来自：Another_eYes 时间：99-8-29 21:55:08 ID:129673
用个ICMP控件直接在程序里ping吧
不用控件也简单. 用api一样
uses winsock; p_ip_options=^t_ip_options;
t_ip_options=packed record
Ttl: byte;
Tos: byte;
flags: byte;
optionssize: byte;
optionsdata: pointer;
end; p_icmp_echo_reply=^t_icmp_echo_reply;
t_icmp_echo_reply=packed record
address: u_long;
status: u_long;
rttime: u_long;
datasize: word;
reserved: word;
data: pointer; ip_options:t_ip_options;
end; function icmpcreatefile: THandle; stdcall; external 'icmp.dll' name 'ICMPCreateFile'; function ICMPSendEcho:function(ICMPHandle: THandle;
DestAddress:longint;
Requestdata:pointer;
requestsize:word;
RequestOptns: p_ip_options;
ReplyBuffer:pointer;
Replysize:dword;
Timeout: DWord ):dword; stdcall; external 'icmp.dll' name 'ICMPSendEcho'; function ICMPCloseHandle:function(ICMPHandle:THandle):Boolean; stdcall; external 'icmp.dll' name 'ICMPCloseHandle'; function Ping(Ip: string): boolean;
var
f_ICMP_Handle: THandle;
f_address: LongInt;
f_timeout: Integer;
f_blocksize: Integer;
f_replysize: Integer;
requestoptions: T_ip_options;
reqyestdatam replybuffer: Pointer;
begin
f_ICMP_Handle:=icmpcreatefile;
f_timeout:=1000; f_blocksize:=64;
f_replysize:=16+sizeof(t_icmp_echo_reply)+f_blocksize;
GetMem(requestdata,f_blocksize);
fillchar(requestdata^,64,#$32);
GetMem(replybuffer,f_replysize);
requestoptions.ttl:=255;
requestoptions.tos:=0;
requestoptions.flags:=0;
requestoptions.optionssize:=0;
requestoptions.optionsdata:=NIL;
f_address := Inet_Addr(PChar(Ip)); if f_address = SOCKET_ERROR then
begin
result := false;
ICMPCloseHandle(f_icmp_handle);
exit;
end; if ICMPSendEcho(f_icmp_handle,f_address,
requestdata,f_blocksize, @requestoptions,
replybuffer,f_replysize,
f_timeout)<>1 then
result := false
else
result := true;
icmpclosehandle(f_icmp_handle);
end; 来自：曹晓钢 时间：99-8-31 02:35:06 ID:130028
这个问题不是刚讨论过吗?
pega说,
监视本机IP的变化,如果挂上了internet,就会多出一个新的IP来.
(是局域网就歇菜了.)
还有老外由这个思路写了控件了.不长,我就直接贴出来了. { ****************************************************************** }
{ }
{ VCL component TKZInternetDetect } { }
{ Internet detector component }
{ }
{ Code generated by Component Create for Delphi }
{ }
{ Generated from source file d:\compon~1\intern~1\d3\kzintdet.cd }
{ on 7 July 1999 at 21:52 }
{ }
{ Copyright ?1999 by Kire Zvezdakoski }
{ }
{ ****************************************************************** } unit KZIntDet; interface uses Messages, SysUtils, Classes, Controls, Forms, Graphics,
Windows, Extctrls, RAS; type
TKZInternetDetect = class(TComponent)
private
{ Private fields of TKZInternetDetect }
FCheckInterval : Integer;
FConnected : Boolean;
FIP : String;
{ Pointer to application's OnConnect handler, if any }
FOnConnect : TNotifyEvent;
{ Pointer to application's OnDisconnect handler, if any }
FOnDisconnect : TNotifyEvent;
Timer : TTimer; { Private methods of TKZInternetDetect }
{ Method to set variable and property values and create objects }
procedure AutoInitialize;
{ Method to free any objects created by AutoInitialize }
procedure AutoDestroy; procedure SetConnected(Value : Boolean);
procedure SetIP(Value : String);
procedure Check(Sender:TObject); protected
{ Protected fields of TKZInternetDetect } { Protected methods of TKZInternetDetect }
{ Method to generate OnConnect event }
procedure Connect(Sender : TObject); virtual;
{ Method to generate OnDisconnect event }
procedure Disconnect(Sender : TObject); virtual;
procedure Loaded; override; public
