variadic aliases in .gdbinit? - iphone

Question

Is this possible?
To make a concrete example, consider the following macro:
define pos
po ([self $arg0])
end
So now if I input pos text, it gets turned into po [self text]. But with multiple arguments, it fails, e.g. pos textLabel text gets turned into po [self textLabel] rather than the desired po [[self textLabel]text].
For another example, just as the three commands
po someIvar_
po [self someMethod]
po [[self someMethod]someOtherMethod]
print out the descriptions of the three objects referenced, it would be great to define a macro pi that does the same thing for integers, i.e.
pi [self someMethod]
is the same as calling
print (int)[self someMethod],
and similarly for
pi [[self someMethod]someOtherMethod].

Answer 1

user-defined commands are just a bit more than string-replaces before executing. Your example pos textLabel text passes two parameters to a command which only considers one parameter. The second is thrown away. It should result in po [self textLabel] before executing. What you do is comparable to the following java-sum-function: int sum(int[] args){return args.get(0);}
what you need is sth mentioned here :
define pos
if $argc == 1
po [self $arg0]
end
if $argc == 2
po [[self $arg0] $arg1]
end
..... (as many you need)
end
I have not found any kind of a loop. So this should be the only way to do this except it is possible to to pop arg0 out of args and recursive-calls of user-defined-commands are allowed. But I think its easier to complete the example above.
pi should be implemented the same way
define pi
if $argc == 1
print (int)[self $arg0]
end
if $argc == 2
print (int)[[self $arg0] $arg1]
end
....
end
maybe there is a better solution but this brings you a step further towards your destination.

Answer 2

If you are trying to use
po
pi
command in terminal to see the value of an object or you want to change the value at runtime so here is the solution:
Now here is the best solution to debug and analyze the objective c code in XCode 4. If you want to change the value of a variable at runtime you can change very easily by just Click "Run > Show > Expressions...
and there you can provide value to your variable name.
But I suspect that your problem is not the Objective-C problem, but still I did my best to provide the solution.