Reading a file via tcp/ip

I have used the open application reference and the open vi reference with the invoke node to remotely activate a vi and this works fine. The vi on the remote comuter creates an output file which i then need to get onto the local computer and I am unsure how to do this, can anyone help, im sure it cant be too hard but i dont really understand the vi client and vi server tcp/ip examples shipped with labview. Im sure it cant be too hard but its just not clicking for me. Can anyone tell me how to do this

Hi Ridge,
I would like to take a stab at answering your questions while avoiding writing a book in the process.
The questions you are asking go down below where you generally work with TCP/IP in the LabVIEW environment. When you are using a PC on a local area network (that may, or may not be connected to the internet) there are a number delivery mechanisms available for moving messages about between machines and the application running on them.
I will try to give you a layman's tour through some of what is going on to move this information around by starting at the bottom and touching on just enough to answer some of your questions.
About 20 years ago the OSI 7-layer model came out describing how people should organize their communications schemes such that many different applications from different vendors would play nice together. This 7-layer model broke the whole process down starting at the TOP which I believe they called the application interface layer down to the bottom which talked about the physical layer, things like wires and transcievers and the like.
Looking back I would have to say that the 7-layer model has worked rather well as far as it has been adhered to. Getting back,
The physical layer also talks about how data will be put on the wire and taken off. Examples of physical layers are things like
Ethernet
Token-Ring
etc.
In the case of ethernet you have any number of computers virtually all sharing the same wire to do the talking. No two can talk at the same time otherwise they would step on each other. This is called a collision. The whole thing works sort of like a party line with a buch of people taking turns having different conversations. Same thing happens on ethernet. Seperate device take turns saying what they have to say and then letting others talk.
To make it fair for all there is a limit of how long your message can be. This keeps one device (person) from tying up the line. If I remeber correctly that was somthing like 4096 bytes or there abouts.
So how does allow larger transferes? That is where the 7-layer model kicks in. In the next higher level, above ethernet and token ring and the like, are the transfer protocols. The transfer protocols are responcible for moving data using the physical layer. Examples of transfer are TCP, UDP, DECnet, LAT, etc.
As in the case of TCP (Transfer Control Protocol ?) they have they trem Protocol buied in them. They all utilize the physical layer to provide what ever service they provide using a set of rules to interact with a conterpart on another part of the physical layer. (boy was that a bad sentence).
Returning to the earlier anology of th ephone conversation. You could have many conversations taking place in different languages as long as the listener and the talker where speaking the same language. same way over ethernet. One talker could speak TCP (english) as long as there was a listner listening for TCP (english) and intermitantly another talker could be talking UDP (spanish) to a different listner listening in UDP (spanish). TCP is just the protocol, or set of rules that are used to interact.
To take the next step up we have to introduce another complication to our party-line analogy. Let say Bill and Bob want to talk english while Sue and Sally want to talk english?
New problem, new rule.
Whenever talking, all conversations must consist of the following format.
Talker,Listner,message.
Eaves droping would sound like,
Bob Bill How are you?
Sue Sally The tangent of the circle would tell us that.
etc
This new rule is analogous to the IP part of TCP/IP. When you are asking for an IP address you are looking for a name that you can use when you are talking. You could use the IP you where born with (static IP), or you could pick up an alias and use it to do some random talking if you want.
WHo decides? The network admisitrator. On my network at home, I set up all of the IP addresses. At work, I have to request one if I need one.
One of the things a network administrator can do is set things up so that there is one machine on the network that gives out aliases to anyone that asks. This is a dynamic IP address. In this case, any to two individuals could talk using aliases, by contacting the the name server and finding out what is the current alias of any other machines.
I have carried on here for quite a while so I wil call it here. I just wanted to explain what is going on below LbVIEW.
Ben
(Legal disclaimer:
I was just talk of the top of my head here. I know TCP/IP are technically two levels tied together, and what ever happened to layers 4-6 anyway?)
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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edit:
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Message was edited by: v604

