Python basics : math functions, main funct

Math functions
#Unfortunately, you need to import math, but python has a nice library of math functions

import math
math.pow(2,3)
math.cos(math.pi/2)  #<-- radians!
math.pi
math.sqrt(4)

Main function

#Making a main function in Python is a little tricky. Here is an example:

def main(*args):
        if len(args) < 4:
                return
      
        print "main : args[0] ", args[0], " args[1]", args[1]
        print "(main) : args[1] ", args[2]
        print "(main) : args[3] ", args[3]
      
if __name__ == "__main__":

Mysql -- get table engine type

Get table engine type

You have to go to the mysql system database 1st

This allows you to see which type of table engine you're using

Common types:

myisam: doesn't support the features listed below for innodb
innodb (default) : supports r-trees (good for spatial extensions), enforces foreign keys, and supports transactions


select table_name, engine from tables where table_schema = "vsn";

Silent install of msp patch

msiexec /p mspfile.msp /qn

Checking versions if Office 2004 is at 11.5.5 and Acrobat is at 9.1.2

This is a trick to check version of some software on a group of computers


Here we're checking that Office 2004 11.5.5 update is installed

for ((i=1;i < 21;i++)); do if [[ $i -lt 10 ]]; then echo "station $i" ; ssh station-0${i}.local " ls -l /Applications/Microsoft\ Office\ 2004/Updater\ Logs/11.5.5\ Update\ Log.txt "; else ssh station-${i}.local " ls -l /Applications/Microsoft\ Office\ 2004/Updater\ Logs/11.5.5\ Update\ Log.txt "; fi; done

Here we're checking that Acrobat reader and acrobat are at 9.1.2


for ((i=1;i < 21;i++)); do if [[ $i -lt 10 ]]; then echo "station $i" ; ssh station-0${i}.local "system_profiler SPSoftwareDataType SPApplicationsDataType | grep '9.1.2' "; else ssh station-${i}.local " system_profiler SPSoftwareDataType SPApplicationsDataType | grep '9.1.2' "; fi; done

How to set up Jogre for the web

Set up jdk, apache tomcat, and hsqldb
==============================

apt-get install sun-java6-jdk
apt-get install tomcat5.5 tomcat5.5-wepapps tomcat5.5-admin
apt-get install hsqldb-server

Set up jogre
=========

wget http://voxel.dl.sourceforge.net/sourceforge/jogre/jogre_beta_0.3_bin.zip
cd /opt
unzip ~/jogre_beta_0.3.bin.zip
adduser jogre
chown -R jogre:jogre jogre
su jogre
cd
echo "export CLASSPATH=$CLASSPATH:/usr/share/java/hsqldb.jar:." >> .profile
source .profile
java org.hsqldb.Server &
cd /opt/jogre/server
chmod a+x *.sh


Configuration
==========

./server.sh &

#I prefer the gui; it's easier to just change the db settings with this tool
./administrator.sh &
#Login with admin, admin
#Change the database from xml to hsqldb
#The path to the db is jdbc:hsqldb:hsql://localhost/jogre_hsqldb

#restart the jogre server
killall server.sh
./server.sh &


#With apache tomcat admin (http://localhost:8180/admin), add jogreweb.war

How to start another X session

You already have X running and want to run another one.

1. Login into another virtual console
2. Open the terminal
3. startx -- :1

Tricks with the Echo command in XP

rem generate list with echo
for /l %a in (1,1,9) do echo "station-0%a"

rem Generate a file with echo to a room of computers
for /l %a in (1,1,50) do echo "station-%a" > \\station-%a\c$\myfile.txt

Printing from the command line in XP

rem Print from command line


notepad /p textfile.txt

Java - convert byte array to String

int len = (int)c.getLength();

            if (len > 0) {
                 int actual = 0;
                 int bytesread = 0 ;
                 byte[] data = new byte[len];
                 while ((bytesread != len) && (actual != -1)) {
                     actual = is.read(data, bytesread, len - bytesread);
                     bytesread += actual;
                    
                 }

//assuming utf-8 encoding
                 String test = new String(data,0,data.length,"UTF8");
                 System.out.println(test);

Java - how to make an anonymous thread

Creating an anonymous thread is pretty easy. If you want to make a thread that performs a simple operation anonymous threads can be convenient.

