AndyAinscow
asked on
CSockets from a beginner
I would like to check if there are other copies of an app (from me) running on other PC's in a network.
I have never used CSockets but I think they could be a way to go.
So.
Can an app on PC1 check if PC2 is running the same app via a CSocket.
Does this require any installed on the server to function.
What happens if for example the server is running novell.
Would firewalls on the PC's block communication.
And finally how rapid would the response be (assuming the app can respond immediately on reception of the query)
I have never used CSockets but I think they could be a way to go.
So.
Can an app on PC1 check if PC2 is running the same app via a CSocket.
Does this require any installed on the server to function.
What happens if for example the server is running novell.
Would firewalls on the PC's block communication.
And finally how rapid would the response be (assuming the app can respond immediately on reception of the query)
ASKER
'If the port that you are usiing for the communication is blocked in the firewall, will block the communication'
Oh Dear. Not what I want but I suspected that could be the case. Can one detect if a firewall is installed and not letting the connection be made? At least then I could 'force' the user to modify the firewall settings.
Do you know about the speed?
'What about DCOM and RPC?
I'm not familiar in that'
I also know little about these.
Maybe more explanation,
I want to be able to limit the number of users at any one time using the app. Licencing eg max 3 concurrent users.
I have thought of keeping a file on the server which will keep details of each user as they login and remove them as they close the app. I can also think of ways around this strategy so I am investigating other possible ways.
Oh Dear. Not what I want but I suspected that could be the case. Can one detect if a firewall is installed and not letting the connection be made? At least then I could 'force' the user to modify the firewall settings.
Do you know about the speed?
'What about DCOM and RPC?
I'm not familiar in that'
I also know little about these.
Maybe more explanation,
I want to be able to limit the number of users at any one time using the app. Licencing eg max 3 concurrent users.
I have thought of keeping a file on the server which will keep details of each user as they login and remove them as they close the app. I can also think of ways around this strategy so I am investigating other possible ways.
>> I have thought of keeping a file on the server which will keep details of each user as they login and remove them as they close the app
Yes, You can keep that user info in Server memory itself- in a structure array or something like that.
>> At least then I could 'force' the user to modify the firewall settings.
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.
Rosh :)
Yes, You can keep that user info in Server memory itself- in a structure array or something like that.
>> At least then I could 'force' the user to modify the firewall settings.
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.
Rosh :)
ASKER
>> At least then I could 'force' the user to modify the firewall settings.
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.
OK. PC1 opens a socket and broadcasts "hello, Ive started"
How do I detect that a lack of response is that no other PC on the network is running my app rather than a firewall has gone STOP. ALERT. INTRUDER. ***** OFF
Absence of evidence is not evidence of absence!
the port for the communication should be a variable, so user can chage the socket port. If any other application is using the same port user can change that thru a settings program.
OK. PC1 opens a socket and broadcasts "hello, Ive started"
How do I detect that a lack of response is that no other PC on the network is running my app rather than a firewall has gone STOP. ALERT. INTRUDER. ***** OFF
Absence of evidence is not evidence of absence!
All the messages are passed thru the Server.
Clients will send messages to the Server, Server have the list of all clients and will send the message to other clients that are in the Server list.
This Server list contain only the successful logged in clients
Rosh :)
Clients will send messages to the Server, Server have the list of all clients and will send the message to other clients that are in the Server list.
This Server list contain only the successful logged in clients
Rosh :)
ASKER
So does a 'master' program need to be installed and running on the server?
Do you have an example?
Do you have an example?
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
I'll have a look later or tomorrow. No more time now.
Thanks.
Thanks.
Okay
Rosh :)
Rosh :)
ASKER
Hi Roshmon
I've downloaded the netmsg-fxx. It's rather complex, I'll need a little time to investigate it further and see if it is usefull.
I'll get back asap.
I've downloaded the netmsg-fxx. It's rather complex, I'll need a little time to investigate it further and see if it is usefull.
I'll get back asap.
Okay, All the Best
Rosh :)
Rosh :)
ASKER
Hi Rosh,
I'm still not convinced this is really what I require. It's a possibility but is the most appropriate for my situation.
Having something running on a server really restricts it to windows based server environments.
Thanks for your comments and the link.
I'm still not convinced this is really what I require. It's a possibility but is the most appropriate for my situation.
Having something running on a server really restricts it to windows based server environments.
Thanks for your comments and the link.
>> Would firewalls on the PC's block communication
If the port that you are usiing for the communication is blocked in the firewall, will block the communication.
What about DCOM and RPC?
I'm not familiar in that, guess that also will work
Rosh :)