Input Parameters | Significance |
DtvLong idm | mask Id |
MAS_FNC_LAY_LNR fnc | pointer to the mask-listener function |
Output Parameters | Significance |
none | - |
Return Code | Significance |
0 | all OK |
1 | old mask-listener function was overwritten |
-1 | no mask Id passed |
With the help of the mask-listener callback function you can react on changes to the local mask structure. The mask-listener function is automatically invoked by all functions that change masks, such as dal_mas_ins_fld.
The mask-listener function must correspond to the specification void fnc(idm, typ, fnc_nam). The parameters are:
If the same listener function is used for all objects (menus, button areas, masks), the enumeration type DTV_LAY_LNR_TYP can be used to determine from which object the listener function was called.