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I am sure that many of you experienced developers have read requests in the past concerning implmentation of Ward Christenen's XModem protocol over a TCP socket. If not, well... you are about to...
This is a major hack... but it is starting to come together... thanks to Fred Potter for his source code to start this project...
Objective:
Basically, I want to create a console application which accepts an incoming connection and starts the receive mode for a XModem file transfer. I am using CGTerm (for Commodore retrocomputing) but can test with HyperTerminal as well...
The user who connects to the server selects SEND and the FILE to send for a XModem file transfer... and the transfer begins...
The incoming blocks of 128 bytes are written to a file
After the transfer is over the server disconnects the client terminal.
Here is what I have so far:
import java.net.*;
import java.lang.*;
import java.io.*;
// X-Modem Server implementation via TCP/IP socket
public class XServer {
public static FileWriter fw;
public static void main(String[] args) throws IOException {
// define the file
try {
fw = new FileWriter("filename.txt");
} catch (Exception e) {
System.out.println(e);
System.exit(0);
int port = Integer.parseInt(args[0]);
ServerSocket server = new ServerSocket(port);
System.out.println("X-Server v1.0 - waiting for connection");
Socket client = server.accept();
// Handle a connection and exit.
try {
InputStream inputStream = client.getInputStream();
OutputStream outputStream = client.getOutputStream();
new PrintStream(outputStream).println("Go to send file mode!"); // sent to client
System.out.println("Ready to receive file via X-Modem...");
* BEGIN TRANSFER HERE!
// set the debug flag
XModem.debug = true;
* Here we are instantiating a new InputStream that represents the remote
* file that we are receiving. In this single line we are attempting to
* start the flow.
* Behind The Scenes: We're sending a NAK across the serial line repeatedly
* until we finaly start seeing the data flow. If we don't see the data
* flow, then we throw an exception.
System.out.println("Sending NAK to start receive mode...");
InputStream incomingFile;
try {
incomingFile = new XModemRXStream(inputStream, outputStream);
} catch (IOException e) {
System.out.println("ERROR! Unable to start file transfer!");
e.printStackTrace();
return;
System.out.println("Starting file transfer...");
* Here we are reading from the incoming file, byte by byte, and printing out.
* Behind The Scenes: Internally, the read() method is handling the task of
* asking for the next data block from the remote computer, processing it (i.e.
* parsing, running checksums), and then putting it in an internal buffer. Not
* all calls to read() will request a new data block as each block contains at
* least 128 bytes of data. Sometimes you will only hit the buffer.
try {
for (;;) {
int c = incomingFile.read();
if (c==-1)
break; // End of File
// print character / byte
System.out.print(c+",");
// write to file
try {
//System.out.print(".");
fw.write(c);
} catch (Exception e) {
System.out.println(e);
System.exit(0);
} catch (IOException e) {
System.out.println("error while reading the incoming file.");
e.printStackTrace();
return;
// done
System.out.println("File sent.");
new PrintStream(outputStream).println("");
new PrintStream(outputStream).println("transfer successful!");
} finally {
//client.close();
// save the file
try {
fw.close();
System.out.println("file saved.");
} catch (Exception e) {
System.out.println(e);
System.exit(0);
* XModem keeps track of settings that the Receive and Transmit Stream classes will
* reference.
* <p>Copyright: Copyright (c) 2004</p>
* @author Fred Potter
* @version 0.1
class XModem {
public static boolean debug = false;
* XModemRXStream is an easy to use class for receiving files via the XModem protocol.
* @author Fred Potter
* @version 0.1
class XModemRXStream
extends InputStream {
// CONSTANTS
private static final int SOH = 0x01;
private static final int EOT = 0x04;
private static final int ACK = 0x06;
private static final int NAK = 0x15;
private static final int CAN = 0x18;
private static final int CR = 0x0d;
private static final int LF = 0x0a;
private static final int EOF = 0x1a;
// block size - DON'T CHANGE - I toyed with the idea of adding 1K support but the code is NOT there yet.
private static final int bs = 128;
// PRIVATE STUFF
private int ebn; // expected incoming block #
private byte[] data; // our data buffer
private int dataPos; // our position with the data buffer
private InputStream in;
private OutputStream out;
* Creates a new InputStream allowing you to read the incoming file. All of the XModem
* protocol functions are handled transparently.
* As soon as this class is instantiated, it will attempt to iniatate the transfer
* with the remote computer - if unsuccessful, an IOException will be thrown. If it
* is successful, reading may commense.
* NOTE: It is important not to wait too long in between calls to read() - the remote
* computer will resend a data block if too much time has passed or even just give up
* on the transfer altogether.
* @param in InputStream from Serial Line
* @param out OutputStream from Serial Line
public XModemRXStream(InputStream in, OutputStream out) throws
IOException {
this.in = in;
this.out = out;
// Initiate the receive sequence - basically, we send a NAK until the data
// starts flowing.
init:for (int t = 0; t < 10; t++) {
if (XModem.debug) {
System.out.println("Waiting for response [ try #" + t + " ]");
long mark = System.currentTimeMillis();
out.write(NAK);
// Frequently check to see if the data is flowing, give up after a couple seconds.
for (; ; ) {
if (in.available() > 0) {
break init;
try {
Thread.sleep(10);
catch (Exception e) {}
if (System.currentTimeMillis() - mark > 2000) {
break;
// We have either successfully negotiated the transfer, OR, it was
// a failure and timed out. Check in.available() to see if we have incoming
// bytes and that will be our sign.
if (in.available() == 0) {
throw new IOException();
// Initialize some stuff
ebn = 1; // the first block we see should be #1
data = new byte[bs];
dataPos = bs;
* Reads the next block of data from the remote computer. Most of the real XModem protocol
* is encapsulated within this method.
* @throws IOException
private synchronized void getNextBlock() throws IOException {
if (XModem.debug) {
//System.out.println("Getting block #" + ebn);
// Read block into buffer. There is a 1 sec timeout for each character,
// otherwise we NAK and start over.
byte[] buffer;
recv:for (; ; ) {
buffer = new byte[bs + 4];
for (int t = 0; t < 10; t++) {
System.out.println("\nReceiving block [ #" + ebn + " ]");
// Read in block
buffer = new byte[buffer.length];
for (int i = 0; i < buffer.length; i++) {
int b = readTimed(1);
// if EOT - don't worry about the rest of the block.
if ( (i == 0) && (b == EOT)) {
buffer[0] = (byte) (b & 0xff);
break;
// if CAN - the other side has cancelled the transfer
if (b == CAN) {
throw new IOException("cancelled");
if (b < 0) {
if (XModem.debug) {
System.out.println("Time out... NAK'ing");
out.write(NAK);
continue recv;
else {
buffer[i] = (byte) (b & 0xFF);
break;
int type = buffer[0] & 0xff; // either SOH or EOT
if (type == EOT) {
if (XModem.debug) {
System.out.println("EOT!");
out.write(ACK);
break;
int bn = buffer[1] & 0xff; // block number
int bnc = buffer[2] & 0xff; // one's complement to block #
if (
(bn != ebn) && (bn != (ebn - 1)) ||
(bn + bnc != 255)) {
if (XModem.debug) {
System.out.println("NAK'ing type = " + type + " bn = " + bn +
" ebn = " +
ebn + " bnc = " + bnc);
out.write(NAK);
continue recv;
byte chksum = buffer[ (buffer.length - 1)];
byte echksum = 0;
for (int i = 3; i < (buffer.length - 1); i++) {
echksum = (byte) ( ( (echksum & 0xff) + (buffer[i] & 0xff)) & 0xff);
if (chksum != echksum) {
out.write(NAK);
continue recv;
out.write(ACK);
if (ebn == 255) {
ebn = 0;
else {
ebn++;
break;
// We got our block, now save it in our data buffer.
data = new byte[bs];
for (int i = 3; i < (buffer.length - 1); i++) {
data[(i - 3)] = buffer;
dataPos = 0;
public synchronized int read() throws IOException {
// If at the end of our buffer, refill it.
if (dataPos == bs) {
try {
getNextBlock();
catch (IOException e) {
throw new IOException();
// If we're still at end of buffer, say so.
if ( dataPos == bs) {
return -1;
int d = data[dataPos];
if (d == EOF)
return -1;
dataPos++;
return d;
* A wrapper around the native read() call that provides the ability
* to timeout if no data is available within the specified timeout value.
* @param timeout timeout value in seconds
* @throws IOException
* @return int an integer representing the byte value read.
private int readTimed(int timeout) throws IOException {
long start = System.currentTimeMillis();
for (; ; ) {
if (in.available() > 0) {
return (in.read());
try {
Thread.sleep(10);
catch (InterruptedException ex) {
//if (System.currentTimeMillis() - start > timeout * 1000) {
if (System.currentTimeMillis() - start > timeout * 5000) {
return -1;
Here was the output...
Original file:
(Commodore CBM SEQ file exported to PC using DirMaster)
��
� �
� ��
� ��
� ��
��
� ��
� � ��
��
� � ��OWERED BY �OLOR 64 �� V8
�UNNING �ETWORK64 V1.26A
�
�UPPORTING 38400 �AUD �ATES
��/��/��
�
�ESTING �CHO-�ET V1 BETA
�
�EATURING �ESSAGES, �ILES,
�ET�AIL, AND �NLINE �AMES!
�YS�P: � � � � � � � � �
�
�RESS ANY KEY TO LOGIN\C�
The result when the file was uploaded and received by my XServer:
? ? ??OWERED BY ?OLOR 64 ??? V8
?UNNING ?ETWORK64 V1.26A
?UPPORTING 38400 ?AUD ?ATES
?ESTING ?CHO-?ET V1 BETA
?EATURING ?ESSAGES, ?ILES,
?ET?AIL, AND ?NLINE ?AMES!
?YS?P: ? ? ? ? ? ? ? ? ?
?RESS ANY KEY TO LOGIN\C?
The result is different!
Can someone help me along here... I have been trying to figure out how to do this for approx. a year or so... it has been a very slow process.
I could use a guru to help me out so I can write the upload and download routines for my Commodore BBS PETSCII Emulation Server.
Visit http://www.retrogradebbs.com for details.
Thanks.
Please help out a dedicated developer who is in over his head...
-Dave

