分享程序员开发的那些事...
更新时间：2022-05-24 09:07:45
我参与了一个项目，每当用户通过 VPN 连接我们的网络时，都会运行用户的登录脚本.为此，我编写了一个辅助单元来检索适配器信息并将其存储到一个简单的记录中.
I worked on a project to run a user's logon script whenever they connected our network over VPN. To do this, I wrote a helper unit that retrieves adapter info and stores it into a simple record.
然后我设置了一个注册表通知，请参阅此处了解如何操作在德尔福
I then setup up a registry notification, see here for how to do that in Delphi
注册表通知位于 HKLMSYSTEMCurrentControlSetServicesTcpipParametersInterfaces.每次 Windows 获取新 IP 地址或对适配器连接信息进行任何类型的更改时，都会触发此通知事件.当此事件触发时，我调用了该函数(在下面的代码中)以检索有关适配器的更新信息.我将这些新信息与我之前记录的信息进行了比较……这意味着我必须保存之前的适配器信息查询才能知道是否发生了某些变化.
The registry notification was on HKLMSYSTEMCurrentControlSetServicesTcpipParametersInterfaces. This notification event fires every time Windows obtains a new IP address, or makes any type of change to an adapters connection information. When this event fired, I called the function (in the code below) to retrieve updated information about the adapter. I compared this new information to my previously recorded information...meaning I had to save the previous adapter info query in order to know if something had changed.
无论如何，这是我的辅助单元:
Anyhow, here is my helper unit:
unit uAdapterInfo;
interface
uses
Classes,
SysUtils;
const
MAX_INTERFACE_NAME_LEN = $100;
ERROR_SUCCESS = 0;
MAXLEN_IFDESCR = $100;
MAXLEN_PHYSADDR = 8;
MIB_IF_OPER_STATUS_NON_OPERATIONAL = 0;
MIB_IF_OPER_STATUS_UNREACHABLE = 1;
MIB_IF_OPER_STATUS_DISCONNECTED = 2;
MIB_IF_OPER_STATUS_CONNECTING = 3;
MIB_IF_OPER_STATUS_CONNECTED = 4;
MIB_IF_OPER_STATUS_OPERATIONAL = 5;
MIB_IF_TYPE_OTHER = 1;
MIB_IF_TYPE_ETHERNET = 6;
MIB_IF_TYPE_TOKENRING = 9;
MIB_IF_TYPE_FDDI = 15;
MIB_IF_TYPE_PPP = 23;
MIB_IF_TYPE_LOOPBACK = 24;
MIB_IF_TYPE_SLIP = 28;
MIB_IF_ADMIN_STATUS_UP = 1;
MIB_IF_ADMIN_STATUS_DOWN = 2;
MIB_IF_ADMIN_STATUS_TESTING = 3;
_MAX_ROWS_ = 20;
ANY_SIZE = 1;
type
MIB_IFROW = record
wszName: array[0 .. (MAX_INTERFACE_NAME_LEN * 2 - 1)] of ansichar;
dwIndex: longint;
dwType: longint;
dwMtu: longint;
dwSpeed: longint;
dwPhysAddrLen: longint;
bPhysAddr: array[0 .. (MAXLEN_PHYSADDR - 1)] of byte;
dwAdminStatus: longint;
dwOperStatus: longint;
dwLastChange: longint;
dwInOctets: longint;
dwInUcastPkts: longint;
dwInNUcastPkts: longint;
dwInDiscards: longint;
dwInErrors: longint;
dwInUnknownProtos: longint;
dwOutOctets: longint;
dwOutUcastPkts: longint;
dwOutNUcastPkts: longint;
dwOutDiscards: longint;
dwOutErrors: longint;
dwOutQLen: longint;
dwDescrLen: longint;
bDescr: array[0 .. (MAXLEN_IFDESCR - 1)] of ansichar;
end;
type
MIB_IPADDRROW = record
dwAddr: longint;
dwIndex: longint;
dwMask: longint;
dwBCastAddr: longint;
dwReasmSize: longint;
unused1: word;
unused2: word;
end;
type
_IfTable = record
nRows: longint;
ifRow: array[1.._MAX_ROWS_] of MIB_IFROW;
end;
type
_IpAddrTable = record
dwNumEntries: longint;
table: array[1..ANY_SIZE] of MIB_IPADDRROW;
end;
function GetIfTable(pIfTable: Pointer; var pdwSize: longint; bOrder: longint): longint;
stdcall;
function GetIpAddrTable(pIpAddrTable: Pointer; var pdwSize: longint;
bOrder: longint): longint; stdcall;
function Get_if_type(iType: integer): string;
function Get_if_admin_status(iStatus: integer): string;
function Get_if_oper_status(iStatus: integer): string;
implementation
