unit NetworkFunctions;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, WinInet, WinSock;
type
PNetResourceArray = ^TNetResourceArray;
TNetResourceArray =
array[0..100]
of TNetResource;
type
IPAddr = DWORD;
PICMP_ECHO_REPLY = ^ICMP_ECHO_REPLY;
ICMP_ECHO_REPLY =
packed record
Address : ULONG;
Status : ULONG;
RoundTripTime : ULONG;
DataSize : WORD;
Reserved : WORD;
Data : Pointer;
end;
PIP_OPTION_INFORMATION = ^IP_OPTION_INFORMATION;
IP_OPTION_INFORMATION =
packed record
Ttl : byte;
Tos : byte;
Flags : byte;
OptionsSize : byte;
OptionsData : Pointer;
end;
procedure GetComputerList(List: TStrings);
function InternetAvailable:Boolean;
// Only DFÜ / RAS
function Ping(
IP:
string; TimeOut:Cardinal) : Boolean;
// TimeOut ~1000
function GetNetworkName(IPAddr:
string):
string;
function GetIp(
const HostName:
string):
string;
implementation
function IcmpCreateFile : DWORD;
stdcall;
external '
icmp.dll';
function IcmpCloseHandle(
const IcmpHandle : DWORD) : longbool;
stdcall;
external '
icmp.dll';
function IcmpSendEcho(
const IcmpHandle : DWORD;
const DestinationAddress : IPAddr;
const RequestData : Pointer;
const RequestSize : WORD;
const RequestOptions : PIP_OPTION_INFORMATION;
const ReplyBuffer : Pointer;
const ReplySize : DWORD;
const TimeOut : DWORD) : DWORD;
stdcall;
external '
icmp.dll'
function GetNetworkName(IPAddr:
string):
string;
var SockAddrIn: TSockAddrIn;
HostEnt: PHostEnt;
WSAData: TWSAData;
begin
WSAStartup($101, WSAData);
SockAddrIn.sin_addr.s_addr := inet_addr(PChar(IPAddr));
HostEnt:= GetHostByAddr(@SockAddrIn.sin_addr.S_addr, 4, AF_INET);
if HostEnt <>
nil then
Result := StrPas(Hostent^.h_name)
else
Result := '
';
end;
function GetIp(
const HostName:
string):
string;
type
TaPInAddr =
array[0..10]
of PInAddr;
PaPInAddr = ^TaPInAddr;
var
phe: PHostEnt;
pptr: PaPInAddr;
i: Integer;
GInitData: TWSAData;
begin
WSAStartup($101, GInitData);
Result := '
';
phe := GetHostByName(PChar(HostName));
if phe =
nil then Exit;
pPtr := PaPInAddr(phe^.h_addr_list);
i := 0;
while pPtr^[i] <>
nil do begin
Result := inet_ntoa(pptr^[i]^);
Inc(i);
end;
WSACleanup;
end;
function Ping(
IP:
string; TimeOut:Cardinal):Boolean;
var hICMP : DWORD;
pierWork : PICMP_ECHO_REPLY;
dwSize : DWORD;
Class1,Class2,Class3,Class4 :
String;
i,j : Byte;
begin
Result:=False;
j:=1;
for i:=1
to Length(
IP)
do begin
if IP[i]<>'
.'
then begin
case j
of
1: Class1:=Class1+
IP[i];
2: Class2:=Class2+
IP[i];
3: Class3:=Class3+
IP[i];
4: Class4:=Class4+
IP[i];
end;
end else
Inc(j);
end;
hICMP := IcmpCreateFile;
if hICMP = INVALID_HANDLE_VALUE
then exit;
try
dwSize := SizeOf(ICMP_ECHO_REPLY)+8;
pierWork := AllocMem(dwSize);
try
if IcmpSendEcho(hICMP,MAKELONG(MAKEWORD(StrToInt(Class1), StrToInt(Class2)),MAKEWORD(StrToInt(Class3), StrToInt(Class4))),
nil,0,
nil,pierWork,dwSize,TimeOut) = 0
then
Result:=False
else
Result:=True;
finally
FreeMem(pierWork,dwSize);
end;
finally
IcmpCloseHandle(hIcmp);
end;
end;
// Nur für DFÜ / RAS
function InternetAvailable:Boolean;
begin
Result := InternetCheckConnection(
nil, 0, 0);
end;
function CreateNetResourceList(ResourceType: DWord;
NetResource: PNetResource;
out Entries: DWord;
out List: PNetResourceArray): Boolean;
var
EnumHandle: THandle;
BufSize: DWord;
Res: DWord;
begin
Result := False;
List :=
Nil;
Entries := 0;
if WNetOpenEnum(RESOURCE_GLOBALNET,ResourceType,0,NetResource,EnumHandle) = NO_ERROR
then begin
try
BufSize := $4000;
// 16 kByte
GetMem(List, BufSize);
try
repeat
Entries := DWord(-1);
FillChar(List^, BufSize, 0);
Res := WNetEnumResource(EnumHandle, Entries, List, BufSize);
if Res = ERROR_MORE_DATA
then begin
ReAllocMem(List, BufSize);
end;
until Res <> ERROR_MORE_DATA;
Result := Res = NO_ERROR;
if not Result
then begin
FreeMem(List);
List :=
Nil;
Entries := 0;
end;
except
FreeMem(List);
raise;
end;
finally
WNetCloseEnum(EnumHandle);
end;
end;
end;
procedure GetComputerList(List: TStrings);
procedure ScanLevel(ResourceType, DisplayType: DWord; NetResource: PNetResource);
var
Entries: DWord;
NetResourceList: PNetResourceArray;
i: Integer;
begin
if CreateNetResourceList(ResourceType, NetResource, Entries, NetResourceList)
then try
for i := 0
to Integer(Entries) - 1
do begin
if (DisplayType = RESOURCEDISPLAYTYPE_GENERIC)
or
(NetResourceList[i].dwDisplayType = DisplayType)
then begin
List.AddObject(NetResourceList[i].lpRemoteName,
Pointer(NetResourceList[i].dwDisplayType));
end;
if (NetResourceList[i].dwUsage
and RESOURCEUSAGE_CONTAINER) <> 0
then
ScanLevel(RESOURCETYPE_DISK, RESOURCEDISPLAYTYPE_SERVER,@NetResourceList[i]);
end;
finally
FreeMem(NetResourceList);
end;
end;
begin
ScanLevel(RESOURCETYPE_DISK, RESOURCEDISPLAYTYPE_SERVER,
Nil);
end;
end.