png_get_text
Name
png_get_text -- get comments information from png_info structure
Synopsis
png_uint_32
png_get_text
(png_structp
png_ptr, png_infop
info_ptr, png_textp *
text_ptr, int *
num_text);
Description
png_get_text() returns the text chunk
information from the PNG stream in the array pointed to by
text_ptr. It also returns the number of text
chunks in num_text. text_ptr
is an array of structure png_text whose members
include:
compression | | type of compression used on text. Valid values are:
PNG_TEXT_COMPRESSION_NONE | PNG_TEXT_COMPRESSION_zTXt | PNG_ITXT_COMPRESSION_NONE | PNG_ITXT_COMPRESSION_zTXt |
|
key | | keyword for comment. Must contain 1-79 characters. |
text | | text comment for current keyword. May be empty. |
text_length | | length of text string after decompression. 0 for iTXt. |
Return Value
Returns 0
if png_ptr or
info_ptr is NULL
,
returns the number of text chunks otherwise.