给你一个异步扫描端口的代码: unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls,WInSock, ExtCtrls;const WM_SOCKET=WM_USER+1; //socket消息type TForm1 = class(TForm) Button1: TButton; Edit1: TEdit; Panel1: TPanel; Memo1: TMemo; procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure Button3Click(Sender: TObject); private Sockhd : integer; //socket句柄 Serv_Addr : Tsockaddr;//目标地址 procedure SockEvent(var msg: Tmessage);message WM_SOCKET; //处理cocket消息 procedure DspMsg(msg : string); //显示信息 { Private declarations } public { Public declarations } end; Form1: TForm1;implementation {$R *.DFM}function lookup_hostname(const hostname:string):longint; //把域名转化成IP地址 var RemoteHost : PHostEnt; (* no, don't free it! *) ip_address: longint; begin ip_address:=-1; try if hostname='' then begin (* no host given! *) lookup_hostname:=ip_address; EXIT; end else begin ip_address:=Winsock.Inet_Addr(PChar(hostname)); (* try a xxx.xxx.xxx.xx first *) if ip_address=SOCKET_ERROR then begin RemoteHost:=Winsock.GetHostByName(PChar(hostname)); if (RemoteHost=NIL) or (RemoteHost^.h_length<=0) then begin lookup_hostname:=ip_address; EXIT; (* host not found *) end else ip_address:=longint(pointer(RemoteHost^.h_addr_list^)^); end; end; except ip_address:=-1; end; lookup_hostname:=ip_address; end;procedure TFOrm1.DspMsg(msg: string); begin memo1.Lines.Add(msg+'...'); if Memo1.Lines.Count>200 then Memo1.Lines.Delete(0); end;procedure TForm1.SockEvent(var msg : tmessage); //处理socket消息 begin case msg.LParam of FD_READ: begin //标识可以读数据,当然肯定已经链接上了 dspmsg('可以读取数据'); //do what you want do end; FD_WRITE: begin dspmsg('可以发送数据'); //do what you want do end; FD_ERROR: begin dspmsg('发生错误'); //如果你是客户端,则应该是连接不上,即端口没有开 end; FD_CLOSE: Begin dspmsg('服务器断开连接'); //对方关闭连接 end; FD_CONNECT: begin dspmsg('连结上服务器'); //表示对方端口开放 end; FD_ACCEPT: begin dspmsg('接收一个请求'); //这个消息只有服务端可能出现 end; end; end;procedure TForm1.FormCreate(Sender: TObject); var wsaData:TwsaData; begin //启动winsock动态链接库 if WSAStartup (makeword(2,2), wsaData)<>0 then begin messagebox(application.handle,'无法启动winsock动态连接库!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING); Application.Terminate; end; end;procedure TForm1.FormDestroy(Sender: TObject); begin //关闭dll WSACleanup; end;procedure TForm1.Button1Click(Sender: TObject); begin Sockhd := socket(AF_INET,SOCK_STREAM,0); //创建socket句柄 if Sockhd<0 then begin messagebox(application.handle,'无法创建句柄!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING); exit; end; Serv_addr.sin_addr.s_addr:= lookup_hostname(edit1.Text); //主机名 Serv_addr.sin_family := PF_INET; Serv_addr.sin_port := htons(23); //any port you want to connect if WSAAsyncSelect(Sockhd,Form1.handle,WM_SOCKET,FD_ACCEPT or FD_CONNECT or FD_CLOSE or FD_READ or FD_WRITE)=SOCKET_ERROR then begin messagebox(application.handle,'无法创建句柄!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING); exit; end; //异步socket connect(sockhd,serv_addr,sizeof(serv_addr)); //连接,结果会在前面的处理函数处理 end;end.
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls,WInSock, ExtCtrls;const WM_SOCKET=WM_USER+1; //socket消息type
TForm1 = class(TForm)
Button1: TButton;
Edit1: TEdit;
Panel1: TPanel;
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
Sockhd : integer; //socket句柄
Serv_Addr : Tsockaddr;//目标地址 procedure SockEvent(var msg: Tmessage);message WM_SOCKET; //处理cocket消息
procedure DspMsg(msg : string); //显示信息
{ Private declarations }
public
{ Public declarations }
end; Form1: TForm1;implementation
{$R *.DFM}function lookup_hostname(const hostname:string):longint; //把域名转化成IP地址
var
RemoteHost : PHostEnt; (* no, don't free it! *)
ip_address: longint;
begin
ip_address:=-1;
try
if hostname='' then
begin (* no host given! *)
lookup_hostname:=ip_address;
EXIT;
end
else
begin
ip_address:=Winsock.Inet_Addr(PChar(hostname)); (* try a xxx.xxx.xxx.xx first *)
if ip_address=SOCKET_ERROR then begin
RemoteHost:=Winsock.GetHostByName(PChar(hostname));
if (RemoteHost=NIL) or (RemoteHost^.h_length<=0) then
begin
lookup_hostname:=ip_address;
EXIT; (* host not found *)
end
else
ip_address:=longint(pointer(RemoteHost^.h_addr_list^)^);
end;
end;
except
ip_address:=-1;
end;
lookup_hostname:=ip_address;
end;procedure TFOrm1.DspMsg(msg: string);
begin
memo1.Lines.Add(msg+'...');
if Memo1.Lines.Count>200 then Memo1.Lines.Delete(0);
end;procedure TForm1.SockEvent(var msg : tmessage); //处理socket消息
begin
case msg.LParam of
FD_READ: begin //标识可以读数据,当然肯定已经链接上了
dspmsg('可以读取数据');
//do what you want do
end; FD_WRITE: begin
dspmsg('可以发送数据');
//do what you want do
end; FD_ERROR: begin
dspmsg('发生错误');
//如果你是客户端,则应该是连接不上,即端口没有开
end; FD_CLOSE: Begin
dspmsg('服务器断开连接');
//对方关闭连接
end; FD_CONNECT: begin
dspmsg('连结上服务器');
//表示对方端口开放
end; FD_ACCEPT: begin
dspmsg('接收一个请求');
//这个消息只有服务端可能出现
end;
end;
end;procedure TForm1.FormCreate(Sender: TObject);
var wsaData:TwsaData;
begin //启动winsock动态链接库
if WSAStartup (makeword(2,2), wsaData)<>0 then begin
messagebox(application.handle,'无法启动winsock动态连接库!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING);
Application.Terminate;
end;
end;procedure TForm1.FormDestroy(Sender: TObject);
begin //关闭dll
WSACleanup;
end;procedure TForm1.Button1Click(Sender: TObject);
begin
Sockhd := socket(AF_INET,SOCK_STREAM,0); //创建socket句柄
if Sockhd<0 then begin
messagebox(application.handle,'无法创建句柄!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING);
exit;
end;
Serv_addr.sin_addr.s_addr:= lookup_hostname(edit1.Text); //主机名
Serv_addr.sin_family := PF_INET;
Serv_addr.sin_port := htons(23); //any port you want to connect if WSAAsyncSelect(Sockhd,Form1.handle,WM_SOCKET,FD_ACCEPT or FD_CONNECT or FD_CLOSE or FD_READ or FD_WRITE)=SOCKET_ERROR
then begin
messagebox(application.handle,'无法创建句柄!','警告',MB_OK or MB_APPLMODAL or MB_ICONWARNING);
exit;
end; //异步socket
connect(sockhd,serv_addr,sizeof(serv_addr)); //连接,结果会在前面的处理函数处理
end;end.