[android-developers] Re: problems with fopen in native code

I have figured out my problem. When I converted the file path from
java String to c++ char*, I used GetStringChars(), which doesn't
automatically null-terminate the converted char*; so my fopen doesn't
get the right file name. More information can be found from:

https://groups.google.com/group/android-ndk/browse_thread/thread/e0ab7aefb3982c45
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4616318

On Jun 14, 2:43 pm, Frank <frank.android....@gmail.com> wrote:
> BTW, if I don't use fopen in my native function but instead use
>
> File file = new File("my file path");
> InputStream fis = new FileInputStream(file);
>
> and read from fis, it is always fine.
>
> On Jun 14, 2:38 pm, Frank <frank.android....@gmail.com> wrote:
>
>
>
>
>
>
>
> > Hi Nikolay,
>
> > I don't see any crucial differences between the two kinds of files. In
> > fact, for those bad ones, I can even sometimes open them correctly.
> > Strange!!!! Things are just un-deterministic. I checked errno, and the
> > message is "No such file or directory" (but the files are definitely
> > there).
>
> > Frank
>
> > On Jun 14, 9:52 am, Nikolay Elenkov <nikolay.elen...@gmail.com> wrote:
>
> > > On Wed, Jun 15, 2011 at 1:42 AM, Frank <frank.android....@gmail.com> wrote:
> > > > Hi All,
>
> > > > I am experiencing a strange problem of using fopen in native code. I
> > > > have a few files in /mnt/sdcard/Download and all of them have -rw
> > > > privileges. However, when I call my native function which in turns
> > > > uses fopen to open them, I got null returns for some files, but valid
> > > > returns for others. Why is that? Any insights? Thanks.
>
> > > The SD card uses FAT, so permissions shouldn't really matter.
> > > Check errno in your native code to see the actual error.
> > > What is the difference between the files that are OK and the
> > > ones that are not?

--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en