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怎么放不上去 文本？ - App Inventor 2 中文网 - 清泛IT社区，有思想、有深度
转会员提问：怎么放不上去 文本？
根据提示这里不能放置文本块，需要放数学块。ip 一般是文本，端口一般都数字。
【ClientSocketAI2Ext】拓展报错信息如何自定义展示？ - App Inventor 2 拓...
目前该拓展报错（比如IP或端口不通）后，直接App崩溃退出，如下：
如何自定义并友好地展示报错信息呢？
一般地，使用屏幕1.出现错误 这个事件：
但是经过测试，此方式无效，系统还是按照自己的错误提示显示，并...
Bitwise operation and usage
...hexadecimal colours.
For example, here's a Python function that accepts a String like #FF09BE and returns a tuple of its Red, Green and Blue values.
def hexToRgb(value):
# Convert string to hexadecimal number (base 16)
num = (int(value.lstrip("#"), 16))
# Shift 16 bits to the right, a...
How can I check if an ip is in a network in Python?
...lt;<n-1) - 1
def dottedQuadToNum(ip):
"convert decimal dotted quad string to long integer"
return struct.unpack('L',socket.inet_aton(ip))[0]
def networkMask(ip,bits):
"Convert a network address to a long integer"
return dottedQuadToNum(ip) & makeMask(bits)
def addressInNet...
Windows、Linux开放指定端口 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Windows、Linux开放指定端口主机某些端口需要提供给外部访问，如MySQL 3306端口、svn 3690端口、WCF绑定端口等等，但一般情况下端口默认是被防火墙拦截禁止外部访问的。本文简要介绍了如何在不关闭防火墙的情况下开放指定端口。...
What is a non-capturing group in regular expressions?
...up 3: "n"
Group 4: "sectetuer"
...
So, if we apply the substitution string:
$1_$3$2_$4
... over it, we are trying to use the first group, add an underscore, use the third group, then the second group, add another underscore, and then the fourth group. The resulting string would be like the...
How to get the client IP address in PHP [duplicate]
...elds in your database.
If you are going to save the IP to a database as a string, make sure you have space for at least 45 characters. IPv6 is here to stay and those addresses are larger than the older IPv4 addresses.
(Note that IPv6 usually uses 39 characters at most but there is also a special I...
Getting MAC Address
...8927, struct.pack('256s', ifname[:15]))
return ':'.join(['%02x' % ord(char) for char in info[18:24]])
print getHwAddr('eth0')
This is the Python 3 compatible code:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import fcntl
import socket
import struct
def getHwAddr(ifname):
s = socke...
Linux iptables防火墙开放mysql、apache的端口 - 操作系统(内核) - 清泛网 ...
Linux iptables防火墙开放mysql、apache的端口vi etc sysconfig iptables 修改配置，添加两条tcp端口允许的记录：[root@iZ23rlmiwviZ ~] cat etc sysconfig iptables sample configuration for iptables service vi /etc/sysconfig/iptables 修改配置，添加两条tcp端口允许...
Linux scp 远程文件上传下载，指定端口 - 操作系统(内核) - 清泛网 - 专注C...
Linux scp 远程文件上传下载，指定端口linux-scp1、默认22端口上传、下载文件：scp test tgz root@xxx xxx xxx xxx: tmpscp root@xxx xxx xxx xxx: tmp test tgz 2、指定端口：scp -P8888 root@xxx xxx xxx xxx: tmp test tgz 1、默认22端口上传、下载文件：
scp test.t...