Question

我想从包名中获取一个图标。包名称通过套接字传递给我。我正在获取包名称并尝试使用它来获取图标，但它正在抛出异常。我从来没有得到图标的print语句。有什么想法吗？

require 'aws-sdk'
require 'json'

client = Aws::EC2::Client.new

instances = ['i-instanceone', 'i-instancetwo']

volumes = client.describe_volumes({ 
  filters: [{
     name: 'attachment.instance-id',
     values: instances
  }]
}).volumes

list = volumes.flat_map(&:attachments).each_with_object(Hash.new {|k,v| k[v] = {}}) do |vol, hsh|
  hsh[vol.instance_id][vol.volume_id] = {
    device: vol.device,
    attach_time: vol.attach_time
  }
end

puts JSON.pretty_generate(list)

# {
#   "i-instanceone": {
#     "vol-one": {
#       "device": "/dev/sda1",
#       "attach_time": "2015-02-25 14:24:23 UTC"
#     }
#   },
#   "i-instancetwo": {
#     "vol-two": {
#       "device": "/dev/sda1",
#       "attach_time": "2015-04-27 13:08:14 UTC"
#     },
#     "vol-three": {
#       "device": "/dev/xvdf",
#       "attach_time": "2016-04-10 14:45:15 UTC"
#     }
#   }
# }

抛出的异常是这样的：现在我的例外，当我想要＆＃34; Iso Mounter＆＃34;的图标时app，是：

           try  {

              Socket socket = new Socket("192.170.10.15", 5050);


              DataInputStream DIS = new DataInputStream(socket.getInputStream());


              String packagename = DIS.readUTF();
              System.out.println("package name" + packagename);


              Drawable icon = getPackageManager().getApplicationIcon(packagename);
              System.out.println("icon" + icon);


              socket.close();


           } catch (Exception e) {
              System.out.println("Did not receive string");
           }

尝试从包名称获取图标时抛出异常

0 个答案: