Title: Checking and Disconnecting DUN
Question: How to check and disconnect from DUN connection?
Answer:
This answer is a direct translation from a snipplet using VB I found from the Internet. The constant RAS_RASCONNSIZE is still a mistery for me, I can't use sizeof(TRasConn) for setting dwSize of TRasConn record.
const
RAS_MAXENTRYNAME = 256;
RAS_MAXDEVICETYPE = 16;
RAS_MAXDEVICENAME = 128;
RAS_RASCONNSIZE = 412;
type
TRasEntryName= record
dwSize: longint;
szEntryName: array[1..RAS_MAXENTRYNAME] of char;
end;
TRasConn= record
dwSize: longint;
hRasConn: longint;
szEntryName: array [1..RAS_MAXENTRYNAME] of char;
szDeviceType,szDeviceName: array [1..RAS_MAXDEVICETYPE] of char;
end;
TRasEntryNamePtr=^TRasEntryName;
TRasConnPtr=^TRasConn;
longintPtr=^longint;
function RasEnumConnectionsA(lpRasConn:TRasConnPtr;lpcb:longintPtr;
lpcConnections:longintPtr):longint;stdcall;external 'RASAPI32.DLL';
function RasHangUpA(hRasConn:longint):longint;stdcall;external 'RASAPI32.DLL';
function ConnectedService: string;
var
aReg : TRegistry;
begin
aReg := TRegistry.Create;
aReg.RootKey := HKEY_CURRENT_USER;
result:='';
if aReg.OpenKey('RemoteAccess', False) then
result:= aReg.ReadString('Default');
aReg.Free;
end;
procedure RasHangup;
var
i,lpcb,lpcConnections,hRasConn,returnCode:longint;
lpRasConn: array [0..255] of TRasConn;
serviceName: string;
begin
lpRasConn[0].dwSize:= RAS_RASCONNSIZE;
lpcb:=RAS_MAXENTRYNAME * lpRasConn[0].dwSize;
lpcConnections:= 0;
serviceName:=connectedService;
returnCode:= RasEnumConnectionsA(@lpRasConn[0],@lpcb,@lpcConnections);
if returnCode = ERROR_SUCCESS then
begin
for i:= 0 to lpcConnections - 1 do
begin
if serviceName=PChar(@lpRasConn[i].szEntryName) then
begin
hRasConn:=lpRasConn[i].hRasConn;
RasHangUpA(hRasConn);
end;
end;
end;
end;
function IsConnected: boolean;
var
aReg : TRegistry;
aLong: longint;
begin
aLong:=0;
aReg := TRegistry.Create;
aReg.RootKey := HKEY_LOCAL_MACHINE;
if aReg.OpenKey('System\CurrentControlSet\Services\RemoteAccess', False) then
aReg.ReadBinaryData('Remote Connection',aLong,sizeof(aLong));
result:=aLong0;
aReg.Free;
end;