关于端口冲突的问题，在线等解答！

Question

编程实现在预设端口被占用时，自动递加端口号，直到找到一个没有使用的端口。但是为什么一下代码不能实现这个功能！
ok是一boolean变量，
repeat
try
idudpserver1.Active:=true;
ok:=true;
except
  on EIdCouldNotBindSocket do
    begin
    inc(idudPServer1.DefaultPort);
    end;
end;
until ok;

Answer 1

repeat
try
idudpserver1.Active:=true;
ok:=true;
except
  on EIdCouldNotBindSocket do
    begin
    inc(idudPServer1.DefaultPort);
    ok:=False;    <----问题是不是这里？
    end;
end;
until ok;

Answer 2

晕看错了。试试这样repeat
try
idudpserver1.Active:=true;
ok:=true;
except
  on EIdCouldNotBindSocket do
    begin
      IdUDPServer1.Active:=false;
      IdUDPServer1.Bindings.Clear;
      ASocketHandle:=IdUDPServer1.Bindings.Add;
      ASocketHandle.Port:=1234;   //《－－这里自己处理加一    end;
end;
until ok;
asockethandle是TIDsocketHandle的对象

Answer 3

unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, IdBaseComponent, IdComponent, IdUDPBase, IdUDPServer, StdCtrls,idsockethandle;type
  TForm1 = class(TForm)
    Button1: TButton;
    IdUDPServer1: TIdUDPServer;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var ok:boolean ;
tempport:integer;
asockethandle:tidsockethandle;
begin
tempport:=idudpserver1.DefaultPort;
repeat
try
idudpserver1.Active:=true;
ok:=true;
except
  on EIdCouldNotBindSocket do
    begin
      IdUDPServer1.Active:=false;
      IdUDPServer1.Bindings.Clear;
      ASocketHandle:=IdUDPServer1.Bindings.Add;
      tempport:=tempport+1;
      ASocketHandle.Port:=tempport ;    end;
end;
until ok;
showmessage(inttostr(idudpserver1.Binding.Port));
end;end.
供参考