Sending string of bits from PXI to NAS
Good evening, I expose my problem:
I should send a string of bits from PXI to a memory type NAS, using the FTP protocol. I do this every 0.72 ms, then use a timedloop with a frequency of 1MHz. But implementing a timer sending time is very different from what I expect. My question is whether this problem is due to the FTP put buffer.vi that takes more time to send the string.
look your response
Attachments:
Immagine.jpg 178 KB
I Dont think a FTP server is meant for being accessed every 0.72s
I would use the queue functions built into labview for buffering the data and access the FTP server at a much lower rate, every minute or every hour...
Regards Claus
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Send arraylist to swings from servlet
Hi,
I send string to jsp from swings using URL(pass as a query string)
And then call servet from jsp(submit some values to this servlet from jsp)
Now i want to send ArrayList to my swings ,
How it is,
i know call servlet from swings,retrive values from servlet to swings. This is two way communication,
But now my requirement is one way, i didn't call servlet directly from swings, i call from jsp
Help me,
Thanks in advanceThanks for reply
i write code in my swing as
ArrayList pdetails;
URL url=new URL(getCodeBase()+"sample.jsp");
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con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
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AppletContext context=getAppletContext();
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<%@page import="java.io.*,java.util.*"%>
<%
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at org.apache.jsp.sample_jsp._jspService(org.apache.jsp.sample_jsp:52)
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I have a PXI chassis with a PXI-8101 controller. It is set up with a realtime operating system. I am communicating to it with a PC with a Windows operating system. I am trying to send variable length string messages from my PXI system to my PC.
On the PC I have a LabWindows application which can send and receive data with the PXI system. I am attempting to send error messages from the PXI system to the PC on ethernet. I am able to send numerical data between them but not the string messages. The PXI software runs to the function call CNVCreateArrayDataValue() and steps into it but never returns. It only has this problem when the parameter CNVDataType is CNVString; when I change CNVDataType to CNVBool it does not have this problem. I am new to this PXI realtime so would appreciate the help. Below is the code on my PXI system which sends these text messages.
In the beginning of RTMain I create the Writer
CNVCreateBufferedWriter("\\\\localhost\\system\\" REG_CAL_ERROR_STRING, 0, 0, 0, 64, 5000, 0, &gErrorPublisher);
Then I call a function with a string in the parameter list:
void SendRT_ErrorMessage(char* message)
CNVData data=0;
int error;
char error_str[256];
int i;
char out_str[ERROR_STRN_SIZE*4];
strcpy(out_str,message);
size_t arrayDims= ERROR_STRN_SIZE;
arrayDims= strlen(message) +1;
error = CNVCreateArrayDataValue(&data, CNVString, out_str, 1, &arrayDims);
if(error<0)
strncpy(error_str, CNVGetErrorDescription(error),256);
// CNVPutDataInBuffer(gErrorPublisher, data, 1000);
CNVSetArrayDataValue(data,CNVString,out_str,1,&arrayDims);
CNVPutDataInBuffer(gErrorPublisher, data, 1000);
CNVDisposeData(data);
Solved!
Go to Solution.I've changed things around and now the application on the realtime operating system on the PXI-8101 does not hang but my host computer does not see the message correctly. It sees some characters but they are not what I sent.
I don't seem to be able to get message out of CNVData data properly. Below is the new code for the PXI-8101 controller and the Host computer LabWindows application.
