Creating an image thumbnail

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo{

 

// set the image we have chosen to the background of the current view. (OPTIONAL!)

imageView.image  = image;

 

// write the file to the TEMP Directory in the iphone, then when the user has completed

 

 

// selecting their image from the picker, we want to write both the full sized file, and the

 

// thumbnail to the /tmp directory for use later (whatever you want)

 

NSData *pngImage = UIImagePNGRepresentation(image);

 

if([pngImage writeToFile:[NSString stringWithFormat:@"%@/tempImage.png", 

TEMP_FOLDER] atomically:YES]){

 

// now that we have saved our image, lets generate a thumbnail from that image, and

// save that one as well.

 

// lets essentially make a copy of the selected image.

 

 

UIImage *myThumbNail    = [[UIImage alloc] initWithData:pngImage];

 

// begin an image context that will essentially "hold" our new image

 

 

UIGraphicsBeginImageContext(CGSizeMake(60.0,60.0));

 

// now redraw our image in a smaller rectangle.

 

 

[myThumbNail drawInRect:CGRectMake(0.0, 0.0, 60.0, 60.0)];




 

// make a "copy" of the image from the current context

 

UIImage *newImage    = UIGraphicsGetImageFromCurrentImageContext();

 

UIGraphicsEndImageContext();

 

// create a new view to place on our screen (OPTIONAL-- testing)

 

UIImageView *thumbView    = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 60.0, 60.0)];

 

thumbView.image    = newImage;

 

[self.view addSubview:thumbView];

 

// now grab the PNG representation of our image

 

NSData    *thumbData    = UIImagePNGRepresentation(newImage);

 

// now finally we can write our new thumbnail to the tmp directory on the phone.

 

 

if([thumbData writeToFile:[NSString stringWithFormat:@"%@/tempImageThumb.png", TEMP_FOLDER] atomically:YES]){

NSLog(@"thumb written!");

}

 

// close the modal view

 

[picker dismissModalViewControllerAnimated:YES];

 

}else{

 

// there was an error writing the image file to the tmp folder....

 

 

NSLog(@" there was an error writing the file to the temp directory");

   }

}