Picture ring animated control spinning problem

[SriVidya]

Hello,

The picture ring animated control is not spinning for me as expexted.
In my main function after displaying the panel
AnimateCtrl_ConvertFromPictRing (panel, PNL_SPLASH_ANIMATION);
AnimateCtrl_SetAttribute (panel, PNL_SPLASH_ANIMATION,
ATTR_ANIMATE_ENABLED, 1);
AnimateCtrl_SetAttribute (panel, PNL_SPLASH_ANIMATION,
ATTR_ANIMATE_FRAME_INTERVAL, 0.05);
AnimateCtrl_SetAttribute (panel, PNL_SPLASH_ANIMATION, ATTR_ANIMATE_STOP_ON_LAST_FRAME, 0);

ProcessSystemEvents();

ProcessSystemEvents() line it is giving a runtime error

NON-FATAL RUN-TIME ERROR: "test.c", line 137, col 5, thread id 0x00000C38: Library function error (return value == -4 [0xfffffffc]). Panel, pop-up, or menu bar handle is invalid.

Can anyone help me out with this?

[Wolfgang · Accepted solution]

1) The first thing to do is to include error checking. All functions you use provide a return value, but you prefer to ignore it. It's better, i.e. safer to check each function for proper operation. Instead of AnimateCtrl... use

status = AnimateCtrl...

if (status < 0 )...

2) The error returned 'Panel, pop-up, or menu bar handle is invalid' indicates that either panel is not a panel handle or 'PNL_SPLASH_ANIMATION' is not a valid picture ring control. Are these the constant names as defined in the include file of your UIR file?