Here is the code in the PXI-8101 controller now:
CNVCreateWriter("\\\\localhost\\system\\" REG_CAL_ERROR_STRING, 0, 0, 5000, 0, &gErrorPublisher);
void SendRT_ErrorMessage(char* message)
CNVData data=0;
int error;
char error_str[256];
int i;
char out_str[ERROR_STRN_SIZE*4];
strcpy(out_str,message);
size_t arrayDims= ERROR_STRN_SIZE;
arrayDims= strlen(message) +1;
error = CNVCreateScalarDataValue( &data,CNVString,out_str);
if(error<0)
strncpy(error_str, CNVGetErrorDescription(error),256);
CNVWrite(gErrorPublisher, data, 1000);
CNVDisposeData(data);
And here is the code in the Host computer LabWindows application:
sprintf(path, "\\\\%s\\system\\%s", address, REG_CAL_ERROR_STRING);
CNVCreateSubscriber(path, ErrorMessageCallback, 0, 0, 10000, 0, &gErrorMessageSubscriber);
static void CVICALLBACK ErrorMessageCallback(void * handle, CNVData data, void * callbackData)
char message[ERROR_STRN_SIZE];
CNVGetScalarDataValue(data,CNVString,(void *)message);
(void)SetCtrlVal(panelHandle,PANEL_TEXTBOX_DEBUG_MSG,"got something\n");
(void)SetCtrlVal(panelHandle,PANEL_TEXTBOX_DEBUG_MSG,message);
(void)SetCtrlVal(panelHandle,PANEL_TEXTBOX_DEBUG_MSG,"\n");
CNVDisposeData(data);
You can see that I output a message "got something" so that I know I got the callback but the next line is a gibberish message "HÊl " -
Sending String Data of 64 kilo bytes to Remote Function Module
Hi,
I have an RFC call from JAVA and I need to send string data to the FM. The maximum size of the data that I can send from java is 64 kilo bytes (Functional requirement). I want to receive this data as a table's parameter in the FM. Table's parameters data type can only be structure's which are FLAT-LINED. So if I use STRNIG as the data type for receiving the data from JAVA the RFC doesnt allow me (As this makes the structure NON FLAT LINED which RFC will not allow as data type for tables parameter). So I have to use some other data type like CHAR or LCHR. But the maximum size for CHAR and LCHR is around 32 kilo bytes. I need a way to receive 64 kilo bytes of data into the Function Module as a tables parameter.
Thanks in advance
SeshHi!
I think I was pretty near your problem. When talking about table fields, you could a 'parameter' -> field of your table parameter.
Which type? String is out of question, because here length is variable, but you need a constant length definition. I just have a look into help of data, built in ABAP-types. Here C and N can have a length from 1 to 65535 - OK, not 64 KB but only 1 byte missing...
... just made a small test, there is a second border (for non-unicode systems): the total length of the structure can't exceed 65535. If you need additional fields, define a second table parameter and place your additional fields in a second table. You can't define a link field (would need some space), so you have to go for a '1st line of data matches 1st line of attributes'-definition.
I'm still a little bit curious: what kind of data you are sending?
Regards,
Christian -
Sending /receiving object data from JavaNIO bytebuffer
Hello All,
i have designed a real time Physics simulation with javanio , which is about moving balls simultaneously (real time) on multiple clients.
Currently, i m sending the coordinates of one ball with string parsing, but now i want to move multiple balls and want to have some generic mechanism other than sending string, so i create 4 balls on server.
my design with string base is already running (one ball which is running from server, receiving coordinates as string on clients now i want more balls so i have problem to send the coordinate for each ball and receiving the same on client to draw while there are no reference attach to those which ball correspond to which ball on client) but i need little bit generic solution which can be valid for other simulations too.
This should be realized by sending the reference of each ball but i don't have idea how to realized that with java byte buffer and with javanio overall.
how i can realized, so that coordinates of each ball correspond to same ball on client (which i created on client too), and each ball can be move according to its received coordinates from the sever.
I have the problem with implementation, if somebody help me with code example , it would be great, anyway which can be generic for sending simulation data like object coordinates other than strings can be acceptable(if somebody did similar work) but it should implement the usecase as i described.
Thanks,
Jibbylala
PS: i saw this post:http://www.coderanch.com/t/276259/Streams/java/Convert-ByteBuffer-object
they are sending the whole object but i just wanted to send
Ball.X ,Ball[i].Y and receive the same at client sit
Edited by: 805185 on Mar 20, 2011 8:29 PMI think the question here is that if you have n balls on the server, and you receive coordinates on the client, how the client will know for which ball the coordinates are meant. The answer is pretty simple: just modify your protocol to send the ball number before you send the coordinates. You say you currently use strings to represent the coordinates. Say your string currently looks like this: x|y, where x is the x-coordinate, | the separator and y the y coordinate. You could modify this string as follows: n|x|y, where n is the ball number, x the x coordinate and y the y coordinate. This way the client knows for which ball the coordinates are meant.
