Check your Internet Connection with C#

最新推荐文章于 2024-11-30 08:48:53 发布

LeoMaya

最新推荐文章于 2024-11-30 08:48:53 发布

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分类专栏： .Net 文章标签： internet c# function tutorials integer api

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本文介绍了一种使用C#语言通过调用wininet.dll中的InternetGetConnectedState函数来检查计算机是否连接到互联网的方法。该方法简单高效，仅需创建一个静态函数并返回布尔值即可判断当前设备的联网状态。

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How to check if your computer is connected to the internet with C#. It's much more easier that other tutorials I've seen in other sites. In deed, we're going to use a simple API function InternetGetConnectedState, to return a boolean variable.

This function takes two arguments :

The first one is an integer used with out keyword, that means that after calling the function, the variable will contain an interger that describes the connection state ( use of a modem, use of a proxy, offline mode...). Note that you must refer to www.msdn.com for more information about that.
The second one is a reserved variable that must be set to 0.

In this tutorial, we'll create a class with a static function that returns true if connected and false if not, using our API function in private state.

Check this out :

using System ;
using System.Runtime ;
using System.Runtime.InteropServices ;

public class InternetCS
{

//Creating the extern function...
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState( int out Description, int ReservedValue ) ;

//Creating a function that uses the API function...
public static bool IsConnectedToInternet( )
{

int Desc ;
return InternetGetConnectedState( out Desc, 0 ) ;

}