Associates a name with an interface element.
Ihandle *IupSetHandle(const char *name, Ihandle *ih); [in C] iup.SetHandle(name: string, ih: ihandle) -> old_ih: ihandle [in Lua]
name: name of the interface element.
ih: identifier of the interface element. Use NULL to remove the association.
Returns: the identifier of the interface element previously associated to the parameter name.
This function is used so it is possible to set attributes values that are in fact other elements that were created in C. For example:
IupSetHandle("test_image", image);
IupSetAttribute(button, "IMAGE", "test_image");
But this code can be replaced by a more convenient function call:
IupSetAttributeHandle(button, "IMAGE", image);
In Lua this is not necessary, you can simply do:
button.image = image
that the association will be automatically made.
In fact, any pointer can be stored and retrieved with IupSetHandle and IupGetHandle, not only Ihandle*.
Also IupSetHandle can be called several times with the same pointer and different names. There is no restriction for the number of names a pointer can have, but IupGetName will return only the last name set.
When IupSetHandle is called, the control will have a HANDLENAME attribute with the last name set. (since 3.17)