Developing Java Macros for and debuging them with Eclipse

13.06.2006 at 12:04

I recently had the pleasure to develop a Java Macro and from that expirience i can tell you that it is a pain in the ass.

No really, to start with the API is well not that simple and easy to work with. I understand that it is a complex task to create a cross plattform cross language, network aware component framework but the whole UNO thing is probably a bit over designed (see the Developer Guide with 1100+ pages).

Maybe i yust don't grasp it yet, so to let you judge yourself here is a junk of code. It's a simple helper class which demonstrates some basic functions like filling out form fields.

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Combine Winpooch and ClamWin to protect your Windows Clients with 100% free software

09.06.2006 at 14:41

You probably know clamav the popular opensource antivirus scanner which is widely used on mailservers etc. There is also a Windows Port, ClamWin available which can be used to scan files on the Windows platform. Unfortunately ClamWin currently lacks an on-access scanner, which is a must have for a modern desktop virus scanner.

This is where winpooch comes in. Winpooch is a API-Hooker that is it catches System calls checks them against a filter list and then proceed according to the configured action. Therefore it can be used to pass executed files over to ClamWin which checks them for viruses, resulting in an on-access scanner. If you are extra paranoid and don't care about potential performance issues you can even configure winpooch to call ClamWin on every opened file.

To configure Winpooch you have to go to the configuration tab and there select ClamWin as antivirus solution. If this is done, you should test your setup with a test virus. Download and run it, ClamWin should now detect the virus and Winpooch should ask whether you want proceed.

Winpooch also detects when a programm want's to place itself in a auto startup positon, for example via the registry or a startup folder, and asks if you want to allow or deny the action.

So you get a 100% opensource and free software antivirus/spyware solution for your Windows client computers.


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Using Debootstrap, Pbuilder and Co to build Debian Packages

09.06.2006 at 09:27

Building debian packages within your normal system can be quite dangerous because care has to be taken that the resulting binary won't link against wrong libraries etc. To simplify this process there are a few useful tools available. These can not only be used to build packages, other use cases include building a chroot environment from a given distribution or install a base system.

Creating a chroot environment

Debootstrap builds a chroot environment of a given distribution. First take a look at what will be installed.

debootstrap --print-debs sid .

if it looks ok then download the packages i prefer to keep them in a tarball for further use

debootstrap --make-tarball sid-chroot.tgz sid .

later you can use that tarball to actually extract the debs an install them into a given directory.

mkdir ~/sid-chroot && cd ~/sid-chroot
debootstrap --unpack-tarball sid-chroot.tgz sid .

so if everything worked so far you should now have a complete root filesystem which is ready to chroot into.

chroot . /bin/sh

Another package which can do nearly the same is cdebootstrap, it is mostly a reimplementation for debootstrap written in the c programming language for use in the debian-installer.

cdbootstrap -f minimal sid .

Compiling packages in a clean room environment

If you wan't to compile debian packages in a clean room environment then take a look at pbuilder. First you will need to create a build environment, as a side note pbuilder uses debootstrap to accomplish this.

pbuilder create --distribution sid

This will create a base.tgz file in /var/cache/pbuilder. By default changes to the pbuilder environment will be lost after logout. To prevent this you have to login as follows

pbuilder login --save-after-login

Now we are able to build actuall packages for example do something like

apt-get source gcc-4.1-source
pbuilder build *.dsc

Further information

For further information consult the manpages of the corresponding programs. In addition the following sites could be quite interesting.

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Getting a single line by line number with sed

20.05.2006 at 22:50

Well it turned out that i am not yet that comfortable in shell scripting. I often get error messages which indicating the line numbers which a problem occurs and i wanted to print that single line of a given file. So i ended up with a solution which was built upon a combination of head and tail, before i finally realised that sed is the right tool for the job.

sed -ne 7p filename

Prints out line number 7 of filename, if you want some context which is likely then supply a range instead of a single line, which can be accomplished as follows.

sed -ne 5,10p filename


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Avoid console beeping within VMware

20.05.2006 at 10:01

In the office where we have windows clients i quite often use VMWare to test something. In Debian by default the shell beeps if there are multiple possibilities after hitting [tab], well this gets pretty annoying over time. So the obvious and simplest solution would be to just disconnect the virtual sound device from the VM. However if you need/want sound in some cases this is not ideal. So i ended up with the following settings in my ~/.inputrc or sytem wide /etc/inputrc.

set bell-style none

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