vc_dispmanx_update_start and vc_dispmanx_display_open

[axedcode]

Hi, I was just wondering what the correct return value of both of these functions should be. Last week the update function was returning 0 which I thought was correct. Since I've rebooted, and every boot thereafter, it is now returning a really long number, much like the display_open function which has always returned 268435456. What should I be getting as values for these handles?

[MindChild]

These should return an DISPMANX_UPDATE_HANDLE_T and a DISPMANX_DISPLAY_HANDLE_T respectively. 0 is never going to be a valid handle to anything

[dom]

I think dispmanx can return a handle of:
DISPMANX_NO_HANDLE=0
DISPMANX_INVALID=-1

Anything else is a valid handle. Otherwise it is an opaque type (some of the lower bits are an incrementing handle number, and some higher bits contain internal flags).