If you want to avoid the string parsing, use the ByteBuffer.putDouble() and ByteBuffer.putInt() methods as suggested by EJP. -
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How to send string data through socket!
Is there any method to send string data over socket.
and if client send string data to server,
How to get that data in server?
Comments please!Thank for your kind answer, stoopidboi.
I solved the ploblem. ^^;
I open the source code ^^; wow~~~~~!
It will useful to many people. I spend almost 3 days to solve this problem.
The program works like this.
Client side // string data ------------------------> Server side // saving file
To
< Server Side >
* Server.java
* Auther : [email protected]
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Server extends JFrame
private JTextField enter;
private JTextArea display;
ObjectInputStream input;
DataOutputStream output;
FileOutputStream resultFile;
DataInputStream inputd;
public Server(){
super("Server");
Container c = getContentPane();
enter = new JTextField();
enter.setEnabled(false);
enter.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent ev){
//None
c.add(enter, BorderLayout.NORTH);
display = new JTextArea();
c.add(new JScrollPane(display),
BorderLayout.CENTER);
setSize(300, 150);
show();
public void runServer(){
ServerSocket server;
Socket connection;
int counter = 1;
display.setText("");
try{
server = new ServerSocket(8800, 100);
while(true){
display.append("Waiting for connection\n");
connection = server.accept();
display.append( counter + " connection is ok.\n");
display.append("Connection " + counter +
"received from: " + connection.getInetAddress().getHostName());
resultFile = new FileOutputStream("hi.txt");
output = new DataOutputStream(resultFile);
output.flush();
inputd = new DataInputStream(
connection.getInputStream()
display.append("\nGod I/O stream, I/O is opened\n");
enter.setEnabled(true);
try{
while(true){
output.write(inputd.readByte());
catch(NullPointerException e){
display.append("Null pointer Exception");
catch(IOException e){
display.append("\nIOException Occured!");
if(resultFile != null){
resultFile.flush();
resultFile.close();
display.append("\nUser Terminate connection");
enter.setEnabled(false);
resultFile.close();
inputd.close();
output.close();
connection.close();
++counter;
catch(EOFException eof){
System.out.println("Client Terminate Connection");
catch(IOException io){
io.printStackTrace();
display.append("File is created!");
public static void main(String[] args){
Server app = new Server();
app.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
app.runServer();
< Client side >
* Client.java
* Auther : [email protected]
package Client;
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Client extends JFrame
private JTextField enter;
private JTextArea display;
DataOutputStream output;
String message = "";
public Client(){
super("Client");
Container c = getContentPane();
enter = new JTextField();
enter.setEnabled(false);
enter.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
//None
c.add(enter, BorderLayout.NORTH);
display = new JTextArea();
c.add(new JScrollPane(display), BorderLayout.CENTER);
message = message + "TT0102LO12312OB23423PO2323123423423423423" +
"MO234234LS2423346234LM2342341234ME23423423RQ12313123213" +
"SR234234234234IU234234234234OR12312312WQ123123123XD1231232" +
"Addednewlinehere\nwowowowwoww";
setSize(300, 150);
show();
public void runClient(){
Socket client;
try{
display.setText("Attemption Connection...\n");
client = new Socket(InetAddress.getByName("127.0.0.1"), 8800);
display.append("Connected to : = " +
client.getInetAddress().getHostName());
output = new DataOutputStream(
client.getOutputStream()
output.flush();
display.append("\nGot I/O Stream, Stream is opened!\n");
enter.setEnabled(true);
try{
output.writeBytes(message);
catch(IOException ev){
display.append("\nIOException occured!\n");
if(output != null) output.flush();
display.append("Closing connection.\n");
output.close();
client.close();
catch(IOException ioe){
ioe.printStackTrace();
public static void main(String[] args){
Client app = new Client();
app.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
app.runClient(); -
How to send a SQUARE WAVE to PXI-6259 over the LAN
howcan I send a SQUARE WAVE to PXI-6259 over the LAN, is
there any example or link any one can send me , thanx in advance.Dear HaI L,
I managed to send a test signal (sine wave) to the device by choosing
the test panel option and choosing Analog output. In the analog output
I could many channels to choose from. ai0, ai1.ai2 and ai3.