{ Public fields and properties of TKZInternetDetect } { Public methods of TKZInternetDetect } constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function Execute : Boolean; published
{ Published properties of TKZInternetDetect }
property OnConnect : TNotifyEvent read FOnConnect write FOnConnect;
property OnDisconnect : TNotifyEvent read FOnDisconnect write FOnDisconnect;
property CheckInterval : Integer
read FCheckInterval write FCheckInterval
default 1000;
property Connected : Boolean
read FConnected write SetConnected
default False;
property IP : String read FIP write SetIP; end; procedure Register; implementation procedure Register;
begin
{ Register TKZInternetDetect with KireZ as its
default page on the Delphi component palette }
RegisterComponents('KireZ', [TKZInternetDetect]);
end; { Method to set variable and property values and create objects }
procedure TKZInternetDetect.AutoInitialize;
begin
Timer := TTimer.Create(Self);
FCheckInterval := 1000;
FConnected := False;
FIP := '127.0.0.1';
end; { of AutoInitialize } { Method to free any objects created by AutoInitialize }
procedure TKZInternetDetect.AutoDestroy;
begin
Timer.Free;
end; { of AutoDestroy } procedure TKZInternetDetect.SetConnected(Value : Boolean); begin
FConnected := Value;
end; procedure TKZInternetDetect.SetIP(Value : String);
begin
FIP := Value;
end; { Method to generate OnConnect event }
procedure TKZInternetDetect.Connect(Sender : TObject);
begin
{ Has the application assigned a method to the event, whether
via the Object Inspector or a run-time assignment? If so,
execute that method }
if Assigned(FOnConnect) then
FOnConnect(Sender);
end; { Method to generate OnDisconnect event }
procedure TKZInternetDetect.Disconnect(Sender : TObject);
begin
{ Has the application assigned a method to the event, whether
via the Object Inspector or a run-time assignment? If so,
execute that method }
if Assigned(FOnDisconnect) then
FOnDisconnect(Sender);
end; procedure TKZInternetDetect.Check(Sender:TObject); var
RASConns:TRasConn;
dwSize:dword;
dwCount:dword;
RASpppIP:TRASpppIP;
T:Boolean;
r:string;
begin
r:='';
RASConns.dwSize:=SizeOf(TRASConn);
RASpppIP.dwSize:=SizeOf(RASpppIP);
dwSize:=SizeOf(RASConns);
If RASEnumConnections(@RASConns, dwSize, dwCount)=0 Then If dwCount > 0 Then begin
dwSize := SizeOf(RASpppIP);
If RASGetProjectionInfo(RASConns.hRasConn, RASP_PPPIP, @RasPPPIP, dwSize)=0 Then
r:=strPas(RASpppIP.szIPAddress);
End;
t:=Connected;
Connected:=(r<>'127.0.0.1') and (r<>'') and (r<>' ');
FIP:=r;
if ((not t) and Connected) then Connect(Sender);
if (t and (not Connected)) then Disconnect(Sender);
end; constructor TKZInternetDetect.Create(AOwner: TComponent); begin
inherited Create(AOwner);
AutoInitialize; { Code to perform other tasks when the component is created }
Timer.OnTimer:=Check;
CheckInterval:=1000;
end; destructor TKZInternetDetect.Destroy;
begin
AutoDestroy;
inherited Destroy;
end; function TKZInternetDetect.Execute : Boolean;
begin
{ Perform the component operation } { Return True if the operation was successful, False otherwise }
Result := True
end; procedure TKZInternetDetect.Loaded;
begin
inherited Loaded; { Perform any component setup that depends on the property values having been set } end;
end.
来自：DNChen 时间：99-8-31 07:30:18 ID:130040
>2. windows登陆internet后,使用什麽消息变量传递的.我可否使用
没有消息可以响应，只有你自己的程序拨号时，才可以提供一个回调函数给ras api，
这个时候才可以获得拨号成功/失败信息。 来自：cytown 时间：99-8-31 17:53:46 ID:130196
可以通过ping www.netscape.com是否通来判断, 不过, 如果你的局域网
有一个机器或服务器是WWW.NETSCAPE.COM, 那么......
