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Re: sprintf and 64-bit integers
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Re: sprintf and 64-bit integers


  • Subject: Re: sprintf and 64-bit integers
  • From: Bill Bumgarner <email@hidden>
  • Date: Sun, 13 Sep 2009 11:01:21 -0700

On Sep 13, 2009, at 10:59 AM, email@hidden wrote:
I'm updating my code for Snow Leopard and ran into this problem. The
app crashes at this line:

sprintf(str, "%d", val);

where val is a CFIndex. According to the string programming guide here...

http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html

...I need to cast my CFIndex to long and replace the %d format
specifier to %ld. I tried that but still got the crash. So I kept
trying with all the format specifiers in the book, declaring my
variable a NSInteger, unsigned int, etc, but no matter what the app
kept crashing. The only that that actually worked was %lx, but then I
get the numbers all wrong. It seems that sprintf only accepts 32-bit
integers. Is this correct? If so, what's the workaround? I'm compiling
for both 10.5 and 10.6. Advice appreciated, thanks.

You are off in the weeds.

There is nothing about a value conversion that could cause a crash. Wrong value? Sure. But not a crash. Thus, the formatting string is *not* causing a crash.

The problem is almost assuredly that 'str' is pointing to garbage, uninitialized or otherwise wrong.

Post the code for how str is created.

b.bum

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