How to update Gdk-Pixbuf raw data?

["Z.Z." <z zojuji gmail com>]

Hello,
I am using gdk-pixbuf-0.22 and have a problem:
How can I update the pixbuf raw data?
There Is a pixbuf constructed from an Image file, I want to change raw data
behind It and upload new data back to pixbuf. I am using the
"gdk_pIxbuf_save_to_buffer" for accessing raw data, but I don't know how to
upload the buffer back to the pIxbuf!
Thanks, in advance,
Zahra Zojaji

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