iOS Design Patterns 1/2

iOS Design Patterns – you’ve probably heard the term, but do you know what it means? While most developers probably agree that design patterns are very important, there aren’t many articles on the subject and we developers sometimes don’t pay too much attention to design patterns while writing code.

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how to check file is updated or not without using modified time

how to check file is updated or not without using modified time  in cocoa for mac-osx objective-c

How to get checkSum of a file........

#import "NSData+MD5.h"

@interface NSData(MD5)

 - (NSString *)MD5;

@end

#import <CommonCrypto/CommonDigest.h>

 @implementation NSData(MD5)

- (NSString*)MD5

{

  // Create byte array of unsigned chars

  unsigned char md5Buffer[CC_MD5_DIGEST_LENGTH];

// Create 16 byte MD5 hash value, store in buffer

  CC_MD5(self.bytes, self.length, md5Buffer);

    

// Convert unsigned char buffer to NSString of hex values

  NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];

  for(int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) 

[output appendFormat:@"%02x",md5Buffer[i]];

  return output;

}

@end

Call from Own class: 

+(NSString *)getCheckSum:(NSString *)filePath{

     NSData *nsData = [NSData dataWithContentsOfFile:filePath];

     if (nsData){

         return [nsData MD5];

     }

    else{

         return nil;

     }

}

How to check file is open or close objective-c in MAC os-x

How to check file is open or close in cocoa for mac osx (objective -c)

                 NSTask *task = [[NSTask alloc] init];

                    [task setLaunchPath:@"/bin/bash"];

                    [task setArguments:@[ @"-c",  [NSString stringWithFormat:@"lsof %@",FILE_PATH]];

                    [task launch];

                    [task waitUntilExit];

                    int status = [task terminationStatus];

                    if(status==0 ){

                      //file is open

                    }

                    if(status==1){

                       //file is closed  

                        }

                    }

                    task=nil;

Call method after every 1 sec. in Background thread

First time call through:

//call from viewdidload

dispatch_queue_t q_background = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0);

    dispatch_async(q_background, ^{

        [self checkFileOpenOrNot:nil];

   });

-(void) checkFileOpenOrNot:(id)sender{

//do your code 

dispatch_queue_t q_background = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0);

            double delayInSeconds = 1.0;

            dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);

            dispatch_after(popTime, q_background, ^(void){

                [self checkFileOpenOrNot:nil];

            });

}