异常日志记录 DDLog

来源：互联网发布：单身恋恋软件编辑：程序博客网时间：2024/05/17 21:59

项目中如果想把异常捕获再写入文件，有个十分容易使用的库DDLog.

首先导入库，在git上下载。

一：在项目初始化指定全局LogLeve ,一般在xxxapp.m中

staticconstint ddLogLevel = LOG_LEVEL_VERBOSE;

二：

 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification{    NSExceptionHandler *exceptionHandler = [NSExceptionHandler defaultExceptionHandler] ;    exceptionHandler.delegate = self;    exceptionHandler.exceptionHandlingMask = NSLogAndHandleEveryExceptionMask;        DBSDDFileLogger *fileLogger = [[DBSDDFileLogger alloc] init];    fileLogger.maximumFileSize = 1;  //  1024*1 KB    fileLogger.rollingFrequency = 1;       // 60*60*60 Seconds    fileLogger.logFileManager.maximumNumberOfLogFiles = 4;    [DDLog addLogger:fileLogger];}

- (BOOL)exceptionHandler:(NSExceptionHandler *)sender shouldLogException:(NSException *)exception mask:(unsigned int)mask{    [self printStackTrace:exception];    return YES;}

- (void)printStackTrace:(NSException *)e//要写入log文件的信息{    NSString *stack = [[e userInfo] objectForKey:NSStackTraceKey];    NSMutableArray *args = [NSMutableArray arrayWithCapacity:20];    if (stack) {        NSTask *ls = [[NSTask alloc] init];        NSString *pid = [[NSNumber numberWithInt:[[NSProcessInfo processInfo] processIdentifier]] stringValue];        [args addObject:@"-p"];//-p        [args addObject:pid];        [args addObjectsFromArray:[stack componentsSeparatedByString:@"  "]];        // Note: function addresses are separated by double spaces, not a single space.        [ls setLaunchPath:@"/usr/bin/atos"];//xcrun atos        [ls setArguments:args];       // [ls launch];        NSPipe *pipe;        pipe = [NSPipe pipe];        [ls setStandardOutput: pipe];        NSFileHandle *file;        file = [pipe fileHandleForReading];        [ls launch];        NSData *data;        data = [file readDataToEndOfFile];        NSString *string;        string = [[NSString alloc] initWithData: data                                       encoding: NSUTF8StringEncoding];        NSString *strFormat = [NSString stringWithFormat:@"\n\n*************************exception begin\nexception time: %@\n%@\n*************************exception end\n\n",[NSDate date] ,string];        DDLogCError(strFormat);    } else {        DDLogCError(@"No stack trace available.");    }}

三。两个自定义类。这里的DBSDDFileLogger继承于DDFileLogger,目的在于自定义log文件的路径。如下：

#import "DBSDDFileLogger.h"#import "DBSDDLogFileManagerDefault.h"#define DBSLogDir @"DBstudio/Files/Logs"@implementation DBSDDFileLogger- (id)init{    DBSDDLogFileManagerDefault *defaultLogFileManager = [[DBSDDLogFileManagerDefault alloc] initWithLogsDirectory:[self getDBSCacheLogsDir]];    return [self initWithLogFileManager:defaultLogFileManager];}- (NSString*)getDBSCacheLogsDir{    NSString *dir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)objectAtIndex:0];    NSString *cachedLogDir=[dir stringByAppendingPathComponent:DBSLogDir];    return cachedLogDir;}

DBSDDLogFileManagerDefault 继承自 DDLogFileManagerDefault 目的在于自定义log文件的路径

@implementation DBSDDLogFileManagerDefault- (NSString *)generateShortUUID{    NSDate *date = [[NSDate alloc] init];    NSDateFormatter *threadUnsafeDateFormatter = [[NSDateFormatter alloc] init];    [threadUnsafeDateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];    NSString *dateFormatString = @"yyyy-MM-dd";    [threadUnsafeDateFormatter setDateFormat:dateFormatString];    NSString *filename = [threadUnsafeDateFormatter stringFromDate:date];    return filename;}- (NSString *)createNewLogFile{    NSString *logsDirectory = [self logsDirectory];    int index = 1;    NSString *fileName = [NSString stringWithFormat:@"dbs-log-%@.txt", [self generateShortUUID]];    do    {        NSString *filePath = [logsDirectory stringByAppendingPathComponent:fileName];                if (![[NSFileManager defaultManager] fileExistsAtPath:filePath])        {            [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];            // Since we just created a new log file, we may need to delete some old log files            [super deleteOldLogFiles];            NSLog(@"create file:%@",fileName);            return filePath;        }        else        {            NSString *strFile = [filePath stringByDeletingPathExtension];            NSString *strFileName = [strFile lastPathComponent];            NSString *strFileNameFormat = [self isContainCharacter:strFileName];            if (strFileNameFormat) {                strFileName = strFileNameFormat;            }            fileName =[NSString stringWithFormat:@"%@(%d).%@",strFileName,index,[filePath pathExtension]];            index++;        }    } while(YES);}- (NSString*)isContainCharacter:(NSString*)fileName{    NSString *strCharachter = @"(";    NSRange foundPer=[fileName rangeOfString:strCharachter options:NSCaseInsensitiveSearch];    if(foundPer.length>0) {        NSRange rang;        rang.location = 0;        rang.length = foundPer.location;        NSString *strRes = [fileName substringWithRange:rang];        return strRes;    }    else {        return nil;    }}- (BOOL)isLogFile:(NSString *)fileName{    if (fileName && [fileName length]>3) {        NSRange rang;        rang.location = [fileName length] - 4;        rang.length = 4;        NSString *strTmpName = [fileName substringWithRange:rang];        if ([strTmpName isEqualToString:@".txt"]) {            rang.location = 0;            rang.length = 4;            strTmpName = [fileName substringWithRange:rang];            if ([@"dbs-" isEqualToString:strTmpName]) {                return YES;            }        }    }    return NO;}

好了，test一下

- (IBAction)test:(id)sender {    //@try {        NSMutableArray *array = [NSMutableArray array];        [array addObject:nil];    //}    //@catch (NSException *exception) {        //@throw exception;    //}    //@finally {            //}}

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