Print log information to a file

When a real machine or a real machine is not connected to a computer, you can output the log information to a file.

1. Set the log file path

 1 -(Nsstring *) logfilepath {
 2   //  Non-Jailbreak path  
  3 # Ifndef Crack
 4 Nsarray * paths = nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, yes );
 5 Nsstring * documentsdirectory = [paths objectatindex: 0 ];
 6  //  Jailbreak path  
  7    # Else 
 8 Nsstring * documentsdirectory = @"  /Var/root/Media/Xiaodao/  " ;
 9    # Endif 
 10 Nsstring * logdir = [documentsdirectory stringbyappendingpathcomponent: @"  Logs " ];
 11 Bool isdir = yes;
 12        //  If the logs Folder does not exist, create  
  13        If ([[Nsfilemanager defaultmanager] fileexistsatpath: logdir isdirectory: & isdir] = No)
 14 {
 15 [[Nsfilemanager defaultmanager] createdirectoryatpath: logdir withintermediatedirectories: Yes attributes: Nil error: Nil];
16 }
 17        //  Take the day as the file name, and the file name suffix is. Log  
  18 Nsstring * filename = [nsstring stringwithformat: @"  % @. Log  " , [Nsdate date];
 19 Nsstring * logpath = [logdir stringbyappendingpathcomponent: Filename];
 20        Return Logpath;
21 }

2. Start printing logs

 
1-(Void) Startlog {
2Freopen ([[self logfilepath] cstringusingencoding: nsasciistringencoding],"A +", Stderr );
3}
 

Freopen redirection Printing

Stderr is the standard error message

3. Disable log printing.

1-(Void) Finishlog {
2Fflush (stderr );
3Dup2 (DUP (stderr_fileno), stderr_fileno );
4Close (DUP (stderr_fileno ));
5}
 

4. Clear log files

 
1-(Bool) deletelogfile {
2Bool success = [[nsfilemanager defaultmanager] removeitematpath: [self logfilepath] error: Nil];
3ReturnSuccess;
4}