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_CBwinTouchPointAdd

Define a callback.

Prototype :

fun [ObjWin fun [ObjWin u0 I I I] u1 u0] ObjWin

• ObjWin : a window


• fun [ObjWin u0 I I I] u1 : a callback. Supplemental arguments are :
  • I : id du point
  • I : x coordinate
  • I : y coordinate


• u0 : an user parameter

Return : ObjWin the same Window object or NIL if an error occurs.

See also :

Example :

Note :