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With AddExitProc, you can assign a procedure that is called when the program ends; even when terminated by a runtime error.
Compared to the simple ExitProc, this has the advantage that you don't have to worry about saving and calling up the old ExitProc, this happens automatically in the background with AddExitProc.
In this example, a file that does not exist is deliberately opened:
program AddExitProc_Example; const MyExitCode = 123; procedure end; begin WriteLn('This is the end'); case ExitCode of 2: begin WriteLn('file not found'); end; MyExitCode: begin WriteLn('It was deliberately terminated with ', MyExitCode); end; else begin WriteLn('Error: ', ExitCode); end; end; end; var f : file; begin // Assign new ExitProc AddExitProc(@end); // Open a file that doesn't exist Assign(f, 'abc.txt'); // This triggers runtime error 2 Reset(f); // Cancel with your own code. Halt(MyExitCode); end.