How to choose a picture from photo library on iPhone ?

Question

Hi guys,
I am trying to upload a picture in "Photos"(I mean phone photos library) from the app. Actually I don't know how to code it.
Can you suggest me for this issue ?
Thanks in advance.

Answer 1

Hi Raiden -
RaidenMAC wrote:
I am trying to upload a picture in "Photos"(I mean phone photos library) from the app.
Well this is a 3-part project:
1) To allow the user to select a photo from the iPhone library, create an instance of [UIImagePickerController|http://developer.apple.com/library/ios/#documentation/ UIKit/Reference/UIImagePickerControllerClass/UIImagePickerController/UIImagePickerController.html%23//appleref/doc/uid/TP40007070]:
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
[picker release];
2) To get the data from the selected photo, implement [imagePickerController:didFinishPickingMediaWithInfo:|http://developer.apple.co m/library/ios/documentation/UIKit/Reference/UIImagePickerControllerDelegateProtocol/UIImagePickerControllerDelegate/UIImagePickerControllerDelegate.html#// appleref/doc/uid/TP40007069-CH3-SW8] in the picker controller's delegate:
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage* image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSData *jpegData = UIImageJPEGRepresentation (image, 1.0);
// dismiss controller and start upload here
3) Upload the jpeg data. Of course the details will depend on the site (E.g. see [ObjC - Post a UIImage by using NSData and NSURLRequest?|http://stackoverflow.com/questions/743903/objc-post-a-uiimage-by- using-nsdata-and-nsurlrequest]).
If you've never uploaded image data or an image file to a web site, step 3 is going to be the hardest, and in that case I would rcommend another thread with a title like "How to upload image to URL". Hopefully that will get the attention of programmers who have more experience with that topic than I do. Anyway it's an entirely different subject than you've described in the title of this thread.
Even if you have experience uploading data, I would recommend working on steps 1 and 2 first. You could check your work by adding these lines to the delegate example above:
BOOL result = [jpegData writeToFile:@"/Users/Raiden/Picture.jpeg" atomically:NO];
NSLog(@"jpegData=%@ result=%d", jpegData, result);
Once you get the desired picture into your test file, you can work on the upload, confident that your source data is correct.
- Ray