University:
California State University, Northridge
Course:
COMP 410 | Logic Programming
Academic year:

2024
Views:

292

Pages:

8
Author:

rdespairqq7

Chapter 4 Structured Exception Handling 1 PART II Termination Handlers 20 TRY-FINALLY BLOCKS Example: The finally block (almost) always exectutes while (...) __try { hTemp = CreateFile (TempFileName, ...); /* Block of guarded code */ ... if (...) break; /* finally block will run */ ... } __finally { /* Executes on every loop iteration */ /* termination handler (finally block) */ CloseHandle (hTemp); DeleteFile (TempFileName); } 21 TERMINATION HANDLERS Executed whenever control flow leaves the try block because of:    Reaching the end of the __try block Leaving the block because of execution of: return break longjump continue goto __leave An exception Executed in the context of the block or function it guards Control can pass from end of termination handler to next statement 22 ABNORMAL TERMINATION To detect termination for any reason other than reaching the end of the try block—use BOOL AbnormalTermination (VOID) to determine how the try block terminated TRUE — For abnormal termination FALSE — For normal termination 23 COMBINING FINALLY AND EXCEPT BLOCKS (1 of 2) __try { } /* Block of guarded code */ __except (filter_expression) { } /* Except block */ __finally { } /* You cannot do this ! */ 24 COMBINING FINALLY AND EXCEPT BLOCKS (2 of 2) __try { /* Outer try-except block */ while (...) __try { /* Inner try-fin block */ hFile = CreateFile (TempFile, ...); if (...) __try { /* Inner try-ex block */ ... } __except (EXCEPTION_EXECUTE_HANDLER) { ... /* Process FP exception. */ _clearfp(); } } __finally { /* End of while loop */ CloseHandle (hFile); DeleteFile (TempFile); } } __except (filter-expression) { } 25 LAB 4–A Write a program, toupper, which processes one or more files on the command line     The processing consists of converting lower case characters to upper case and writing the results to a new file If an input file is missing, ignore it and process the next Process the files in memory (allocate enough memory to read the entire file) Use exception handlers to detect and respond to all errors that occur during the processing 26

Structured Exception Handling, Part 2

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