Hello all,
Is there any way to initialise and use WebKit out of the main thread?
I know this message may look like good candidate for the Webkit-dev
mailing list, but I actually don't want to use WebKit directly, it's
just a consequence of trying to create NSAttributedString instance
from data in memory. Here is the longer story...
I need to create NSAttributedString objects and draw them onto the
NSImage object (which holds the current graphic context). The
attributed strings are created from data in memory buffer and since it
is not know at the time of creation what kind of data the buffer
holds, I use -[NSAttributedString
initWithData:options:documentAttributes:error:] method, which examines
the data and loads it using whatever format it seems to contain. Now,
according to the documentation:
"In Mac OS X v10.3, the options key @"UseWebKit" specifies that WebKit-
based HTML importing be used (and must be specified for the other
options to be recognised). In Mac OS X v10.4 and later, WebKit is
always used for HTML documents, and all of the options except
@"UseWebKit" are recognised (attribute identifiers are available on
Mac OS X v10.4 and later; use actual string value keys for Mac OS X
v10.3)".
Since the application in question supports Tiger and above, the WebKit
is always used. The problem is that string creation and drawing needs
to be executed in the secondary thread and then the WebKit complains
whenever the data in the buffer contains a HTML/XML document.
Sometimes an exception "Cannot use WebKit in secondary thread" is
thrown, and sometimes only a warning about threading violation is
printed out onto the console (with remark that it would be printed
only once) and creation of HTML-based attributed strings works, but is
very crash-prone. In any case, operation is far from being reliable.
Is there any way to solve this without jumping into the main thread
for strings creation?
Thanks in advance,
Milke
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