Pxi-8176 controller to read data from an instrument controlled by another controller

can i use pxi-8176 controller to read instrument data on the gpib bus from an instrument controlled by another pc gpib controller?

Thanks.
I understand what you're saying, but I'm also trying to understand why the following is not possible or is not more readily available:... Just as NI IO Trace (NI Spy) listens/eavesdrops to the GPIB real time, one would think that Labview would be able to do it also. One would think that just as NI IO Trace (NI Spy) publishes to a window/file/memory it shouldn't be impossible to publish to a string so that it can be processed real-time by some VI algorithm. If I think about NI IO Trace as a VI, I would think that it is already in a string format before it is published to the NI IO Trace window... why isn't that string available to Labview VIs block diagram?

Similar Messages

Best way to control and read data from multiple instruments?

Hello,
I'm building an application to test power supplies involving multiple pieces of equipment over a couple of different comm busses. The application will also send control instructions to some of the instruments, and read data from some of the instruments. The reading and control profiles will not run on the same schedule (variable length control steps, configurable read interval).
I was thinking of using a queued statemachine (producer/consumer) for the control profile and another to read the data, but I got concerned that there would be collisions between sending control commands and read commands to the same machine. Is there a suggested design pattern for implementing something like this?
Timing of the commands isn't critical down to the milisecond, but I need to collect reasonably accurate timestamps when the data is read. The same is true for the control commands.
Here are the instruments I'm going to use, if the are control, read, or both, and the communication method
Instrument Funtions Comm Method
Power Supply Read data Communicates to PMBus Adapter
PMBus to USB Adapter Read data USB (Non-Visa)
Switch control relays USB (VISA)
Power Dist. Unit read data/control outlets SNMP (Ethernet)
Electronic Load read data/control load GPIB (VISA)
Thermal Chamber read data/control temp Ethernet (VISA)
Thanks,
Simon

Hello, there is a template in LV called "Continuous measurement and Logging".
It can give you some idea how to properly decouple the "GUI Event handler" top loop (where your Event structure is) from the DAQ and other loops.
You do not need to totally replicate the above example, but you can find there nice tricks which can help you at certain points.
The second loop from the top is the "UI message loop". It handles the commands coming from the top loop, and regarding to the local state machine and other possible conditions and states, it can command the other loops below.
During normal run, the different instrument loops just do the data reading, but if you send a control command from the top loop to a certain instrument loop (use a separate Queue for every instrument loops), that loop will Dequeue the control command, execute it, and goes back to data reading mode (in data reading mode the loop Dequeu itself with a "data read" command automatically). In this way the control and data read modes happen in serial not in parallel which you want to avoid (but I think some instrument drivers can even handle parallel access, it will not happen in really parallel...).
In every instrument loop when you read a value, attach a TimeStamp to it, and send this timestamp/value couple to the DataLogging loop via a Queue. You can use a cluster including 3 items: Source(instrument)/timestamp/value. All the instrument loops can use the same "Data logging" Queue. In the Datalogging while loop, after Dequeue-ing, you can Unbundle the cluster and save the timestamp and data-value into the required channel (different channel for every instrument) of a TDMS file.
(Important: NEVER use 2 Event structures in the same top level "main" VI!)

Trouble reading data from GPIB instrument using VISA

Hello, I am having trouble with reading data from a GPIB instrument in LabVIEW. It appears that the data that is returned from VISA read is incorrect. (I used NI Spy to verify what it should be and what I get, they are different) The odd thing is that when I use the VISA interactive control utility to get the data, it works perfectly. Is there some sort of VISA property that I need to set to get it to work right? Writing to the device seems to work correctly. If you need more info, please e-mail me @ [email protected] Thanks in advance!

What exactly do you mean when you say the data you are getting is incorrect? I'm guessing that you are dealing with some sort of data type issue. The VISA Read VI will return a set number of bytes in string (ASCII) format. If you are expecting a different data type, you will have to do some conversion by either using a type cast or string conversion function. The type cast function can be found in the Advanced-> Data Manipulation palette, while the string conversion functions can be found in the String palette.

Read data from a .csv located on another server

Hi!:
I've an application that currently reads some data from a .CSV file that I upload everyday using a file browser item plus a custom procedure to parse it. I was wondering if it'd be possible to automatically read the information from a remote file located in a web server. I've been looking for ways to do this, but couldn't find anything. Do you have any ideas?.
thanks for your help!