话说回来了, 谁会设这么一台机器呢? 可以用ics构件里的tping构件. 来自：Kim Wong 时间：99-8-31 22:50:32 ID:130290
使用 idle 是否会比用 timer 节约资源呢？
不过我以前就是用 timer 来实现的一个记费器，并没感觉事件响应有迟缓。
其实 timer 也不是太占资源啦！
用个ICMP控件直接在程序里ping吧
不用控件也简单. 用api一样
uses winsock; p_ip_options=^t_ip_options;
t_ip_options=packed record
Ttl: byte;
Tos: byte;
flags: byte;
optionssize: byte;
optionsdata: pointer;
end; p_icmp_echo_reply=^t_icmp_echo_reply;
t_icmp_echo_reply=packed record
address: u_long;
status: u_long;
rttime: u_long;
datasize: word;
reserved: word;
data: pointer; ip_options:t_ip_options;
end; function icmpcreatefile: THandle; stdcall; external 'icmp.dll' name 'ICMPCreateFile'; function ICMPSendEcho:function(ICMPHandle: THandle;
DestAddress:longint;
Requestdata:pointer;
requestsize:word;
RequestOptns: p_ip_options;
ReplyBuffer:pointer;
Replysize:dword;
Timeout: DWord ):dword; stdcall; external 'icmp.dll' name 'ICMPSendEcho'; function ICMPCloseHandle:function(ICMPHandle:THandle):Boolean; stdcall; external 'icmp.dll' name 'ICMPCloseHandle'; function Ping(Ip: string): boolean;
var
f_ICMP_Handle: THandle;
f_address: LongInt;
f_timeout: Integer;
f_blocksize: Integer;
f_replysize: Integer;
requestoptions: T_ip_options;
reqyestdatam replybuffer: Pointer;
begin
f_ICMP_Handle:=icmpcreatefile;
f_timeout:=1000; f_blocksize:=64;
f_replysize:=16+sizeof(t_icmp_echo_reply)+f_blocksize;
GetMem(requestdata,f_blocksize);
fillchar(requestdata^,64,#$32);
GetMem(replybuffer,f_replysize);
requestoptions.ttl:=255;
requestoptions.tos:=0;
requestoptions.flags:=0;
requestoptions.optionssize:=0;
requestoptions.optionsdata:=NIL;
f_address := Inet_Addr(PChar(Ip)); if f_address = SOCKET_ERROR then
begin
result := false;
ICMPCloseHandle(f_icmp_handle);
exit;
end; if ICMPSendEcho(f_icmp_handle,f_address,
requestdata,f_blocksize, @requestoptions,
replybuffer,f_replysize,
f_timeout)<>1 then
result := false
else
result := true;
icmpclosehandle(f_icmp_handle);
end; 来自：曹晓钢 时间：99-8-31 02:35:06 ID:130028
这个问题不是刚讨论过吗?
pega说,
监视本机IP的变化,如果挂上了internet,就会多出一个新的IP来.
(是局域网就歇菜了.)
还有老外由这个思路写了控件了.不长,我就直接贴出来了. { ****************************************************************** }
{ }
{ VCL component TKZInternetDetect } { }
{ Internet detector component }
{ }
{ Code generated by Component Create for Delphi }
{ }
{ Generated from source file d:\compon~1\intern~1\d3\kzintdet.cd }
{ on 7 July 1999 at 21:52 }
{ }
{ Copyright ?1999 by Kire Zvezdakoski }
{ }
{ ****************************************************************** } unit KZIntDet; interface uses Messages, SysUtils, Classes, Controls, Forms, Graphics,
Windows, Extctrls, RAS; type
TKZInternetDetect = class(TComponent)
private
{ Private fields of TKZInternetDetect }
FCheckInterval : Integer;
FConnected : Boolean;
FIP : String;
{ Pointer to application's OnConnect handler, if any }
FOnConnect : TNotifyEvent;
{ Pointer to application's OnDisconnect handler, if any }
FOnDisconnect : TNotifyEvent;
Timer : TTimer; { Private methods of TKZInternetDetect }
{ Method to set variable and property values and create objects }
procedure AutoInitialize;
{ Method to free any objects created by AutoInitialize }
procedure AutoDestroy; procedure SetConnected(Value : Boolean);
procedure SetIP(Value : String);
procedure Check(Sender:TObject); protected
{ Protected fields of TKZInternetDetect } { Protected methods of TKZInternetDetect }
{ Method to generate OnConnect event }
procedure Connect(Sender : TObject); virtual;
{ Method to generate OnDisconnect event }
procedure Disconnect(Sender : TObject); virtual;
procedure Loaded; override; public
{ Public fields and properties of TKZInternetDetect } { Public methods of TKZInternetDetect } constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function Execute : Boolean; published
