Does anyone have an example of a c++ TCP/IP client that works with labview TCP?IP server ??

I have the labview TCP/IP client/server working fine, but now I need to do this were labview is the TCP/IP server and the c++ program is the client. Does anybody have a simple C++ TCP/IP client that works with labview TCP/IP server ????

Thanks, you were right, we modified the c++ program to include the port # in the IP address and it worked.We also forgot to convert the port #. I included my labview and c++ program.
Attachments:
TCP-IP.llb ‏47 KB
client.exe ‏40 KB

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You could look into a Base64 encoding scheme:
//////////////////////license & copyright header/////////////////////////
// Base64 - encode/decode data using the Base64 encoding scheme //
// Copyright (c) 1998 by Kevin Kelley //
// This library is free software; you can redistribute it and/or //
// modify it under the terms of the GNU Lesser General Public //
// License as published by the Free Software Foundation; either //
// version 2.1 of the License, or (at your option) any later version. //
// This library is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU Lesser General Public License for more details. //
// You should have received a copy of the GNU Lesser General Public //
// License along with this library; if not, write to the Free Software //
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA //
// 02111-1307, USA, or contact the author: //
// Kevin Kelley <[email protected]> - 30718 Rd. 28, La Junta, CO, //
// 81050 USA. //
////////////////////end license & copyright header///////////////////////
import java.io.*; // needed only for main() method.
* Provides encoding of raw bytes to base64-encoded characters, and
* decoding of base64 characters to raw bytes.
* @author Kevin Kelley ([email protected])
* @version 1.3
* @date 06 August 1998
* @modified 14 February 2000
* @modified 22 September 2000
public class Base64 {
* returns an array of base64-encoded characters to represent the
* passed data array.
* @param data the array of bytes to encode
* @return base64-coded character array.
static public char[] encode(byte[] data)
char[] out = new char[((data.length + 2) / 3) * 4];
// 3 bytes encode to 4 chars. Output is always an even
// multiple of 4 characters.
for (int i=0, index=0; i<data.length; i+=3, index+=4) {
boolean quad = false;
boolean trip = false;
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if ((i+2) < data.length) {
val |= (0xFF & (int) data[i+2]);
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val >>= 6;
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return out;
* Decodes a BASE-64 encoded stream to recover the original
* data. White space before and after will be trimmed away,
* but no other manipulation of the input will be performed.
* As of version 1.2 this method will properly handle input
* containing junk characters (newlines and the like) rather
* than throwing an error. It does this by pre-parsing the
* input and generating from that a count of VALID input
* characters.
static public byte[] decode(char[] data)
// as our input could contain non-BASE64 data (newlines,
// whitespace of any sort, whatever) we must first adjust
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// (b) think that we miscalculated our data length
// just because of extraneous throw-away junk
int tempLen = data.length;
for( int ix=0; ix<data.length; ix++ )
if( (data[ix] > 255) || codes[ data[ix] ] < 0 )
--tempLen; // ignore non-valid chars and padding
// calculate required length:
// -- 3 bytes for every 4 valid base64 chars
// -- plus 2 bytes if there are 3 extra base64 chars,
// or plus 1 byte if there are 2 extra.
int len = (tempLen / 4) * 3;
if ((tempLen % 4) == 3) len += 2;
if ((tempLen % 4) == 2) len += 1;
byte[] out = new byte[len];
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int accum = 0; // excess bits
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// we now go through the entire array (NOT using the 'tempLen' value)
for (int ix=0; ix<data.length; ix++)
int value = (data[ix]>255)? -1: codes[ data[ix] ];
if ( value >= 0 ) // skip over non-code
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accum |= value; // at the bottom.
if ( shift >= 8 ) // whenever there are 8 or more shifted in,
shift -= 8; // write them out (from the top, leaving any
out[index++] = // excess at the bottom for next iteration.
(byte) ((accum >> shift) & 0xff);
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// these are used ONLY for padding to an even length and do not legally
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static private char[] alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
.toCharArray();
// lookup table for converting base64 characters to value in range 0..63
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static {
for (int i=0; i<256; i++) codes[i] = -1;
for (int i = 'A'; i <= 'Z'; i++) codes[i] = (byte)( i - 'A');
for (int i = 'a'; i <= 'z'; i++) codes[i] = (byte)(26 + i - 'a');
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codes['+'] = 62;
codes['/'] = 63;
// remainder (main method and helper functions) is
// for testing purposes only, feel free to clip it.
public static void main(String[] args)
boolean decode = false;
if (args.length == 0) {
System.out.println("usage: java Base64 [-d[ecode]] filename");
System.exit(0);
for (int i=0; i<args.length; i++) {
if ("-decode".equalsIgnoreCase(args[i])) decode = true;
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String filename = args[args.length-1];
File file = new File(filename);
if (!file.exists()) {
System.out.println("Error: file '" + filename + "' doesn't exist!");
System.exit(0);
if (decode)
char[] encoded = readChars(file);
byte[] decoded = decode(encoded);
writeBytes(file, decoded);
else
byte[] decoded = readBytes(file);
char[] encoded = encode(decoded);
writeChars(file, encoded);
private static byte[] readBytes(File file)
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try
InputStream fis = new FileInputStream(file);
InputStream is = new BufferedInputStream(fis);
int count = 0;
byte[] buf = new byte[16384];
while ((count=is.read(buf)) != -1) {
if (count > 0) baos.write(buf, 0, count);
is.close();
catch (Exception e) { e.printStackTrace(); }
return baos.toByteArray();
private static char[] readChars(File file)
CharArrayWriter caw = new CharArrayWriter();
try
Reader fr = new FileReader(file);
Reader in = new BufferedReader(fr);
int count = 0;
char[] buf = new char[16384];
while ((count=in.read(buf)) != -1) {
if (count > 0) caw.write(buf, 0, count);
in.close();
catch (Exception e) { e.printStackTrace(); }
return caw.toCharArray();
private static void writeBytes(File file, byte[] data) {
try {
OutputStream fos = new FileOutputStream(file);
OutputStream os = new BufferedOutputStream(fos);
os.write(data);
os.close();
catch (Exception e) { e.printStackTrace(); }
private static void writeChars(File file, char[] data) {
try {
Writer fos = new FileWriter(file);
Writer os = new BufferedWriter(fos);
os.write(data);
os.close();
catch (Exception e) { e.printStackTrace(); }
// end of test code.

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Business Development Manager
Preston Johnson
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[email protected]
www.ni.com/mcm
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www.ni.com/biganalogdata
512-683-5444
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wago_overview.doc ‏171 KB

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buffer_rs.vi ‏24 KB

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Does anyone have an example of a c++ TCP/IP client that works with labview TCP?IP server ??

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