[ CCode ( instance_pos = 1.9 ) ]
public delegate bool AttachmentSaveFunc (uint8[] buf) throws Error
Specifies the type of the function passed to save_to_callback.
It is called once for each block of bytes that is "written" by
save_to_callback. If successful it should return true. If an error occurs it should set error and return
false, in which case save_to_callback will fail with
the same error.
| buf |
buffer containing bytes to be written. |
| count |
number of bytes in |
| data |
user data passed to save_to_callback |
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