Tech Blog of Edward – Page 3 – Remember the steps, do be do be do

Bitwise operation

12 December, 2017

Initialize char with zeros

char testing = 0;
// 0000 0000 (testing)

1 2	char testing = 0; // 0000 0000 (testing)

Align bits from the right

testing |= 3
// 0000 0000 (before)
// 0000 0011 (after)

testing |= 3

// 0000 0000 (before)

// 0000 0011 (after)

Shift bits to the…

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C++

fscanf problems with double

28 November, 2017

Trying to get input from the FILE* stream with image processing filter. Example One:…

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Algorithms, C++, std

std::map

29 July, 2017

Simple insert

map<string, int> dataMap;

// Two methods to insert
// 1. Insert with pair
dataMap.insert(pair<string, int>("TESTING", 1));

// 2. Insert with array
dataMap["TESTING"] = 1;

map<string, int> dataMap;

// Two methods to insert

// 1. Insert with pair

dataMap.insert(pair<string, int>("TESTING", 1));

// 2. Insert with array

dataMap["TESTING"] = 1;

Access to second element using key (C++ 11)

cout << dataMap.at("TESTING");

// Console output = 1

cout << dataMap.at("TESTING");

// Console output = 1

Iterate…

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std

std::set

29 July, 2017

Simple insert

set<int> s;
s.insert(52);

1 2	set<int> s; s.insert(52);

Quick match

const bool found = s.find(123) != s.end();

1	const bool found = s.find(123) != s.end();

Store search result

set<int>::iterator it;

it = s.find(123)

set<int>::iterator it;

it = s.find(123)

Check if…

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Discovery, MS Office, Python

SharePoint URL study

24 July, 2017

For each SharePoint URL, the pattern can be observed as:

https://yourSiteURL.aspx
?RootFolder = YourRootFolder
&FolderCTID = 0xYourIDHere
&View = YourViewIDHere

https://yourSiteURL.aspx

?RootFolder = YourRootFolder

&FolderCTID = 0xYourIDHere

&View = YourViewIDHere

Root folder is…

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MS Office, Python

Pyexcelerate write file

19 July, 2017

import pyexcelerate as pyex

dataWB = pyex.Workbook()
dataWS = dataWB.new_sheet("Database")

##### ROW & COL are NOT zero-based, i.e. 1, 2, 3 #####
dataWS.set_cell_value(row, col, "FOOBAR")

dataWB.save("OUTPUT.xlsx")

import pyexcelerate as pyex

dataWB = pyex.Workbook()

dataWS = dataWB.new_sheet("Database")

##### ROW & COL are NOT zero-based, i.e. 1, 2, 3 #####

dataWS.set_cell_value(row, col, "FOOBAR")

dataWB.save("OUTPUT.xlsx")

Selenium

Vimeo fetching video title

19 July, 2017

import selenium
from selenium import webdriver

driver = webdriver.Chrome()
driver.get('https://vimeo.com/manage/videos')

import selenium

from selenium import webdriver

driver = webdriver.Chrome()

driver.get('https://vimeo.com/manage/videos')

# Login 
driver.find_element_by_xpath('//*[@id="signup_email"]').send_keys("inputTheUserName")
driver.find_element_by_xpath('//*[@id="login_password"]').send_keys("inputThePassword")
driver.find_element_by_xpath('//*[@id="login_form"]/div[5]/input').click()

# Login

driver.find_element_by_xpath('//*[@id="signup_email"]').send_keys("inputTheUserName")

driver.find_element_by_xpath('//*[@id="login_password"]').send_keys("inputThePassword")

driver.find_element_by_xpath('//*[@id="login_form"]/div[5]/input').click()

Check if xpath exist in current page

def check_exists_by_xpath(xpath):
    try:
        driver.find_element_by_xpath(xpath)
    except NoSuchElementException:
        return False
    return True

def check_exists_by_xpath(xpath):

try:

driver.find_element_by_xpath(xpath)

except NoSuchElementException:

return False

return True

Load…

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Python

PyCharm setup scrapy (updated: Dec 2018)

10 July, 2017

Setup of PyCharm 2018 Download the .tar.gz from the official website Download PyCharm from…

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Linux, Python, Windows

Scrapy setup

7 July, 2017

Start a scrapy project at current directory

scrapy startproject tutorial

1	scrapy startproject tutorial

File structure

tutorial/
    scrapy.cfg            # deploy configuration file
    tutorial/             # project's Python module
        __init__.py
        items.py          # project items definition file
        pipelines.py      # project pipelines file
        settings.py       # project settings file
        spiders/          # spiders directory
            __init__.py

tutorial/

scrapy.cfg # deploy configuration file

tutorial/ # project's Python module

__init__.py

items.py # project items definition file

pipelines.py # project pipelines file

settings.py # project settings file

spiders/ # spiders directory

__init__.py

Set up…

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Linux, Python, Windows

Scrapy (web crawling) installation [Windows / Kali Linx]

7 July, 2017

For Python 2.7 / 3.3+ Windows Install scrapy using pip

pip install scrapy

1	pip install scrapy

Kali Linux…

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