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Sunday, February 19, 2017

Static Site Renderer (work in progress)

WIP (Qt)

1 manually trigger the QWebEnginePage::SavePage action========
    QMenu *menu;
    if (page()->contextMenuData().linkUrl().isValid()) {
        menu = new QMenu(this);
    } else {
        menu = page()->createStandardContextMenu();
    if (page()->contextMenuData().selectedText().isEmpty())
    connect(menu, &QMenu::aboutToHide, menu, &QObject::deleteLater);

2. ========

void TabWidget::downloadRequested(QWebEngineDownloadItem *download)
    if (download->savePageFormat() != QWebEngineDownloadItem::UnknownSaveFormat) {
        SavePageDialog dlg(this, download->savePageFormat(), download->path());
        if (dlg.exec() != SavePageDialog::Accepted)


Friday, February 3, 2017

Wagtail CMS (new site setup FreeBSD 11)

sudo pkg install bash

bash requires fdescfs(5) mounted on /dev/fd

If you have not done it yet, please do the following:

        mount -t fdescfs fdesc /dev/fd

To make it permanent, you need the following lines in /etc/fstab:

        fdesc   /dev/fd         fdescfs         rw      0       0
sudo pkg install emacs-nox11

To run tcsd automatically, add the following line to /etc/rc.conf:


You might want to edit /usr/local/etc/tcsd.conf to reflect your setup.

If you want to use tcsd with software TPM emulator, use the following
configuration in /etc/rc.conf:


To use TPM, add your_account to '_tss' group like following:

# pw groupmod _tss -m your_account

portsnap fetch extract


cd /usr/ports/lang/python3
make install clean BATCH=YES

cd /usr/ports/databases/postgresql96-server/
make install clean BATCH=YES

sudo /usr/local/etc/rc.d/postgresql initdb
The files belonging to this database system will be owned by user "postgres".
You can now start the database server using:

    /usr/local/bin/pg_ctl -D /var/db/postgres/data96 -l logfile start

su postgres
$ createuser freebsd
$ createdb gchen

sudo -u postgres psql postgres
(username postgres, databasename postgres) 
alter user freebsd password 'mypassword' 

cd /usr/ports/databases/postgresql-libpqxx
make install clean BATCH=YES

cd /usr/ports/www/nginx-devel/ && make install clean
cd /usr/ports/sysutils/py-supervisor/ && make install clean
cd /usr/ports/devel/py-virtualenv/ && make install clean  
cd /usr/ports/devel/py-pip/ && make install clean 
cd /usr/ports/devel/git
cd /usr/ports/graphics/jpeg
 sudo tzsetup 
virtualenv -p /usr/local/bin/python3 py3wt 
pip install -r mypip.txt (mypip.txt is the requirement file)
python migrate
python runserver 
python collectstatic


cd /usr/ports/security/py-fail2ban/ && make install clean
Please do not edit the fail2ban.conf and jail.conf files as they
will be overwritten upon each upgrade of the port.

Instead, create new files named fail2ban.local and jail.local

For more information, see the official manual:

If you are upgrading from 0.8.x consider adopting the new
configuration style.
sudo ee /etc/ssh/sshd_config
ChallengeResponseAuthentication no
sudo service sshd restart
binary: /usr/local/bin/python3.6 
cd /usr/ports/sysutils/tmux/ && make install clean
/usr/local/lib/qt5/bin/qmake -project
QT += core
QT -= gui
add cpp file, e.g. "main.cpp" 
/usr/local/lib/qt5/bin/qmake -makefile 
* To display images in proper positions,                 *
* you should set font size of your terminal emulator to  *
* "# of pixels per character" and "# of pixels per line" *
* in Option Setting Panel.                               *
*                                                        *
* For example, if you use 14 pixel fonts, the values     *
* should be these.                                       *
*                                                        *
* # of pixels per character = 7                          *
* # of pixels per line = 14                              *
Don't forget to add -pthread to your linker options when
linking your code.

