I am doing direct I/O on a parallel port which is fine and necessary for speed. I would like to enumerate the available ports to offer the user a choice of ports at setup time rather than a tedious trawl through device manager to read the address manually. Does anyone know a means of doing this please?
Many thanks,
Brian
According to this Microsoft article, for Win2K and newer, you can find details of parallel-connected devices in the registry at HKLM\SYSTEM\CurrentControlSet\Enum\LPTENUM.
Related
I have tried using ESP-CoAP but the coapclient.ino example does not work for me. The server in this example is 129.132.15.80. Is there any other server I can use to test my code? I have also tried coap.me but this code only accepts IP addresses. Are there any alternatives to this library that are regularly maintained?
About the question for test-servers:
Many OS offers you a way to resolve a address as "coap.me" to their numeric address (e.g. unix nslookup coap.me => 134.102.218.18). The open source project Eclipse/Californium offers a sandbox as well (nslookup californium.eclipseprojects.io => 104.196.15.150). You may also try to run Californium's Plugtest Server locally (requires installed java).
In all cases, it's a good idea to get common with ip-capture tools as tcpdump or wireshark. A very first introduction may be found here
About the question for maintained c-implementations:
libcoap is a very common one. But I don't know, if there is a "out of the box" ESP 32 port available.
Is it possible to use kstat to get information about which processes have which ports open? I've looked into how lsof does it and apparently they read volatile kernel memory, which kstat seems to give access to (please correct me if I'm wrong).
I was just wondering if anyone knows how to filter kstat to display information about which processes a port has open. Perhaps which module should I look at?
On Solaris 11.2, you can use netstat -u to obtain that information. Per the man page:
–u
Lists the user, process id, and the program which originally
created the network endpoint or controls it now.
On earlier versions of Solaris, there's no easy way - you can use pfiles to some degree, but its utility in identifying sockets is limited.
Also see What process is listening on a certain port on Solaris?
No, kstat doesn't store process level information. Moreover, kstat doesn't give access to volatile kernel memory but only to specific kernel statistics.
Finally, you shouldn't have started a new question instead of following up here.
I've searched this subject in stackoverflow and found out that a telnet library would help, and I found a telnet lib here: C# Telnet Library
but I don't know how I can use a telnet library to open a port in my router. I'm using an AT&T 2wire router. Any hints on how I can do this?
You can't. The 2wire router is an island unto itself, if it decides to block a port nothing external can (or should) be able to change that. You are on the wrong track, and would need to restate your goals in order to get a useful answer.
UPnP and other "Hole Punching" techniques do exist: but you'll be in a world of hurt if you try to reply on them for any widespread deployment.
Perhaps you meant to open a connection to a remote server and then establish two way communication. That is easy... and how other games and tools get the job done.
Technically speaking you should not be able to. You shouldn't have outside programatic access to a router to open a port if it's blocked.
If what you mean is opening a port for communication (that is not blocked) then you can simply create Sockets with the address and port (ex. localhost 7777) to establish inter process communication or simply communication with another server.
As I mentioned in a comment below there are ports that are available for use (in C# this can be easily tested, a quick google search will find you many snippets of code for testing if a port is open). A simple approach is to simply start at port 1024 (I believe this is the correct lower bound for ports that should be used by applications, someone correct me if I'm wrong) and just start counting up until you find a port that is available, if you find you've reached some upper limit you can simply report that a connection cannot be made. I hope this clears up a little more and if I have time I will try to find some code I have for this and edit it in but honestly a quick search can net you similar code for checking ports in C#.
i have a device (cash drawer) and i would like to directly communicate with the device. I know that its on address f1. Also openbit is 01.
As i've understood so far, i'd need to send 1 to memory address f1 and the cash drawer should open. Though using asm, i get access violation. Then again i've read that windows does not let you communicate directly to device i/o addresses (need to use win). What would be the correct way to send the data to that address.
Note that i cannot use drivers, because i can't communicate with the driver inside my application.
Op. system is win7.
Thanks in advance!
There was a library called inpout32.dll that allowed direct port access you can find it here
http://logix4u.net/Inpout32.dll_Discussion/write_DELPHI_for_inpout32.dll.html
But i don't know if supports windows 7.
In addition to the excellent suggestions above, check out this delphi code for writing and reading I/O. We have used the GWIOPM to do what you are asking, but note that it will be ok for 32-bit versions of Windows up to W7 etc (as is the case for most 'free' drivers). For 64-bit Windows you need a signed kernel driver. For this there are few things available at the moment. We had to write our own.
Why can't you communicate with the driver from your application? It's the best way for ring 3 application to talk with hardware in a safe manner.
However, if you really insist using drivers, you can try going to ring 0 and do direct access. It's much harder than in previous Windows versions (XP and before) but it's possible. I haven't done it myself since I don't have Windows 7, but you can try asking in asm programming forum anywhere.
I need to run an equipment audit and to do that I need to obtain the Windows PC, monitor etc. serial numbers.
So I faced with going to each PC and manually writing down the numbers.
Is there a way I can get this programmatically so each user can run a small program and email me the results?
If this information is anywhere, it'd be in WMI (http://en.wikipedia.org/wiki/Windows_Management_Instrumentation) - you could write a VBscript script to query this information and save it to a remote share on a server for example.
Generally no. If your computers are all Dell, though, you might be able to get some information (maybe the serial number?) for the PC itself.
The monitor, if it supports VESA EDID (DDC, EDID, EEDID), may also include a 32 bit serial number - which may or may not have any relation to the serial number printed on the monitor's label. You may be able to access this through the display driver - Windows has access to portions of it (to display monitor resolution and timing) so I expect the manufacturer/model/serial number is stashed somewhere as well.
However, making such a program that would work across all systems and monitors would likely be much more work than simply going to each station and recording it, unless all the systems have the same hardware.
Good luck!
-Adam
I am not quite sure if this is exactly what you want, but there is pay software made by DameWare that allows you to easily remote connect to other machines and get lots of information. I haven't used it much yet, but I think there is a way to make batch scripts so it can go pull information like that for you, or see what apps are installed on the machines. Even worse case though, you don't have to run to each machine. (I am assuming you mean SN like the MS product ID)
WMI is definitely the way to go. You can get quite a bit of useful audit information through that API.
Michael Baird appears to have written a VBS script to read the EDID information. The script reads and parses the monitor EDID information from the registry in order to retrieve asset information.
http://cwashington.netreach.net/depo/view.asp?Index=980&ScriptType=vbscript