TCP server/client - PXI RT - Windows - Linux

Dear all,
I'm sorry in advance for such a newbie-question, but I could not figure it out with the help of the existing posts here.
My situation: LV 7.1 installed on Win XP and running on the RT target PXI 1031. In this PXI I have the NI PXI 8146 RT module. To this module I have connected a Fluke DMM via GPIB (btw changing to ISA driver instead of PCI was necessary for the 8146 module), all that works OK and I can read the voltage from DMM with no problem.
Now I have an Ethernet switch between the PXI, Win XP box and a Linux laptop. I can ping from Win box and Linux laptop to the PXI and to each other, connection is OK. What I want to do now is to get the voltage from the DMM via PXI into my laptop at least twice per second. The laptop will then be replaced by some fast data acquisition system running (independently from LV) on Linux so now I'm just trying to get the voltage value into Linux...
I tried "Simple Data Client" and "...Server" vi-s but no success yet. My networking skills are at "ping" level... :-)
Any hint would be appreciated. M.

Hello miraz,
there is a very powerful library for your exact use case:
http://zone.ni.com/devzone/cda/tut/p/id/4095
Alas, it requires at least LabVIEW 8.2.1.
Maybe the RT FIFO Example which is also available for LabVIEW 7.1 will help you:
http://zone.ni.com/devzone/cda/epd/p/id/1898
Regards,
Johannes
NI Germany 629650

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New files and folders on a Linux client mounting a Windows 2012 Server for NFS share do not inherit Owner and Group when SetGID bit set

Problem statement
When I mount a Windows NFS service file share using UUUA and set the Owner and Group, and set the SetGID bit on the parent folder in a hierarchy. New Files and folders inside and underneath the parent folder do not inherit the Owner and Group permissions
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I am given to understand from this Microsoft KnowledgeBase article (http://support.microsoft.com/kb/951716/en-gb) the problem is due to the Windows implmentation of NFS Services not supporting the Solaris SystemV or BSD grpid "Semantics"
However the article says the same functionality can acheived by using ACE Inheritance in conjunction with changing the Registry setting for "KeepInheritance" to enable Inheritance propagation of the Permissions by the Windows NFS Services.
1. The Precise location of the "KeepInheritance" DWORD key appears to have "moved" in Windows Server 2012 from a Services path to a Software path, is this documented somewhere? And after enabling it, (or creating it in the previous
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2. All of the references on demonstrating how to set an ACE to achieve the same result "currently" either lead to broken links on Microsoft technical websites, or are not explicit they are vague or circumreferential. There are no plain Examples.
Can an Example be provided?
3. Is UUUA compatible with the method of setting ACE to acheive this result, or must the Linux client mount be "Mapped" using an Authentication source. And could that be with the new Flat File passwd and group files in c:\windows\system32\drivers\etc
and is there an Example available.
Scenario:
Windows Server 2012 Standard
File Server (Role)
+- Server for NFS (Role) << -- installed
General --
Folder path: F:\Shares\raid-6-array
Remote path: fs4:/raid-6-array
Protocol: NFS
Authentication --
No server authentication
+- No server authentication (AUTH_SYS)
++- Enable unmapped user access
+++- Allow unmapped user access by UID/GID
Share Permissions --
Name: linux_nfs_client.host.edu
Permissions: Read/Write
Root Access: Allowed
Encoding: ANSI
NTFS Permissions --
Type: Allow
Principal: BUILTIN\Administrators
Access: Full Control
Applies to: This folder only
Type: Allow
Principal: NT AUTHORITY\SYSTEM
Access: Full Control
Applies to: This folder only
-- John Willis, Facebook: John-Willis, Skype: john.willis7416