I did this by right clicking NI PXI-6259, in the NI DAQmx devices
located in the Devices and Interfaces and choosing test and saw it on
an Oscilloscope without using the NI DAQ OPC capabilities, and I cannot
understand this thing.
1)How can it be possible without making a NI DAQmx channel and Variable?
2) I cannot create any channels in the devices and interfaces located
in My system but I can create NI DAQmx Global Virtual channels easily
in Data neighbourhood in the remote system, Plz tell me why?
3) I want to create a program and choose a channel to send the
signal, can I choose the channel that i create in the remote
system device ? and if yes how can I choose this ?
Thanx in advance.
Sincerely,
Munir Afzal Bhatti.
Attachments:
max.jpg 2305 KB -
Colleagues,
Is it possible to record data directly from PXI-5112 scope card through PXI bus to SCSI RAID array (connected to PXI-8210)?
Which will be the maximum transfer rate for continuous data recording?
Thank you,
Sergey
SergeySergey,
The PXI-8210 can connect to any SCSI 2 compliant device. If the RAID controller is SCSI 2 and appears just like a hard drive in the operating system, then you can send data directly to the RAID array. The problem is that the driver for the PXI-5112 does not yet support continuous acquisition. The on-board 16MB or 32MB buffer stores the data until the entire acquisition is completed. Once the acquisition complete, all of the data is transferred from the on-board buffer to the hard drive. After that happens, the NI 5112 is ready for another acquisition.
Best Regards,
Jace Curtis
NI Applications Engineering -
Why can I send a text message from my iPad mini from my contacts?
I try to send a text message from my contact list on my ipad mini ,
the contact name comes up in pink.....Can you tell me why?Hi,
Because you are choosing an Contact ID (iPhone Number or Apple ID) that is either not registered or currently unavailable.
A iPhone away from WiFi connection may also be out of range of it's Cell/mobile Service. (Or Switched Off or in Airplane Mode).
An iPad may not be on a Wifi Network at present. (or run out of Power)
You may know a Buddy's email and it may also be an Apple ID but that does not mens that they have "registered" it for iMessages.
10:37 PM Monday; December 10, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
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Problem sending a SMS message from mobile phone t809
Hello!
I am trying to send a SMS message from my cell phone. This is Samsung t809 phone with CLDC 1.1 and MIDP 2.0
The code that I am using is next:
MessageConnection smsconn = null;
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smsconn.send( txtMsg );
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System.out.println( e.getMessage() );
form_main.append( "\nError occured!" );
if( smsconn != null )
try
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catch( IOException e )
e.printStackTrace();
System.out.println( e.getMessage() );
Seems like on cell phone I have an exception because I can see the line "Error occured!"
I have no idea why... :(
Will appreciate any help and comments.
Thank you!
P.S. Oh yes... the phone 18885552233 is not real, I just used my friend cell phone to test. Does not work... :(
Message was edited by:
viva_unixhello,
when you use smsconn = ( MessageConnection )Connector.open( "sms://:50000" ); it means that you are trying to connect to a sms server. So if you don't have a sms server on your computer, an exception is thrown !
if you just wanna test sms sending, put the phone number in the string like this
smsconn = ( MessageConnection )Connector.open( "sms://123456789" );<b>reference</b>:
http://developers.sun.com/techtopics/mobility/midp/articles/wma/index.html
hope it will help you
peace
supareno -
HT1688 I cannot send pictures or videos from my I phone 3gs. I use to be able to by not any longer.
