How to debug C function in XCode Debugger

Question

In my iOS code, I have the following code

(char *)xmlTextReaderValue(reader)

How can I can see what this C function returns in XCode? I know that if it was Objective C object I could use po to print the object. Is there any alternative for C functions?

You drop the o from po and you're left with the p command... — user529758
– user529758, Commented Jul 9, 2013 at 14:54
By the way, this isn't really something about Xcode, it's rather about the lldb debugger it uses. (The same instruction works with gdb, of course.) — user529758
– user529758, Commented Jul 9, 2013 at 14:55

Ben S · Accepted Answer · 2013-07-09 15:02:07Z

1

If your char * contains printable data (like a well formed string that is NULL terminated, you can simply use the p command, explicitly casting the result:

p (char *) xmlTextReaderValue(reader)

answered Jul 9, 2013 at 15:02

Ben S

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2 Comments

Nikolai Ruhe Over a year ago

Since there's probably no type information and for C functions lldb can't query the runtime, you have to explicitly cast: p (char *) xmlTextReaderValue(reader)

Ben S Over a year ago

Thanks for the comment @NikolaiRuhe, added details to my answer.

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