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How to add a conditional breakpoint in Xcode

Answer 1

+2 A:

GDB using conditional breakpoints from xcode is a little bit finicky. I often find myself eschewing the conditional breakpoints feature and just adding code like:

if (bytes == 0) {
    NSLog(@"here");
}

I'd put a normal breakpoint at the NSLog statement.

Matt Bridges 2009-08-05 04:03:37

Yep, that's exactly what I do.

Neil Daniels 2009-08-05 04:22:36

Answer 2

A:

So I add 'bytes==0' in the condition, but it never breaks.

Well, maybe that's because bytes is never 0?

Have you tried setting bytes to 0 right before your breakpoint so that your sure that bytes is 0?

I tried

int bytes = 0;
// Breakpoint here

and the breakpoint stopped when I had the condition bytes==0, but not when I had the condition bytes==1.

So that's why I have to assume that in your case bytes is never 0.

Erik B 2010-09-06 11:30:30

Answer 3

A:

I suggest NSAssert macro. This is widely used, and standard way for conditional break. As an example, this code aborts code execution of byte is zero.

NSAssert(bytes!=0,@"here");

Take care about preceding condition is passing condition. (not a fail condition)

If you're using default Xcode project configuration, the assertion code compiled when only in Debug build. They will be cleared in Release build. For more information about conditional compilation, dig about Xcode project setting entry Other C flags and NS_BLOCK_ASSERTIONS. (-DNS_BLOCK_ASSERTIONS) -D is compiler flag

Eonil 2010-10-23 07:36:54

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How to add a conditional breakpoint in Xcode

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