I'm making some "major" progress on this problem.
1. Apparently the "semantics" issue to honor SGID or grpid in NFS on the server side or the client side has been debated for some time. It also existed as of 2009 between Solaris nfs server and Linux nfs clients. The Linux community defaulted to declaring
it a "Server" side issue to avoid "Race" conditions between simultaneous access users and the local file system daemons. The client would have to "check" for the SGID and reformulate its CREATE request to specify the Secondary group it would have to "notice"
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"inheritance" scheme to worry about honoring.. that could place it in conflict with remote access.. and push the responsibility "outwards" to the nfs client.. introducing a race condition, necessitating "locking" semantics.
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[-can-] update or promote an existing ACE to "Inheritable"
Here are the pertinent statements -
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"Note About the Permissions That Are Set by NFS Clients
The KeepInheritance option only applies ACEs that have inheritance enabled. Any permissions that are set by an NFS client will
only apply to that file or folder, so the resulting ACEs created by an NFS client will
not have inheritance set."
"So
If you want a folder's permissions to be inherited to new subfolders and files, you must set its permissions from the Windows NFS server because the permissions that are set by NFS clients only apply to the folder itself."
http://support.microsoft.com/default.aspx?scid=kb;en-us;321049
3. I have set up a Windows 2008r2 NFS server and mounted it with a Redhat Enteprise Linux 5 release 10 x86_64 server [Oct 31, 2013] and so far this does appear to be the case.
4. In order to mount and then switch user to a non-root user to create subdirectories and files, I had to mount the NFS share (after enabling Anonymous AUTH_SYS mapping) this is not a good thing, but it was because I have been using UUUA - Unmapped Unix
User Access Mapping, which makes no attempt to "map" a Unix UID/GID set by the NFS client to a Windows User account.
To verify the Inheritance of additional ACEs on new subdirectories and files created by a non-root Unix user, on the Windows NFS server I used the right click properties, security tab context menu, then Advanced to list all the ACEs and looked at the far
Column reflecting if it applied to [This folder only, or This folder and Subdirectories, or This folder and subdirectories and files]
5. All new Subdirectories and files createdby the non-root user had a [Non-Inheritance] ACE created for them.
6. I turned a [Non-Inheritance] ACE into an [Inheritance] ACE by selecting it then clicking [Edit] and using the Drop down to select [This folder, subdirs and files] then I went back to the NFS client and created more subdirs and files. Then back to the
Windows NFS server and checked the new subdirs and folders and they did Inherit the Windows NFS server ACE! - However the UID/GID of the subdirs and folders remained unchanged, they did not reflect the new "Effective" ownership or group membership.
7. I "believe" because I was using UUUA and working "behind" the UID/GID presentation layer for the NFS client, it did not update that presentation layer. It might do that "if" I were using a Mapping mechanism and mapped UID/GID to Windows User SIDs and
Group SIDs. Windows 2008r2 no longer has a "simple" Mapping server, it does not accept flat text files and requires a Schema extension to Active Directory just to MAP a windows account to a UID/GID.. a lot of overhead. Windows Server 2012 accepts flat text
files like /etc/passwd and /etc/group to perform this function and is next on my list of things to see if that will update the UID/GID based on the Windows ACE entries. Since the Local ACE take precedence "over" Inherited ACEs there could be a problem. The
Inheritance appears to be intended [only] to retain Administrative rights over user created subdirs and files by adding an additional ACE at the time of creation.
8. I did verify from the NFS client side in Linux that "Even though" the UID/GID seem to reflect the local non-root user should not have the ability to traverse or create new files, the "phantom" NFS Server ACEs are in place and do permit the function..
reconciling the "view" with "reality" appears problematic, unless the User Mapping will update "effective" rights and ownership in the "view"
-- John Willis, Facebook: John-Willis, Skype: john.willis7416

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Hi,
I have Oracle 8i Client running on Windows 2000 Server. I need to connect to Oracle 8i Server running on Sun Box.
I have problems with connectivity.
When I do tnsping <service name>, I am geting the followiing
error:
C:\>tnsping <Instance name>
TNS Ping Utility for 32-bit Windows: Version 8.1.7.0.0 - Production on 04-FEB-20
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(c) Copyright 1997 Oracle Corporation. All rights reserved.
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Thanks
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Hi,
I have Oracle 8i Client running on Windows 2000 Server. I need to connect to Oracle 8i Server running on Sun Box.
I have problems with connectivity.
When I do tnsping <service name>, I am geting the followiing
error:
C:\>tnsping <Instance name>
TNS Ping Utility for 32-bit Windows: Version 8.1.7.0.0 - Production on 04-FEB-20
02 16:37:01
(c) Copyright 1997 Oracle Corporation. All rights reserved.
Attempting to contact (ADDRESS=(PROTOCOL=TCP)(HOST=<IP Address>)(PORT=1521)) TNS-12541: TNS:no listener
Can any one help me out
Thanks
mka

Handle Received data of Multiple TCP clients on TCP Server by displaying them into Datagrid

Hello All,
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void m_Terminal_MessageRecived(Socket socket, byte[] buffer)
string message = ConvertBytesToString(buffer, buffer.Length);
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System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
d.GetChars(bytes, 0, iRx, chars, 0);
string szData = new string(chars);
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Now i want those data of the TCP clients to be parsed into 4 bits first and display it in 8 columns (32/4=8) of (say) datagrid as each 4 bit represents some characteristics of the TCP client. The same thing
should work for next TCP client on second row of datagrid
If mean it's a Windows Forms application and you want to display those bits in a DataGridView control, then please see these threads:
Add row to datagridview
Programmatically add new row to DataGridView
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PNP,
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Hi All,
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Please take a moment to Vote as Helpful and/or Mark as Answer where applicable. Thanks.

