ender1986
12th March 2004 16:06 UTC

check internet connection
Hello.
I have a question regarding checking internet connection.
I am trying to detect if there is an internet connection with the folowing code:
------------------------------------
Function ConnectInternet

Push $R0

ClearErrors
Dialer::AttemptConnect
IfErrors noie3

Pop $R0
StrCmp $R0 "online" connected
MessageBox MB_OK|MB_ICONSTOP "Cannot connect to the internet."
Quit

noie3:

; IE3 not installed
MessageBox MB_OK|MB_ICONINFORMATION "Please connect to the internet now."

connected:
MessageBox MB_OK " connection to internet was verified."
Pop $R0

FunctionEnd
-----------------------
The problem is : I want to detect if
the function works corectly and I unplug the network
cable. Then I run the installer, but the function still detects that the internet connection is on, and I get the message box with "connection to internet was verified"

How do I solve this?

Thanks.

Joel
13th March 2004 00:24 UTC

Are you sure that you have the correct sintax of the plugin?

Joost Verburg
13th March 2004 12:45 UTC

Maybe it will always report online when there is a permanent network connection. Try it on a system with dial-up access.

Yathosho
13th March 2004 12:53 UTC

i can confirm what joost said

janedoe2003
13th March 2004 14:58 UTC

Most likely, the cause for this behavior is that the macro relies on the InternetGetconnectionState(Ex)() API in WININET.DLL which ships with IE. As you've seen, this API is _not_ reliable (just unplug the cable on a host that connects through a router...)

After searching more, I think the least bad solution is to connect out to some IP address that you hard-coded... but that won't do you any good if the client host is running a firewall which prevents any unauthorized outgoing connections. Rats :-)

Fred.