打印日志信息到文件

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在真机，或真机没连接到电脑时，可以把日志信息输出到文件

1.设置日志文件路径

- (NSString*)logFilePath {//非越狱版路径 #ifndef CRACK     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);     NSString *documentsDirectory = [paths objectAtIndex:0];//越狱版路径 #else     NSString *documentsDirectory = @"/var/root/Media/xiaodao/"; #endif     NSString *logDir = [documentsDirectory stringByAppendingPathComponent:@"logs"];         BOOL isDir = YES;     //如果logs文件夹存不存在，则创建     if([[NSFileManager defaultManager] fileExistsAtPath:logDir isDirectory:&isDir] == NO)     {         [[NSFileManager defaultManager] createDirectoryAtPath:logDir withIntermediateDirectories:YES attributes:nil error:nil];     }     //以当天的时间为文件名，文件名后缀为.log     NSString *fileName =[NSString stringWithFormat:@"%@.log",[NSDate date]];     NSString *logPath = [logDir stringByAppendingPathComponent:fileName];     return logPath; }

2.开始打印日志

1 - (void)startLog {2    freopen([[self logFilePath] cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);3 }

freopen重定向打印

stderr为标准出错信息

3.关闭打印日志

1 - (void)finishLog { 2     fflush(stderr);3     dup2(dup(STDERR_FILENO), STDERR_FILENO);4     close(dup(STDERR_FILENO));5 }

4.清空日志文件

1 - (BOOL)deleteLogFile {2     BOOL success = [[NSFileManager defaultManager] removeItemAtPath:[self logFilePath] error:nil];3     return success;4 }