Object-C with PHP MYSQL

1) NSURLConnection and its delegate methods - you can send asynchronous request to your webserver to get this file and get notified when the data has been downloaded so the user interface is never blocked in your app.

Here's the documentation with some good examples from Apple:http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSURLConnection_Class/Reference/Reference.html

At the end of the download, you will have an NSData object which can then be converted back to a string using NSString *jsonContents = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding.

You can then use a JSON parser library - I recommend SBJSON https://github.com/stig/json-framework- which will parse the data and return it as a dictionary or array depending on your structure.

From there you can access your tables and value with valueForKey in dictionaries orobjectAtIndex: in arrays and then map it into your chosen local storage, for which I recommend Coredata (or you could use sqlite if you are familiar with it too).

Generate a random number and use it as the index. Example:

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        NSArray *array = [NSArray arrayWithObjects: @"one", @"two", @"three", @"four", nil];
        NSUInteger randomNumber;
        int fd = open("/dev/random", O_RDONLY);
        if (fd != -1) {
            read(fd, &randomNumber, sizeof(randomNumber));
            close(fd);
        } else {
            fprintf(stderr, "Unable to open /dev/random: %s\n", strerror(errno));
            return -1;
        }
        double scaledRandomNumber = ((double)randomNumber)/NSUIntegerMax * [array count];
        NSUInteger randomIndex = (NSUInteger)floor(scaledRandomNumber);
        NSLog(@"random element: %@", [array objectAtIndex: randomIndex]);
    }
    return 0;
}




URL GET/POST Request objective-c

I have to send get or post request to localhost:

<?php
 if(@$_GET['option']) {
  echo "You said \"{$_GET['option']}\"";
 }else if(@$_POST['option']) {
  echo "You said \"{$_POST['option']}\"";
 }
?>

ive using this code:

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost/wsh/index.php?option=Hello"]];
 NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
 NSString *get = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];

it works, but one time in code. if ill do it another one time, application has terminate.

Objective C: Merge two images

+ (UIImage*)mergeImage:(UIImage*)first withImage:(UIImage*)second

{

 // get size of the first image

 CGImageRef firstImageRef = first.CGImage;

 CGFloat firstWidth = CGImageGetWidth(firstImageRef);

 CGFloat firstHeight = CGImageGetHeight(firstImageRef);

  

 // get size of the second image

 CGImageRef secondImageRef = second.CGImage;

 CGFloat secondWidth = CGImageGetWidth(secondImageRef);

 CGFloat secondHeight = CGImageGetHeight(secondImageRef);

  

 // build merged size

 CGSize mergedSize = CGSizeMake(MAX(firstWidth, secondWidth), MAX(firstHeight, secondHeight));

  

 // capture image context ref

 UIGraphicsBeginImageContext(mergedSize);

  

 //Draw images onto the context

 [first drawInRect:CGRectMake(0, 0, firstWidth, firstHeight)];

 [second drawInRect:CGRectMake(0, 0, secondWidth, secondHeight)];

  

 // assign context to new UIImage

 UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

  

 // end context

 UIGraphicsEndImageContext();

 

 return newImage;

}