Where is Logfile stored using cocoaLumberjack

Send log files from app through email, in Objective-C

Objective-C code:

In you header:

#import <MessageUI/MessageUI.h>
#import "DDLog.h"
#import "DDFileLogger.h"

In your implementation:

- (NSMutableArray *)errorLogData {
    DDFileLogger *ddFileLogger = [DDFileLogger new];
    NSArray <NSString *> *logFilePaths = [ddFileLogger.logFileManager sortedLogFilePaths];
    NSMutableArray <NSData *> *logFileDataArray = [NSMutableArray new];
    for (NSString* logFilePath in logFilePaths) {
        NSURL *fileUrl = [NSURL fileURLWithPath:logFilePath];
        NSData *logFileData = [NSData dataWithContentsOfURL:fileUrl options:NSDataReadingMappedIfSafe error:nil];
        if (logFileData) {
            [logFileDataArray insertObject:logFileData atIndex:0];
        }
    }
    return logFileDataArray;
}

- (void)composeEmailWithDebugAttachment {
    if ([MFMailComposeViewController canSendMail]) {

        MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
        mailViewController.mailComposeDelegate = self;
        NSMutableData *errorLogData = [NSMutableData data];
        for (NSData *errorLogFileData in [self errorLogData]) {
            [errorLogData appendData:errorLogFileData];
        }
        [mailViewController addAttachmentData:errorLogData mimeType:@"text/plain" fileName:@"filename.log"];
        [mailViewController setSubject:NSLocalizedString(@"LogFile Subject", @"")];
        [mailViewController setToRecipients:[NSArray arrayWithObject:@"email@email.com"]];

        [self presentViewController:mailViewController animated:YES completion:nil];

    } else {
        NSString *message = NSLocalizedString(@"Sorry, your issue can't be reported right now. This is most likely because no mail accounts are set up on your mobile device.", @"");
        [[[UIAlertView alloc] initWithTitle:nil message:message delegate:nil cancelButtonTitle:NSLocalizedString(@"OK", @"") otherButtonTitles: nil] show];
    }
}

- (void)mailComposeController:(MFMailComposeViewController *)mailer didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    [self becomeFirstResponder];
    [mailer dismissViewControllerAnimated:YES completion:nil];
}

Here is how you could add something in your Log-file:

DDLogError(@"This is an error.");
DDLogWarn(@"This is a warning.");
DDLogInfo(@"This is just a message.");
DDLogVerbose(@"This is a verbose message.");

Don't forget to set your ddLogLevel in your Constants-file.

Constants.h :

extern NSUInteger const ddLogLevel;

Comstants.m :

NSUInteger const ddLogLevel =
#ifdef DEBUG
LOG_LEVEL_VERBOSE;
#else
LOG_LEVEL_ERROR;
#endif

It is very obvious but don't forget to configure CocoaLumberjack in your AppDelegate.m file.

[DDLog addLogger:[DDASLLogger sharedInstance]];
[DDLog addLogger:[DDTTYLogger sharedInstance]];

DDFileLogger *fileLogger = [[DDFileLogger alloc] init];
[fileLogger setMaximumFileSize:(1024 * 1024)];
[fileLogger setRollingFrequency:(3600.0 * 24.0)];
[[fileLogger logFileManager] setMaximumNumberOfLogFiles:7];
[DDLog addLogger:fileLogger];

The best place to paste this code is - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions; in your AppDelegate.m file. Also you should add this line of code in your AppDelegate.m header:

#import <CocoaLumberjack/CocoaLumberjack.h>

Hope it will help.

I had to rewrite it a little to be compatible with Swift 4...

var logFileDataArray: [Data] {
    let logFilePaths = delegate.fileLogger.logFileManager.sortedLogFilePaths
    var logFileDataArray = [Data]()
    for logFilePath in logFilePaths {
        let fileURL = URL(fileURLWithPath: logFilePath)
        if let logFileData =
            try? Data(contentsOf: fileURL, options: Data.ReadingOptions.mappedIfSafe) {
            logFileDataArray.insert(logFileData, at: 0)
        }
    }
    return logFileDataArray
}

func sendApplicationLog(text: String) {
    if MFMailComposeViewController.canSendMail() {
        let controller = MFMailComposeViewController()
        controller.mailComposeDelegate = self
        controller.setToRecipients(["dohan.rene@gmail.com"])
        controller.setSubject("Log of motorkari iOS")
        controller.setMessageBody(text, isHTML: false)
        var attachmentData = Data()
        for logFileData in logFileDataArray { attachmentData.append(logFileData) }
        controller.addAttachmentData(attachmentData, mimeType: "text/plain",
                                    fileName: "motorkari_ios_application.log")
        present(controller, animated: true, completion: nil)
    } else {
        showMessage("Log cannot be send !")
    }
}

I don't know if this might help somebody else... I took the previous answers and passed it to Swift 5. Apart from getting all the paths, it prints the content.

let logFileLogger = DDFileLogger()
print(logFileLogger.logFileManager.logsDirectory)

for path in logFileLogger.logFileManager.sortedLogFilePaths {
    do {
        let content = try String(contentsOfFile: path, encoding: .utf8)
        print(content)
    } catch let error as NSError {
        print("Error: \(error.localizedDescription)")
    }
}