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Regards
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Hi,
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Note:
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>   * explorer.exe is blocked already, but users are able to enter the
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Mal ein
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Anoop

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Are there any moderators checking this forum?
I called Oracle support and requested a shipment for Oracle9i for Windows Server 2003. I made sure that whatever media pack they were sending me what explicitly for 2003. It was for both 2000 & 2003 however the client/database CDs for 2003 are only for 64-bit.
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Best regards,
Disposable_Hero

Of course, but i don�t think it is the model (as said before it works fine in a single thread swing app)
Here�s the code:
public class LogTableModel extends AbstractTableModel{
private Vector dataVector;
private Vector filterVector;
private String[] columnIdentifiers;
private Vector filteredbyProcess;
private Vector filteredbyLoglevel;
private boolean bEnableRefresh;
/** Creates a new instance of LogTableModel */
public LogTableModel() {
dataVector=new Vector(0);
columnIdentifiers=new String[]{"LogTime","HostName","IP","ProcessName","LogLevel","Handle","PID","TID","LogData"};
filteredbyProcess=new Vector(0);
filteredbyLoglevel=new Vector(0);
filterVector=new Vector(0);
bEnableRefresh=true;
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this.bEnableRefresh=bEnableRefresh;
if(bEnableRefresh){
this.buildIndexListBasedOnFilter();
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dataVector.add(row);
if(bEnableRefresh)
this.buildIndexListBasedOnFilter();
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filterVector.add(filter);
if(filter.isActive())
this.buildIndexListBasedOnFilter();
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int i;
for(i=0;i<filterVector.size();i++)
if(((Filter)filterVector.elementAt(i)).getName().equals(name))
break;
Filter tmp=(Filter)filterVector.elementAt(i);
tmp.setActive(active);
if(active)
this.buildIndexListBasedOnFilter();
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int i;
for(i=0;i<filterVector.size();i++)
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tmp.setLoglevel(Loglevel);
if(tmp.isActive()==false)
this.buildIndexListBasedOnFilter();
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filteredbyProcess.clear();
filteredbyLoglevel.clear();
applyProcessFilter();
applyLoglevelFilter();
if(bEnableRefresh)
this.fireTableDataChanged();
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Filter filter=null;
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filter=(Filter)filterVector.elementAt(j);
line=(LogLine)dataVector.elementAt(i);
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line.setHidden(true);
break;
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line.setHidden(false);
if(line.getHidden()!=true)
filteredbyProcess.add(new Integer(i));
private void applyLoglevelFilter(){
for(int i=0;i<filteredbyProcess.size();i++){
int index=((Integer)filteredbyProcess.get(i)).intValue();
LogLine line=(LogLine)dataVector.elementAt(index);
for(int j=0;j<filterVector.size();j++){
if(((Filter)filterVector.elementAt(j)).getName().equals(line.getProcessName())){
Filter filter=(Filter)filterVector.elementAt(j);
if((filter.getLoglevel()&line.getLogLevelAsInt())!=line.getLogLevelAsInt())
line.setHidden(true);
else
filteredbyLoglevel.add(new Integer(index));
break;
public synchronized String getColumnName(int columnIndex){
return columnIdentifiers[columnIndex];
public synchronized void clearData(){
dataVector.clear();
filteredbyProcess.clear();
filteredbyLoglevel.clear();
public synchronized int getColumnCount() {
return columnIdentifiers.length;
public synchronized int getRowCount() {
return filteredbyLoglevel.size();
public synchronized Object getValueAt(int rowIndex, int columnIndex) {
int iIndex=((Integer)filteredbyLoglevel.get(rowIndex)).intValue();// hier krachts warum???
LogLine tmp=(LogLine)dataVector.elementAt(iIndex);
switch(columnIndex){
case 0:
return tmp.getLogTime();
case 1:
return tmp.getHostName();
case 2:
return tmp.getIP();
case 3:
return tmp.getProcessName();
case 4:
return tmp.getLogLevel();
case 5:
return tmp.getHandle();
case 6:
return tmp.getProcessID();
case 7:
return tmp.getThreadID();
case 8:
return tmp.getLogData();
default:
return null;

TCP server/client - PXI RT - Windows - Linux

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