CODEWITHSUNDEEP
c++windowsvisual-studio
Nowibananatzki
Nowibananatzki

Reputation: 786

visual studio console program crashes after control-c

I'm using the latest update of Visual Studio 2019 (Version 16.5.0 Preview 2.0) and trying to intercept the control-c event. But for some reason the console program always crashes before calling my handler. By the way, the program crashes if even I don't install any handler.

Could this be a bug in the compiler? In general, how do you debug something like this?

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <iostream>
#include <cstdint>

uint64_t iterations;
bool running;

BOOL WINAPI CtrlHandler(DWORD fdwCtrlType)
{
    switch (fdwCtrlType) {
        case CTRL_C_EVENT: {
            running = false;
            return TRUE;
        } break;
        default: {
            return FALSE;
        } break;
    }
}

int main()
{
    if (!SetConsoleCtrlHandler(CtrlHandler, TRUE)) {
        std::cout << "Could not install control handler" << std::endl;
    }
    running = true;
    while (running) {
        iterations++;
    }
    std::cout << "Terminated after " << iterations << " iterations." << std::endl;
    return 0;
}

enter image description here

Upvotes: 1

Views: 914

Answers (1)

Lukas Thiersch
Lukas Thiersch

Reputation: 165

https://learn.microsoft.com/en-us/windows/console/setconsolectrlhandler

Here it says that if an application is being debugged, "the system generates a DBG_CONTROL_C exception. This exception is raised only for the benefit of the debugger". Hence it isn't chrashing; you can continue excectution and it should work fine. The documentation says:

If the debugger passes the exception on unhandled, CTRL+C is passed to the console process and treated as a signal, as previously discussed.

Upvotes: 3

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