On 10/31/05 4:13 PM, Mike Kluev didst favor us with:
> On Mon, 31 Oct 2005 13:54:57, Laurence Harris <email@hidden> wrote:
>
>> On 10/31/05 12:08 PM, Mike Kluev didst favor us with:
>>
>>> on Sun, 30 Oct 2005 22:09:00, Steve Baxter <email@hidden> wrote:
>>>
>>>> On 30 Oct 2005, at 21:31, Laurence Harris wrote:
>>>>
>>>>> On 10/30/05 4:03 PM, Steve Baxter didst favor us with:
>>>>>
>>>>>> I would use FSRefs by value here rather than storing pointers, i.e.
>>>>>> store the actual FSRefs in the vector rather than a pointer to a
>>>>>> FSRef. The overhead of copying 80 bytes will be so small as to be
>>>>>> unmeasureable. You may actually find that the copy overhead is less
>>>>>> than the malloc() overhead of allocating 80 bytes (but only Shark
>>>>>> will tell you).
>>>>>>
>>>>>
>>>>> Except it's not either/or. If you store pointers, such as is the case with
>>>>> a
>>>>> CF widget or a vector of FSRef pointers, once you allocate the memory for
>>>>> 80
>>>>> bytes, you still have to copy the FSRef into the allocated memory.
>>>>
>>>> True, true.
>>>
>>> Or FSGetCatalogInfo[Bulk] could do this copy itself.
>>
>> Not in this context. The FSRefs discussed are the directories returned by
>> FSGetCatalogInfoBulk which are being stored for retrieval later.
>
> Hmm...
>
> for (count = 0;;) {
> err = FSGetCatalogInfoBulk(iterator, 1, &actCount, NULL,
> kFSCatInfoNodeFlags, &info, &fsRefVector[count], NULL, NULL);
> if (err) break;
> if (info.nodeFlags & kFSNodeIsDirectoryMask) count++;
> }
> Here fsRefVector contains "count" subdirectory FSRefs stored or
> retrieval later.
No, it doesn't. It contains "count" subdirectory FSRefs at that point in
time. The code in question uses FSGetCatalogInfoBulk to iterate over a
directory adding up file sizes. Directories are pushed onto a stack and
popped off later after the current folder has been iterated completely
(which means the contents of the fsRefVector may have changed multiple
times).
"Later" in this context means after FSGetCatalogInfoBulk has been called
repeatedly until it returns errFSNoMoreItems. The FSRef buffer passed to
FSGetCatalogInfoBulk can't be used to store all the folders found in the
current directory. Really.
Larry
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