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[SOLVED] check that a intra net server listens to a TCP socket
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Topic: [SOLVED] check that a intra net server listens to a TCP socket (Read 1920 times)
guest58172
Guest
[SOLVED] check that a intra net server listens to a TCP socket
«
on:
February 08, 2016, 03:32:12 pm »
Under windows I have to wait until a local server starts to listen to a particular TCP port.
To do so:
Code: Pascal
[Select]
[+]
[-]
function
checkSocket
:
boolean
;
var
prt
:
word
=
9166
;
cli
:
TInetSocket
=
nil
;
begin
sleep
(
100
)
;
// because this proc is looped
result
:
=
false
;
try
try
cli
:
=
TInetSocket
.
Create
(
'localhost'
,
prt
)
;
except
// fail to connect error interpreted as "the server occupies the port"
result
:
=
true
;
end
;
finally
if
assigned
(
cli
)
then
cli
.
Free
;
end
;
end
;
It seems to work however once it returns true, the server fails to create its connection to the socket because it looks like my checker blocks the port.
What's the proper way to check if a port is available or not ?
Logged
balazsszekely
Guest
Re: check that a intra net server listens to a TCP socket
«
Reply #1 on:
February 08, 2016, 04:03:23 pm »
Run with TProcess "netstat -a" then parse the result.
Logged
guest58172
Guest
Re: check that a intra net server listens to a TCP socket
«
Reply #2 on:
February 08, 2016, 04:07:15 pm »
Yeah, this is what I gonna do. I'll wait a bit before considering this Q as solved to see if anyone has a solution using a socket, which would be cleaner.
Logged
balazsszekely
Guest
Re: check that a intra net server listens to a TCP socket
«
Reply #3 on:
February 08, 2016, 04:28:00 pm »
Maybe this helps:
Code: Pascal
[Select]
[+]
[-]
cli
.
SocketOptions
:
=
cli
.
SocketOptions
-
[
soKeepAlive
]
;
Alternatively you could use the closesocket api(
https://msdn.microsoft.com/en-us/library/windows/desktop/ms737582%28v=vs.85%29.aspx
).
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