valgrind

to run it:
valgrind --leak-check=yes myprog

To see where the time is spent
valgrind --tool=callgrind

kcachegrind: Graphical interface taking callgrind.out.*
.

sample Makefile

#

SOURCES=my_main.cpp

INC_PATH=~/tools/ImageMagick-6.6.5-4/Magick++/lib

LIBRARY_PATH=~/tools/ImageMagick-6.6.5-4/Magick++/bin

all:
    g++ -g -L$(LIBRARY_PATH) -O0 -o my_main $(SOURCES)

gdb

(gdb) kill ---> kill the session and keep your breakpoints...
(gdb) run ---> restart a new session
(gdb) info locals ---> local variables
(gdb) quit ---> exit gdb, lose your breakpoints...

(gdb) bt or backtrace ---> call stack
(gdb) bt full ---> call stack + all variables
(gdb) x/200s 0x89b8a8 ---> display mem as string

A blank line repeat the previous command

Debugging STL
Add a file .gdbinit to debug STL, see this link:
http://www.yolinux.com/TUTORIALS/GDB-Commands.html#STLDEREF

Then you can use it like this:
pmap params char* char*

See "Run / Debug Configurations" and debugger tab to specify a particular .gdbinit. Note that I had to add the .gdbinit full path, otherwise it would not work

gdb with arguments
gdb --args your_bin -c ~/2.2.25/etc -t 16

Debugging a core dump:
- gdb MyBin core.14694
and then bt for backtrace

.

Sorting

from wikipedia:

Name	Best	Average	Worst	Memory	Stable	Method	Other notes
Insertion sort	15 !	25 !	25 !	00 !	Yes	Insertion	Average case is also , where d is the number of inversions
Binary tree sort	50 !—	20 !	20 !	15 !	Yes	Insertion	When using a self-balancing binary search tree
Cycle sort	50 !—	25 !	25 !	00 !	No	Insertion	In-place with theoretically optimal number of writes
Selection sort	25 !	25 !	25 !	00 !	No	Selection	Its stability depends on the implementation. Used to sort this table in Safari or other Webkit web browser [2].
Bubble sort	15 !	25 !	25 !	00 !	Yes	Exchanging	Tiny code
Merge sort	20 !	20 !	20 !	50 !Depends	Yes	Merging	Used to sort this table in Firefox [3].
Quicksort	20 !	20 !	25 !	05 !	Depends	Partitioning	Can be implemented as a stable sort depending on how the pivot is handled. Naïve variants use space

Quotes

"If I asked my customers what they wanted, they'd have said a faster horse." Henry Ford

"If you can't see the future, you won't have one." Noah Everett

"People often overestimate what will happen in the next two years and underestimate what will happen in ten." Bill Gates

"I have had all of the disadvantages required for success." Larry Ellison 

"There is no point in starting your own business unless you do it out of a sense of frustration." R. Branson

"Il y a trois manières de se ruiner: le jeu, les femmes — et les ingénieurs. Les deux premières sont plus agréables — mais la dernière est plus sûre." Rothschild

"You have got to find a controversial strategy. The more controversial, the better. That’s the way to differentiate yourself from everybody else. Then you've got to get really good at what you’re doing. And that’s how you will beat the competition!" Scott Mc Neally

"Fire kept us warm and cooked our food but also burnt down our houses. Every technology has had its promise and peril." Ray Kurzweil

"On regrette de ne pas avoir fait, on ne regrette pas d'avoir fait" OH

"The great opportunities come when your business idea isn’t as much about the product but is a different view of the industry,"  Capital One Founder, Chairman, and CEO Rich Fairbank

"If I were to awaken after having slept for a thousand years, my first question would be: Has the Riemann hypothesis been proven?"  D. Hilbert (Quoted in Mathematical Mysteries : The Beauty and Magic of Numbers (1999) by Calvin C. Clawson, p. 258)

« Je suis dans l’œil du cyclone, il n’y a plus de ciel, tout est amalgame, il n’y a que des montagnes d’eau autour de moi », dernier message  de Alain Colas

"Listen, invent, personalize"  Jeff Bezos

"What do you want to accomplish in the 12 coming months ?"  Me

"it should not be the user that is searching for news/products, but the news/product that is coming to the user" Taboola

"It has been my experience that folks who have no vices have very few virtues."  Abraham Lincoln

"A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P if its performance at tasks in T, as measured by P, improves with experience E." "   Tom M. Mitchell. 

"A man is but the product of his thoughts; what he thinks, he becomes" ( By Mahatma Gandhi)

"Simplicity is the ultimate sophistication" (Leonardo da Vinci, repeated by Steve Jobs)

"Jerrold Zacharias, my mentor, told me "you are not as stupid as you look", and it is important that people tell you that" Rainer Weiss (nobel price in physics).

