Here I want to explain how to simulate Android Tab using Buttons.
One of the obvious question is why we need it !. Sometimes User is using track ball on the tabs. I don’t want any action on moving the focus , but I need action when he/she click.
Download the source code from here and run it on the simulator.
Adb tool is for managing Android devices or emulator.
$ adb devices // Will list the devices and emulator.
While I hit the command it shows my emulator, but the Motorola device is shown as ?????????????????? permission denied.
To solve this we should know the device vendor Id , use lsusb -v | grep [device name] to find it.
Create a file 51-android.rules which should contain a line
SUBSYSTEM==”usb”, SYSFS{idVendor}==”22b8“, MODE=”0666”
You should fill your device Id instead of 22b8. Done ! . Copy 51-android.rules to /etc/udev/rules.d.
Restart udev process : /etc/init.d/udev restart
Restart adb server : adb kill-server followed by adb start-server
Then you can see your devices by applying adb devices
It is very easy to add cgi-scripts in Apache. But most of the people (including ME) stuck with the problem Internal Server Error .You can see that error is because of BadHeader from one of log files (/etc/httpd/log) of Apache.
When writing the scripts we should add a blank line after the header. That’s ALL.
I wrote three CGI Scripts. copy it to “cgi” folder (read /etc/httpd/conf/httpd.conf to find the folder). And goto http://localhost/cgi-bin/hello.py . Make sure that python is installed in the system. You can download the source from here
I like to talk about sharing Windows drives in a network . My aim is to access these drives in Linux.
I have fc11 on my laptop (192.168.1.3) connected to BSNL Modem and a windows machine (192.168.1.2) .
Make sure that firewall is off and share
the drives appropriately.
Requirements in Linux are smbclient and mount programs.
1) smbclient -L 192.168.1.2
//This will print the drives and their status of the windows machine .
2) mkdir /mnt/windows
3) mount -t cifs //192.168.1.2/F username=guest,password=asdfgh /mnt/windows
// Where F may be the shared drive of Windows, that can be verified from first step.
I am selected in GSOC this year. My project is pydra. Pydra is a distributed and parallel computing framework for python.
My mentor is Peter Kreneskyp. The proposal is based on FunctionTask. I sent one patch regarding a ticket, which was accepted. I selected this project because I am interested in Python.
Thanks to Pramode Sir for motivating and helping me.
Here i like to talk about compiling the Erlang modules using Makefile. Makefiles are used for integrating different modules to form a single one. These are very helpfull in big projects.
I have two files in Erlang for computing double of a number. The main function is in main.erl and double function is in my_double.erl. The structure of the files are given below.
1 % main.erl
2 -module(main).
3 -export([start/0]).
4
5 % start function call double from my_double
6 start() ->
7 io:format(“Double ~w~n”,[my_double:double(2)]).
—————————————————————————————————
1 % my_double.erl
2
3 -module(my_double).
4 -export([double/1]).
5
6 double(N) ->
7 2 * N.
—————————————————————————————————
The Makefile is shown below
1 .SUFFIXES: .erl .beam
2
3 .erl.beam:
4 erlc -W $<
5
6 ERL = erl -noshell
7
8 MODS = main my_double
9
10 all: compile
11 ${ERL} -pa $(shell pwd) -s main start -s init stop
12
13 compile: ${MODS:%=%.beam}
14
15 clean:
16 rm -rf *.beam erl_crash.dump
——————————————————————————————————-
Typical Makefile has the structure
Target:dependencies
actions
For producing the target ‘make’ look for existence of dependencies and then execute the actions. There should be a “tab space” before the action. In this example the modules are defined in the line 8 and actions are described in line 10. When we type make it start from the “all” target. We have to look carefully the line 11, here “main” is the module name and “start” is the function to execute at first. If you want to pass parameters to the function “start” then it should be specified after the function name.
For example the line 11 is changed as follows if you want 23 as parameter
${ERL} -pa $(shell pwd) -s main start 23 -s init stop
This is not included in this source
The source can be downloaded from here
I consider December 2 to 4 to be some of the most memorable days of my life. We presented the robot without any problems. The whole stuff looks like a TANK.
