reading / finding files problems with Pocket PC

Archived from groups: comp.sys.handhelds (More info?)

On 7 Oct 2004 08:05:09 -0700, willem@schaik.com (Willem van Schaik)
wrote:

>Over the years I developed a "moving map" application
>(http://www.schaik.com/gps/pocketgem/) which runs fine on my Casio
>E125 PPC (Windows 2k PPC) and many other PPCs (like Dell, Compaq,
>etc.). One of my users tried to install it on his new iPac and the
>following problem developed.
>
>After startup the program reads a config file. It searches for that
>file in the directory where the program is installed (\Program
>Files\Pocket Gem\), but also in the root file system and even a few
>other directories. On my Casio, the file is opened successful, however
>on the iPac the program can't find it.
>
>When the program opens a new file for write, my Casio creates it in
>the program directory, while the iPac creates it in the root
>directory.
>
>Interestingly enough, the program can read files successfully through
>the "File -> Open" popup window I created, which allows you to browse
>to the right directory.
>
>My question is now, are there any differences between the older and
>newer versions of Microsoft's PPC OS, that I'm not aware of.

I haven't noticed any differences that might be relevant here.

The rest of this note mostly assumes you are using C/C++.

First, make sure you call GetLastError whenever CreateFile fail. You
can then either use Tools->Error lookup in the IDE or use
FormatMessage in your program. The code and corresponding string _can_
be cryptic and/or misleading, until you are used to them (sort of like
legal precedent and legal writing). So if you can't make sense of a
code, post it here, and someone will probably be able to.

My best guess is the path you specify when you try to open files is
wrong. So I would spend some time with a debugger, if possible. If
not, then try popping up a message box with the path of each file just
before you are about it.

If neither of those work, post some code here. Specifically, the code
you use to open these files.


>
>Thanks, Willem

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