Java threads perform their task in the run() function, which is initiated with the start method.

Here is an example:

  Thread t = new Thread( new Runnable(){
              public void run(){
                     System.out.println("    do some work");
                         
                     
              }
          });
  
  t.start();

SVN commands

Creating a new repository for SVN

svnadmin create /path/to/svn/newrepository


Importing

svn --username user import http://svnsite.com/path/to/svn/newrepository -m "initial import"

#note about importing
#create a local folder called newrepository and put whatever code you want to import into newrepository
#run svn from newrepository


Permission denied when importing

# Do this on the server's svn directory

sudo chown -R www-data:www-data svn

Hello world Midlet

import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class LoginScreen extends MIDlet {

public LoginScreen() {
// TODO Auto-generated constructor stub
}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

protected void pauseApp() {
// TODO Auto-generated method stub

}

protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub

Form f = new Form("Login Form");
Display d = Display.getDisplay(this);
d.setCurrent(f);

f.append("Hello");

}

}

Flash tricks - global vars, functions, timers

Creating global var-
_global.myvar

Creating a timer-
var starttime = getTimer();
var atime=0;

while (atime < _global.timestop+starttime){

atime = getTimer();

if (_global.conn_state == true){
break;
}
}

Creating a function-
function populateJoin(){

gamelist.data = _global.currentmsg.split(_global.SEP);
gamelist.labels = _global.currentmsg.split(_global.SEP);


}

Photoshop Tricks - alpha channels and actions

Creating an alpha channel (ps cs2)-
magic lasso outside of the object
inverse select
go to channels
click save selection as channel
Now you can save with the alpha channel


Creating an action (ps cs2)-
Click the actions tab
Click new actions and click record
Do what you want to record and press stop

Automatically start action (ps cs2)-
go to file ->scripts
click scripts events manager
check the enable events to run scripts/actions
associate your action with an event

Java Me Notes

Links

Main site

http://java.sun.com/javame/index.jsp

Download

http://java.sun.com/products/sjwtoolkit/download.html

Eclipse plugin

http://download.eclipse.org/dsdp/mtj/updates/0.9/stable/

Need to use eclipse to export jad and jar for the project (which is in deploy)


Conventions

startApp() --> like main

import javax.microedition.lcdui.*; //required to use display

Display // interface with phone screen

Form //set up the screen then attach it to display

myform.append("some text"); //a label

Setting up hsqldb

hsqldb is a java based database server

Install it:

apt-get install hsqldb-server

Create the server.properties and sqltool.rc files in your home folder (sample files should be where hsqldb was installed)

The main jar file is /usr/share/java/hsqldb.jar, which should be in your CLASSPATH when working with hsqldb

Place a link in /usr/share/tomcat5.5/common/lib if you want to use it with tomcat 5.5.

There is a swing utility to test and manage the databases.

Starting the server:

java -cp /path/to/hsqldb.jar org.hsqldb.Server


Database URL:

jdbc:hsqldb:hsql://localhost/mydb

See list of mac file servers on network

This is quick way to get a list of appletalk machines on your network when you only have access to the terminal.

atlookup

Set remote desktop from command line

reg add "\\computer\hklm\system\currentcontrolset\control\terminal server" /v "fDenyTSConnections" /d 0 /t REG_DWORD /f

0 is off and 1 is on

Generate a command window for each iteration of a loop

rem This is good for those commands that take a lot of time.
rem Each iteration generates a new cmd window

for /l %a in (1,1,10) do start cmd /k psexec \\computer-%a time-consuming.exe

Force a live update from command line

This will perform a silent live update of Symantec Antivirus 10.2

"c:\Program Files\Symantec AntiVirus\VPDN_LU.exe" /fUpdate /s