Cocoa Maker 7 - Libraries and Frameworks

James (MrGeckosMedia.com), joined by, Eduardo (MegaEduX.com), and Nick, explains libraries and frameworks.

11:56

Example code from episode.
Libraries
Libraries included, /usr/lib/libcrypto.dylib and /usr/lib/libssl.dylib

#import <Foundation/Foundation.h>
#import <openssl/evp.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 
 NSString *string = @"Hello";
 
 OpenSSL_add_all_algorithms();
 unsigned char outbuf[EVP_MAX_MD_SIZE];
 unsigned int templen, inlen = [string length];
 const char *input = [string UTF8String];
 EVP_MD_CTX ctx;
 
 const EVP_MD *digest = EVP_md5();
 if(!digest) {
  NSLog(@"cannot get digest with name MD5");
  return 1;
 }
 
 EVP_MD_CTX_init(&ctx);
 EVP_DigestInit(&ctx,digest);
 if(!EVP_DigestUpdate(&ctx,input,inlen)) {
  NSLog(@"EVP_DigestUpdate() failed!");
  EVP_MD_CTX_cleanup(&ctx);
  return 1;   
 }
 if (!EVP_DigestFinal(&ctx, outbuf, &templen)) {
  NSLog(@"EVP_DigesttFinal() failed!");
  EVP_MD_CTX_cleanup(&ctx);
  return 1;
 }
 EVP_MD_CTX_cleanup(&ctx);
 
 NSMutableString *md5 = [NSMutableString string];
 for (int i=0; i<templen; i++) {
  [md5 appendFormat:@"%x", outbuf[i]];
 }
 NSLog(@"MD5 of %@ is %@", string, md5);
 
    [pool drain];
    return 0;
}

Frameworks
Frameworks included, AddressBook.framework

#import <Foundation/Foundation.h>
#import <AddressBook/AddressBook.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 
 ABAddressBook *addressBook = [ABAddressBook sharedAddressBook];
 NSArray *people = [addressBook people];
 for (int i=0; i<[people count]; i++) {
  ABPerson *person = [people objectAtIndex:i];
  NSString *firstName = [person valueForProperty:kABFirstNameProperty];
  NSString *lastName = [person valueForProperty:kABLastNameProperty];
  NSString *name = nil;
  if (firstName!=nil) {
   name = firstName;
   if (lastName!=nil)
    name = [name stringByAppendingFormat:@" %@", lastName];
  }
  if (name!=nil)
   NSLog(@"Person named: %@", name);
 }
 
    [pool drain];
    return 0;
}

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