/**
* <summary>
* Registers the callback function that is invoked on every change of advertised value.
* <para>
* The callback is invoked only during the execution of <c>ySleep</c> or <c>yHandleEvents</c>.
* This provides control over the time when the callback is triggered. For good responsiveness, remember to call
* one of these two functions periodically. To unregister a callback, pass a null pointer as argument.
* </para>
* <para>
* </para>
* </summary>
* <param name="callback">
* the callback function to call, or a null pointer. The callback function should take two
* arguments: the function object of which the value has changed, and the character string describing
* the new advertised value.
* @noreturn
* </param>
*/
public void registerValueCallback(GenericUpdateCallback callback)
{
if (callback != null)
{
_registerFuncCallback(this);
}
else
{
_unregisterFuncCallback(this);
}
_genCallback = new GenericUpdateCallback(callback);
}
public YFunction(string classname, string func)
{
_className = classname;
_func = func;
_lastErrorType = YAPI.SUCCESS;
_lastErrorMsg = "";
_cacheExpiration = 0;
_fundescr = FUNCTIONDESCRIPTOR_INVALID;
_userData = null;
_genCallback = null;
_FunctionCache.Add(this);
}
