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

ImageMagick

• Windows7 / VisualStudio 2008 , To build it, get:
ftp://ftp.imagemagick.org/pub/ImageMagick/windows/ImageMagick-windows.zip unzip
When you open, build, and run: VisualMagick/configure/configure.sln
you get: VisualMagick/VisualStaticMT.sln
Now you can build ImageMagick.
To build a release of an exe using ImageMagick, I ran into VisualStudio libraries conflicts using STATIC_MAGICK. I built the "dynamic" ImageMagick using configure, and then I could have it to work fairly easily.

• To convert pictures using the command line:
  C:\tools\ImageMagick-6.5.8\VisualMagick\bin>convert "C:\Users\x\Downloads\2010-05-16 16.05.43.jpg" -resize 10% toto.jpg
  

• Ubuntu
$tar xvfz ImageMagick.tar.gz
$ cd ImageMagick-6.6.3-1
$ ./configure
$ make
$ sudo make install

ImageMagick-6.7.8-8/utilities/convert DSC_6093.JPG   -resize 40%   out2.jpg