这是我的代码段。
if(TRUE == InternetGetConnectedState((LPDWORD)INTERNET_CONNECTION_LAN, 0))
{
GotoNextStep();
}
else
{
ShowErrorMessage(GetLastError());//弹出错误信息。提示“参数不正确”
}
各位dx看看那里不对。还是用其他方法。多谢。重分相谢。
if(TRUE == InternetGetConnectedState((LPDWORD)INTERNET_CONNECTION_LAN, 0))
{
GotoNextStep();
}
else
{
ShowErrorMessage(GetLastError());//弹出错误信息。提示“参数不正确”
}
各位dx看看那里不对。还是用其他方法。多谢。重分相谢。
if (InternetGetConnectedState(&dwFlags,0))
if (dwFlags&INTERNET_CONNECTION_LAN==INTERNET_CONNECTION_LAN)
MessageBox("已经使用MODEM连接到了Internet!","信息");
else
MessageBox("还没有连接到Internet!","信息");
if(InternetGetConnectedState(&flags, 0))
{
if(flags&INTERNET_CONNECTION_LAN==INTERNET_STATE_DISCONNECTED)
{
blOnline=FALSE;
AfxMessageBox("对不起,您没有连接网络!");
return false;
}
blOnline=TRUE;
return true;
}
vc7新的api,效果比较好,查阅一下msdn
From: Allen Weng <[email protected]>
Subject: RE: Detecting if internet connection is active at this moment.
Date: Friday, May 04, 2001 2:26 AMActually, there is no single function for determining if a machine is
connected to the Internet, and it is impossible to reliably determine what
is happening without side effects - such as automatic network connections
taking place. What you can do is reliably detect when there definitely
isn't an Internet Link: in the absence of any dial up or LAN connection the
system is definitely off line. Some techniques include:1. IsNetworkAlive()
If you are targeting system with IE5 or later, this is the best API call
yet it even listens for traffic on a LAN. There is a secondary function
IsDestinationReachable() which tries to resolve the hostname and ping it.
This does not work through firewalls, and overestimates speed as the max
the LAN card can support, rather than the actual point to point bandwidth.2. RasEnumConnections()
A reliable technique for modems and direct dial up networking, but not for
situations where Internet access is via a LAN. You should dynamically load
"RasEnumConnectionA" from "RASAPI32.DLL", as LAN installations of Windows
may not include the library.3. InternetGetConnectedState()
This Wininet /IE4 function call can distinguish between modem and LAN, but
can't handle complex LAN+autodial router situations. It is "offline state
aware". Important: handling of the offline flage changed for IE5 -it
returns TRUE for connected' even when off line, but signals the flags in
the LPDWORD parameter.4. InternetCheckConnection()
A Winnet/IE4 function call. This is meant to determine if a URL is
reachable- in practice it is pretty unreliable and best voided.5. NT SP4, NT5: The IP helper API can tell you which network interface to
use to connect to a supplied IP address, and what the bandwidth and current
status of that link is6. Using the Offline flag which is part of IE4 to allow users to manually
control the online/offline state of applications. This flag is stored in
the registry and can be manipulated via some funcions callsThese calls mostly determine the presence or absence of network connections
-not Internet access, so can't handle a home network sharing a dial up
connection, or two laptops connected directly to each other. The global offline state flag of IE4 (and hence win98, NT5) and the call to
test it - InternetGetConnectedState()- look the best long term options, but
will take time to become universal. The IP Helper APIs even let you find
out how much traffic is going over a link, but only detect the 'loopback'
interface on Windows 98, so is not a lot of use. Wouldn't a
'GetSpeedToHost() function call be great? Finally, whatever technique you use, when it's time to talk to a remote
site, always add timeouts or a cancel button. Even a quick functions like
gethostbyname() can lock up an app if something in the network chain is
broken. Allen Weng
Microsoft Developer Support
我不用VC7。所以IsNetworkAlive(...)不能用。
kingzai多谢了
结帐了。
另陌生人如果今天回家TEST OK明天我再开一贴来领分。