{ Published properties of TKZInternetDetect }
property OnConnect : TNotifyEvent read FOnConnect write FOnConnect;
property OnDisconnect : TNotifyEvent read FOnDisconnect write FOnDisconnect;
property CheckInterval : Integer
read FCheckInterval write FCheckInterval
default 1000;
property Connected : Boolean
read FConnected write SetConnected
default False;
property IP : String read FIP write SetIP; end; procedure Register; implementation procedure Register;
begin
{ Register TKZInternetDetect with KireZ as its
default page on the Delphi component palette }
RegisterComponents('KireZ', [TKZInternetDetect]);
end; { Method to set variable and property values and create objects }
procedure TKZInternetDetect.AutoInitialize;
begin
Timer := TTimer.Create(Self);
FCheckInterval := 1000;
FConnected := False;
FIP := '127.0.0.1';
end; { of AutoInitialize } { Method to free any objects created by AutoInitialize }
procedure TKZInternetDetect.AutoDestroy;
begin
Timer.Free;
end; { of AutoDestroy } procedure TKZInternetDetect.SetConnected(Value : Boolean); begin
FConnected := Value;
end; procedure TKZInternetDetect.SetIP(Value : String);
begin
FIP := Value;
end; { Method to generate OnConnect event }
procedure TKZInternetDetect.Connect(Sender : TObject);
begin
{ Has the application assigned a method to the event, whether
via the Object Inspector or a run-time assignment? If so,
execute that method }
if Assigned(FOnConnect) then
FOnConnect(Sender);
end; { Method to generate OnDisconnect event }
procedure TKZInternetDetect.Disconnect(Sender : TObject);
begin
{ Has the application assigned a method to the event, whether
via the Object Inspector or a run-time assignment? If so,
execute that method }
if Assigned(FOnDisconnect) then
FOnDisconnect(Sender);
end; procedure TKZInternetDetect.Check(Sender:TObject); var
RASConns:TRasConn;
dwSize:dword;
dwCount:dword;
RASpppIP:TRASpppIP;
T:Boolean;
r:string;
begin
r:='';
RASConns.dwSize:=SizeOf(TRASConn);
RASpppIP.dwSize:=SizeOf(RASpppIP);
dwSize:=SizeOf(RASConns);
If RASEnumConnections(@RASConns, dwSize, dwCount)=0 Then If dwCount > 0 Then begin
dwSize := SizeOf(RASpppIP);
If RASGetProjectionInfo(RASConns.hRasConn, RASP_PPPIP, @RasPPPIP, dwSize)=0 Then
r:=strPas(RASpppIP.szIPAddress);
End;
t:=Connected;
Connected:=(r<>'127.0.0.1') and (r<>'') and (r<>' ');
FIP:=r;
if ((not t) and Connected) then Connect(Sender);
if (t and (not Connected)) then Disconnect(Sender);
end; constructor TKZInternetDetect.Create(AOwner: TComponent); begin
inherited Create(AOwner);
AutoInitialize; { Code to perform other tasks when the component is created }
Timer.OnTimer:=Check;
CheckInterval:=1000;
end; destructor TKZInternetDetect.Destroy;
begin
AutoDestroy;
inherited Destroy;
end; function TKZInternetDetect.Execute : Boolean;
begin
{ Perform the component operation } { Return True if the operation was successful, False otherwise }
Result := True
end; procedure TKZInternetDetect.Loaded;
begin
inherited Loaded; { Perform any component setup that depends on the property values having been set } end;
end.
来自：DNChen 时间：99-8-31 07:30:18 ID:130040
>2. windows登陆internet后,使用什麽消息变量传递的.我可否使用
没有消息可以响应，只有你自己的程序拨号时，才可以提供一个回调函数给ras api，
这个时候才可以获得拨号成功/失败信息。 来自：cytown 时间：99-8-31 17:53:46 ID:130196
可以通过ping www.netscape.com是否通来判断, 不过, 如果你的局域网
有一个机器或服务器是WWW.NETSCAPE.COM, 那么......
话说回来了, 谁会设这么一台机器呢? 可以用ics构件里的tping构件. 来自：Kim Wong 时间：99-8-31 22:50:32 ID:130290
使用 idle 是否会比用 timer 节约资源呢？
不过我以前就是用 timer 来实现的一个记费器，并没感觉事件响应有迟缓。
其实 timer 也不是太占资源啦！
begin
if not inetisoffline then
showmessage('already connect to Internet');
end;