Solved

netbios(NCB)

Posted on 1999-01-26
3
484 Views
Last Modified: 2013-12-03
Calling netbios(NCB) in Win98 to send a broadcast over the
LAN using NETBEUI returns without error but doesn't send
the broadcast.
The same program runs properly under DOS 6.22 by using
int 5Ch. In Win98 I call netbios(NCB) instead.
Is there something to pay attention to ?
Thanks
 
0
Comment
Question by:mimicrosoft
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 3

Accepted Solution

by:
stefanr earned 200 total points
ID: 1419278
By experience from Windows NT I suspect that you are using a LANA number that is not connected to the proper protocol on the other machine(s). There is one LANA number for each one of the installed network cards AND each protocol. There is no simple way of knowing which LANA number that corresponds to which card and protocol (at least programatically). Therefore you have to test all available LANA numbers, and then use the one(s) that works, or simply broadcast on all LANA numbers in turn (the 'ncb_lana_num' member in the NCB struct).
0
 

Author Comment

by:mimicrosoft
ID: 1419279
Thank you very much for your hint. I've found the right ncb_lana_num experimentally and my test-program runs properly now.
Do you mean retrieving the wanted ncb_lana_num by using the adapter-status-command could be the right way ?

Remark:
I've found a difference to DOS, because adding the same local
name to the name-table again returns a new ncb_num  and doesn't return a duplicate-name-error as expected.

Regards,

Gerhard
0
 
LVL 3

Expert Comment

by:stefanr
ID: 1419280
It is hard to know programatically which LANA number to use when communication with different machines, so the best way is to enumerate all possible LANA numbers using the NCBENUM command, and then send to all of them in turn. I'm not sure if it works on Windows 98 though.
If not, maybe sending to the numbers 0 to 16 or some other maximum value would work. You could perhaps test which numbers works by checking the return code. If it is NRC_BRIDGE it would mean that the LANA number is invalid. I think that the numbers are consecutive, so the first invalid number would exclude all higher numbers too.
I do not think that the NCBSSTAT command would be so useful in this case, since it is used when the LANA number is known already.
If you were using a stream connection instead of a broadcast, the method above could be refined further. After having found the valid LANA numbers, you can test which LANA number(s) that is actually connected to the remote application by doing some custom handshaking. Send a custom message to each one of the valid LANA numbers, and let the remote application send back a custom ACK message on the LANA number(s) on that machine where the message were received. Then you could select a single LANA number on each machine (the LANA numbers are most likely different on each one) to communicate between them.
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

zlib is a free compression library (a DLL) on which the popular gzip utility is built.  In this article, we'll see how to use the zlib functions to compress and decompress data in memory; that is, without needing to use a temporary file.  We'll be c…
What my article will show is if you ever had to do processing to a listbox without being able to just select all the items in it. My software Visual Studio 2008 crystal report v11 My issue was I wanted to add crystal report to a form and show…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question