Hide the usage of `rb_io_t` where possible. (#7880)

This retries the compatible parts of the previously reverted PR so we can continue to update related code without breaking backwards compatibility.

1 files changed, 1 insertions, 4 deletions

diff --git a/win32/win32.c b/win32/win32.c
index ec65f5383b..c2d12a79f4 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -8269,10 +8269,7 @@ w32_io_info(VALUE *file, w32_io_info_t *st)
 
     tmp = rb_check_convert_type_with_id(*file, T_FILE, "IO", idTo_io);
     if (!NIL_P(tmp)) {
-        rb_io_t *fptr;
-
-        GetOpenFile(tmp, fptr);
-        f = (HANDLE)rb_w32_get_osfhandle(fptr->fd);
+        f = (HANDLE)rb_w32_get_osfhandle(rb_io_descriptor(tmp));
         if (f == (HANDLE)-1) return INVALID_HANDLE_VALUE;
     }
     else {