Using va_list to build a formatted string
Using va_list to build a formatted string
- Subject: Using va_list to build a formatted string
- From: Graham Cox <email@hidden>
- Date: Thu, 30 Jun 2016 12:38:32 +1000
Hi all,
Got a problem with variadic arguments.
I have a function thus:
void XVLogEvent( NSString* format, ... )
{
NSString* logString;
va_list argsP;
va_start( argsP, format );
logString = [NSString stringWithFormat:format, argsP];
va_end(argsP);
XVEventLog* logger = [XVEventLog sharedEventLog];
[logger appendLog:logString];
}
This function is invoked by a macro so I can easily deploy a special type of logging. The problem I have is with the line:
logString = [NSString stringWithFormat:format, argsP];
which causes an EXC_BAD_ACCESS. Obviously I’m doing it wrong, but if I use NSLogv here, it works fine. How do I turn my variadic parameters into a fully formatted string?
—Graham
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