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Get data associated with a control surface
void *PtSurfaceGetData( PtWidget_t *widget,
PtSurface_t *surface );
void *PtSurfaceGetDataById( PtWidget_t *widget,
unsigned char surface_id );
ph
These functions retrieve the user data stored with a control surface
belonging to the given widget.
They differ in the way they identify the control surface:
- PtSurfaceGetData()
- Uses the surface argument, which points to a
PtSurface_t structure that describes the control surface.
This pointer must not be NULL.
- PtSurfaceGetDataById()
- Searches the control surfaces belonging to the widget for the one
with an ID of surface_id.
A pointer to the data, or NULL if either the specified surface
couldn't be found, or it doesn't have any data attached to it.
Photon
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
PtSurfaceAddData(),
PtSurfaceAddDataById(),
PtSurfaceRemoveData(),
PtSurfaceRemoveDataById()
Control Surfaces
chapter of the Photon Programmer's Guide
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