Re: [gmime-devel] resetting stream after g_mime_object_write_to_stream

[Jeffrey Stedfast <fejj gnome org>]

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