How to Read value:"SW-Current sheet(current sheet)"

Dear all

In my Drawing Title (show above),exist note "DWG NO",

Which link to file custompropety    \$PRP:"DWg NO" \$PRP:"SW-Current Sheet(Current Sheet)"

The value of Dwg No is "WR02-165-" , while the value of "SW-Current(current sheet)" is "2"

So I can get "DWG NO" "WR02-165-2"

Now I want to read the value "WR02-165-2",Use APi, How do I do?

Or How can I read the value of ""SW-current sheet(current sheet)", ?? If I can

get value of "SW-current sheet", I can also get DWG NO "WR02-165-2"

Thank You

SolidworksApi macros