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Hanging up Dial-up networking

Outlook Express has that checkbox "Hang up when finished" that disconnects dial-up networking. How to do that in a delphi 4 application?

I need a delphi-native source code to do that. I can't add 3rd party components or dlls to my application.
1 Solution
If you want to dial through your application, it's simple enough.
You can use the RAS component to dial/hang-up/select ras entry/...  It's pure native delphi code, utilizing windows RAS

You can download it from many sites, or give me your e-mail and I mail it to you, a very small component with good function.

But if you want to hang up an existing dial-up networking
connection that brought up by other applications, I'm sorry I
don't know yet.
When ever any connection is through windows provide a tray icon
with a disconnect button.This can be used for all applications.
You dont have to write an application for this.
But if you have to connect and disconnect through a delphi application(like I do) give me your e mail address and i will send you two free components which will do the trick.The components are not written by me but are availble in the various delphi sites
I have answered similar questions and you can get the question from list of questions answered in the delphi experts exchange forum itself.
do not grant me any points because i have already been awarded points previously.
acerolaAuthor Commented:
I want to hang up a dial-up connection that was estabilished by using the dial-up networking. And I must not use any other components. I guess that there is a hang-up proc/func in rnaapp.dll. Couldn't I just call it? If so, how?

Once again, I want some source code, NOT some new components. I thougt that doing this took only a couple lines of code...
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This may be a good starting point to you:
First retrieve the open connection(s), and then hang up
with the handle you got.
I had to write this because sometime (under Win95 NOT 98)
the Explorer crashed/restarted emptying the tray leaving
me without a possibilty to close my dial-up connection.

function RasHangUp(RASCONN: HRASCONN): DWORD; stdcall;

function HangUpRAS: Integer;
  MaxConnections = 16;
  RAS: array[1..MaxConnections] of TRASCONN;
  BuffSize: DWORD;
  CONNSWritten: DWORD;
  i: Integer;
  Ret: DWORD;
  Result := 0;
    { retrieve the number of Connections }
  RAS[1].dwSize := SizeOf(RAS[1]);
  BUFFSize := SizeOf(RAS);
  CONNSWritten := 0;
  Ret := RasEnumConnections(@RAS, BUFFSize, CONNSWritten);

  if (Ret = 0) or (Ret = ERROR_BUFFER_TOO_SMALL) then
    for i := 1 to CONNSWritten do
      if RashangUp(RAS[i].hrasconn) = 0 then Inc(Result);

acerolaAuthor Commented:
Please post the definitions of the structures (TRASCONN, HRASCONN, etc). Or tell me where to find them. Also, will I need any other file besides rasapi32.dll?

Shouldn't result:=0 be ret:=0?
You can find all the structures along with the procedure declarations in the D_RAS library. Even though you don't want it, this packagde also include a very comprehensive demo program to show (almost) all the RAS functions.
Check http://www.torry.ru/vcl/comms/d_ras.zip
acerolaAuthor Commented:
Thank you all.
The points will go to EmmDieh, so please post something as answer.
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