I'm pretty sure the answer is no, if it's not on the database server.
However (this isn't my area of expertise really) if your server admins have the ability to somehow mount a network drive (or volume? sorry i don't know the terminology or details) to the database server and then, as far as the database server is concerned, the file looks/walks/talks as if it's local on the same box and then you can reference it via UTL_FILE, an external table, etc.

Module pool transfer of data from one table control to another

Hi all,
I have been assigned to module pool object wherein i have to display table control on screen and that table control contains only 10 rows on screen for display. Now my internal table it_out has 15 rows
Describe table it_out
line v_l.     " v_l = 15.
There is a pushbutton below table control and when i select multiple rows and click on that pushbutton it will navigate me to the next screen containing another table control on which i need to display those selected records.
Now the problem is that when i select first record and move cursor down to select last record then i am seeing only last record on next screen table control. why is it happening? please provide me with solution. For rest of cases it is working fine for example if i select first record and second record then i am seeing both these selected records on next screen table control . Only the problem arises when i tried to select first and lets say last record when scrolling down on table control.
I think the problem is with scrolling but when i loop on next screen with moved records i am seeing that 2 records are their but it is transferring only one record to next screen not the last one.
Your response is highly appreciated.
Thanks
Parag

Hi Parag,
Screen 8002 (with table control) --> select records --> press a button --> move to screen 8003 --> display selected records in screen 8002.
First problem that if you select first record in table control and scroll to end to select the last record, the first record in deselected.
Next problem, that if you select say 3 records in table control you want the to be displayed in another table control, the use this code.
Also take another internal table and work area same as the initial internal table and work area used in screen 8002.
On screen 8002, take a button with function code 'PROCESS', on which user clicks the screen 8003 should display selected records.
Now, use this code, its working:-
Take the names of the input/output fields as work_area-field_name and select column in table control as work_area-flag.
Also take a flag field of size 1 datatype character as the last field in the internal table and work area while declaration.
You must have passed a code in PBO of the screen for reading internal table into the table control.
So it reads the internal table into the table control whenever you perform any action on use command.
All you need to do is to write a code to modify the internal table form the table control while performing any user action.
Remember to change the LINE SEL option in attributes of table control as MULTIPLE.
At Screen Logic:-
PROCESS BEFORE OUTPUT.
MODULE status_8002. "for pf-status
LOOP WITH CONTROL po_tab. "po_tab is name of table control
    MODULE pass_data. "to pass data into table control from internal table
ENDLOOP.
PROCESS AFTER INPUT.
MODULE user_command_8002. "to handle other user commands (back and exit)
LOOP WITH CONTROL po_tab. "po_tab is name of table control
    MODULE modify_data. "to modify data from table control into internal table
    MODULE process_data. "to display selected records on another screen
ENDLOOP.
In PBO,
*&      Module STATUS_8002 OUTPUT
MODULE status_8002 OUTPUT.
SET pf-status 'ZAB_PFSTA'. " pf-status
DATA : line_count TYPE i.
DESCIRBE TABLE it_ekpo
LINES line_count.
po_tab-lines = line_count + 10.
" to make table control scrollable
ENDMODULE.                 " STATUS_8002 OUTPUT
*&      Module PASS_DATA OUTPUT
MODULE pass_data OUTPUT.
READ TABLE it_ekpo into wa_ekpo INDEX po_tab-current_line.
ENDMODULE.                 " PASS_DATA OUTPUT
"it_ekpo is internal table and wa_ekpo is the work area
In PAI,
*&      Module MODIFY_DATA INPUT
MODULE MODIFY_DATA INPUT.
MODIFY IT_EKPO INDEX PO_TAB-CURRENT_LINE FROM WA_EKPO.
"modify records from table control into the internal table
ENDMODULE.                 " MODIFY_DATA INPUT
*&      Module PROCESS_DATA INPUT
MODULE PROCESS_DATA INPUT.
CASE sy-ucomm.
    WHEN 'PROCESS'.
      IF wa_ekpo-flag = 'X'.
        wa_ekpo1 = wa_ekpo.
        APPEND wa_ekpo1 TO it_ekpo1. "if record selected move to another internal table
      ENDIF.
ENDCASE.
"modify records from table control into the internal table
ENDMODULE.                 " PROCESS_DATA INPUT
Now if you select some records in this table control the values will retain in internal table.
Screen 8003 with selected records to be displayed in another table control.
At Screen Logic:-
PROCESS BEFORE OUTPUT.
MODULE status_8003. "for pf-status
LOOP WITH CONTROL po_tb. "po_tb is name of table control
    MODULE pass_data1. "to pass data into table control from internal table
ENDLOOP.
PROCESS AFTER INPUT.
MODULE user_command_8003. "to handle other user commands (back and exit)
LOOP WITH CONTROL po_tb. "po_tb is name of table control
    MODULE modify_data1. "to modify data from table control into internal table
ENDLOOP.
In PBO,
*&      Module STATUS_8003 OUTPUT
MODULE status_8003 OUTPUT.
SET pf-status 'ZAB_PFSTA'. " pf-status
DATA : line_count1 TYPE i.
DESCIRBE TABLE it_ekpo1
LINES line_count1.
po_tb-lines = line_count1 + 10.
" to make table control scrollable
ENDMODULE.                 " STATUS_8003 OUTPUT
*&      Module PASS_DATA1 OUTPUT
MODULE pass_data1 OUTPUT.
READ TABLE it_ekpo1 into wa_ekpo1 INDEX po_tb-current_line.
ENDMODULE.                 " PASS_DATA1 OUTPUT
"it_ekpo is internal table and wa_ekpo is the work area
In PAI,
*&      Module MODIFY_DATA1 INPUT
MODULE MODIFY_DATA1 INPUT.
MODIFY IT_EKPO1 INDEX PO_TB-CURRENT_LINE FROM WA_EKPO1.
"modify records from table control into the internal table
ENDMODULE.                 " MODIFY_DATA1 INPUT
Hope this solves your problem.
Thanks & Regards,
Tarun Gambhir

