Re: [Vala] sqlite blob to GTK image

[Iñigo Serna <inigoserna gmail com>]

Hi,

On 17 July 2011 03:11, Markus Schulz <schulz alpharesearch de> wrote:
> Hello,
>
> I'm not very experienced with Vala or GTK and I was trying to display a
> jpg picture from a sqlite db... thanks the the Internet I was able to
> find some code from different sources to get it to work:
>
>                unowned uint8[] data = (uint8[]) stmt.column_blob(9);
>                data.length = stmt.column_bytes(9);
>                var data2 = data;
>                FileUtils.set_data("temp.jpg", data2);
>                Pixbuf pixbuf = new
> Pixbuf.from_file_at_scale("temp.jpg",320,240,true);
>                var image1 = builder.get_object ("image1") as Gtk.Image;
>                image1.set_from_pixbuf(pixbuf);
>
> However I'm not happy to have to save the data to a file... to load it
> again to display it. (I consier this a workaround)
>
> I'm sure there is a more elegant way doing this, could someone please
> give me a hint or point me in the right direction on how to do that.
>
> Thanks,
> Markus
>
> PS: this is for a ham radio exam study program:
> https://github.com/alpharesearch/HEH2011 that is still very alpha


I had the same issue a couple of weeks ago.
Here is the code I'm using:

            Gdk.Pixbuf pb;
            #if (GDKPIXBUF_HIGHERTHAN_212)
                var imgstream = new
GLib.MemoryInputStream.from_data(imgdata, null);
                pb = new Gdk.Pixbuf.from_stream(imgstream);
            #else
                FileUtils.set_data(TEMP_IMG, imgdata);
                pb = new Gdk.Pixbuf.from_file(TEMP_IMG);
                File.new_for_path(TEMP_IMG).delete();
            #endif


Hope it helps,
Iñigo Serna