Bootstrap Footer Best Practice

see Sticky Footer

html {
    position: relative;
    min-height: 100%;
}
body {
    margin-bottom: 60px;
}
.footer{
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 60px;
    line-height: 60px;
    background-color: #f5f5f5;
}

Setting up Ubuntu 15.04 + PHP5.6 + Nginx + MySQL + Laravel 5 + npm + Bower + Gulp

1. install a brand new Ubuntu 15.04 amd64 version

2. uname -a

    Linux jasler 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

3. Setting root password

    sudo passwd root
    >> root

1. check if apache2 is installed and port 80 is being used

    ps -A | grep apache
    sudo netstat -nlp  | grep 80

remove if installed:

    sudo killall apache2
    sudo apt-get remove apache2

1. Install Nginx

    sudo apt-get install nginx
    nginx -v
        nginx version: nginx/1.6.2 (Ubuntu)

2. Install MySQL

    sudo apt-get install mysql-server

It will also install mysql-client and other dependencies in the meantime.

Press Enter on seeing a blank terminal to proceed.

Set the root password root for this time.

1. Install PHP5 and its extensions

    sudo apt-get install php5 php5-mcrypt php5-gd php5-mysql php5-fpm php5-curl

It also installs apache2 automatically, if it conflicts with nginx, we recommend to remove it.

Check the php and mysql version:

    php -v
    PHP 5.6.4-4ubuntu6.4 (cli) (built: Oct 28 2015 01:21:29) 
    Copyright (c) 1997-2014 The PHP Group
    Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
        with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies
 
 
    mysql -p -uroot -v
    Enter password: 
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 4
    Server version: 5.6.28-0ubuntu0.15.04.1 (Ubuntu)

1. Install npm

   sudo apt-get install npm
   npm -v
   1.4.21

update within it self:

    sudo npm install -g npm
    /usr/local/bin/npm -> /usr/local/lib/node_modules/npm/bin/npm-cli.js
    npm@3.8.3 /usr/local/lib/node_modules/npm

Or install this way:

    sudo apt-get install curl
    curl -sL https://deb.nodesource.com/setup > install.sh
    sudo chmod +x install.sh
    sudo ./install.sh
    sudo apt-get install nodejs
    sudo npm install -g npm

1. Install git

   sudo apt-get install git

2. Creating dev folder:

change usr to your account

    sudo mkdir /home/wwwroot/
    sudo chown -R [usr].[usr] /home/wwwroot

Cloning repo:

cd /home/wwwroot/
git clone ssh://git@yourrepo.com:/home/git/yourrepo.git

npm install (within vpn)

sudo npm install

Install composer

cd ~
php -r "readfile('https://getcomposer.org/installer');" > composer-setup.php
php composer-setup.php
sudo mv composer.phar /etc/php5/composer.phar
sudo chmod +x /etc/php5/composer.phar
sudo ln -s /etc/php5/composer.phar /usr/bin/composer

Install dependencies (vpn):

cd /home/wwwroot/wwwroot
composer install

Create Database and user, privileges:

mysql -p -u root
 
> create database yourdb;
> create user 'you'@'localhost';
> set password for you@localhost = PASSWORD('yourpasswd');
> grant all privileges on yourdb.* to you@localhost;
> show grants for you@localhost;
> flush privileges;

reset config for environment

cp .env.example .env
 
vi .env
 
DB_HOST=127.0.0.1
DB_DATABASE=yourdb
DB_USERNAME=yourame
DB_PASSWORD=yourpasswd

Database migration

php artisan key:generate
    Application key [s1ZYF0BZydwbRRcrNc58crIC20uwBRzT] set successfully.
php artisan migrate
php artisan db:seed

Install bower, gulp

sudo npm install bower -g
sudo npm install gulp -g

Bower install dependencies (no-VPN prefered)

bower install

Generate css, js etc. frontend files

gulp
 
gulp watch

Make a directory for log files,

sudo mkdir /home/wwwlogs
sudo chown www-data.www-data /home/wwwlogs

1. Reload Nginx

   sudo nginx -s reload

Check the status:

    sudo service nginx status

1. Restart Nginx

   sudo service nginx restart

sudo mv yoursite.conf sites-available/

C: char* conversion to LPCWSTR

#include <string.h>
#include <strlib.h>

LPCWSTR c2ws(const char* s){
 int len;
 int slength = strlen(s)+1;
 len = MultiByteToWideChar(CP_ACP, 0, s, slength, 0, 0);
 wchar_t* buf = new wchar_t[len];
 MultiByteToWideChar(CP_ACP, 0, s, slength, buf, len);
 LPCWSTR r(buf);
 delete[] buf;
 return r;
}

Install Pygame for Python 2.7 on Windows 64bit

Check here for pygame wheel.

