network

调用Windows API 在C#中可以通过Pinvoke调用windows API方式来进行网络连接的检查： [DllImport("wininet.dll", SetLastError=true)] extern static bool InternetGetConnectedState(out int lpdwFlags, int dwReserved); [Flags] enum ConnectionStates { Modem = 0x1, LAN = 0x2, Proxy = 0x4, RasInstalled = 0x10, Offline = 0x20, Configured = 0x40, } MSDN地址 https://learn.microsoft.com/en-us/windows/win32/api/wininet/nf-wininet-internetgetconnectedstate 对应的返回值Description如下： Value Meaning INTERNET_CONNECTION_CONFIGURED0x40 Local system has a valid connection to the Internet, but it might or might not be currently connected. INTERNET_CONNECTION_LAN0x02 Local system uses a local area network to connect to the Internet....

代码 package main import ( "fmt" "syscall" ) func main() { l, _ := ListenNetlink() for { msgs, err := l.ReadMsgs() if err != nil { fmt.Println("Could not read netlink: %s", err) } for _, m := range msgs { if IsNewAddr(&m) { fmt.Println("New Addr") } if IsDelAddr(&m) { fmt.Println("Del Addr") } } } } type NetlinkListener struct { fd int sa *syscall.SockaddrNetlink } func ListenNetlink() (*NetlinkListener, error) { groups := (1 << (syscall....

_, err := conn.Read(make([]byte, 0)) if err!=io.EOF{ // this connection is invalid logger.W("conn closed....",err) }else{ byt, _:= ioutil.ReadAll(conn); } 注意：net: don’t return io.EOF from zero byte reads issue 参考 https://stackoverflow.com/questions/12741386/how-to-know-tcp-connection-is-closed-in-net-package