Install Mono on CentOS

In addition to Mono website, Mono is available also at http://ftp.novell.com/pub/mono/download-stable/RHEL_5/x86_64/.

First, create a repository description in /etc/yum.repos.d. Create file mono.repo with content

[Mono]
name=Mono Stack (RHEL_5)
type=rpm-md
baseurl=http://ftp.novell.com/pub/mono/download-stable/RHEL_5/
gpgcheck=1
gpgkey=http://ftp.novell.com/pub/mono/download-stable/RHEL_5/repodata/repomd.xml.key
enabled=1

Second, install the Mono “server” stack:
        yum clean all
        yum install monotools-addon-server

Wait for all packages installed. The binary file will be installed at /opt/novell/mono/bin.

To setup the running environment, run
        source /opt/novel/mono/bin/mono-addon-environment.sh

To verify everything is installed:
        mono --version

Android App Architecture

This is a set of notes that I made for my own reference.

Android application does not have a main method as desktop application have. This is because Android application is invoked by the Android system whenever any part of the application is needed, and the Android will instantiates corresponding java objects. This is made possible by components based architecture.

Android application is a collection of components (activities, services, content provider, and broadcast receivers). Not all these components need to exist at the same time in the same application. But all the components share resources, e.g. databases, file systems etc.. The components communicate with each other by intents, which are described by a manifest in application package.

What is Activity and Service?

Activities are components in Android App to presents user interface, which is similar to like WinForms in .NET desktop application. A service is similar to activity but with no user interface. A service runs in the background all the time.

replicate directory structure only

To replicate a directory structure only:

find * -type d -exec mkdir [TARGETDIR]/\{\} \;

Air for Android

Missing functions from Air SDK

• activating phone vibration
• access android native contact list
• creating android intents
• messaging to status bar
• enable one air app to open another
• creating widgets

To convert desktop air app to android

• the WindowedApplication application MXML tag needs to be changed to ViewNavigatorApplication. WindowedApplication assumes there is a NativeWindow, which is not the case on Android.
• In the Application descriptor, the namespace must be 2.6 or later and the visible tag must be set to true.

The following desktop functionalities are not supported on Android:

ActionScript 2, ContextMenu, DatagramSocket, Dockicon, EncryptedLocalStore, HTMLoader, LocalConnection, NativeMenu, NativeWindow, PrintJob, SecureSocket, ServerSocket, StorageVolumeInfo, SystemTrayIcon, Updater, XMLSignatureValidator

LiveUpdate

on my mac, the live update come up every hour. To find out what’s causing it, the following are some useful commands:

1. check current live update settings

sudo symsched -l

Module Name On UI Freq Day Time Args

--------------

---

-------- --- --- -------- ----- ------ ----

LiveUpdate DefaultLiveUpdateSchedul 1 0 Hourly 04:33 "All Products"

It is set to hourly update and not in quiet mode.

1. delete current setting

sudo symsched -d all

1. add new policy

sudo symsched LiveUpdate "LiveUpdate" 1 0 -daily 09:00 "All Products" -quiet

1. check new settings

Module Name On UI Freq Day Time Args

--------------

---

-------- --- --- -------- ----- ------ ----

LiveUpdate LiveUpdate 1 0 Daily 09:00 "All Products" -quiet

Now it is running in quiet mode.

vsftp server

1. Start vsftp automatically

If the FTP service shall be operated with inetd we open the configuration file "/etc/inetd.conf" with an editor:

# ftp stream tcp nowait root /usr/sbin/tcpd in.ftpd
ftp stream tcp nowait root /usr/sbin/tcpd vsftpd


xinetd
It is recommended to start the vsftp daemon with xinetd which is more up to date than inetd. Some updates are e.g. logging of requests, access control, binding of the service to a specific network interface and so on. A very good introduction to xinetd can be found under [7]. After the modification restart of xinetd is necessary. The configuration of xinetd could look like this:

# vsftp daemon.
service ftp
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/sbin/vsftpd
per_source = 5
instances = 200
no_access = 192.168.1.3
banner_fail = /etc/vsftpd.busy_banner
log_on_success += PID HOST DURATION
log_on_failure += HOST
nice = 10
}

Retrieve Unique Values from gisdata

import arcpy
from arcpy import env

env.workspace = "c:/data"

patch_shp = "test.shp"

field = "GRIDCODE"

valueList = []

rows = arcpy.SearchCursor(patch_shp)
for row in rows:
    valueList.append(row.getValue(field))

uniqueSet = set(valueList)
uniqueList = list(uniqueSet)
uniqueList.sort()

del rows
del row

print uniqueList