I am unable to send video and pictures from my I phone. I was able to but now I cannot. Can someone please help.
I'm not sure exactly what you mean, but I'll give a few examples of what I think you might be looking for.
I am running iOS 5 on my iPad and Pages '08 on my iMac.
1. I created a Pages file on my iPad and emailed it to me by selecting the wrench --> share and print -->email document -->chose Pages as the format. I collected the file from my email and attempted to open it in Pages '08. The message I received was that I needed a newer version of Pages. True enough, but I'm sure that iWork '12 will come out this summer so I'll hold off on that purchase. What I did to solve this problem was to send the file in Word format instead. When I opened it with Pages '08, I had to tweak the format a bit, but it worked. Perhaps your trouble is that you need to upgrade. You could also send the file in PDF format.
2. I created a file in Pages '08 and sent it as an attatchment by email to my iPad. I collected the file from my email on the iPad, then clicked on the attatchment. It opened in Pages for iPad with no problem. If this is the senario you are having trouble with, then I suggest you first send a test file, and if that doesn't work, make sure all your files are backed up then delete the app and reinstall it. WARNING!!! when you delete the app, all files will be deleted as well. Make sure you have current and accurate backups that you can access before taking this step. Files saved in iTunes may not be accessable other than to the iPad. Make sure you can open the files on your computer BEFORE taking this action. -
Send String failed using socket
Hi all,
I have just finished a program which send a string client to the host server using simple socket. The program is developed using JBuilder9 and run well in winxp pro. When the same program run in linux (red hat), the host server can only see the connection and close. The string never receive in the server side. The problem is worked out like the following
-create socket
-create output stream using "PrintWriter"
-send string
-close socket
Pls. comment on what I should do to debug this problem.
Thanks,
PeterHi all,
Thanks for your assistance. I have log down the following from linux using "tcpdump"
13:16:48.218624 128.128.2.161.33083 > pmon-srv0.999: P 1:42(41) ack 1 win 5840 <nop,nop,timestamp 158365 0> (DF)
13:16:48.219105 128.128.2.161.33083 > pmon-srv0.999: F 42:42(0) ack 1 win 5840 <nop,nop,timestamp 158365 0> (DF)
13:16:48.219742 pmon-srv0.999 > 128.128.2.161.33083: . ack 43 win 64199 <nop,nop,timestamp 2471694 158365> (DF)
13:16:48.219876 pmon-srv0.999 > 128.128.2.161.33083: F 1:1(0) ack 43 win 64199 <nop,nop,timestamp 2471694 158365> (DF)
13:16:48.219894 128.128.2.161.33083 > pmon-srv0.999: . ack 2 win 5840 <nop,nop,timestamp 158365 2471694> (DF)
13:17:59.746088 128.128.2.211.1633 > pmon-srv0.999: P 1:43(42) ack 1 win 17520 (DF)
13:17:59.756047 128.128.2.211.1633 > pmon-srv0.999: F 43:43(0) ack 1 win 17520 (DF)
13:17:59.756493 pmon-srv0.999 > 128.128.2.211.1633: . ack 44 win 64198 (DF)
13:17:59.756989 pmon-srv0.999 > 128.128.2.211.1633: F 1:1(0) ack 44 win 64198 (DF)
13:17:59.757103 128.128.2.211.1633 > pmon-srv0.999: . ack 2 win 17520 (DF)
128.128.2.211 is the client in winxp pro
128.128.2.161 is the client in linux
pmon-srv is the server
In the first line of each section, it shows that number of bytes have push to the server. I don't know what should I do next to solve the problem.
