Solved

DNS returns WSANO_DATA. Reason ?

Posted on 1997-07-10
7
1,265 Views
Last Modified: 2013-12-23
Hi.
Does somebody know what can be reason for follow :
gethosbyname() sometime returns WSANO_DATA, after I've used
Auto Connect feature in Win95.
If I start my program when PC is already connected
via DialUp - everything is OK.
TIA.

0
Comment
Question by:pangofil
  • 3
  • 3
7 Comments
 
LVL 3

Expert Comment

by:hpierson
ID: 1546777
Are you using the Win95 Winsock?

When using any winsock, the first call is always to WSAStartup. This fills a structure with information about the winsock you are using, so that TCP/IP programs can be made aware of any limitations that exist with your winsock. The WSANO_DATA response comes when the winsock app looks to the WSAData structure, and finds that it has not been filled in completely.

It sounds like you program is starting before WSAStartup completes when you use autoconnect. Watch carefully and see if you can tell whether your program is starting before you see the login complete.

You might also check to make sure that when you right click the  internet icon, the information on the connection tab is correct.

Harry
0
 

Author Comment

by:pangofil
ID: 1546778
Yes I'm using Win95 winsock.
And I call WSAStartup() before any network action.
And something else :
  I'm writing 16-bit program so i call 32-bit exe file,
  which performs some WinSock actions ( gethostbyname() )
  for autoconnecting (16-bit Winsock can't perform autoconnect).
  After host resolved the 32-bit app PostMessage about connecting
  result. After what 16-bit app continues ( tries to resolve host   etc ... ). And here ( after WSAStartup has completed )
  some time I get the problem, described above.
0
 
LVL 3

Expert Comment

by:Ikon
ID: 1546779
ask in the programming section
0
Give your grad a cloud of their own!

With up to 8TB of storage, give your favorite graduate their own personal cloud to centralize all their photos, videos and music in one safe place. They can save, sync and share all their stuff, and automatic photo backup helps free up space on their smartphone and tablet.

 

Author Comment

by:pangofil
ID: 1546780
Thanks for responses - I found out that's a problem.
That was becasuse I mixed 16-bit & 32-bit.
Must load 16-bit Winsock after AutoConnection has been completed.
0
 
LVL 3

Expert Comment

by:hpierson
ID: 1546781
Sounds to me like I told you exactly where to look, doesn't it?

And the reason you rejected my answer is...?
0
 

Author Comment

by:pangofil
ID: 1546782
To hpierson :
May be You're right.
I just didn't understand your answer ( it didn't help me to solve  the problem ).
Just answer again - I'll accept it.

PS : Sorry for nasty English - I'm working on it
0
 
LVL 3

Accepted Solution

by:
hpierson earned 100 total points
ID: 1546783
Pangofil,

I hope I didn't come across the wrong way,...it seems from your solution that you realized that the problem was in the general area I described.

By the way, I have no problem with your English.


Best Regards,

Harry

Are you using the Win95 Winsock?

When using any winsock, the first call is always to WSAStartup. This fills a structure with information about the winsock you are using, so that TCP/IP programs can be made aware of any limitations that exist with your winsock. The WSANO_DATA response comes when the winsock app looks to the WSAData structure, and finds that it has not been filled in completely.

It sounds like you program is starting before WSAStartup completes when you use autoconnect. Watch carefully and see if you can tell whether your program is starting before you see the login complete.

You might also check to make sure that when you right click the internet icon, the information on the connection tab is correct.

Harry
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Sometimes you might need to configure routing based not only on destination IP address, but also on a combination of destination IP address (or hostname) and destination port number. I will describe a method how to accomplish this with free tools. …
Trying to figure out group policy inheritance and which settings apply where can be a chore.  Here's a very simple summary I've written which might help.  Keep in mind, this is just a high-level conceptual overview where I try to avoid getting bogge…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

943 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

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now