Month: September 2008

Troubleshooting: RoadNav Map Download Error

I had an error today trying to download maps for Arkansas.  I wish I could provide a fix, but all I can do at this point is raise awareness to the error.

map_error by you.

The error read:

Error reading (An error occurred during negotiation).

I did find a bug open on the issue:

Testing the SVN checkout

svn co roadnav

When I ran ./configure, I got an error message about wxWindows.  It said “checking for wxconfig… no”.  I found that I needed to install libwxgtk2.6-dev (apt-get install libwxgtk2.6-dev). I also installed the 2.8 version.  I don’t know which it used.

Here is how I compiled it — libroadnav first.

cd $HOME/bin/roadnav/libroadnav/trunck
./configure –prefix=$HOME/bin/roadnav
make install

Now just roadnav

cd $HOME/bin/roadnav/roadav/trunk
./configure –with-libroadnav=$HOME/bin/roadnav –prefix=$HOME/bin/roadnav
make install

WebDav and fstab

We have a webdav enabled web site that I wanted to connect to on a regular basis.  I wanted it to mount on my filesystem as opposed to just using it in nautilus so that I could use meld to copy files to it.

So, I added a line to the end of /etc/fstab   (sudo gvim /etc/fstab):

https://mywebsite/~docs    /dir/to/mount/on    davfs    user,noauto,rw    0    0

Then, I added the following line to /etc/davfs2/secrets:

https://mywebsite/~docs    myusername    mypassword

Originally, I had just the unsecure http:// url.  But, it gave me this error:

/sbin/mount.davfs: Mounting failed.
401 Unauthorized

I fixed it by changing the urls to https://.

When I mounted it as root, it worked fine.  But, when I mounted it as my regular user, I got this message:

/sbin/mount.davfs: program is not setuid root

To fix it, I had to run this command:

sudo chmod u+s /sbin/mount.davfs

Then, I changed the file /etc/davfs2/davfs2.conf.  I changed the dav_group setting.  For me, I found a line that said “dav_group staff”.  I replaced staff with my username, which is my default group.  The thread I read mentioned using the users group.


Oracle on Eclipse

I saw the new release today of Oracle Enterprise Pack for Eclipse.

I found this quote on Oracle’s website:

Eclipse is one of several open source communities (Apache, PHP, and Glassfish are other examples) in which Oracle invests significant development resources. A Strategic Developer and Board Member of the Eclipse Foundation, Oracle is a leading participant in the Eclipse Web Tools Platform and Technology projects.

It is just interesting to me since I work with Oracle’s PeopleSoft software.  I waiting for Eclipse to be used with PeopleSoft!

Jasper Reports

I have found Jasper Reports to be a great tool for allowing printing from Java-based applications.  I am using the iReports tool to create the reports in a GUI mode much like Crystal Reports.  Then, with a few lines of Java, I can display the report to view the report and allow him to print.

Jasper Reports Home Page

iReport Home Page

SourceForge Page

Right now, I am trying to figure out how to display totals on the page.  I found this nice article explaining the basics:

Open Source Reporting with JasperReports and iReports (Totals on Page 3)

Gpsd: Fixing for Ubuntu

I have an LT-20 Delorme Earthmate GPS.  It may not be the best GPS, but it gets the job done.  Getting it to work in Ubuntu was no easy feat.

I had to fix a bug in a cypress module.  I followed the instructions from here.

To get the kernel version, I ran:

uname -r

Then, to install the kernel source, I ran:

sudo apt-get install linux-source-2.6.24

Then, I changed directories into the installation directory and unzipped the source:

cd /usr/src
sudo tar -xvf linux-source-2.6.24.tar.bz2

Then, I copied the two files:

cd linux-source-2.6.24/drivers/usb/serial/
sudo mkdir /usr/src/modules
sudo cp cypress_m8.h cypress_m8.c /usr/src/modules/

Next, I created the make file (note that I have installed gvim.  I saw a note saying that they had problems using the gedit text editor):

cd /usr/src/modules
sudo gvim Makefile

And, I pasted these lines into the Makefile:

obj-m := cypress_m8.o
KDIR := /lib/modules/

$(shell uname -r)/build
PWD := $(shell pwd)
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

Then, I edited cypress_m8.c and commented out line 408.  The original instructions have more detail on this.  I thought the line number might be different, but it was the same as the original instructions.

When running make (sudo make) I had trouble with “make: Nothing to be done for `default’.” message.  I just opened the file and deleted and readded the tab in front of the last line.  Then, it ran fine.

Then, I ran the command:

sudo install -m 644 cypress_m8.ko /lib/modules/`uname -r`/kernel/drivers/usb/serial/cypress_m8.ko
sudo depmod -a


Convert Youtube Videos

I found this command that successfully strips the audio into a wav file:

ffmpeg -i Blessed_Be_Your_Name.flv -vn -acodec pcm_s16le \
   -ar 44100 -ac 2 Blessed_Be_Your_Name.wav

Here is the same command that includes the video that will play in Window’s Media Player:

ffmpeg -i Blessed_Be_Your_Name.flv -vcodec msmpeg4v2 -acodec pcm_s16le \
   -ar 44100 -ac 2 Blessed_Be_Your_Name.avi

I was able to use this command to convert an flv file from a downloaded Google Tech talk to an mp4 file that I could play with mplayer in Linux:

ffmpeg -i Using_bluemail_to_renew_the_design_and_study_of_enterprise_email.flv \
    -vcodec xvid -acodec pcm_s16le -ar 44100 -ac 2 \