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__except
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Category
Statements, Keyword Extensions
Syntax
__except (expression) compound-statement
Description
The __except keyword specifies the action that should be taken when the exception specified by expression has been raised.
Example
The following is the code fragment shows how to use the __except construct:
#include <stdio.h> #include <string.h> #include <windows.h> class Exception { public: Exception(char* s = "Unknown"){what = strdup(s); } Exception(const Exception& e ){what = strdup(e.what); } ~Exception() {free(what); } char* msg() const {return what; } private: char* what; }; int main() { float e, f, g; try { try { f = 1.0; g = 0.0; try { puts("Another exception:"); e = f / g; } __except(EXCEPTION_EXECUTE_HANDLER) { puts("Caught a C-based exception."); throw(Exception("Hardware error: Divide by 0")); } } catch(const Exception& e) { printf("Caught C++ Exception: %s :\n", e.msg()); } } __finally { puts("C++ allows __finally too!"); } return e; }
Running the above program results in the following:
Another exception:
Caught a C-based exception.
Caught C++ exception[Hardware error: Divide by 0]
C++ allows __finally too!