Ok. Fair enough. What about general information about Xmodem. This is a hard project because of how obscure the legacy technology is that I am having to implement using Java and MySQL.
I have two major issues which I have to figure out how to troubleshoot and debug, if possible.
1. The 23+ blocks exception when a file is being received
2. The exception which is thrown immediately if I try to receive a binary file instead of an ASCII file.
I read that telnet is a 7-bit technology and that is why Xmodem, which is an 8-bit technology is not that popular as a viable protocol via telnet, whereas Kermit is, since it was developed for 7-bit systems, i.e. mainframes and minicomputers.
Is this correct?
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I really want to learn how to implement a file transfer protocol, since back in the 80s, I used Xmodem, Punter, Y/Z Modem, etc., a lot to upload and download files via modem at baud rates of 2400, 14.4, 19.2, and 38.4, respectively.
It's fun to learn how the old skool gurus of telecommunications technology did it. It is one thing to run a BBS which supports these technologies and features, and it is an entirely other thing to learn how to design and develop them yourself for implementation into a project such as I taken on.
It CAN be done. It WILL be done. However, I have just started my exhaustive research on how it needs to be done. I have read up as much as I could on XModem by Ward C., the father of the protocol.
But, I have no information to help me figure out why the communications are acting as they do so far.
Can someone please download the xserver.zip file on my website at:
www.retrogradebbs.com/projects/xserver.zip
Compile it. Run it. Connect using HyperTerminal, Netrunner, or another telnet terminal emulation program which supports Xmodem file transfers using WinSock.
See what happens. With finals due in the next two days, this project will have to be put on hold until after I submit my two final projects.
If anyone knows what needs to be done to support both ASCII and BINARY file transfers via Xmodem via a socket instead of a modem with RTS/CTS hardware flow control, please respond.
I know for a fact that this can be done.
- Dave