function GetIfTable; stdcall; external 'IPHLPAPI.DLL';
function GetIpAddrTable; stdcall; external 'IPHLPAPI.DLL';
function Get_if_type(iType: integer): string;
var
sResult: string;
begin
sResult := 'UNKNOWN';
case iType of
1: sResult := 'Other';
6: sResult := 'Ethernet';
9: sResult := 'Tokenring';
15: sResult := 'FDDI';
23: sResult := 'PPP';
24: sResult := 'Local loopback';
28: sResult := 'SLIP';
37: sResult := 'ATM';
71: sResult := 'IEEE 802.11';
131: sResult := 'Tunnel';
144: sResult := 'IEEE 1394 (Firewire)';
end;
Result := sResult;
end;
function Get_if_admin_status(iStatus: integer): string;
var
sResult: string;
begin
sResult := 'UNKNOWN';
case iStatus of
1: sResult := 'UP';
2: sResult := 'DOWN';
3: sResult := 'TESTING';
end;
Result := sResult;
end;
function Get_if_oper_status(iStatus: integer): string;
var
sResult: string;
begin
sResult := 'UNKNOWN';
case iStatus of
0: sResult := 'NON_OPERATIONAL';
1: sResult := 'UNREACHABLE';
2: sResult := 'DISCONNECTED';
3: sResult := 'CONNECTING';
4: sResult := 'CONNECTED';
5: sResult := 'OPERATIONAL';
end;
Result := sResult;
end;
end.
为了从另一个单元使用这个单元，我创建了以下函数，它填充了一个名为 TAdapterInfo(在我的主单元中声明)的自定义类型:
To use this unit from another unit, I created the following function, which populated a custom type called TAdapterInfo (declared in my main unit):
type
TAdapterInfo = array of record
dwIndex: longint;
dwType: longint;
dwMtu: longint;
dwSpeed: extended;
dwPhysAddrLen: longint;
bPhysAddr: string;
dwAdminStatus: longint;
dwOperStatus: longint;
dwLastChange: longint;
dwInOctets: longint;
dwInUcastPkts: longint;
dwInNUcastPkts: longint;
dwInDiscards: longint;
dwInErrors: longint;
dwInUnknownProtos: longint;
dwOutOctets: longint;
dwOutUcastPkts: longint;
dwOutNUcastPkts: longint;
dwOutDiscards: longint;
dwOutErrors: longint;
dwOutQLen: longint;
dwDescrLen: longint;
bDescr: string;
sIpAddress: string;
sIpMask: string;
end;
//////////
function Get_EthernetAdapterDetail(var AdapterDataFound: TAdapterInfo): boolean;
var
pIfTable: ^_IfTable;
pIpTable: ^_IpAddrTable;
ifTableSize, ipTableSize: longint;
tmp: string;
i, j, k, m: integer;
ErrCode: longint;
sAddr, sMask: in_addr;
IPAddresses, IPMasks: TStringList;
sIPAddressLine, sIPMaskLine: string;
bResult: boolean;
begin
bResult := True; //default return value
pIfTable := nil;
pIpTable := nil;
IPAddresses := TStringList.Create;
IPMasks := TStringList.Create;
try
// First: just get the buffer size.
// TableSize returns the size needed.
ifTableSize := 0; // Set to zero so the GetIfTabel function
// won't try to fill the buffer yet,
// but only return the actual size it needs.
GetIfTable(pIfTable, ifTableSize, 1);
if (ifTableSize < SizeOf(MIB_IFROW) + Sizeof(longint)) then
begin
bResult := False;
Result := bResult;
Exit; // less than 1 table entry?!
end;
ipTableSize := 0;
GetIpAddrTable(pIpTable, ipTableSize, 1);
if (ipTableSize < SizeOf(MIB_IPADDRROW) + Sizeof(longint)) then
begin
bResult := False;
Result := bResult;
Exit; // less than 1 table entry?!
end;
// Second:
// allocate memory for the buffer and retrieve the
// entire table.
GetMem(pIfTable, ifTableSize);
ErrCode := GetIfTable(pIfTable, ifTableSize, 1);
if ErrCode <> ERROR_SUCCESS then
begin
bResult := False;
Result := bResult;
Exit; // OK, that did not work.
