:=false; {关闭定时器}
sessions:=0; {会话数=0}
Application.OnException := AppException; {为了屏蔽代理服务器出现的异常}
invalidRequests:=0; {0错误}
LookUpTimeOut:=60000; {超时值=1分钟}
timer1.Enabled:=true; {打开定时器}
n11.Enabled:=false; {开启服务菜单项失效}
n21.Enabled:=true; {关闭服务菜单项有效}
serversocket1.Port:=988; {代理服务器端口=988}
serversocket1.Active:=true; {开启服务}
form1.hide; {隐藏界面，缩小到System Tray上}
end;

file://开启服务菜单项…
procedure TForm1.N11Click(Sender: TObject);
begin
serversocket1.Active:=true; {开启服务}
end;

file://停止服务菜单项…
procedure TForm1.N21Click(Sender: TObject);
begin
serversocket1.Active:=false; {停止服务}
N11.Enabled:=True;
N21.Enabled:=False;
Service_Enabled:=false; {标志清零}
end;

file://主窗口建立…
procedure TForm1.FormCreate(Sender: TObject);
begin
Service_Enabled:=false;
timer2.Enabled:=true; {窗口建立时，打开定时器}
end;

file://窗口关闭时…
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
timer1.Enabled:=false; {关闭定时器}
if Service_Enabled then
serversocket1.Active:=false; {退出程序时关闭服务}
end;

file://退出程序按钮…
procedure TForm1.N01Click(Sender: TObject);
begin
form1.Close; {退出程序}
end;

file://开启代理服务后…
procedure TForm1.ServerSocket1Listen(Sender: TObject;
Socket: TCustomWinSocket);
begin
Service_Enabled:=true; {置正在服务标志}
N11.Enabled:=false;
N21.Enabled:=true;
end;

file://被代理端连接到代理服务器后，建立一个会话，并与套接字绑定…
procedure TForm1.ServerSocket1ClientConnect(Sender: TObject;
Socket: TCustomWinSocket);
var
i,j: integer;
begin
j:=-1;
for i:=1 to sessions do {查找是否有空白项}
if not session[i-1].Used and not session[i-1].CSocket.active then
begin
j:=i-1; {有，分配它}
session[j].Used:=true; {置为在用}
break;
end
else
if not session[i-1].Used and session[i-1].CSocket.active then
session[i-1].CSocket.active:=false;
if j=-1 then
begin {无，新增一个}
j:=sessions;
inc(sessions);
setlength(session,sessions);
session[j].Used:=true; {置为在用}
session[j].CSocket:=TClientSocket.Create(nil);
session[j].CSocket.OnConnect:=ClientSocket1Connect;
session[j].CSocket.OnDisconnect:=ClientSocket1Disconnect;
session[j].CSocket.OnError:=ClientSocket1Error;
session[j].CSocket.OnRead:=ClientSocket1Read;
session[j].CSocket.OnWrite:=ClientSocket1Write;
session[j].Lookingup:=false;
end;
session[j].SS_Handle:=socket.socketHandle; {保存句柄，实现绑定}
session[j].Request:=false; {无请求}
session[j].client_connected:=true; {客户机已连接}
session[j].remote_connected:=false; {远程未连接}
edit1.text:=inttostr(sessions);
end;

file://被代理端断开时…
procedure TForm1.ServerSocket1ClientDisconnect(Sender: TObject;
Socket: TCustomWinSocket);
var
i,j,k: integer;
begin
for i:=1 to sessions do
if (session[i-1].SS_Handle=socket.SocketHandle) and session[i-1].Used then
begin
session[i-1].client_connected:=false; {客户机未连接}
if session[i-1].remote_connected then
session[i-1].CSocket.active:=false {假如远程尚连接，断开它}
else
session[i-1].Used:=false; {假如两者都断开，则置释放资源标志}
break;
end;
j:=sessions;
k:=0;

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