How do I read data from a DMM or DC Power Supply at a specified rate?

I have a PXI system with 4071 DMMs and 4110 DC Power Supplies. I want to be able to measure the power consumption of my DUT as it performs various operations. This is what my process flow looks like:
1. Configure DMM and Power Supply
2. Wait for DUT to go into a certain mode
3. Start Acquiring data from DMM and PS.
4. Wait for DUT to get out of this mode
5. Stop Acquiring data from DMM and PS.
Since the duration of step #4 is uncertain, I cannot tell the units to collect a predetermined number of samples and give it back to me. Instead I have to take readings as long as it's required.
I'm attaching screenshots of my setup and read process. The reading is done inside a timed loop which is running at 1kHz.
The problem is that using niDMM Read Multi-Point or niDCPower Measure Multiple takes 5-9ms before I get a reading, so I'm not really getting 1ms resolution in my data. I'm sure there are other folks who have had the need to read data from these devices with better time-resolution, so if anyone can point me in the correct direction, it would be great. I'm pretty sure I'm not doing the correct thing here.
Attachments:
1-Setup.PNG ‏12 KB
2-Read.PNG ‏9 KB

What is really confusing to me is why you are even using the multi-point function when you set the sample count to 1. If you want multiple points, request multiple samples and let the DMM acquire them at a rate you specify. If you want a single sample, use the normal Read. You also need to pay attention to how fast the DMM can acquire. If you want the fastest sample rates, you might be a lot better off with a DAQ board.

Reading Data from SCXI 1600

Hi Experts,
I am new to this SCXI Interfacing. Kindly help me in the context
I am developing an application which is going to be use SCXI 1125 module and SCXI 1600 controller.In the application I want to allow the user to configure various Task in the front panel.
What are the controls needed in the front panel to allow the user to configure Task
How to read the data from SCXI 1600,
How to differentiate eight channel data coming from SCXI 1125 thro SCXI 1600
Thanks in advance
Solved!
Go to Solution.

