判断是否连接到Internet

最新推荐文章于 2018-02-16 18:19:43 发布

hudan

最新推荐文章于 2018-02-16 18:19:43 发布

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分类专栏： .NET 文章标签： internet system integer parameters network function

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今天下了一场大雪,时间过的真快，都初三了，再过几天就要上班了。
API: InternetGetConnectedState

Declare Auto Function InternetGetConnectedState Lib "wininet" (ByVal connectionDescription As Integer, ByVal tmp As Integer) As Boolean

bConnect = InternetGetConnectedState(0, 0)

我现在用手机拨号上网测试是可以正确检查状态的，上班后看看连接到局域网的情况如何？
再试试IsDestinationReachable()
－－－－－－－－
MSDN:

InternetGetConnectedState

Retrieves the connected state of the local system.

BOOL InternetGetConnectedState(

LPDWORD lpdwFlags,

DWORD dwReserved

);

Parameters

lpdwFlags

[out] Pointer to a variable that receives the connection description. This parameter can be one or more of the following values.

Value	Meaning
INTERNET_CONNECTION_CONFIGURED	Local system has a valid connection to the Internet, but it might or might not be currently connected.
INTERNET_CONNECTION_LAN	Local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_MODEM	Local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_MODEM_BUSY	No longer used.
INTERNET_CONNECTION_OFFLINE	Local system is in offline mode.
INTERNET_CONNECTION_PROXY	Local system uses a proxy server to connect to the Internet.
INTERNET_RAS_INSTALLED	Local system has RAS installed.

dwReserved

[in] Reserved. Must be zero.

Return Values

Returns TRUE if there is an Internet connection, or FALSE otherwise.

//-----------------------------------
#define INTERNET_CONNECTION_MODEM           0x01
#define INTERNET_CONNECTION_LAN             0x02
#define INTERNET_CONNECTION_PROXY           0x04
#define INTERNET_CONNECTION_MODEM_BUSY      0x08 /* no longer used */
#define INTERNET_RAS_INSTALLED              0x10
#define INTERNET_CONNECTION_OFFLINE         0x20
#define INTERNET_CONNECTION_CONFIGURED      0x40
//-----------------------------------