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Problems
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1995-01-31
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Problems
========
This file is part of ArcWeb, and acts as a troubleshooting guide for those
who have had difficulty installing, configuring and operating ArcWeb. It
assumes that you have read 'Instruct' and all the ReadMe files.
Question Summary
================
Q1. I try to run !ArcWebImg and I get a message saying Find ChangeFSI before
loading.
Q2. When I try to load !ArcWeb, it says that it requires the DrawFile
module. What is it and where do I get it?
Q3. When I use the Open URL dialogue box and specify something like
http://www.demon.co.uk/ in the box, I get an error saying that no fetcher
is available for that URL.
Q4. When I try to use the Open URL dialogue box to open a local file using
local: URLs, I get an error saying that no fetcher is available for that
URL.
Q5. When I try to use the Open URL dialogue box to open a local file using
riscos: URLs, I get an error saying that no fetcher is available for that
URL.
Q6. Sometimes when I load a page, the inlined images are not displayed
Q7. I have heard that UniSys have been threatened to enforce a patent on
the GIF file format, as used by many WWW sites. Does this affect ArcWeb?
Q8. My icon bar is too full with the ArcWebImg and ArcWebLcl icons present
in addition to the main ArcWeb icon. How can I prevent this?
Q9. I don't have the ArcWebLcl or ArcWebImg icons on the icon bar. How do
I get them to appear so I can change the configuration?
Q10. How do I change fonts, colours and default options if I don't like
them?
Q11. How do I set up !ArcWeb for use on a shared network
Q12. I try to run ArcWeb and nothing happens/machine locks up/odd errors
appear (eg. Permission denied).
Q13. What does icon 'x' do?
Questions & Answers
===================
Q1. I try to run !ArcWebImg and I get a message saying Find ChangeFSI before
loading.
A1. ArcWebImg uses ChangeFSI as its image manipulator. It invokes it on the
command line to transform GIFs, JPEGs and other formats into RISC OS sprite
files. If the Filer has not seen ChangeFSI, then ArcWebImg does not know
where it will be able to find this tool. Open a directory viewer containing
!ChangeFSI and then try to run ArcWebImg again.
Q2. When I try to load !ArcWeb, it says that it requires the DrawFile
module. What is it and where do I get it?
A2. The DrawFile module is a relocatable module written by Acorn which
provides SWIs for drawing Draw files (as manipulated by !Draw) on the
screen. ArcWeb uses this module to reduce its own size (since the module
can be shared by many applications it can reduce memory requirements). You
can FTP it from from ftp.acorn.co.uk in /pub/riscos/releases/drawfile.arc
Q3. When I use the the Open URL dialogue box and specify something like
http://www.demon.co.uk/ in the box, I get an error saying that no fetcher
is available for that URL.
A3. ArcWeb is not supplied with fetchers for remote documents. These can be
found on the FTP server at Demon Internet in /pub/archimedes/www. You need
to run one of these HTTP fetchers alongside KA9Q (!TCPIP) in order to be
able to fetch these documents. At the time of writing, there are NO Acorn
TCP/IP fetchers available. This will change soon.
Q4. When I try to use the Open URL dialogue box to open a local file using
local: URLs, I get an error saying that no fetcher is available for that
URL.
A4. This may indicate that ArcWebLcl isn't running. ArcWebLcl is required
in order to fetch local: URLs. If it is running, then this indicates that
some failure occurred finding the file. This may be because:
i) the filing system you used does not exist
ii) the URL specified a non-existent file
iii) you did not specify the URL correctly. Remember that all / and .
characters after the :: in the filing system name, are transposed.
Q5. When I try to use the Open URL dialogue box to open a local file using
riscos: URLs, I get an error saying that no fetcher is available for that
URL.
A5. riscos: URLs were handled by earlier versions of ArcWebLcl. This URL
naming scheme is now obsolete, superceded by local: URLs, which you must now
use. NOTE: Running on old version of ArcwebLcl alongside the new ArcWebLcl
will not work, as support for the riscos: name system in ArcWeb itself has
been removed. This is because separate routines were needed for resolving
relative references involving riscos: URLs, and these no longer exist.