True, you cannot simulate the SCXI-1600. This means you will not be able to run your code without the hardware. For simulation purposes you can, however, use another device that would function in a similar manner to the SCXI-1600 in terms of triggering, resolution, and sampling rate.
As for the programming, you would use DAQmx as I had mentioned. There are no examples that are specific to the SCXI-1600, but you don't really need them. The SCXI-1600 is fundamentally a data acquisition module that happens to be in a SCXI form factor with a USB connection. As far as your software is concerned you will use DAQmx to read data from it. So, take a look at the DAQmx examples that gather data from data acquisition devices.
Your task will define how many channels you will be reading. Since you are reading a mixture of measurements (temperature, pressure, and possibly just plain voltages) you will need to decide whether to create separate tasks for each of these measurements that are configured to be specific to that measurement type, or to create one task that simply reads all unscaled channel values (i.e. raw voltages) and then you scale the values in your code. If you open the Example Finder and navigate the tree to Hardware Input and Output -> DAQmx -> Analog Measurements you will see categories for the different measurement types. Many of them have graphs.
If you have not already done so, you may want to start here: http://zone.ni.com/devzone/cda/tut/p/id/3116

View Object to read data from a java file

Hi,
I am using JDeveloper 11.1.1.4 and ADF-BC in my application.
For one of my view objects , I want the data to be read from a java file which exposes some method to return a collection.
I cannot use a static view object in this case.
Please suggest the best way to implement this requirement.Basically build a view object that should read data from a java file.
Thanks,
Praveen

Depending on your use case you can either use a programmatic VO or directly expose the JV class as a data control.
http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_36/jdtut_11r2_36.html

Read data from SAP R/3 Class-System

Hello,
first of all sorry when I posted this into the wrong subforum, but I wasn't sure about that. My Question is how to read data from the Classystem I have specified in my ABAP report.
The goal is to read data from my individual class-system as well as data from MM and write them to a table that is to be read by another report. But right now I can't find information about the class system and abap. Maybe you know some tutorials or blogs about right that topic you can suggest?

What class system have you specified in your report?
Normally a class can be used by declaring a variable of type of the class in question, if this class can be instantiated this is. If your class can't be instantiated, but it has only class methods, you can call this method directly.
But there is a lot more to this ABAP Object Oriented Programming, than just this short explanation. Search on SDN for some ABAP OO Tutorials.
some links:
http://help.sap.com/saphelp_nw2004s/helpdata/en/c3/225b5654f411d194a60000e8353423/frameset.htm
http://www.sapgenie.com/abap/OO/
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b6cae890-0201-0010-ef8b-f970a9c41d47
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/1591ec90-0201-0010-3ba8-cdcd500b17cf
Transacation ABAPDOCU.

Can not read data from URL!

Hello,
I want to read data from URL (http://84.100.130.82:8000/;stream.nsv). But can not do it. Because when try to call function openDataInputStream() shows this error: java.io.IOException: response does not start with HTTP it starts with: ICY. How I can fix this bug?
HttpConnection c = null;
InputStream is = null;
OutputStream os = null;
StringBuffer b = new StringBuffer();
String response,
responseLitle;
c = (HttpConnection)Connector.open(“http://84.100.130.82:8000/;stream.nsv”);
os = c.openOutputStream();
os.flush();
is = c.openDataInputStream(); // ERROR CODE HERE
int ch;
// receive output
while ((ch = is.read()) != -1)
b.append((char) ch);
response = b.toString();Regards, Ramunas

Hi, I�m trying to do the same as above, get MP3 from a Shoutcast server.
I got the same fault ("response does not start with HTTP it starts with: ICY") when I tried to open an HttpConnection as bellow:
============================================
HttpConnection conn = (HttpConnection) Connector.open("http://64.236.34.196/stream/1074");
Then I tried to open a socket connection as bellow:
======================================
SocketConnection conn = (SocketConnection) Connector.open("socket://64.236.34.196:80");
String get = "GET /stream/1074 HTTP/1.1";
DataOutputStream os = conn.openDataOutputStream();
os.writeUTF(get);
InputStream is = conn.openInputStream();
But then I got the following error:
=========================
java.lang.SecurityException: Target port denied to untrusted applications
Could someone help me to find out what is going on?
Thanks a lot!

Read data from excel sheet and then perform the required operations.

