Re: Can't cache image
Re: Can't cache image
- Subject: Re: Can't cache image
- From: Brock Brandenberg <email@hidden>
- Date: Fri, 21 Mar 2003 13:51:18 -0600
Hi Ben.
>
I tried that first (I should have mentioned that). I didn't have the
>
setCacheMode line in my code. But when I started getting the "Can't cache
>
image" error, I figured I need to set the NSImage to not cache (I guess I
>
understood the error wrong).
>
>
So any other thoughts on what could be the issue? Could it be that init my
>
NSImage with just a size is not good enough to then lockFocus on? Sorry I am
>
pretty new to Cocoa, so I hope this isn't obvious (I tried searching the
>
archives).
I'd NSLog the size values after the statements:
NSImage *image1 = [[NSImage alloc] initByReferencingFile:[mergeArray
objectAtIndex:(numPages-(i+1))]];
and
[image1 setSize:NSMakeSize([image1 size].width*(204.0/72.0),[image1
size].height*(196.0/72.0))];
... and see if the size values are what you think they are. If you pass
{0,0} to NSImage, it will initialize, but will not work until you explicitly
set the size to a non-zero rect size.
Also, the initByReferencingFile: is a lazy method, so you may not have the
NSImage in a usable state at the time you want to access its properties. I
don't use this method, but there are some caveats to it so you might look at
its docs more closely or swap in initWithContentsOfFile: as a quick sanity
check. There is also an isValid method for NSImage to check its state. I
know the technique of initializing with a size and immediately locking focus
and drawing works because I'm using it now to resample images :)
Brock
----- industrial design @ www.bergdesign.com ------
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