Q6. Sometimes when I load a page, the inlined images are not displayed
A6. This should have been fixed in version 0.13
Q7. I have heard that UniSys have been threatened to enforce a patent on
LZW compression as used by the GIF file format, as used by many WWW sites.
Does this affect ArcWeb?
A7. No. ArcWeb does not contain any code for handling GIF format graphics
files. It merely tests files for filetype &695 (GIF) or for starting GIF87a
or GIF89a. [GIF is a registered trademark (and service mark) of CompuServe
Inc.]
Q8. My icon bar is too full with the ArcWebImg and ArcWebLcl icons present
in addition to the main ArcWeb icon. How can I prevent this?
A8. Load ArcWebImg and ArcWebLcl and check their configuration carefully.
You should ensure that the 'Quit on ArcWeb quit' flag is set in particular
in each program. Save all the options. Now edit the !Run file inside
!ArcWebImg (hold down SHIFT whilst double clicking on the icon in a Filer
window). Load the !Run file into !Edit (or your favourite text editor) and
remove the '-iconbar' option on the last line of the file. Save it again.
Repeat for !ArcWebLcl. Now, neither of these helpers will install an icon
bar icon, and they will quit when you kill ArcWeb itself.
Q9. I don't have the ArcWebLcl or ArcWebImg icons on the icon bar. How do
I get them to appear so I can change the configuration?
A9. Edit the !Run file for each application (inside Helpers directory) and
add -iconbar to the last line in the file. Save it and run the applications
again and they will install their icons on the icon bar.
Q10. How do I change fonts, colours and default options if I don't like
them?
A10. There are two levels at which the changes can be made - system wide,
or user specific. ArcWeb checks the following files for font definitions
and colour schemes in this order: 1) <WebCache$Dir>.Choices
2) <ArcWeb$Dir>.Defaults 3) built-in defaults (you can't change these).
If !WebCache is local to your machine and not a per-user installation on a
network, then you should alter the version in the cache directory.
(Double-click SELECT on !WebCache and it will open the directory containing
Choices - edit that file). For network usage, the user should be
able to change this choices file. System-wide defaults can be set in the
<ArcWeb$Dir>.Defaults file. This is a copy of the supplied file in the
cache directory.
Edit the file in order to change the fonts used. Although there is no
restriction o how you can change the fonts, bear in mind that the italic
version of the body font should be the same size as the normal version of
the body font etc., otherwise you will get odd effects. Colours can also be
changed. You can set the foreground colour as three R,G,B quantities, and
if you wish you may also specify a further three values representing the
background colour hint. (See !ArcWeb.Defaults for an example).
Q11. How do I set up !ArcWeb for use on a shared network
In order to stop proliferation of ArcWeb into everyone's home directories,
ArcWeb is willing to cooperate in a network environment. !ArcWeb may be
installed in a read-only filing system, provided that no -debug option is
set for any of the helpers (which is the state in which ArcWeb is supplied)
Users will also need to have seen a !WebCache application to which they have
exclusive use and to which they have read-write access. Only one instance
of ArcWeb may use any !WebCache directory.
The system administrator may wish to edit !ArcWeb.!Run to refuse to run if
Arcweb$CacheDir is not set (as supplied, if it isn't set, it sets it to a
subdirectory of itself). The system administrator may choose to edit the
!ArcWeb.Defaults file to change any system wide options.
Q12. I try to run ArcWeb and nothing happens/machine locks up/odd errors
appear (eg. Permission denied).
A12. This might be caused by !WebCache not being installed in a read/write
filing system. Unless you have appropriate archiving software (eg. SparkFS
or ArcFS 2), you will have to extract the !WebCache application to a
writable filing system, and then double-click on the WebCache icon to
install it.
Q13. What does icon 'x' do?
A13. ArcWeb, ArcWebLcl and ArcWebImg all support interactive help. Load
the Acorn !Help application and you will be given help about the buttons
under the pointer when in an ArcWeb window. Note that in the window
displaying the page itself, the help is purely the URL which would be opened
if you were to click SELECT.
--
Stewart Brodie
31st January 1995