Find all Local Computers on a LAN
How to use WinAPI to find the
computers on the LAN? Call
FindComputers, which returns the
WinAPI error code (if any).
The function will fill the
stringlist Computers with the
computer names. It is developed with Delphi 5, but
should be backward-compatible.
unit FindComp;
interface
uses
Windows, Classes;
function FindComputers: DWORD;
var
Computers: TStringList;
implementation
uses
SysUtils;
const
MaxEntries = 250;
function FindComputers: DWORD;
var
EnumWorkGroupHandle,
EnumComputerHandle : THandle;
EnumError : DWORD;
Network : TNetResource;
WorkGroupEntries,
ComputerEntries : DWORD;
EnumWorkGroupBuffer,
EnumComputerBuffer : array[1..MaxEntries] of
TNetResource;
EnumBufferLength : DWORD;
I, J : DWORD;
begin
Computers.Clear;
FillChar(Network, SizeOf(Network), 0);
with Network do
begin
dwScope := RESOURCE_GLOBALNET;
dwType := RESOURCETYPE_ANY;
dwUsage := RESOURCEUSAGE_CONTAINER;
end;
EnumError := WNetOpenEnum(RESOURCE_GLOBALNET,
RESOURCETYPE_ANY, 0,
@Network,
EnumWorkGroupHandle);
if EnumError = NO_ERROR then
begin
WorkGroupEntries := MaxEntries;
EnumBufferLength := SizeOf(EnumWorkGroupBuffer);
EnumError := WNetEnumResource(EnumWorkGroupHandle,
WorkGroupEntries,
@EnumWorkGroupBuffer,
EnumBufferLength);
if EnumError = NO_ERROR then
begin
for I := 1 to WorkGroupEntries do
begin
EnumError := WNetOpenEnum(RESOURCE_GLOBALNET,
RESOURCETYPE_ANY, 0,
@EnumWorkGroupBuffer[I],
EnumComputerHandle);
if EnumError = NO_ERROR then
begin
ComputerEntries := MaxEntries;
EnumBufferLength:= SizeOf(EnumComputerBuffer);
EnumError:=WNetEnumResource(EnumComputerHandle,
ComputerEntries,
@EnumComputerBuffer,
EnumBufferLength);
if EnumError = NO_ERROR then
for J := 1 to ComputerEntries do
Computers.Add(Copy(EnumComputerBuffer[J].
lpRemoteName, 3,
Length(EnumComputerBuffer[J].
lpRemoteName) - 2));
WNetCloseEnum(EnumComputerHandle);
end;
end;
end;
WNetCloseEnum(EnumWorkGroupHandle);
end;
if EnumError = ERROR_NO_MORE_ITEMS then
EnumError := NO_ERROR;
Result := EnumError;
end;
initialization
Computers := TStringList.Create;
finalization
Computers.Free;
end.
