iphone - How can i utilize/implement TFLogv -

i need generate local log file user can send mail, along testflight implementation.

from testflighapp doc,
using tflogv can have method accepts variable number of arguments passes format , argument list tflog.

so, think can capture whatever testflighapp intend send on server , have collected in local file.

so, please guide me if in right direction , how can make use of function.

you this:

void mylog(nsstring *format, ...) {     va_list arglist;     va_start(arglist, format);     nsstring *message = [[nsstring alloc] initwithformat:format arguments:arg_list];     va_end(arglist);      // send testflight     tflog(@"%@", message);     // todo: save log     // { code here } } 

and call mylog instead of tflog.