This may be of interest to some:

///////////////////////////////////////////////////////////////////////////////////
// console_stream.cs, version 1.0, copyright 2004
// IQFeed .NET C# sockets example using IQ32.dll
//
// contributed to the IQFeed Developer Support Forum
// by Dennis Sanders (forum username: Dennis)
// email: dennissanders@intsvcs.com
///////////////////////////////////////////////////////////////////////////////////

using System;
using System.Threading;
using System.Net.Sockets;
using System.Runtime.InteropServices;

public delegate void Callback(int x, int y);

class IQFeed_NETSocket_Example
{
[DllImport("IQ32.dll")]
public static extern void SetCallbackFunction(Callback SetGoodToGo);
[DllImport("IQ32.dll")]
public static extern int RegisterClientApp(IntPtr hClient, string szProductName,
string szProductKey, string szProductVersion);
[DllImport("IQ32.dll")]
public static extern void RemoveClientApp(IntPtr hClient);

public static bool GoodToGo = false;

public static void SetGoodToGo(int x, int y)
{
GoodToGo = (x==0 && y==0);

if (x==1 && y==1)
{
Console.WriteLine("IQFeed delivered close message");
RemoveClientApp(IntPtr.Zero);
}
}

public static void Main()
{
Callback IQFeed_CallBack = new Callback(IQFeed_NETSocket_Example.SetGoodToGo);
SetCallbackFunction(IQFeed_CallBack);

RegisterClientApp(IntPtr.Zero, "IQFEED_DEMO", "1.0", "1.0");

while (!GoodToGo)
Thread.Sleep(100);

try
{
String server = "127.0.0.1";
Int32 port = 5009;
TcpClient client = new TcpClient(server, port);

NetworkStream stream = client.GetStream();

String message = "S,KEY\r\n";
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
stream.Write(data, 0, data.Length);

message = "wMSFT\r\n";
message += "wIBM\r\n";
data = System.Text.Encoding.ASCII.GetBytes(message);
stream.Write(data, 0, data.Length);

data = new Byte[5120];

for(int x=0; x<20; x++)
{
String responseData = String.Empty;
Int32 bytes = stream.Read(data, 0, data.Length);
responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.Write(responseData);
}

client.Close();
}

catch (ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException: {0}", e);
}

catch (SocketException e)
{
Console.WriteLine("SocketException: {0}", e);
}

RemoveClientApp(IntPtr.Zero);

Console.Write("\nPress Enter to continue...");
Console.Read();

GC.KeepAlive(IQFeed_CallBack);
}
}

//////////////////////////////////////////////////////////////////////////////////////
// end - console_stream.cs
//////////////////////////////////////////////////////////////////////////////////////


Please post or email any questions, comments or improvements.

Regards,
Dennis Sanders
dennissanders@intsvcs.com

To build and run console_stream.cs from Visual Studio.NET:

Create a new Visual C# "Empty Project" in Visual Studio.NET
- In VS.NET go to File->New->Project->Visual C# Projects->Empty Project.
- Type in "console_stream" as the project name and select a location for the project folder.
- Accept the remaining defaults and click OK.
Add a new Code File to the Project
- In the Solution explorer (use View if you don't see it), right click "console_stream" (the project name).
- Select Add->Add New Item->Code File.
- Name the Code File console_stream.cs, click Open.
Copy and paste the posted code to the editing space for console_stream.cs.
- (...All indents will be magically restored, thank God!...)
Add System.dll to the References in your project.
- Right click References (below the project name in the Solution Explorer).
- Select Add Reference, then scroll down the selections under the .NET tab.
- Double-click System.dll, it should appear in Selected Components, then click OK.
(System.dll will be added as System under References.
Now Build the Solution
- Change Active Configuration if desired.(the default is Debug, but Release works as well)
- Then select Build->Build Solution

The project should build with 0 failed, 0 skipped (and no warnings).
- Any build errors can most likely be resolved by adjusting your path or other environment variables.

You will need a path to IQ32.dll (C:\Program Files\DTN\IQFeed on my computer) in order to successfully run the program.

To run console_stream.exe from Visual Studio press F5. Or, to run the .exe from Windows; exit Visual Studio and hunt down the console_stream.exe in you newly created project folder. When you find it...double click it.

If you have any questions or problems, please post or email.

Regards,
Dennis Sanders
dennissanders@intsvcs.com

To build and run console_stream.cs from Windows:

Create and name a new folder in a location of your choice.
Open the new folder in a window on your desktop.
Create a new C# Code File in the new folder using the posted code example.
- Open notepad (or a text editor of your choice), copy and paste the posted code to it.
- Using the brackets in the code as a guide, manually replace the indentions that were scrubbed in the forum post.
- Save the contents of notepad to your folder as console_stream.cs
Create a new compile.bat file using notepad.
- Select File->New from the notepad menu.
- Type "csc console_stream.cs" (do not include the quote marks).
- Save (File->Save As) the contents of notepad to your folder as build.bat

You should have two files in your folder; console_stream.cs and build.bat

Create the executable file console_stream.exe
- Double click build.bat

A new file, console_stream.exe should appear in the folder (if not, check the possible reasons below).
Double click console_stream.exe to run the new example.

Possible reasons console_stream.exe was not created or will not run.
- .NET Framework and/or .NET SDK are not installed on your computer (these are free from Microsoft).
- Your path does not include the directory (folder) that contains the .NET build command csc.exe
- Your path does not include the IQFeed directory (C:\Program Files\DTN\IQFeed on my computer).

Executing the build and/or run operations at the Windows Command Prompt will help you diagnose most problems.
Feel free to post your ideas/questions/problems to this thread, or send an email.

Regards,
Dennis Sanders
dennissanders@intsvcs.com

good,do you have a example for history data?
thanks

frankzhou,

I am attempting to create a .NET C# version of the VC++ History Example. However, with my current work load, it may be a bit delayed. When I have something useful (in whole or in part), I will post it to the developer forum.

Regards,
Dennis