ReqErr3

Usage

Overview

Some requests to the window server may generate an error. For example, if a window is destroyed while it is being repositioned interactively, the request to place the window in the new position will fail. Normally, errors cause a process to terminate. The ReqErr class is used to handle errors within an application. The base class defines the attributes associated with each error, including a message string describing the error, an integer request code that specifies the kind of call that generated the error, and a id object that was the target of the request. When an error occurs, the attributes of the current request handler are assigned and the handler's Error operation is called.

Public operations

ReqErr* Install()

Use this error handler for subsequent errors and return the previous error handler.

virtual void Error()

Handle a detected error. The default handler is a nop.