我正在使用Java库元数据提取器,无法提取标记 使用下面的getUserCommentDescription方法代码正确描述, 虽然tag.getDescription确实有效:
String exif = "File: " + file;
File jpgFile = new File(file);
Metadata metadata = ImageMetadataReader.readMetadata(jpgFile);
for (Directory directory : metadata.getDirectories()) {
String directoryName = directory.getName();
for (Tag tag : directory.getTags()) {
String tagName = tag.getTagName();
String description = tag.getDescription();
if (tagName.toLowerCase().contains("comment")) {
Log.d("DEBUG", description);
}
exif += "\n " + tagName + ": " + description; //Returns the correct values.
Log.d("DEBUG", directoryName + " " + tagName + " " + description);
}
if (directoryName.equals("Exif IFD0")) {
// create a descriptor
ExifSubIFDDirectory exifDirectory = metadata.getDirectory(ExifSubIFDDirectory.class);
ExifSubIFDDescriptor descriptor = new ExifSubIFDDescriptor(exifDirectory);
Log.d("DEBUG","Comments: " + descriptor.getUserCommentDescription()); //Always null.
}
我在这里错过了什么吗?
答案 0 :(得分:0)
您正在检查目录名Exif IFD0
,然后访问ExifSubIFDDirectory
。
在循环外尝试此代码:
Metadata metadata = ImageMetadataReader.readMetadata(jpgFile);
ExifSubIFDDirectory exifDirectory = metadata.getDirectory(ExifSubIFDDirectory.class);
ExifSubIFDDescriptor descriptor = new ExifSubIFDDescriptor(exifDirectory);
String comment = descriptor.getUserCommentDescription();
如果这返回null
,那么它可能是encoding issue or bug。如果您运行此代码:
byte[] commentBytes =
exifDirectory.getByteArray(ExifSubIFDDirectory.TAG_USER_COMMENT);
数组中有字节吗?
如果是,请在issue tracker中打开一个问题,并提供可用于重现问题的示例图像。您必须授权您提供的任何图像才能在公共领域中使用。