go也可以像普通的socket编程那样: 创建套接字 -> 绑定 -> 监听 …
当然,go中有net包可以使用,但是如果要实现一些比较底层的操作,例如自己构造数据包,就可以通过这种比较原始的方式来进行socket编程。
代码如下:
package main import ( . "fmt" "strconv" "strings" "syscall" ) func MAKEWORD(low, high uint8) uint32 { var ret uint16 = uint16(high)<<8 + uint16(low) return uint32(ret) } func inet_addr(ipaddr string) [4]byte { var ( ips = strings.Split(ipaddr, ".") ip [4]uint64 ret [4]byte ) for i := 0; i < 4; i++ { ip[i], _ = strconv.ParseUint(ips[i], 10, 8) } for i := 0; i < 4; i++ { ret[i] = byte(ip[i]) } return ret } func main() { var ( sock syscall.Handle addr syscall.SockaddrInet4 wsadata syscall.WSAData err error ) if err = syscall.WSAStartup(MAKEWORD(2, 2), &wsadata); err != nil { Println("Startup error") return } defer syscall.WSACleanup() if sock, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, syscall.IPPROTO_IP); err != nil { Println("Socket create error") return } defer syscall.Closesocket(sock) addr.Addr = inet_addr("61.135.169.105") addr.Port = 80 if err = syscall.Connect(sock, &addr); err != nil { Println("Connect error") return } var ( data syscall.WSABuf sendstr string = "hello" SendButes uint32 overlapped syscall.Overlapped ) data.Len = uint32(len(sendstr)) data.Buf = syscall.StringBytePtr(sendstr) //如果使用syscall.Sendto或syscall.Write会发送失败,原因未知 err = syscall.WSASend(sock, &data, 1, &SendButes, 0, &overlapped, nil) if err != nil { Println("Send error") } else { Println("Send success") } }
注意:syscall.Sendto和syscall.Write两个函数试过了会发送失败,而且我不知道什么原因,在windows环境下看来只能使用WSA****系列的函数进行发送数据包了,不过证明了Go也可以进行底层的网络编程而不借助Cgo
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