Re: internet connection is up - C# Discussion Boards

26-Dec-02 2:13

I detect the internet connection with the following method
//*************************************
try
{
server = DNS.GetHostByName("www.yahoo.com");
}
catch(Exception)
{
Console.WriteLine("Internet Connection not found"); // fail
return ;
}
//***********************************************
But it takes times to find if internet connection is up. I need a faster method.
Is there any?

karanba

J. Schermerhorn26-Dec-02 10:55

J. Schermerhorn

26-Dec-02 10:55

Try using the Win32 InternetGetConnectedState() function.

-John

karanba27-Dec-02 0:46

27-Dec-02 0:46

Can you give me a short code example how to use this function in C#. Is there any resource to add with the project...
thanks.

karanba

grv57527-Dec-02 2:31

grv575

27-Dec-02 2:31

[System.Runtime.InteropServices.DllImport("wininet.dll")]
public static extern bool InternetGetConnectedState(IntPtr lpSFlags, int dwReserved);

if (!InternetGetConnectedState(new IntPtr(0), 0))
{
// not connected
}

J. Schermerhorn27-Dec-02 2:37

J. Schermerhorn

27-Dec-02 2:37

Try and use the following code. Other than the using System.Runtime.InteropServices, I have not added an additional resources to the project. I hope this helps you.

-John

<code>
using System;
using System.Runtime.InteropServices;

namespace CSProject
{
	/// <summary>
	/// Summary description for Class1.
	/// </summary>
	class ConsoleApp
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		[DllImport("wininet.dll")]
		public static extern bool InternetGetConnectedState(double dFlags);

		static void Main(string[] args)
		{
			double dFlags = 0;
			bool bResult = InternetGetConnectedState(dFlags);
			
                            Console.WriteLine("Internet Connection: {0}", bResult.ToString());
                            //
			// TODO: Add code to start application here
			//
		}
	}
}
</code>

karanba27-Dec-02 7:44

27-Dec-02 7:44

Thanx All a get what I need
Smile | :)

karanba

ISP

karanba26-Dec-02 2:05

26-Dec-02 2:05

How can I detect the ISP(internet service provider) with my program.
thanx

karanba

Tatham26-Dec-02 17:52

Tatham

26-Dec-02 17:52

The internet doesn't really work like this.

Try running pathping www.google.com at your command prompt. You could try running a trace like this from within .NET and look at the second or third hop but it wouldn't be very reliable.

To capture the ouptut of pathping off the command line see my other post at http://www.codeproject.com/script/comments/forums.asp?msg=375367&forumid=1646#xx375367xx[^]

Tatham Oddie (VB.NET/C#/ASP.NET/VB6/ASP/JavaScript)
tatham@e-oddie.com
+61 414 275 989

karanba27-Dec-02 0:12

27-Dec-02 0:12

thanx.
And I also what to detect current bandwidth. What could I do?

karanba

Tatham27-Dec-02 19:27

Tatham

27-Dec-02 19:27

Check out:

http://www.bandwidthplace.com/speedtest/[^]

You may be able to implement something like this.

Tatham Oddie (VB.NET/C#/ASP.NET/VB6/ASP/JavaScript)
tatham@e-oddie.com
+61 414 275 989

how can I get a reference type object memory size

Bog30-Dec-02 9:48

Bog

30-Dec-02 9:48

No. Bad. You can't ping someone else's website as part of your application or service unless you have an agreement with them. There is such a thing as a ping attack. ibm.com no longer responds to ping, for example, because people were using it in this way. If google decides to do the same, his app won't work anymore. Your solution is good if his app is noncommercial or not used by many people.

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

copy file?

imran_rafique26-Dec-02 1:12

imran_rafique

26-Dec-02 1:12

how to copy one file from one path to another path (and over wight it ).

r00d0034@yahoo.com

Re: copy file?

David23g27-Dec-02 11:56

David23g

27-Dec-02 11:56

You need to use the CopyTo() method of the FileInfo Class.

foreach (FileInfo file in filesInDirInfo)
{
file.CopyTo(newDirName);
}

david23g

fftongzhi25-Dec-02 15:07

Re: how can I get a reference type object memory size

25-Dec-02 15:07

I use a DataSet load a DBtable,and I want to know how many memory were used by the DataSet object.
sizeof keyword and System.Runtime.InteropServices.Marshel.SizeOf method can only be used for unmanaged objects.

how can I get a reference type object memory size???
Confused | :confused:

lost my way

Nick Parker25-Dec-02 17:52

Nick Parker

25-Dec-02 17:52

fftongzhi wrote:
how can I get a reference type object memory size???

You can do something like this:

     DataSet ds = new DataSet();
IntPtr p = Marshal.StringToHGlobalAnsi(ds.ToString());
MessageBox.Show("Size: " + Marshal.SizeOf(p));
Marshal.FreeHGlobal(p);

[EDIT] On second thought, that is only giving you the size of a string. I will have to look into this.[/EDIT]

Nick Parker

You see the Standards change. - Fellow co-worker

Re: how can I get a reference type object memory size

fftongzhi25-Dec-02 19:17

Re: how can I get a reference type object memory size

25-Dec-02 19:17

convert a object to string and get the string size,I have also felt that is a way.But some object contents can not conver to string ,you can just try this
byte[] bytelist=new byte[10]{1,2,3,4,5,6,7,8,9,10};
bytelist.tostring()=="byte[]" not the realy things we want. "12345678910"
so tostring can not get the size of a ref object :$
my method is write the object in to a memory stream and get the stream.length.
I feel some silly about this way，but where is the right way??
you can not get a object memory size in .net??? It means I made a world but I don't know what is it like!!! my god!!!!!!!!!!! Dead | X|

lost my way

Daniel Turini26-Dec-02 2:37

Daniel Turini

26-Dec-02 2:37

You could also try to serialize the object into a MemoryStream and get its size, but this has some drawbacks:

1. It's awful slow.
2. It will return a much bigger size than the real one, because it will include type info needed for the deserialization process.
3. It will only work on types marked [Serializable]

I see dumb people

Re: how can I get a reference type object memory size

fftongzhi26-Dec-02 14:25

Re: how can I get a reference type object memory size

26-Dec-02 14:25

Is that all the VM language have the same problem?
It also can not get a ref object size in java.
My god,we are in a unknowable world. Dead | X|

lost my way

leppie27-Dec-02 12:07

leppie

27-Dec-02 12:07

In the end the question stays, why, why on earth do u need the objects size? If its important, it should be defined as a struct or a sequentially layed out class.

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: how can I get a reference type object memory size

fftongzhi29-Dec-02 19:02