Re: sprintf and 64-bit integers
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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