macOS Making a log file in Xcode Application

[arjit]

I am trying to make log file in for my application now when the program starts i need the file to deleted if it exits and appened in many times in the program how to solve this i FSCreateFileUnicode this but its not working.

any help would be appreciated thanks

 

[Catfish_Man]

Why not use the system log via CFLog() or Apple System Logger (http://developer.apple.com/mac/library/DOCUMENTATION/Darwin/Reference/ManPages/man3/asl.3.html)?

 

[chown33]

I am trying to make log file in for my application now when the program starts i need the file to deleted if it exits and appened in many times in the program how to solve this i FSCreateFileUnicode this but its not working.

What error does FSCreateFileUnicode return when it doesn't work?

 

[arjit]

What error does FSCreateFileUnicode return when it doesn't work?

Actually it shows dup error whcih shows the file exits ... so there is function which could create the file when the program starts and keeps on appending it .

thanks in advnace

 

[chown33]

That doesn't make sense.

If the file exists, then there's no need to create it. Simply open it for writing and append your data.

If the file doesn't exist, then create it before opening it.

There are functions for opening existing files for writing. Read the FileManager docs. Look for FSOpenFork.

http://developer.apple.com/mac/libr...ference/File_Manager/Reference/reference.html

You can also use the C standard I/O function fopen(), and it will handle creation, appending, etc. when given the right parameters.

 

[kainjow]

Why not use the system log via CFLog()

Isn't CFLog private though?

 

[Catfish_Man]

err, s/CFLog/NSLog then.