I want to have a custom log file for my app, so that my client can
send it to me when things go "different".
In reading the docs for NSLog, it seems that it is just a front-end
for asl. So here's what I thought should work:
directories = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSUserDomainMask, YES);
NSString *logFileName = nil;
int result = 0;
if ([directories count] > 0) {
logFileName = [directories objectAtIndex:0];
logFileName = [logFileName stringByAppendingPathComponent:@"Logs"];
if ([fileMgr createDirectoryAtPath:logFileName
withIntermediateDirectories:YES attributes:nil error:nil]) {
logFileName = [logFileName
stringByAppendingPathComponent:@"MyLogFile.log"];
int fd = open([logFileName fileSystemRepresentation], (O_RDWR|
O_CREAT|O_TRUNC), (S_IRWXU|S_IRWXG|S_IRWXO));
if (fd != -1) {
result = asl_add_log_file(NULL, fd);
}
}
}
This results in the file being created, but nothing ever being written
to it. In Console.app, I can see the messages when I select "All
Messages", "Console Messages", and "system.log", but *not*
"MyLogFile.log".
I assume it has something to do with this comment in the docs for
NSLogv (which NSLog calls): "If the STDERR_FILENO file descriptor has
been redirected away from the default or is going to a tty, it will
also be written there. If you want to direct output elsewhere, you
need to use a custom logging facility." This seems contradictory to
the statement that NSLog "Logs an error message to the Apple System
Log facility." If anyone would like to educate me on my obvious
misunderstanding of this, I'd appreciate it.
Anyway, I tried it, and yes, redirecting stderr to my log file does
put all my NSLogs into my log file. But, it also prevents the
messages from being seen in Xcode's Console window.
How can I have my cake and eat it too?
randy
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