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public class pconnect {
String ip_addr;
String fromServer, toServer;
int i,port;
Socket pmSocket;
BufferedReader pm_in;
PrintWriter pm_out;
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ip_addr=ip;
port=portno;
try {
pmSocket = new Socket(ip_addr, port);
pm_out = new PrintWriter( pmSocket.getOutputStream(), true );
pm_in = new BufferedReader( new InputStreamReader( pmSocket.getInputStream() ) );
} catch (Exception err) {
System.err.println(err);
System.exit(0);
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try {
Thread.sleep(5000);
} catch (InterruptedException e){}
if (pmSocket.isConnected()) {
try {
System.out.println("Stream Status: " + pmSocket.isOutputShutdown());
System.out.println("Bound Status: " + pmSocket.isBound());
pm_out.println(msg);
if (pm_out.checkError()) {
System.out.println("Socket error");
}catch (Exception e){System.out.println("Exception: " + e);}
try {
pmSocket.close();
} catch (Exception err) {
System.err.println("Closed Error: "+err);
public static void main(String[] args) {
System.out.println(args.length);
System.out.println(args[0]);
pconnect pconnect1 = new pconnect(args[0],Integer.parseInt(args[1]));
pconnect1.sendMsg("SET00000000N|ALARM:MBX TEST|c29K1920755D");
Thanks,
Peter -
Sending down Linux commands from database
Hello
Im working with Oracle 10.2.0.4.3 on Linux SuSE FUSE Version 2.3.0-RC0-SL0/SLES-9.
Im currently doing an extract of BLOB files down to a directory on the server.
When I do the extract the Oracle user becomes the owner of the files and my own user doesn't have the access (neither read or write) to the files.
I cannot receive Oracle access due a security issue so Im wondering if its possible to send down a command from the database that does a
$chmod a+rw my_directory/*.* ?
Iv looked into the some forums and I didnt find anything in particulate that would help me, so Im wondering if any of you know if this is possible ?
BR / SAHello
Thank you for your advice but the question was to send down Linux commands from the DB, not do anything in the Linux enviroment.
Here is a good place to start that I found on the net.
public class JShellCommand {
public static int execute(String cmd) {
try
String[] shellCmd = { "/bin/sh", "-c", cmd };
Process process = Runtime.getRuntime().exec(shellCmd);
int exitVal = process.waitFor();
return (exitVal);
catch (Exception e)
return 1;
load it into db with loadjava and wrap it with:
CREATE OR REPLACE
FUNCTION Shell_Command(
p_CMD IN VARCHAR2
RETURN NUMBER
AS
LANGUAGE JAVA
NAME 'JShellCommand.execute(java.lang.String) return int';
For OS command you can use:
public class JCommand {
public static int execute(String cmd) {
try
Process process = Runtime.getRuntime().exec(cmd);
int exitVal = process.waitFor();
return (exitVal);
catch (Exception e)
return 1;
and
CREATE OR REPLACE
FUNCTION OS_Command(
p_Cmd IN VARCHAR2
RETURN NUMBER
AS LANGUAGE JAVA
NAME 'JCommand.execute(java.lang.String) return int';
/ -
Repetative trigger from PXI-6733 to PXI-6220
I am running a PXI-6733 in continuous mode and want to send a trigger pulse from the 6733 to a PXI-6220 at the start of each cycle. I will also want to do this in finite sample mode. I have used a DAQmx Connect Terminals VI to connect the trigger channels. But I cannot find how to set the 6733 StartTrigger as an output or how to synchronize it with the analog output. Any suggestions would be welcome.
BobSince your AWG needs to send the 6220 the trigger, the M Series (6220) correlated DIO feature doesn't help. Luckily, the 6733 also has the feature. I've attached a vi that shows how to set up the 6733 to output a companion digital waveform to the analog waveform. The first point in the digital waveform is a 1, the rest is 0. You will have to connect a physical wire from the digital line used to an input (PFI) of the 6220.
If you can run the 6220 in a 'batch' mode (a series of finite tasks), you can use this digital line as a Start Trigger for your 6220. If your passes happen too quickly, you might need to run the 6220 continuously. Now, you might use a counter on the 6220 to generated the sample clock for the analog input task. The digital line from the 6733 would serve as the counter tasks's Start Trigger. The counter task would produce a series of pulses each time it got this trigger. This is getting a little complicated.
Attachments:
6733 Correlated AO and DO.vi 66 KB
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