// Not enough memory i guess.
end;
GetMem(pIpTable, ipTableSize);
ErrCode := GetIpAddrTable(pIpTable, ipTableSize, 1);
if ErrCode <> ERROR_SUCCESS then
begin
bResult := False;
Result := bResult;
Exit;
end;
for k := 1 to pIpTable^.dwNumEntries do
begin
sAddr.S_addr := pIpTable^.table[k].dwAddr;
sMask.S_addr := pIpTable^.table[k].dwMask;
sIPAddressLine := Format('0x%8.8x', [(pIpTable^.table[k].dwIndex)]) +
'=' + Format('%s', [inet_ntoa(sAddr)]);
sIPMaskLine := Format('0x%8.8x', [(pIpTable^.table[k].dwIndex)]) +
'=' + Format('%s', [inet_ntoa(sMask)]);
IPAddresses.Add(sIPAddressLine);
IPMasks.Add(sIPMaskLine);
end;
SetLength(AdapterDataFound, pIfTable^.nRows); //initialize the array or records
for i := 1 to pIfTable^.nRows do
try
//if pIfTable^.ifRow[i].dwType=MIB_IF_TYPE_ETHERNET then
//begin
m := i - 1;
AdapterDataFound[m].dwIndex := 4;//(pIfTable^.ifRow[i].dwIndex);
AdapterDataFound[m].dwType := (pIfTable^.ifRow[i].dwType);
AdapterDataFound[m].dwIndex := (pIfTable^.ifRow[i].dwIndex);
AdapterDataFound[m].sIpAddress :=
IPAddresses.Values[Format('0x%8.8x', [(pIfTable^.ifRow[i].dwIndex)])];
AdapterDataFound[m].sIpMask :=
IPMasks.Values[Format('0x%8.8x', [(pIfTable^.ifRow[i].dwIndex)])];
AdapterDataFound[m].dwMtu := (pIfTable^.ifRow[i].dwMtu);
AdapterDataFound[m].dwSpeed := (pIfTable^.ifRow[i].dwSpeed);
AdapterDataFound[m].dwAdminStatus := (pIfTable^.ifRow[i].dwAdminStatus);
AdapterDataFound[m].dwOperStatus := (pIfTable^.ifRow[i].dwOperStatus);
AdapterDataFound[m].dwInUcastPkts := (pIfTable^.ifRow[i].dwInUcastPkts);
AdapterDataFound[m].dwInNUcastPkts := (pIfTable^.ifRow[i].dwInNUcastPkts);
AdapterDataFound[m].dwInDiscards := (pIfTable^.ifRow[i].dwInDiscards);
AdapterDataFound[m].dwInErrors := (pIfTable^.ifRow[i].dwInErrors);
AdapterDataFound[m].dwInUnknownProtos := (pIfTable^.ifRow[i].dwInUnknownProtos);
AdapterDataFound[m].dwOutNUcastPkts := (pIfTable^.ifRow[i].dwOutNUcastPkts);
AdapterDataFound[m].dwOutUcastPkts := (pIfTable^.ifRow[i].dwOutUcastPkts);
AdapterDataFound[m].dwOutDiscards := (pIfTable^.ifRow[i].dwOutDiscards);
AdapterDataFound[m].dwOutErrors := (pIfTable^.ifRow[i].dwOutErrors);
AdapterDataFound[m].dwOutQLen := (pIfTable^.ifRow[i].dwOutQLen);
AdapterDataFound[m].bDescr := (pIfTable^.ifRow[i].bDescr);
tmp := '';
for j := 0 to pIfTable^.ifRow[i].dwPhysAddrLen - 1 do
begin
if Length(tmp) > 0 then
tmp := tmp + '-' + format('%.2x', [pIfTable^.ifRow[i].bPhysAddr[j]])
else
tmp := tmp + format('%.2x', [pIfTable^.ifRow[i].bPhysAddr[j]]);
end;
if Length(tmp) > 0 then
begin
AdapterDataFound[m].bPhysAddr := tmp;
end;
except
bResult := False;
Result := bResult;
Exit;
end;
finally
if Assigned(pIfTable) then
begin
FreeMem(pIfTable, ifTableSize);
end;
FreeAndNil(IPMasks);
FreeAndNil(IPAddresses);
end;
Result := bResult;
end;
顺便提一下，我还使用了这个单元和几乎完全相同的代码来创建 ifconfig -a 的副本，其中 可以在 github 上找到.我主要是作为一个练习来教自己如何完成这项任务.
On a completely side note, I also used this unit and almost exact same code to create a duplicate of ifconfig -a, which can be found on github. I mainly did it as an exercise in teaching myself how to accomplish this task.