network awareness in windows获取windows网络状态

获取windows网络状态有三种方式：

InternetGetConnectedState(wininet.dll)直接获取
GetAdaptersAddresses(iphlpapi.dll)枚举网络适配器
Network Awareness
- NLA in Windows XP
- NLM in Vista or windows 7

源代码 source code

netaware - https://raw.githubusercontent.com/codepongo/utocode/master/windows/netaware.cpp

with iphlp - webkit的GetAdaptersAddresses方式的实现 webkit implementation
with nlm - NLM的同步实现 NLM synchronous implementation
with nlm event - NLM的异步实现 NLM asynchronous implementation
with wininet - InternetGetConnectedState的实现 InternetGetConnectedState implementation
with winsock - NLA的同步实现 NLA synchronous implementation
wait for change with winsock - NLA的异步实现 NLA asynchronous implementation
GetAdaptersAddresses方式的更准确实现可参考firefox的源码
- 如果确定不了网络是否连接（如API失败等情况），则返回已连接状态
- 通过获取AdapaterAddress AdapaterInfo和IPAddressTable进行综合判断
- 通过NotifyAddrChange(http://msdn.microsoft.com/en-us/library/windows/desktop/aa366329.aspx)异步通知伪代码如下：

def CheckAdapterAddress():
    addresses = GetAdaptersAddresses()
    for a in addresses:
        if a.OperStatus == IfOperStatusUp 
        and a.IfType != IF_TYPE_SOFTWARE_LOOPBACK
        and a.FirstUnicastAddress->Address.lpSockaddr != '192.168.0.1':
            return True;
    return False

def CheckAdaptersInfo():
    adapters = GetAdaptersInfo()
    for a in adapters:
        if a.DhcpEnabled:
            if a.DhcpServer.IpAddress == '255.255.255.255':
                return True;
            else:
                for ip in a.IpAddressList:
                    if ip == '0.0.0.0':
                        return True;
        return False;

def CheckIPAddrTable():
    tables = GetIpAddrTable()
    for t in tables:
        if t.dwAddr != 0 && t.dwAddr !=  0x0100007F:
            return True
    return False

reference 参考

标签: windows, webbrowser

日期: 2014-06-12 17:30:06, 10 years and 218 days ago