[Fwd: Re: caching and XPCOM] (re-sent)

[Reshat Sabiq]

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On Sun, 2005-05-22 at 21:11 +0200, Christian Biesinger wrote:
> mozilla-netlib would be a better place for this, fwiw
> 
> Reshat Sabiq wrote:
> > I played w/ it a little more, and found the following:
> > The Cache folder above indeed stores temporary files, however, there are
> > 2 unknowns for me at this time:
> > 1. How would i be able to identify which file an object is in, knowing
> > the object's URL, and possibly other characteristics (size, etc.)? There
> > appears to be something like md5sum involved, on the basis of several
> > object characteristics.
> 
> So, not all entities are stored as separate files. If they are small 
> enough, they are stored in the _CACHE_00x_ files. Only if they are 
> larger they are stored as a separate file.
> 
> Use nsICacheService 
> (http://lxr.mozilla.org/seamonkey/source/netwerk/cache/public/nsICacheService.idl)
>  
> and related interfaces.
> 
> 
I am able to get the instances of interfaces needed, but i'm getting 
NS_ERROR_CACHE_KEY_NOT_FOUND for every image URL i pass to:
result = cacheSession->OpenCacheEntry(url, nsICache::ACCESS_READ, 
  PR_TRUE,  getter_AddRefs(cacheEntry));

I have 2 question about this, and would appreciate any feedback:
1. Why even when the image is in profile's cache as a separate file, i
still get this error? E.g., for char *url =
"http://us.news3.yimg.com/us.i2.yimg.com/p/rids/20050505/i/r1951409762.jpg?x=380&y=266&sig=Xj2W4LLjWxHTAWQ0QY9evA--";
which in my cache is stored as 3AAC0BF8d01. If the key is not URL, what
is it?
2. This may be resolved by 1, by do i understand correctly that if item
is not in the Cache folder, then it will have an ICache in memory? The
small images are not in the hard-drive at all. I guess when i know the
key magic from question 1, i will be able to see if i get an ICache for
these as well.

Thanks.

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