Question

Heres a simple question – is there anyway that a non-console (ie a CWinApp) application can receive and process CTRL+BREAK, it would appear SetConsoleCtrlHandler doesnt do the job nor the installation of signal handlers?

I unfortunately am working with a legacy CDialog based app which is run under the control of Microsoft HPC and HPC uses CTRL+BREAK to cancel the program (assuming i guess that nobody in their right mind would have a non-console app running in the background)

Cheers.

Answer 1

Calling AttachConsole with ATTACH_PARENT_PROCESS should do the trick. This will attach your process to the HPC console so that it can receive the control-break signal. You should probably do this before calling SetConsoleCtrlHandler.

If that doesn’t work, try AllocConsole instead. If HPC doesn’t have a console of its own, it might be assuming that the sub-process will have created a new console group (this happens automatically for console-mode applications) in which case it will be sending a control-break signal to the sub-process PID. If so, it shouldn’t matter whether the console group was created automatically or explicitly.

You may wish to start by making sure that HPC is indeed sending a control-break signal (presumably via GenerateConsoleCtrlEvent) by checking that SetConsoleCtrlHandler works as expected for a console-mode application. If it is calling TerminateProcess instead then there is nothing you can do about it.