Hi Michael, I recommend not to use this argument in MacRuby at this point. it is safer to pass a value by assigning it as an instance variable of the observer/delegate/whatever receiver object instead, using #instance_variable_set. Laurent On Jan 9, 2010, at 12:01 AM, Michael Johnston wrote:

I'm working through the PragProg Core Data book, and have encountered an issue passing contextInfo to NSOpenPanel.beginSheetForDirectory

This issue was discussed on the list previously by Dr. Nic: http://www.mail-archive.com/macruby-devel@lists.macosforge.org/msg00330.html

The problem is that there doesn't seem to be a way to cast an object pointer to a void pointer in Macruby, but when openPanel calls the callback assigned in didEndSelector it does cast the pointer passed in contextInfo to a void pointer, leading to a type error when the callback is called:

{{{ 2010-01-08 23:44:49.580 GrokkingRecipesRuby[34059:10b] expected instance of Pointer of type `v', got `@' }}}

I tried assigning my object to a Pointer.new('^v') and Pointer.new (:uchar) but this also caused type errors.

is there any workaround for this?

Cheerio,

Michael Johnston lastobelus@mac.com

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