私のアプリケーションでは、特定の URL リンクから画像をダウンロードし、それを に割り当てる必要がありますUIImageView
。その画像をライブラリに保存しません。この場合、アプリでこの画像の Exif データ( EXIF_TAG_CREATE_DATE
、など) を取得するにはどうすればよいですか?EXIF_TAG_ARTIST
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2 に答える
5
ImageIO を介して、画像の高さと幅、DPI、EXIF データなどの画像プロパティにアクセスする
CFURLRef url = CFURLCreateFromFileSystemRepresentation (kCFAllocatorDefault, (const UInt8 *)inputFileName, strlen(inputFileName), false);
if (!url) {
printf ("* * Bad input file path\n");
}
CGImageSourceRef myImageSource;
myImageSource = CGImageSourceCreateWithURL(url, NULL);
CFDictionaryRef imagePropertiesDictionary;
imagePropertiesDictionary = CGImageSourceCopyPropertiesAtIndex(myImageSource,0, NULL);
CFNumberRef imageWidth = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelWidth);
CFNumberRef imageHeight = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelHeight);
int w = 0;
int h = 0;
CFNumberGetValue(imageWidth, kCFNumberIntType, &w);
CFNumberGetValue(imageHeight, kCFNumberIntType, &h);
CFRelease(imagePropertiesDictionary);
CFRelease(myImageSource);
printf("Image Width: %d\n",w);
printf("Image Height: %d\n",h);
( ソース: http://developer.apple.com/library/ios/#qa/qa1654/_index.html )
NSString *myPath = [[NSBundle mainBundle] pathForResource:@"IMG_2733" ofType:@"JPG"];
NSURL *myURL = [NSURL fileURLWithPath:myPath];
CGImageSourceRef mySourceRef = CGImageSourceCreateWithURL((CFURLRef)myURL, NULL);
NSDictionary *myMetadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(mySourceRef,0,NULL);
NSDictionary *exifDic = [myMetadata objectForKey:(NSString *)kCGImagePropertyExifDictionary];
NSDictionary *tiffDic = [myMetadata objectForKey:(NSString *)kCGImagePropertyTIFFDictionary];
NSLog(@"exifDic properties: %@", myMetadata); //all data
float rawShutterSpeed = [[exifDic objectForKey:(NSString *)kCGImagePropertyExifExposureTime] floatValue];
int decShutterSpeed = (1 / rawShutterSpeed);
NSLog(@"Camera %@",[tiffDic objectForKey:(NSString *)kCGImagePropertyTIFFModel]);
NSLog(@"Focal Length %@mm",[exifDic objectForKey:(NSString *)kCGImagePropertyExifFocalLength]);
NSLog(@"Shutter Speed %@", [NSString stringWithFormat:@"1/%d", decShutterSpeed]);
NSLog(@"Aperture f/%@",[exifDic objectForKey:(NSString *)kCGImagePropertyExifFNumber]);
NSNumber *ExifISOSpeed = [[exifDic objectForKey:(NSString*)kCGImagePropertyExifISOSpeedRatings] objectAtIndex:0];
NSLog(@"ISO %i",[ExifISOSpeed integerValue]);
NSLog(@"Taken %@",[exifDic objectForKey:(NSString*)kCGImagePropertyExifDateTimeDigitized]);
( ソース: http://blog.depicus.com/index.php/2011/05/07/getting-exif-data-from-images-on-ios/ )
オープン ソース (ただし時代遅れ) の iphone-exif ライブラリ経由で EXIF プロパティにアクセスする
NSData* theImageData = UIImageRepresentation(anImage,1.0);
EXFJpeg* jpegScanner = [[EXFJpeg alloc] init];
[jpegScanner scanImageData: theImageData];
EXFMetaData* exifData = jpegScanner.exifMetaData; EXFJFIF* jfif =
jpegScanner.jfif;
id tagValue = [exifData tagValue: aTagId];
于 2013-05-30T08:08:14.790 に答える