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Thanks!
Fanny

How do I find the AS that this links to in my flash file via "find"?

I have a flash file that I have on a web page. When I hover over the Join Us image, the mouse changes to a hand. I can click on the "button" but it doesn't take me anywhere. I'm trying to find out if there is a way to find the link in my Flash file via the "Find" function. What is causing the "hand" to appear, is there a goto or click actionscript that I can search? It's a pretty complex file which I didn't create, and I've had no luck finding this button layer, or AS.
I'm hoping to find where this AS is and link it to a page on my site. Thanks!

Ned, you're back to save the day for me again. You helped me with the mask issue I had a few days ago and I'll have you know, the flash ad came out brilliantly. Everyone loved it.
So you were right, I did find the code AS3.
onClipEvent (load) {
    this.hitArea = this.area;
on (rollOver) {
    this.gotoAndPlay("s1");
on (releaseOutside, rollOut) {
    this.gotoAndPlay("s2");
on (release) {
s1 and s2 are animations where the Join Us text rolls out and Rolls in as different colors.
I added the following to the code and it seems to work great.
onClipEvent (load) {
    this.hitArea = this.area;
on (rollOver) {
    this.gotoAndPlay("s1");
on (releaseOutside, rollOut) {
    this.gotoAndPlay("s2");
on (release) {
          getURL("http://mysite.html", "_self", "GET");
Thanks again for pointing me in the right direction. I think I may owe you a lunch or something after this is all said and done!

Wanted to put a file via a drag and drop into applications on my finder sidebar. it missed and landed in the sidebar itself. i can not remove it. i can not even highlight it. how can i remove it from the sidebar.

I wanted to put a file via a drag and drop into applications on my finder sidebar. it missed and landed in the sidebar itself. i can not remove it. i can not even highlight it. how can i remove it from the sidebar.

Try holding down the Command key and dragging the file well off the sidebar.
Hope this helps.

Visual Studio 2013. Viewing a PDF file via the Web Browser control in Windows 8.1

I am writing a Windows Forms application in which I need to view PDF files via the Web Browser control. When the control is given the Navigate() command, Windows takes over and asks which program I want to open the file with. All was fine with VS 2010 and
XP. I have un-installed "PDF Complete", which was the default PDF viewer, but I now get asked for an alternative.
Thanks in advance.
Mike Saunders

Hi Mike,
It seems that we could use Internet Explorer to open a local .PDF file if it has the Adobe Reader. I doubt that the web control would be related to it. Like the MVP's suggset in the following thread, maybe it would be related
to certain plug-in tools in your side like the adober reader.
Reference:
https://social.msdn.microsoft.com/Forums/en-US/a717117e-41ae-4775-9c28-d5a1042b396e/pdf-is-not-opening-in-web-browser-control-in-vbnet?forum=vbgeneral
Best Regards,
Jack
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