"Quand les hommes ne peuvent changer les choses, ils changent les mots" Jean Jaures

O Breizh, ma Bro, me 'gar ma Bro

"Dire fait rire, faire fait taire". Jean Le Cam

"La vie a plus d'imagination que toi"   mère de Najat Vallaud-Belkacem

"n’attendez pas que ça change si vous continuez à faire la même chose tous les jours" Ophely Winter

"Ton devoir réel est de sauver ton rêve" Modigliani

"Optimism is an essential ingredient of innovation. How else can the individual welcome change over security, adventure over staying in safe places" Robert Noyce

"il y a ceux qui voudraient bien, ceux qui veulent, et enfin ceux qui veulent absolument" Bernard Tapie

"The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark." Michelangelo

"I always invest in companies that can be managed by stupid people, because one day or another that happens" Warren Buffet

"“Le bonheur est souvent la seule chose qu'on puisse donner sans l'avoir et c'est en le donnant qu'on l'acquiert.” Voltaire

"le bateau à voile est le moyen le plus cher d'aller qq part gratuitement"

"Television is programs around advertisement" Sylvio Berlusconi

sous le 40eme degré, il n'y a plus de loi, sous le 50eme il n'y a plus de dieu (40eme rugissant, 50eme hurlant)

“Logic will get you from A to B. Imagination will take you everywhere.” –Albert Einstein

"Pour fonder une cité, il faut forger des mythes" Platon

"What we make stands testament to who we are" Jony Ive

"La pensée n’est qu’un éclair au milieu de la nuit. Mais c’est cet éclair qui est tout." Henri Poincaré

Design Patterns

• Creational patterns
Abstract Factory
Builder
Factory method
Prototype
Singleton ( + Double-Check Singleton )

• Structural patterns
Adapter
Bridge
Composite
Decorator
Facade
Flyweight
Proxy

• Behavioral patterns
Chain of responsibility
Command
Interpreter
Iterator
Mediator
Memento
Observer
State
Strategy
Template method
Visitor

Drupal Survival Kit

To make Drupal content private:
http://www.fbloggs.com/2009/06/11/how-to-make-content-private-in-drupal/

.

ovh google apps

Erreur du type:

"Ajouter un champ MX dans la zone DNS"
"Utilisez la section (email) pour modifier les champs MX"

Voici comment saisir les données MX:

RestEasy: JBoss project

RestEasy is a JBoss project that helps you build RESTful Web Services. It is JAX-RS compliant (Java API for RESTful Web Services).

It is designed for JBoss but I am actually using it with tomcat only. It is very easy to use in an Eclipse project. You can use:

JAX-RS Hello World with RESTEasy
.

Complexity of basic STL containers

\	.	possible implementation	insert/remove at the beginning	insert/remove at the end	find
vector	sequence, key not unique, back-insertion	dynamic array (malloc)	o(n)	o(1)	o(1) (operator[]) o(n) (iter or algo)
list	sequence, key not unique	doubly-linked list	o(1)	o(1)	o(n) (iter or algo)
set	sorted associative container, key unique	sorted tree	o(log(n))	o(log(n))	o(log(n))
map	sorted associative container, key unique	sorted tree	o(log(n))	o(log(n))	o(log(n))
hash_map	hashed associative container, key unique	hashmap	o(1)	o(1)	o(1)

Notes:

• for insert/remove in list, assumes we have the iterator at the right position
  
• no push_back on associative containers
  

Ones that I don't use often:

\	.	possible implementation	insert/remove at the beginning	insert/remove at the end	find
deque	sequence, key not unique o(n) in the middle	dynamic array or doubly-linked list	o(1)	o(1)	o(n)
slist	sequence, key not unique, single direction iterator, front-insertion	single-linked list	o(1)	o(n) o(1) if insert_after	o(n)

Sequence container
1. vector
2. deque
3. list
4. slist
5. bit_vector

Associative containers
1. set
2. map
3. multiset
4. multimap
5. hash_set
6. hash_map
7. hash_multiset
8. hash_multimap

Container adaptors
1. stack (LIFO)
2. queue (FIFO)
3. priority_queue
.

templates

simple template:

template < class F > class ClassTemp
{
public:
F test(F* feature );
};

template < class F >
F ClassTemp < F > ::test(F* feature) 
{
return *feature;
};

ClassTemp < char > myInst;

int main()
{
char c = 'c';
char ret = myInst.test(&c);
}

Note: since the compiler replaces the templates, source code of the templates needs to be included where it is used (template source code in the .h for ex).
.

blogger / blogspot

I now backup only Ubuntu related stuff since "max-results" is not taken into account anymore in the query

http://swiss-knife.blogspot.fr/search?q=ubuntu

to see all posts, or backup blogger blogs:

http://swiss-knife.blogspot.fr/search?max-results=1000&start=0

to insert an array in blogger, you need to put all the HTML on one line... Otherwise, the array is displayed way down.