You have built the Boost.Python library. You have to add the following
options when building your own code:

Compiler options:
   -I/usr/local/include/python2.7 -I/usr/local/include

Linker options:
   -L/usr/local/lib/python2.7 -L/usr/local/lib -lboost_python -lpython2.7
 cd /usr/ports/net/rabbitmq 
Compiler options:
   -I/usr/local/include/python2.7 -I/usr/local/include

Linker options:
   -L/usr/local/lib/python2.7 -L/usr/local/lib -lboost_python -lpython2.7
If you want to use mp3 audio conversion please make sure multimedia/ffmpeg is
built with the "LAME" option enabled.

Saturday, January 28, 2017

Wagtail CMS (new site setup UBUNTU 16.04)


sudo apt install virtualenv

virtualenv -p /usr/bin/python3 py3wt

source py3wt/bin/activate

pip install wagtail
wagtail start gchen 

cd gchen
setup database
sudo apt-get install postgresql-client
sudo apt-get install postgresql postgresql-contrib
sudo apt-get install pgadmin3
sudo apt install libpq-dev 
sudo -u postgres psql postgres
sudo apt-get install python3-dev  
\password postgres 
sudo -u postgres createdb gchen   (gchen is the database name)

pip install psycopg2
python migrate

python createsuperuser
python runserver


connect to database
sudo -u postgres psql postgres
(username postgres, databasename postgres) 


change password:

alter user postgres password 'postgres';

list database


sudo apt install supervisor
pip install gunicorn
python collectstatic

sudo apt install nodejs

Sunday, June 28, 2015

Set up Ionic in Mac OS X Yosemite

1. Here is the official guide:

2. Go to App Store, download Xcode and install it

3. Open Xcode

4. Xcode Menu → Preferences → Downloads → Components → iOS 8.2 Simulator (there are a few others, so pick iOS 8 that can run on iPhone 6)

5. Install Xcode Command Line Tools: Open a Terminal, type “xcode-select —install”

6. Install nodejs,, downlod “Mac OS X Installer (.pkg)”, open the download file and follow the installer to install Nodejs

7. Install cordova tool chains, open a Terminal, and type “sudo npm install -g cordova”

8. In a terminal, create a sample app, type “cordova create hello com.example.hello HelloWorld”

9. In the termial, go to your hello app, “cd hello”

10. In the termial, specify your build target, type “cordova platform add ios” (target is ios here, others like android, firefox, kindle fire, blackberry etc..)

11. In the termial, ready to build the project, type “cordova build”

12. Use Xcode IDE and ready to develop, so double clicking “hello/platforms/ios/HelloWorld.xcodeproj” (or a file ending with .xcodeproj)

13. There is a “Play” symbol/button on the Xcode IDE, you can click it and Xcode will launch the iOS simulator running your ionic Hello app.

14. And the rest is iterating your code and build. That is, modifying your project in Xcode, building your project in a terminal with “cordova build”, then click the “Play” button to test

Thursday, October 17, 2013

BeagleBone Black

Compared with Rasparry Pi, Beaglebone Black looks more developer friendly and more powerful. Remember to order extra hardware (temperature sensor,sound buzzer, LEDs, simple LCD screen,power supply etc) with your Beaglebone Black together, so you can use your Beaglebone to control them.

You will pay around $120, nice price to pay for teaching yourself embedded programming. For example, write your own electronic thermometer. :)

Sunday, February 10, 2013

BCD Adder (Binary-coded decimal)

Binary Code Decimal (BCD) Adder.

This is a tool that helps you add two decimals as BCD.

Why is BCD adder useful?

Double and Float sometimes do not meet the requirement of precision. For example, you cannot hold more than 17 digits in double.

With this BCD adder, you can add numbers with 10^18 digits!


Download (windows binary):

Monday, January 14, 2013

FreeNAS GUI Update

FreeNAS (GUI) Web-based upgrade  from 8.3.0  Release to 8.3.1 Beta2

1. Back up the configuration “System → Settings → General → Save Config”

2. Download the *.txz file. Upload it through the GUI,  Remember to specify the checksum.


3. Take about 5~10 minutes flashing the USB key, the machine reboots once, and I manually reboot it again

Old services are up and running after the upgrade. (Say the old config are good)