I am writing an application which lets the user pick one photograph from a selection. Then I want to save that photograph to their photo roll to a specific name. i.e I always want the photo in the roll to be named the same thing and overwrite previous selections.
UIImage* image = [UIImage imageNamed:[ImageNames objectAtIndex:self.miImage]];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
I can't find anyway to make a copy of the image and assign a new name to it, or specify a target name for UIImageWriteToSavedPhotosAlbum().
Is there any way to do this?
thanks in advance,
Jay
You cannot specify a filename when using UIImageWriteToSavedPhotosAlbum because it saves the image to the Camera Roll (or the Photos Library, if the device does not have a camera). This allows the system to assign it a name based on a format, like "DSC0001.jpg" or similar, and avoid name collisions.
Because of this, overwriting an image is also not possible, since the Photo Library / Camera Roll are controlled by the user - a user that would not appreciate a photo being overwritten by your application.
...writing the image to the user’s Camera Roll or Saved Photos album.
UIImageWriteToSavedPhotosAlbum Reference
Related
i'm developing an iPhone application that let users to take photos. Those photos are saved inside the application, but i would like also to save them to the camera roll.
The problem is that my application does not have a UI control that let the user specify if he wants the photo to be saved also in the camera roll.
I searched the Apple guidelines and documentation but could not find any hint regarding this issue.
So in your experience is ok to save photos taken by the user also in the camera roll without asking his permission?
It is perfectly fine to write to camera roll without permission..but it is better to show a successful save alert once you save photo.. user won't be happy if you are saving unnecessary/involuntary photo without some feedback to user
void UIImageWriteToSavedPhotosAlbum (
UIImage *image,
id completionTarget,
SEL completionSelector,
void *contextInfo
);
above is the method to save the image .. it can be find in apple docs here Save to camera roll
If the user is taking the photo himself by tapping a button or whatever, saving to the camera roll is the best you could do, IMO, and I don't think you need to show an alert or whichever kind of notice.
The only thing, make sure the user knows where he should go to retrieve his pictures...
I am using ALAssetsLibrary to make an array of all images in the camera roll when my iPhone app starts. I store every image as a ALAsset * in an array.
Later in the app, I am saving an image to the gallery using this:
UIImageWriteToSavedPhotosAlbum(croppedImage, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
The image is saved successfully to the saved photos album. But, now my problem is that when I try to retrieve images using the existing array of all images, I don't get anything. Do I need to build the array of all images again or is there some other way to do this?
Saving an image changes the library and invalidates objects like assets from the library. You need to reload assets from the library whenever the library changes - do that when you receive an ALAssetsLibraryChangedNotification.
I want to create application, that will process images(mostly - photographs from mobile camera).
So i need at first to provide the way to open image file from phone memory.
how can i do that?
Sorry for such a stupid question, but i am newbie in iphone programming(yet:)).
P.S. I use xcode, cocoa
You can use UIImagePickerController to get a standard interface for selecting a photo from the user's library or camera roll. Depending on the configuration, it can also be used to capture a new image with the camera. Note however that you get a UIImage back, not a file, if you want to upload it somewhere, you will first have to create a file or NSData object from the image, using either UIImagePNGRepresentation() or UIImageJPEGRepresentation().
Is there any way to create an array or something
having paths of all the images stored in camera roll.
Please enlighten me on this.
Thnx in advance
SpyPhone uses a direct path to the users photo library:
http://github.com/nst/spyphone/
It seems that any application can read it. However, this seems like falls under the area of "undocumented API" and could well be rejected in a real application.
I don't think there is. As far as the API is concerned for the UIImagePickerController you can only get a single path for a Movie that was recorded by the user (if running 3.0 on a 3GS). And even that path is a file URL to the temporary folder where the movie is stored before being written to the library.
You can't get paths for any images in the photo library or the camera roll.
When you pick an image using the UIImagePickerController the controller returns the Original Image and an "Edited Image" if the image was edited before being chosen.
I am trying to save a photo taken from my app to camera roll, this can be done by using UIImageWriteToSavedPhotosAlbum, however, I noticed there isn't any way to set the photo name by using this approach, am I right?
I also tried to save a image file with a name by using UIImageJPEGRepresentation, however, I can only save it to my app's document folder but not camera roll.
Is there any way to save photo to camera roll with a custom name?
Thanks advance for your kindly help.
John
no, no way to save with a custom name to the camera roll.
There is a way to kinda do that, by setting the image metadata:
if you set the IPTC metadata field "Object Name", this will be shown as the image title in iPhoto.
See details (and code) at http://ootips.org/yonat/how-to-set-the-image-name-when-saving-to-the-camera-roll/ .