I've followed A lot of the code in this PrintService example repository: Zaki50 PrintService. The only thing I'm trying to do different is to get the bytes from the file associated with PrintJob. Now I have the FileDescriptor, but don't know how to use it to get the actual file data in anyway! Any help would be immensely appreciated.

CodePudding user response：

Ok, Here's the answer in code:

final PrintJobInfo info = printJob.getInfo();
final File file = new File(getFilesDir(), info.getLabel());


InputStream in = null;
FileOutputStream out = null;

try {
   in = new 
   FileInputStream(printJob.getDocument().getData().getFileDescriptor());
   out = new FileOutputStream(file);

   byte[] buffer = new byte[1024];
   int read;
   while ((read = in.read(buffer)) != -1) {
          out.write(buffer, 0, read);
   }
   in.close();

   out.flush();
   out.close();

} catch (IOException ioe) {

}

FileChannel channel = null;
byte[] fileBytes = null;
try {
       RandomAccessFile raf = new RandomAccessFile(file, "r");
       channel = raf.getChannel();
       ByteBuffer bb = ByteBuffer.NEW(channel.map(
             FileChannel.MapMode.READ_ONLY, 0, channel.size()));
       fileBytes  = new byte[bb.remaining()];
       bb.get(fileBytes , 0, fileBytes .length);

} catch (FileNotFoundException e) {
       e.printStackTrace();
} catch (IOException e) {
       e.printStackTrace();
}

The content of the fileBytes array is the actual bytes of the printed file.