Hi all
I need to write a procedure which can read data from excel sheet.I have excel sheet in which i have to options one is modification and other is addition.so if it reads modification then i need to read the concerned table name then check its availability in pl-sql datbase.If table exists then reading the realated column in that row to fire the querry. The excel sheet is saved in local disk c.
can anybody help me with this.How i need to start specialy to read the data from excel sheet saved in local disk c.
Edited by: user13334062 on Jun 30, 2010 3:45 AM

Hi
If you can convert the excel to a csv format, then it can be simply query from DB Creating Oracle External Tables. Best part is that you may still change the CSV using EXCEL.
Following action Points can be adopt;
*1. Convert Excel File to a csv. File Save as CSV*
*2. Create Oracle Directory* ( This has to be the location of your excel file )
SQL> Create directory mydir as 'C:\testdb'; --- "testdb" is the location folder in win for your excel sheet.
*3. Create the External Table*
SQL> create table my_ext_tab (
Field1 Datatype,
Field2 Datatype,
Field3 Datatype,
Field4 Datatype,
Field5 Datatype
Organization external
(type oracle_loader default directory mydir
access parameters (records delimited by newline fields terminated by ',')
location ('my_ext_tab.csv'))
reject limit 100;
*4. Now you can query the table "my_ext_tab"*
Select * from "my_ext_tab";
Please avoid the reformat the data column inside the spreadsheet (CSV).

Without loops how can i read data from associative Array??

Hi all,
I am facing scenario like...
i need to read data from associative array without using loops is it possible,
CREATE OR REPLACE PACKAGE BODY test_pkg IS
    TYPE t1 IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
   -- in array we can expect more than one row or sometimes no data also.
FUNCTION test1(vt1 T1 DEFAULT CAST(NULL AS t1)) RETURN NUMBER IS
BEGIN
    -- basically in array we'll get data of column2
    -- this loop should satisfies table1.colum2 = nvl(NULL, table2.colum2 )if array is null.
    -- if array is not null then only compare with array values
    FOR i IN (SELECT t1.colum1,t1.column2
                     FROM table1 t1, table1 t2
                          WHERE t1.colum1 = t2.column1
                            AND t1.colum2 = nvl(vt1, t2.colum2)
      LOOP
        generateTEXT(i.colum1, i.colum2);
     END LOOP;
END test1;
END test_pkg;
in table1 we have date like...
colum1          column2
Jan                  1
Feb                  2
Mar                  3
if i call select test_pkg.test1(1) from dual then output should
be Jan..
and
select test_pkg.test1(null) from dual then it should display all elements from table1.
Jan                  1
Feb                  2
Mar                  3,
Thanks for your quick replay..

i need to read data from associative array without using loops is it possible,
No - you would need to create a SQL type and then use the TABLE operator to unnest the collection.
create or replace TYPE my_nums IS TABLE OF INTEGER;
DECLARE
-- TYPE my_nums IS TABLE OF PLS_INTEGER INDEX BY PLS_INTEGER;
v_nums my_nums := my_nums(1, 2, 3);
v_total number;
BEGIN
select sum(column_value) into v_total from table(v_nums);
DBMS_OUTPUT.PUT_LINE
    ('Sum of the numbers is ' || TO_CHAR(v_total));
END;
Sum of the numbers is 6

Read data from a Stored Procedure in Android

I have a Stored Procedure say CustOrdersDetail. I have created a MBO for it in the workspace and deployed it on SAP Mobile Server. I am unable to read data from the stored procedure in code of the Android Application. If I pass a default load argument, then I am able to read data using findAll method. How to get the data from the stored procedure by passing it an argument in the Android Code ?
Message was edited by: Abhijit Kadam

Currently I am trying to call the stored procedure and retrieve the results. The stored procedure accepts 'orderId' as an argument and fetches the Product and Order Details.

TcpListener not working on Azure: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host

