A function which is passed as a parameter to a HEX API function and called when the data requested with that function arrives.
A process for invoking a method or a desktop command, or for using the gadget library in an application; the means by which dialogs and gadgets respond to user input. For example, when an administrator makes a selection with the mouse, some action is initiated from the user interface to an underlying object representing some system resource or component; that is, the user interface "calls back" to the object to invoke some method or series of methods.
A routine whose address is passed to a library or operating system function, so the callback routine may subsequently be â€œcalled backâ€ in response to some event. Callbacks are used with SmartHeap to handle memory-related error conditions.
(noun) - A function or a member function which will be called when a signal is emitted. A slot specifies the callback and any extra data, such as the object instance, and extra parameters.
a C function provided as a parameter to an asynchronous Globus function that is invoked after the call of the function
a code reentrypoint passed to the function so that the function can invoke routines in the caller as a part of its operation
a function or procedure that is executed when an event or combination of events occurs
a function supplied by you that can do anything you want
a function that an application registers with the system
a function that executes when a specific event occurs on a graphics object
a function that's registered at run time with a data structure or object
a function that will be called when a specific event happens
a function that you write and associate with a specific GUI component or with the GUI figure
a function to be invoked by OpenGLUT when OpenGLUT processes a suitable event
a function you write and tell Windows to call for some reason
a global function that operates on no particular object and has all the necessary parameters passed to it
a mechanism by which the user's action on a software application's graphical user interface (GUI) is connected to the code implementing the application's response to this action
a mechanism through which an application is notified of events outside the application
a method which notifies the Client object that a gadget's state has changed, specifically as the result of an interaction by the user (for example pressing a push-button or dragging a slider)
an event generated by external code, such as an Xtra, or Director itself with a predetermined name that you set up a handler to catch and process
a pointer to a function, so if you want a processing function
a promise by the server that it will notify allowing any other client to modify the object
a situation where you'd like to pass a reference to some behavior and have another object invoke it later
a sort of a connection between an event of a window and a method of a destination object
a subroutine that is called when a particular event occurs
a way in which a program can register for notification when certain events occur
A way for one thread to notify another application thread that an event has happened.
A field of a widget structure that designates a list of callback functions and a user action. When the user action occurs on that widget, the functions on the callback list are executed.
A function that informs an application that one of its gadgets has been used.
callback function or a callback resource.
A mechanism by which a function is provided with another function as one of its parameters to call when it is used. It allows us to tailor the behavior of a function at the point of use rather than at the point of definition. The various line-drawing functions that are part of my library and declared in line_drawing.h are examples of using a callback. Their last parameter determines what is to be done at each "point" of the line.
A programmatic technique in which one process starts another and then continues. The second process then calls the first as a result of an action, value, or other event. This technique is used in most programs that have a user interface to allow continuous interaction.
A callback is a function or method that is invoked whenever a predetermined condition is met. Signal handlers, particularly, are frequently referred to as 'callbacks'. See also: Signal handler.
An object of class Callback stores a reference to an object and the name of a method implemented by that object. When the Callback object is sent the "invoke" message, it executes the named method in the object it has stored. One use of Callback objects is to handle GUI event processing. For example, the Phonebook GUIController has an Add method for adding new records. A Callback to this method in GUIController is attached to the pushbutton object for Add, and whenever the pushbutton is clicked it invokes this Callback.
A programmer specified routine that can be registered with GLUT to be called in response to a specific type of event. Also used to refer to a specific callback routine being called.
The process by which the access card initiates a call from the receiver to report any IPPV events viewed by the customer, normally scheduled on a monthly basis or when a specified callback threshold (dollar limit or number of events) is reached. An 800 number is used to avoid charging customers.
In computer science, a callback is executable code that is passed as a parameter to other code. It allows a low level software layer to call a function occurring in a higher level layer. Usually the higher level code first calls a function within the lower level code passing to it a pointer or handle to another function. Then the lower level function in the course of executing may call the passed-in function any number of times to perform some subtask. Another option is that the lower level function registers the passed-in function as a handler that is to be called asynchronously by the lower level at a later time in reaction to something.
A code reference that is passed to a library so that it may be called when something has occurred. The library calls the main program back, rather than returning something. Callbacks are useful in event driven programs since they often provide a form of concurrency. The main program can continue on, eventually receiving notification via callback that some background task has finished. see: event driven program, postback
A behavior that is defined by one object and then later invoked by another object when a particular event occurs.
A function which should be called when something happens. This function is registered ahead of time. The use of callbacks makes event-driven programming much more simple and robust.
In computer programming, a callback is executable code that is passed as an argument to other code. It allows a lower-level software layer to call a function defined in a higher-level layer.