Erlo-sapian
It got a lot of attraction. Many people are new to the Erlang language. Our motive was to popularize this functional language. We did not use the concurrency of this language. It was only a demonstration. The webcam functionality was not implemented.
I attended many talks and workshops. All the people were willing to express their ideas with a lot of explanation. I met many developers of KDE, and I am still in touch with them through IRC.
At the end of the last day, Dec 5, we lost our Erlang Robot from the stall. The whole work was lost. But the happiness of the exposure cured the sadness.
We are grateful to Pramode sir , who gave us these ideas, and to our Computer Science Department and Electrical Department for giving the facilities required.
Now I will explain the code for the robot. The name of the robot is ERLO-SAPIEN. Here Erlang code works as the server and C code as the client. The lower level parallel port functions are written in C. What Erlang does is just call these functions. So Erlang starts the execution by spawning two functions move and read_ir. Spawning is something “like” forking in C. The idea is that these two functions work in parallel. Two Erlang functions communicate to C functions through a Port.They can send messages to each other. Our simple model is the IR read function, which checks the status and gives orders to the move function according to the status. The move function moves the wheels and polls the read_ir for status.The code is very simple, and the problem is in the sleep function. Any way the things worked fine. We also tried image detection in OpenCV. But the problem was that the image did not match, because of the light variation. The source code has been published in the git repository .
Type the following commands in the System where internet is available
$ sysctl -w net.ipv4.ip_forward=1
$ iptables –table nat –append POSTROUTING –out-interface ppp0 -j MASQUERADE
Next command is issued in the client system
// Assigning gateway address
$ route add default gw [ip_of_system_having_net]
for example route add default gw 192.168.1.1
You should have a package “wvdial” which dials the modem
To install it
$apt-get install wvdial
Then you have to configure a file in /etc/wvdial.conf by
$wvdialconf //this will detect your modem and its speed
edit the page /etc/wvdial.conf
$vim /etc/wvdial.conf
[Dialer Defaults]
Init = AT+CGDCONT=1,”IP”,”airtelgprs.com”,””,0,0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
Stupid Mode = yes
Phone = *99#
Password = a
Username = b
Save the file and do $wvdial // you can see some messages in the terminal
open another terminal and type $ping google.com
and open a browser or type $firefox google.com
This configuration is only for connecting Mobile through usb..
If you want to connect it through bluetooth some more work is to be done…
First of all, install the bluetooth package
$apt-get install bluez-gnome bluez-utils
then configure the bluetooth connection by
$hcitool scan // you can see an ID and name of ur phone
Edit the file /etc/bluetooth/rfcomm.conf as follows
#
# RFCOMM configuration file.
#
rfcomm0 {
# # Automatically bind the device at startup
bind yes;
#
# # Bluetooth address of the device
device 00:1D:3B:09:12:C3;
#
# # RFCOMM channel for the connection
channel 1;
#
# # Description of the connection
comment “Dial-up Networking”;
}
then edit /etc/wvdial.conf as
[Dialer bluetooth]
Init = AT+CGDCONT=1,”IP”,”airtelgprs.com”,””,0,0
Modem Type = Bluetooth Modem
Baud = 460800
New PPPD = yes
Modem = /dev/rfcomm0
Stupid Mode = yes
Phone = *99#
Password = a
Username = b
Save the file and type
$wvdial bluetooth
and $firefox google.com //from another terminal
The complete wvdial.conf file looks like this:
[Dialer Defaults]
Init = AT+CGDCONT=1,”IP”,”airtelgprs.com”,””,0,0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
Stupid Mode = yes
Phone = *99#
Password = a
Username = b
[Dialer bluetooth]
Init = AT+CGDCONT=1,”IP”,”airtelgprs.com”,””,0,0
Modem Type = Bluetooth Modem
Baud = 460800
New PPPD = yes
Modem = /dev/rfcomm0
Stupid Mode = yes
Phone = *99#
Password = a
Username = b
If you have usb type
$wvdial //this will automatically dial the default part
If you have bluetooth type
$wvdial bluetooth
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