Hi Everybody,
i'm playing a little bit with Windows Azure and I'm blocked with a really simple issue (or maybe not).
I've created a Cloud Service containing one simple Worker Role. I've configured an EndPoint in the WorkerRole configuration, which allows Input connections via tcp on port 10100.
Here the ServiceDefinition.csdef file content:
<?xml version="1.0" encoding="utf-8"?>
<ServiceDefinition name="EmacCloudService" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition" schemaVersion="2014-01.2.3">
<WorkerRole name="TcpListenerWorkerRole" vmsize="Small">
<Imports>
<Import moduleName="Diagnostics" />
<Import moduleName="RemoteAccess" />
<Import moduleName="RemoteForwarder" />
</Imports>
<Endpoints>
<InputEndpoint name="Endpoint1" protocol="tcp" port="10100" />
</Endpoints>
</WorkerRole>
</ServiceDefinition>
This WorkerRole is just creating a TcpListener object listening to the configured port (using the RoleEnvironment instance) and waits for an incoming connection. It receives a message and returns a hardcoded message (see code snippet below).
namespace TcpListenerWorkerRole
using System;
using System.Net;
using Microsoft.WindowsAzure.ServiceRuntime;
using System.Net.Sockets;
using System.Text;
using Roche.Emac.Infrastructure;
using System.IO;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.Diagnostics;
using System.Linq;
public class WorkerRole : RoleEntryPoint
public override void Run()
// This is a sample worker implementation. Replace with your logic.
LoggingProvider.Logger.Info("TcpListenerWorkerRole entry point called");
TcpListener listener = null;
try
listener = new TcpListener(RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint);
listener.ExclusiveAddressUse = false;
listener.Start();
LoggingProvider.Logger.Info(string.Format("TcpListener started at '{0}:{1}'", RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint.Address, RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint1"].IPEndpoint.Port));
catch (SocketException ex)
LoggingProvider.Logger.Exception("Unexpected exception while creating the TcpListener", ex);
return;
while (true)
Task.Run(async () =>
TcpClient client = await listener.AcceptTcpClientAsync();
LoggingProvider.Logger.Info(string.Format("Client connected. Address='{0}'", client.Client.RemoteEndPoint.ToString()));
NetworkStream networkStream = client.GetStream();
StreamReader reader = new StreamReader(networkStream);
StreamWriter writer = new StreamWriter(networkStream);
writer.AutoFlush = true;
string input = string.Empty;
while (true)
try
char[] receivedChars = new char[client.ReceiveBufferSize];
LoggingProvider.Logger.Info("Buffer size: " + client.ReceiveBufferSize);
int readedChars = reader.Read(receivedChars, 0, client.ReceiveBufferSize);
char[] validChars = new char[readedChars];
Array.ConstrainedCopy(receivedChars, 0, validChars, 0, readedChars);
input = new string(validChars);
LoggingProvider.Logger.Info("This is what the host sent to you: " + input+". Readed chars=" + readedChars);
try
string orderResultFormat = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\xB")) + @"MSH|^~\&|Instrument|Laboratory|LIS|LIS Facility|20120427123212+0100||ORL^O34^ORL_O34| 11|P|2.5.1||||||UNICODE UTF-8|||LAB-28^IHE" + Environment.NewLine + "MSA|AA|10" + Environment.NewLine + @"PID|||patientId||""""||19700101|M" + Environment.NewLine + "SPM|1|sampleId&ROCHE||ORH^^HL70487|||||||P^^HL70369" + Environment.NewLine + "SAC|||sampleId" + Environment.NewLine + "ORC|OK|orderId|||SC||||20120427123212" + Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\x1c\x0d"));
writer.Write(orderResultFormat);
catch (Exception e)
LoggingProvider.Logger.Exception("Unexpected exception while writting the response", e);
client.Close();
break;
catch (Exception ex)
LoggingProvider.Logger.Exception("Unexpected exception while Reading the request", ex);
client.Close();
break;
}).Wait();
public override bool OnStart()
// Set the maximum number of concurrent connections
ServicePointManager.DefaultConnectionLimit = 12;
DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString");
RoleEnvironment.Changing += RoleEnvironment_Changing;
return base.OnStart();
private void RoleEnvironment_Changing(object sender, RoleEnvironmentChangingEventArgs e)
// If a configuration setting is changing
LoggingProvider.Logger.Info("RoleEnvironment is changing....");
if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))
// Set e.Cancel to true to restart this role instance
e.Cancel = true;
As you can see, nothing special is being done. I've used the RoleEnvironment.CurrentRoleInstance.InstanceEndpoints to retrieve the current IPEndpoint.
Running the Cloud Service in the Windows Azure Compute Emulator everything works fine, but when I deploy it in Azure, then I receive the following Exception:
2014-08-06 14:55:23,816 [Role Start Thread] INFO EMAC Log - TcpListenerWorkerRole entry point called
2014-08-06 14:55:24,145 [Role Start Thread] INFO EMAC Log - TcpListener started at '100.74.10.55:10100'
2014-08-06 15:06:19,375 [9] INFO EMAC Log - Client connected. Address='196.3.50.254:51934'
2014-08-06 15:06:19,375 [9] INFO EMAC Log - Buffer size: 65536
2014-08-06 15:06:45,491 [9] FATAL EMAC Log - Unexpected exception while Reading the request
System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.IO.StreamReader.ReadBuffer(Char[] userBuffer, Int32 userOffset, Int32 desiredChars, Boolean& readToUserBuffer)
at System.IO.StreamReader.Read(Char[] buffer, Int32 index, Int32 count)
at TcpListenerWorkerRole.WorkerRole.<>c__DisplayClass0.<<Run>b__2>d__0.MoveNext() in C:\Work\Own projects\EMAC\AzureCloudEmac\TcpListenerWorkerRole\WorkerRole.cs:line 60
I've already tried to configure an internal port in the ServiceDefinition.csdef file, but I get the same exception there.
As you can see, the client can connect to the service (the log shows the message: Client connected with the address) but when it tries to read the bytes from the stream, it throws the exception.
For me it seems like Azure is preventing the retrieval of the message. I've tried to disable the Firewall in the VM in Azure and the same continues happening.
I'm using Windows Azure SDK 2.3
Any help will be very very welcome!
Thanks in advance!
Javier
En caso de que la respuesta te sirva, porfavor, márcala como válida
Muchas gracias y suerte!
Javier Jiménez Roda
Blog: http://jimenezroda.wordpress.com

