2011年8月アーカイブ

１、Frameworkを追加
#import <AssetsLibrary/AssetsLibrary.h>
#import <ImageIO/ImageIO.h>

２、サンプルコード
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {

    [picker dismissModalViewControllerAnimated:NO];

    // カメラロールからiPhoneカメラで撮った場合、GPSなど取得可能
    NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];
    ALAssetsLibrary *lib = [[[ALAssetsLibrary alloc] init] autorelease];
    NSLog(@">>>>>> %@", url);
   
    [lib assetForURL:url
        resultBlock:^(ALAsset *asset){
            ALAssetRepresentation *representation = [asset defaultRepresentation];
            NSUInteger size = [representation size];
            uint8_t *buff = (uint8_t *)malloc(sizeof(uint8_t)*size);
            if(buff != nil){
                NSError *error = nil;
                NSUInteger bytesRead = [representation getBytes:buff fromOffset:0 length:size error:&error];
                if (bytesRead && !error) {
                    NSData *photo = [NSData dataWithBytesNoCopy:buff length:bytesRead freeWhenDone:YES];


                    CGImageSourceRef cgImage = CGImageSourceCreateWithData((CFDataRef)photo, nil);
                    NSMutableDictionary *imageMetadata = (NSMutableDictionary *)CGImageSourceCopyPropertiesAtIndex(cgImage, 0, nil);
                    if (imageMetadata) {
                        NSLog(@"%@", [imageMetadata description]);
                       // GPSはこんなかんじで取得
                        if ([imageMetadata valueForKey:@"{GPS}"]) {
                              CLLocationDegrees lat = (CLLocationDegrees)[[[imageMetadata objectForKey:@"{GPS}"] objectForKey:@"Latitude"] doubleValue];
                              CLLocationDegrees lng = (CLLocationDegrees)[[[imageMetadata objectForKey:@"{GPS}"] objectForKey:@"Longitude"] doubleValue];
                        }

                    } else {
                        NSLog(@"no metadata");
                    }
                    CFRelease(cgImage);
                }
                if (error) {
                    NSLog(@"error:%@", error);
                    [error release];
                    free(buff);
                }
            }
        }
        failureBlock:^(NSError *error){
                 NSLog(@"error:%@", error);
             }];

}