to insert HTML in blogger posts, haven't found easier than putting "amp lt;" <  and "amp gt;" >
.

maven

maven

• to display all the targets:
  mvn -g > toto.txt
  
• List of targets are in project.xml, see "build" target
  
• "dist:" postgoals are described in maven.xml
  
• To add a jar like mysql, you need to add it to project.properties and project.xml
• Maven plugin for eclipse:
• http://download.eclipse.org/technology/m2e/releases

To create an exe from Eclipse

http://stackoverflow.com/questions/574594/how-can-i-create-an-executable-jar-with-dependencies-using-maven Note: use Maven/asembly and not Maven/Packaging

Maven System Properties

mvn assembly:assembly -Dmaven.test.skip=true   (doesn't build tests)

mvn assembly:assembly -DskipTests=true   (doesn't do tests, but build them)

• New Maven project for Eclipse 

1. from the command line:

 mvn archetype:generate -DgroupId=com.yourcompany.engine.api -DartifactId=EngineApi -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

2. cd EngineApi
3. mvn install
4. mvn eclipse:eclipse
5. Import the project into Eclipse as a maven project
6. Right click on the Eclipse project: "Maven / Enable Dependencies Management" then "Maven / Update Project Configuration"

• Maven/Eclipse problem
1. Right-click on your project, select Maven -> Remove Maven Nature.
2. Open you terminal, go to your project folder and do mvn eclipse:clean
3. Right click on your Project and select “Configure -> Convert into Maven Project”

• Create a pom compatible entry to be used as a dependency from a local jar file

mvn install:install-file -DgroupId=org.winterwell -DartifactId=jtwitter -Dversion=2.8.2 -Dfile=/home/lee/tools/JTwitter/jtwitter.jar -Dpackaging=jar -DgeneratePom=true

• if you lost or removed the /target folder
• mvn compile
• or
• mvn package  (creates also the package...)
• Lifecycle phases (generate-test-sources, etc)
• Lifecycle_Reference

• Snapshots
• Use a snapshot of another project in your dependencies
• need to do "mvn clean install" on the project we want a snapshot on
• <properties>
• <whatever-configuration.version>1.0-SNAPSHOT</whatever-configuration.version>
•  see what snapshots you have in
• ~/.m2/repository/fr/...
• if it doesn't find it on local, it gets it from nexus

 

Tomcat survival kit (Tomcat6)

Servlet container, no EJB support

/conf
Ubuntu: /var/lib/tomcat6/conf
W7: C:\Program Files (x86)\Apache Software Foundation\Tomcat 6.0
/usr/share/tomcat/bin/catalina.sh

To see access log on your Tomcat, add the following to your conf/server.xml :

&lt Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="common"/ &gt

to administer the modules
http://localhost:8080/manager/html
default user: "admin / no pw"
Otherwise, you can add
&lt user name="username" password="secret" roles="standard,manager" / &gt
in /Tomcat 6.0/conf/tomcat-users.xml

default location for war files
/var/lib/tomcat6/webapps
then you do: http://192.168.0.12:8082/sample/

for security reasons, slashes cannot be url encoded, like:
http://127.0.0.1:8080/getimagelist/http%3A%2F%2F
( %3A works but not %2F). See property
org.apache.tomcat.util.buf.UDecoder.ALLOW_ENCODED_SLASH: true|false

for memory setting like

JAVA_OPTS="-Djava.awt.headless=true -server -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m -XX:MaxPermSize=256m -XX:+DisableExplicitGC"

to make sure you don't use openJDK
edit /etc/init.d/tomcat6 and look for JDK_DIRS

if JAVA_HOME is not found when doing sudo /etc/init.d/tomcat start, do:
sudo -E /etc/init.d/tomcat start

other things:
./usr/share/tomcat6/bin/catalina.sh
/var/lib/tomcat6/conf/logging.properties

"too many open files" in catalina

• ulimit -a
  
  • pipe size (512 bytes, -p) 8

.

Android development

when you plug in a nexus and you do
./adb devices
you get:
List of devices attached
???????????? no permissions

What you need to do:
./adb kill-server
sudo ./adb start-server
* daemon not running. starting it now *
* daemon started successfully *
./adb devices
you get:
List of devices attached
HT019P803628 device

Then, if you don't have an emulator running, you can do:
./adb install ../platforms/android-2.1/samples/ApiDemos/bin/apis.apk

To get the debug trace on the host computer:
./adb logcat

Tesseract

To use Tesseract, you need an uncompress Tiff file. To do that:

C:\tools\ImageMagick-6.5.8\VisualMagick\bin\convert.exe c:\tmp4\toto.jpg c:\tmp4\toto.tif
C:\tools\Tesseract>tiffcp -c none c:\tmp4\toto.tif c:\tmp4\unc_toto.tiff
C:\tools\Tesseract>tesseract c:\tmp4\unc_toto.tif out

Go and read the OCR result in out.txt