ly = ^TIcmpEchoReply;
TIcmpEchoReply = packed record
Address: DWord; // replying address
Status: DWord; // IP status value (see below)
RTT: DWord; // Round Trip Time in milliseconds
DataSize: Word; // reply data size
Reserved: Word;
Data: Pointer; // pointer to reply data buffer
Options: TIPOptionInformation; // reply options
end;
TIcmpCreateFile = function: THandle; stdcall;
TIcmpCloseHandle = function(IcmpHandle: THandle): Boolean; stdcall;
TIcmpSendEcho = function(
IcmpHandle: THandle;
DestinationAddress: DWord;
RequestData: Pointer;
RequestSize: Word;
RequestOptions: PIPOptionInformation;
ReplyBuffer: Pointer;
ReplySize: DWord;
Timeout: DWord
): DWord; stdcall;
const
Size = 32;
TimeOut = 1000;
var
wsadata: TWSAData;
Address: DWord; // Address of host to contact
HostName, HostIP: String; // Name and dotted IP of host to contact
Phe: PHostEnt; // HostEntry buffer for name lookup
BufferSize, nPkts: Integer;
pReqData, pData: Pointer;
pIPE: PIcmpEchoReply; // ICMP Echo reply buffer
IPOpt: TIPOptionInformation; // IP Options for packet to send
const
IcmpDLL = ''''icmp.dll'''';
var
hICMPlib: HModule;
IcmpCreateFile : TIcmpCreateFile;
IcmpCloseHandle: TIcmpCloseHandle;
IcmpSendEcho: TIcmpSendEcho;
hICMP: THandle; // Handle for the ICMP Calls
begin
// initialise winsock
Result:=True;
if WSAStartup(2,wsadata) <> 0 then begin
Result:=False;
halt;
end;
// register the icmp.dll stuff
hICMPlib := loadlibrary(icmpDLL);
if hICMPlib <> null then begin
@ICMPCreateFile := GetProcAddress(hICMPlib, ''''IcmpCreateFile'''');
@IcmpCloseHandle:= GetProcAddress(hICMPlib, ''''IcmpCloseHandle'''');
@IcmpSendEcho:= GetProcAddress(hICMPlib, ''''IcmpSendEcho'''');
if (@ICMPCreateFile = Nil) or (@IcmpCloseHandle = Nil) or (@IcmpSendEcho = Nil) then begin
Result:=False;
halt;
end;
hICMP := IcmpCreateFile;
if hICMP = INVALID_HANDLE_VALUE then begin
Result:=False;
halt;
end;
end else begin
Result:=False;
halt;
end;
// ------------------------------------------------------------
Address := inet_addr(PChar(IpAddr));
if (Address = INADDR_NONE) then begin
Phe := GetHostByName(PChar(IpAddr));
if Phe = Nil then Result:=False
else begin
Address := longint(plongint(Phe^.h_addr_list^)^);
HostName := Phe^.h_name;
HostIP := StrPas(inet_ntoa(TInAddr(Address)));
end;
end
else begin
Phe := GetHostByAddr(@Address, 4, PF_INET);
if Phe = Nil then Result:=False;
end;
if Address = INADDR_NONE then
begin
Result:=False;
end;
// Get some data buffer space and put something in the packet to send
BufferSize := SizeOf(TICMPEchoReply) + Size;
GetMem(pReqData, Size);
GetMem(pData, Size);
GetMem(pIPE, BufferSize);
FillChar(pReqData^, Size, $AA);
pIPE^.Data := pData;
// Finally Send the packet
FillChar(IPOpt, SizeOf(IPOpt), 0);
IPOpt.TTL := 64;
NPkts := IcmpSendEcho(hICMP, Address, pReqData, Size,
@IPOpt, pIPE, BufferSize, TimeOut);
if NPkts = 0 then Result:=False;
// Free those buffers
FreeMem(pIPE); FreeMem(pData); FreeMem(pReqData);
// --------------------------------------------------------------
IcmpCloseHandle(hICMP);
FreeLibrary(hICMPlib);
// free winsock
if WSACleanup <> 0 then Result:=False;
end;
{=================================================================
功 能: 检测计算机是否上网
参 数: 无
返回值: 成功: True 失败: False;
备 注: uses Wininet
版 本:
1.0 2002/10/07 13:33:00
=================================================================}
function InternetConnected: Boolean;
const
// local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_MODEM = 1;
// local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_LAN = 2;
// local system uses a proxy server to connect to the Internet.
INTERNET_CONNECTION_PROXY = 4;
// local system''''s modem is busy with a non-Internet connection.
INTERNET_CONNECTION_MODEM_BUSY = 8;
var
dwConnectionTypes : DWORD;
begin
dwConnectionTypes := INTERNET_CONNECTION_MODEM+ INTERNET_CONNECTION_LAN
+ INTERNET_CONNECTION_PROXY;
Result := InternetGetConnectedState(@dwConnectionTypes, 0);
end;
end.
/////////////////////////////*******************************************//错误信息常量
unit Head;
interface
const
C_Err_GetLocalIp = ''''获取本地ip失败'''';
C_Err_GetNameByIpAddr = ''''获取主机名失败'''';
C_Err_GetSQLServerList = ''''获取SQLServer服务器失败'''';
C_Err_GetUserResource = ''''获取共享资失败'''';
C_Err_GetGroupList = ''''获取所有工作组失败'''';
C_Err_GetGroupUsers = ''''获取工作组中所有计算机失败'''';
C_Err_GetNetList = ''''获取所有网络类型失败'''';
C_Err_CheckNet = ''''网络不通'''';
C_Err_CheckAttachNet = ''''未登入网络'''';
C_Err_InternetConnected =''''没有上网'''';
C_Txt_CheckNetSuccess = ''''网络畅通'''';
C_Txt_CheckAttachNetSuccess = ''''已登入网络'''';
C_Txt_InternetConnected =''''上网了'''';
implementation
end.
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