How to get/set properties?

[Marsu42]

Ok, simple /me is trying to add some saved/set properties to expo. presets (see http://www.magiclantern.fm/forum/index.php?topic=4861.0)... but in the meantime from when I last looked at the code I forgot again how the property thing works. Is there a tutorial somewhere on how to do it - via handlers or directly?

The three things I like to set are like this, but how do I get them in the first place - _get_prop(int prop) doesn't seem to be reliable?

Code Select Expand


prop_request_change(AF_MODE, &c_af, 4);
prop_request_change(PROP_DRIVE, &c_drive, 4);
prop_request_change(PROP_METERING_MODE, &c_meter, 4);


[1%]

Read them something like this:

Code Select Expand


PROP_HANDLER(PROP_AFPOINT)
{
    afp[0] = buf[0];
    afp[1] = buf[1];
    afp_len = len;
}



Set like this:

Code Select Expand


afp[0]=0xca00;
prop_request_change(PROP_AFPOINT, afp, afp_len);


[Marsu42]

Read them something like this

Doh, that was different than I expected - is this only like that for af points or the same for 1) drive and 2) metering modes, too?

[1%]

Some props have more buf

• maybe depending on size. These are only length of 4 so maybe prop ints.
  
  PROP_INT(PROP_AF_MODE, newaf);

[Indy]

http://magiclantern.wikia.com/wiki/Properties