[libhid-discuss] Parsing hid_dump_tree()

[comicinker]

Hi 

Can somebody give me a hint where I can start when I want to parse the
hid_dump_tree()?

The thing is: I want to access specific data from a HID device, for
example the X and Y coordinates. If I use a mouse from Cordless Desktop
the important information looks like that:

   [...]
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00000000; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00010030; type: 0x80
  path: 0x00010002.0x00010002.0x00010001.0x00010031; type: 0x80
   [...]


So to access my X and Y value I need the address:

unsigned char const PATHLEN = 4;
int const PATH_OUT[] = { 0x00010002, 0x00010002, 0x00010001, \
	0x00010031 };


(I set set manually in my prog!)

From another, cheaper mouse, the hid_dump_tree() looks like that:

   [...]
  path: 0x00010001.0x00010030; type: 0x80
  path: 0x00010001.0x00010031; type: 0x80
//(or kinda)
   [...]

Much shorter! But how can I directly generate my PATH_OUT[] from it? Do
I have to dive into hid_dump_tree()?

AND: How can I get the RECV_PACKET_LEN for this address automatically?
Or is it always the same length for each address (6)? The test_libhid.c
doesn't tell where this value is detected. 

Bests,

comicinker


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