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--Copyright: Matra Datavision 1992,1993
-- File: OSD_Error.cdl
-- Created: May 18 1992
-- Author: Stephan GARNAUD (ARM)
-- <sga@sparc4>
class Error from OSD
---Purpose: Management of OSD errors
-- Error handling style example:
--
--
-- try{
-- .
-- .
-- .
-- OSD_Semaphore mysem("KeyName");
-- if (mysem.Failed())
-- switch (mysem.Error()){
-- case 201: mysem.Perror();
-- case 202: cout << "Just a warning";
-- }
-- .
-- .
-- .
-- }
-- catch(Standard_Failure){
-- Handle(Standard_Failure) Occur = Standard_Failure::Caught();
-- .
-- . // Programmer's decision
-- .
--
-- Each method can be error tested with object.Failed().
-- To manage an occuring error, just use object.Perror();
--
-- It is possible to reset the error counter to zero.
-- To do this use the 'Reset' method .
-- Only 4 methods are usable for programmer :
-- Failed to see whether an error occured or not.
-- Value to get system independent error code.
-- (See annexe for a complete list of error code).
-- Reset to reset error code to zero (no error).
-- Perror to raise OSDError and print a self explanatory error
-- message. This message says why an error occurs and
-- explains what to do to correct it.
uses
WhoAmI, AsciiString from TCollection
raises
OSDError
is
Create returns Error;
---Purpose: Initializes Error to be without any Error.
-- This is only used by OSD, not by programmer.
---Level: Public
Perror (me : in out)
---Purpose: Raises OSD_Error with accurate error message.
raises OSDError is static;
---Level: Public
SetValue (me : in out; Errcode : Integer; From : Integer; Message : AsciiString) is static;
---Purpose: Instantiates error
-- This is only used by OSD methods to instantiates an error code.
-- No description is done for the programmer.
---Level: Public
Error (me) returns Integer is static;
---Purpose: Returns an accurate error code.
-- To test these values, you must include "OSD_ErrorList.hxx"
---Level: Public
Failed (me) returns Boolean is static;
---Purpose: Returns TRUE if an error occurs
-- This is a way to test if a system call succeeded or not.
---Level: Public
Reset (me : in out) is static;
---Purpose: Resets error counter to zero
-- This allows the user to ignore an error (WARNING).
---Level: Public
fields
myMessage : AsciiString; -- Internal error message
myErrno : Integer; -- UNIX/VMS error used by OSD only
myCode : WhoAmI; -- Accuracy code in error for OSD only
extCode : Integer; -- Error type decoded for user
end Error from OSD;
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