Re: [gmime-devel] resetting stream after g_mime_object_write_to_stream

[Oliver Giles <ogtifs gmail com>]

Hi Jeff,

Thank you for your reply, the earlier call to g_mime_stream_reset was 
just what I needed.

Regards,
Oliver

On Wed, Aug 21, 2013 at 2:24 , Jeffrey Stedfast <fejj gnome org> wrote:
> Hi Oliver,
>
> I've just fixed this in git master...
>
> [more below]
>
> On 8/20/2013 3:03 PM, Oliver Giles wrote:
> > I'm using gmime-2.6 on Arch Linux to manipulate a basic multipart 
> > file. Under a particular combination of actions I am no longer able 
> > to read data from the streams obtained from the content objects of 
> > individual parts:
> >
> > #include <gmime/gmime.h>
> > #include <stdio.h>
> > #include <errno.h>
> >
> > static void each_part(GMimeObject *up, GMimeObject *part, gpointer 
> > user_data) {
> > if(GMIME_IS_PART(part)) {
> >  GMimeDataWrapper* dw = 
> > g_mime_part_get_content_object(GMIME_PART(part));
> >  GMimeStream* ms = g_mime_data_wrapper_get_stream(dw);
> In the meantime, you can put a g_mime_stream_reset() right here.
>
> >  gint64 l = g_mime_stream_length(ms);
> >  char* s = malloc(g_mime_stream_length(ms));
> also, if the content stream is encoded (check 
> g_mime_data_wrapper_get_encoding()), then the content you get back 
> will be base64 or quoted-printable and not really readable.
>
> What you really want to do here is use 
> g_mime_data_wrapper_write_to_stream() so that it gets decoded.
>
> This would actually avoid your issue because 
> g_mime_data_wrapper_write_to_stream() resets the stream before and 
> after writing the data.
>
> If you want the content to be in a memory buffer, you can use a 
> GMimeStreamMem and then just dereference the GByteArray buffer that 
> backs the GMimeStreamMem.
>
> >  gint64 r = g_mime_stream_read(ms, s, l);
> >  g_mime_stream_reset(ms);
> >  printf("content object is %lld bytes long, read %lld bytes (%s)\n", 
> > l, r, strerror(errno));
> >  errno = 0;
> > }
> > }
>
> Hope that helps,
>
> Jeff