I have a PDF that I've loaded, combined with another PDF, and now I'm
ready to save the result as a new file. My program is using garbage
collection, but I understand that PDFKit is not garbage collected.
The problem is that I get reference count underflow error when writing
the PDF. Here is some code that is shorter, but creates the same
problem I'm having:
// Get PDF from disc
NSData *savedData = [[NSData alloc]
initWithContentsOfFile:@"oldfile.pdf" options:0 error:&error];
PDFDocument *savedDoc = [[PDFDocument alloc] initWithData:savedData];
// Write saveDoc to file
[savedDoc writeToFile:@"newfile.pdf"];
Actually, there is no problem when writing the file: newfile.pdf is
intact after the operation. But I get the following error in the
console:
malloc: reference count underflow for 0x13464c0, break on
auto_refcount_underflow_error to debug.
And when I break on auto_refcount_underflow, I get the following stack:
#0 0x94721a40 in auto_refcount_underflow_error
#1 0x9472d8e4 in Auto::Zone::dec_refcount_small_medium
#2 0x9472d9b0 in Auto::Zone::block_decrement_refcount
#3 0x931da50c in CFRelease
#4 0x904bfe4c in -[PDFDocument(PDFDocumentInternal)
writeToConsumer:withOptions:]
#5 0x904bd9fc in -[PDFDocument writeToURL:withOptions:]
#6 0x904bd97c in -[PDFDocument writeToFile:withOptions:]
#7 0x00006b60 in -[MyDocument openPanelDidEnd:returnCode:contextInfo:]
at MyDocument.m:495
Now, #3 suggests there is a release going on that shouldn't be; or at
least there should be an extra retain in my code. But when I add
"CFRetain(savedDoc);" before writing the file, the error still
persists. I've read the Semantics section of Using Core Foundation
with Garbage Collection, but I don't see a solution to this problem
there (I'm not saying it's not there, just that I don't quite see
it). Any help would be greatly appreciated.
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