Join the 80,000 other DTN customers who enjoy the fastest, most reliable data available. There is no better value than DTN!

(Move your cursor to this area to pause scrolling)

"I "bracket trade" all major news releases and I have not found one lag or glitch with DTN.IQ feed. I am very comfortable with their feed under all typical news conditions (Fed releases, employment numbers, etc)." - Comment from Public Forum
"DTN has never given me problems. It is incredibly stable. In fact I've occasionally lost the data feed from Interactive Brokers, but still been able to trade because I'm getting good data from DTN." - Comment from Leighton
"Thanks for following up with me. You guys do a great job in tech support." - Comment from Phelps
"Just a thank you for the very helpful and prompt assistance and services. You provided me with noticeably superior service in my setup compared to a couple of other options I had looked at." - Comment from John
"Everything is working amazing now. I'm already impressed with the true-tick feed of IQFeed and it's ability to support my 480 symbol layout." - Comment from Tyler via Email
"I've been using Neoticker RT with IQFeed for two months, and I'm very happy with both of the products (I've had IQFeed for two years with very few complaints). The service from both companies is exceptional." - Comment from Public Forum
"I am keeping IQFeed, much better reliabilty than *******. I may refer a few other people in the office to switch as well." - Comment from Don
"I ran your IQFeed DDE vs. my broker vs. a level II window for some slow-moving options. I would see the level II quote change, then your feed update instantaneously. My broker's DDE, however, would take as much as 30 seconds to update. I am not chasing milliseconds, but half a minute is unacceptable." - Comment from Rob
"I cannot believe what a difference it makes trading with ProphetX!" - Comment from Bruce in Los Angeles
"After all the anxiety I had with my previous data provider it is a relief not to have to worry about data speed and integrity." - Comment from Eamonn
Home  Search  Register  Login  Blogs Recent Posts

Information on Various DTN Products:
DTN IQFeed | DTN ProphetX | DTN Ag | NxCore
Follow DTN_IQFeed on Twitter
DTN.IQ/IQFeed on Twitter
DTN News and Analysis on Twitter
»Forums Index »IQFeed Developer »IQFeed Developer Support »We don't need RegisterClientApp anymore
Author Topic: We don't need RegisterClientApp anymore (3 messages, Page 1 of 1)

-Interested User-
Posts: 32
Joined: Aug 18, 2004

Posted: Feb 13, 2010 06:11 PM          Msg. 1 of 3
In the last email announcing the new release it said that IQ32.dll was depreciated and would eventually be removed. I thought to myself "If that's so, how do we do RegisterClientApp?" The answer is we don't. It is not needed anymore.

Here is a console application built with Visual Studio 2008. It is in C#:

using System;
using System.IO;
using System.Net.Sockets;

namespace Fundamentals {
class Fundamentals {
StreamReader streamReader;
NetworkStream IQStream;
TcpClient socket;

private void Run() {
Int32 portNumber = 5009;
try {
socket = new TcpClient("localhost", portNumber);
Console.WriteLine("socket has been initialized.");
} catch (Exception ex) {
Console.WriteLine("Error: " + ex.Message);


private void DownloadFundamentals(string sSymbol) {
try {
IQStream = socket.GetStream();
streamReader = new StreamReader(IQStream);

string quoteString = "w" + sSymbol + "\n\r";
byte[] outputBuffer = System.Text.Encoding.ASCII.GetBytes(quoteString);
socket.GetStream().Write(outputBuffer, 0, outputBuffer.Length);

string data = streamReader.ReadLine();
while (data.IndexOf("!ENDMSG!") < 0) {
if (data.Length > 0) {
if (data.IndexOf("..SYNTAX_ERROR..") < 0) {
if (data[0] == 'F') {
Console.WriteLine("Data: " + data);
} else {
Console.WriteLine("Error: " + data);
data = streamReader.ReadLine();
} catch (IOException ex) {
Console.WriteLine("DownloadFundamentals error: " + ex.Message);

static void Main(string[] args) {
Fundamentals go = new Fundamentals();

I hope this helps.


Charles Brauer

-DTN Guru-
Posts: 2034
Joined: Nov 21, 2005

Posted: Feb 15, 2010 10:45 AM          Msg. 2 of 3
Hello Charles, you are correct that with the current version of IQFeed, as long as the feed is already running, it is not absolutely required to call RegisterClientApp anymore. However, as I'm sure you are aware, the code posted above will not launch the feed. Furthermore, the feed must be initialized with a productID and version number (by any of the current methods) upon initial launch before it will allow any connections for data retrieval.

We also recommend that before any client connects to the feed, that you first register with the feed (even if it is already running and not absolutely required). Doing so will reduce the likelyhood that your app will break with future versions of the feed.

-Interested User-
Posts: 32
Joined: Aug 18, 2004

Posted: Feb 15, 2010 11:20 AM          Msg. 3 of 3
I'm aware that my example code does not launch the feed. I do that elsewhere. You said that IQ32.dll is depreciated. In the past I did:

[DllImport("C:\\Program Files\\DTN\\IQFeed\\IQ32.dll")]
public static extern int RegisterClientApp(
IntPtr hClient,
string szProductName,
string szProductKey,
string szProductVersion);

and I used RegisterClientApp. As I mentioned before, if IQ32.dll is no longer available (in future releases), and if you say that we still need to do RegisterClientApp, then how do we do that.

Some sample code would be greatly appreciated.



Charles Brauer


Time: Mon March 19, 2018 11:19 AM CFBB v1.2.0 16 ms.
© AderSoftware 2002-2003