Huh......
There are some .pdf file cannot be open in my RH8.0.
I open .pdf file by xpdf.Should I open these files which I cannot open by Acrobat Reader for Linux?
Thanks.

It would be usefull when you start the xpdf from a terminal with the -cmd option and copy-paste the result. There are absolutely no information in your post about the problem, e.g. what are the problematic .pdf files generated by, what xpdf version do you use, Acrobat Reader for Linux does open those documents, what says Acrobat Reader about those pdf files (properties, etc)...

"There must be a good question answered to be the problem solved"

You can get some to open but other won't, right?

I've got the same problem, Im usining KGhostView.

dudez! hold on a sec! please, insert some error logs or something to begin with...

Oh.....Sir,could you please tell me how could I copy-paste the result?
I have used the ksnapshot to get a result picture,but it seems that I cannot paste the .png file to the forum.......Or just tell me how could I copy-paste the result from the console.
Thanks very much.

Just run the program from a terminal and then post the errors that are printed to the terminal. YOu can also try installing gpdf or kpdf depending on whether you are running GNOME or KDE.

Oh....Finally,I get error result here,as follows:


[root@localhost root]# xpdf 001.pdf
Error:
Couldn't find cidToUnicode file for the 'Adobe-GB1' collection
Error:
Unknown character collection 'Adobe-GB1'
Error:
Couldn't find cidToUnicode file for the 'Adobe-GB1' collection
Error:
Unknown character collection 'Adobe-GB1'
Error:
Couldn't find cidToUnicode file for the 'Adobe-GB1' collection
Error:
Unknown character collection 'Adobe-GB1'
Error:
Couldn't find cidToUnicode file for the 'Adobe-GB1' collection
Error:
Unknown character collection 'Adobe-GB1'
Error:
Unknown font tag 'F2'
Error (403028): No font in show
Error:
Unknown font tag 'F3'
Error (403053): No font in show
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F6'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F3'
Error:
Unknown font tag 'F3'
Error: Unknown font tag 'F7'

And I got
kghostview: WARNING: KFilterBase::findFilterByExtension : no filter found for application/pdf

And another problem is I also get that error when on other PDF that actually work though, I try installing other software.

You are missing fontsets used by those pdf files.
from man xpdfrc:
" cidToUnicode registry-ordering map-file
Specifies the file with the mapping from character
collection to Unicode. Each line of a cidToUnicode
file represents one character:

hex-string

The hex-string is the Unicode (UCS-2) index for
that character. The first line maps CID 0, the
second line CID 1, etc. File size is determined by
size of the character collection. Only one file is
allowed per character collection; the last speci-
fied file is used. There are no built-in cidToUni-
code mappings."

you should try install/reinstall xpdf-config rpm package, it contains Adobe-GB1.cidToUnicode file
check with this command if you have the files:
find /usr/share/xpdf | grep -i cidtounicode

btw, what language does those pdf files have? Does it have some Asian language?
Keep us informed.

Yes,It has some Asian language(Chinese).

But....,bbk,how did you know that...?

'cause Asian languages do need Unicode to display all of their characters.
So, have you successfully managed the installation of the noted package and files?

If you still haven't resolved your problem... Try this method, it just work for me ...

I Open FireFox Brownser
click on preference
click on Downloads
click on Plugins to open
PDF file extension was enable ... I Double click too disable it ...
click ok to save

Now I when back to the PDF file on the internet and I click on it ...
Now I get a box that prompt me as to how I want to open PDF file with Adobe Acrobat

Problem resolved, I get prompt to open PDF file with Adobe Acrobat ...