hi Javier,
I changed your code like this:
private AutoResetEvent connectionWaitHandle = new AutoResetEvent(false);
public override void Run()
TcpListener listener = null;
try
listener = new TcpListener(
RoleEnvironment.CurrentRoleInstance.InstanceEndpoints["Endpoint"].IPEndpoint);
listener.ExclusiveAddressUse = false;
listener.Start();
catch (SocketException se)
return;
while (true)
IAsyncResult result = listener.BeginAcceptTcpClient(HandleAsyncConnection, listener);
connectionWaitHandle.WaitOne();
The HandleAsync method is your "While (true)" code:
private void HandleAsyncConnection(IAsyncResult result)
TcpListener listener = (TcpListener)result.AsyncState;
TcpClient client = listener.EndAcceptTcpClient(result);
connectionWaitHandle.Set();
NetworkStream netStream = client.GetStream();
StreamReader reader = new StreamReader(netStream);
StreamWriter writer = new StreamWriter(netStream);
writer.AutoFlush = true;
string input = string.Empty;
try
char[] receivedChars = new char[client.ReceiveBufferSize];
// LoggingProvider.Logger.Info("Buffer size: " + client.ReceiveBufferSize);
int readedChars = reader.Read(receivedChars, 0, client.ReceiveBufferSize);
char[] validChars = new char[readedChars];
Array.ConstrainedCopy(receivedChars, 0, validChars, 0, readedChars);
input = new string(validChars);
// LoggingProvider.Logger.Info("This is what the host sent to you: " + input + ". Readed chars=" + readedChars);
try
string orderResultFormat = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\xB")) + @"MSH|^~\&|Instrument|Laboratory|LIS|LIS Facility|20120427123212+0100||ORL^O34^ORL_O34| 11|P|2.5.1||||||UNICODE UTF-8|||LAB-28^IHE" + Environment.NewLine + "MSA|AA|10" + Environment.NewLine + @"PID|||patientId||""""||19700101|M" + Environment.NewLine + "SPM|1|sampleId&ROCHE||ORH^^HL70487|||||||P^^HL70369" + Environment.NewLine + "SAC|||sampleId" + Environment.NewLine + "ORC|OK|orderId|||SC||||20120427123212" + Encoding.ASCII.GetString(Encoding.ASCII.GetBytes("\x1c\x0d"));
writer.Write(orderResultFormat);
catch (Exception e)
// LoggingProvider.Logger.Exception("Unexpected exception while writting the response", e);
client.Close();
catch (Exception ex)
//LoggingProvider.Logger.Exception("Unexpected exception while Reading the request", ex);
client.Close();
Please try it. For this error message, I suggest you could refer to this thread (http://stackoverflow.com/questions/6173763/using-windows-azure-to-use-as-a-tcp-server
) and this post (http://stackoverflow.com/a/5420788).
Regards,
Will
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