My config goes like C:\WinPython-64bit-2.7.10.3\python-2.7.10.amd64, so it is a pre-compiled python bundle. The official site lists release only for 32-bit. But it gives the link to a wheel link.

Basically, this is a personal managed wheel list. Choose the follow wheel and install through pip command

pip install pygame-1.9.2a0-cp27-none-win_amd64.whl

Refs

• http://www.lfd.uci.edu/~gohlke/pythonlibs/#pygame
• http://pygame.org/download.shtml

Install Intel Dual Band Wireless-AC 3165 wireless driver on Ubuntu 15.04

Check your wireless card shipped

sudo update-pciids
lspci

I have,

...
07:00.0 Network controller: Intel Corporation Intel Dual Band Wireless-AC 3165 Plus Bluetooth (rev 99)

Copy firmware files

Clone all intel firmwares from OpenELEC repository,

git clone https://github.com/OpenELEC/iwlwifi-firmware
cd iwlwifi-firmware/firmware
sudo cp iwlwifi-7265*  /lib/firmware

Installing Driver

sudo apt-get install build-essential
git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git -b release/LinuxCore14
cd backport-iwlwifi
make defconfig-iwlwifi-public
sed -i 's/CPTCFG_IWLMVM_VENDOR_CMDS=y/# CPTCFG_IWLMVM_VENDOR_CMDS is not set/' .config
make -j4
sudo make install

It will output the following,

  Building modules, stage 2.
  MODPOST 6 modules
  INSTALL /home/jasler/backport-iwlwifi/compat/compat.ko
Can't read private key
  INSTALL /home/jasler/backport-iwlwifi/drivers/net/wireless/iwlwifi/iwlwifi.ko
Can't read private key
  INSTALL /home/jasler/backport-iwlwifi/drivers/net/wireless/iwlwifi/mvm/iwlmvm.ko
Can't read private key
  INSTALL /home/jasler/backport-iwlwifi/drivers/net/wireless/iwlwifi/xvt/iwlxvt.ko
Can't read private key
  INSTALL /home/jasler/backport-iwlwifi/net/mac80211/mac80211.ko
Can't read private key
  INSTALL /home/jasler/backport-iwlwifi/net/wireless/cfg80211.ko
Can't read private key
  DEPMOD  3.19.0-58-generic
depmod will prefer updates/ over kernel/ -- OK!
Note:
You may or may not need to update your initramfs, you should if
any of the modules installed are part of your initramfs. To add
support for your distribution to do this automatically send a
patch against "update-initramfs.sh". If your distribution does not
require this send a patch with the '/usr/bin/lsb_release -i -s'
("Ubuntu") tag for your distribution to avoid this warning.

Your backported driver modules should be installed now.
Reboot.

Links

1. list of intel linux wireless drivers
2. How can I install intel dual band wireless-ac 3165 drivers
3. iwlwifi core release
4. iwlwifi community

PyInstaller: Tweaking spec file

Install PyInstaller

pip install pyinstaller

Generate spec file

pyinstaller --onefile foo.py

Tweak spec file

             datas=[("myfile.txt", "."),
                    ("mydb.db", ".")
             ],
             hiddenimports=["packaging", "packaging.version", "packaging.specifiers"],

In one-file mode, no COLLECT is called within spec file, so finally there will be only one exe file generated.

Generate one-file exe

pyinstaller foo.spec

Python, OpenCV: Video Capture and Display

OpenCV: Video Capture

import time
import cv2

video_capture = cv2.VideoCapture(0)
while True:
    t0=time.time()
    ret, frame = video_capture.read()
    t1=time.time()
    print "passed ", t1-t0, "s"

    cv2.imshow('Video', frame)
    #on pressing "q" exit
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
        
video_capture.release()
cv2.destroyAllWindows()  

Frames Per Second Counter

#test how many frames per second for a webcam
import time
import cv2

video_capture = cv2.VideoCapture(1)
t0 = time.time()
i=0
while True:
    ret, frame = video_capture.read()
    print frame.shape
    t = time.time()
    if t-t0 > 1:
        t0=t
        print "frames ",i
        i=0
        
    i+=1    
                    
    cv2.imshow('Video', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
        
video_capture.release()
cv2.destroyAllWindows()