Why is NSLogv procedure commented out in iOSapi.Foundation?
in iOSapi.Foundation.pas we have this line:
//procedure NSLogv(format: PNSString; args: va_list); cdecl; external libFoundation name _PU + 'NSLogv';
Why is it commented / deactivated? This procedure is defined as follows in the title:
FOUNDATION_EXPORT void NSLogv(NSString *format, va_list args) NS_FORMAT_FUNCTION(1,0) NS_NO_TAIL_CALL;
When I try to uncomment it, I have an error: va_list is not defined. If I'm not mistaken, is va_list just a pointer?
After calling this function? NB: I need to call this exact function and not any other log function ....
NSLogv
exists when you need to wrap the call with NSLog
your own variation function. But since you cannot write a variable function in Delphi, this scenario cannot be applied.
Call NSLog
. It is an externally defined variation function. While Delphi cannot be used to write such things, it is capable of absorbing them.
See this thread for more details: Difference between NSLog and NSLogv .
Further reading:
- https://en.m.wikipedia.org/wiki/Variadic_function
- http://docwiki.embarcadero.com/RADStudio/en/Procedures_and_Functions_(Delphi)#External_Declarations