The SEH Termination Sample Application
The SEHTerm application, 23-SEHTerm.exe, demonstrates how termination handlers work. The source code and resource files for the application are in the 23-SEHTerm directory on the companion content Web page.
When you run the application, the primary thread enters a
try block. Inside this
try block, the following message box is displayed:
This message box asks whether you want the program to access an invalid byte in memory. (Most applications aren't as considerate as this; they usually just access invalid memory without asking.) Let's examine what happens if you click the No
button. In this case, the thread naturally flows out of the
try block and enters the
finally block that displays a message box: