debugger.cpp

#include <Windows.h>
#include <iostream>

int main()
{
    STARTUPINFO startupInfo;
    PROCESS_INFORMATION processInfo;

    ZeroMemory(&startupInfo, sizeof(startupInfo));
    startupInfo.cb = sizeof(startupInfo);
    ZeroMemory(&processInfo, sizeof(processInfo));

    CreateProcess(L"CrashingProgram.exe", NULL, NULL, NULL, FALSE, 0, NULL, NULL, &startupInfo, &processInfo);

    DebugActiveProcess(processInfo.dwProcessId);

    while (true)
    {
        DEBUG_EVENT debugEvent;

        if (!WaitForDebugEvent(&debugEvent, 2'000))
            break;

        const EXCEPTION_RECORD& exceptionRecord = debugEvent.u.Exception.ExceptionRecord;
        const DWORD exceptionCode = exceptionRecord.ExceptionCode;

        // We only care about access violation events
        if (debugEvent.dwDebugEventCode == EXCEPTION_DEBUG_EVENT && exceptionCode == EXCEPTION_ACCESS_VIOLATION)
        {
            DWORD64 address = debugEvent.u.Exception.ExceptionRecord.ExceptionInformation[1];

            std::cout << "Access violation at address: " << std::hex << address << std::endl;

            return 0;
        }

        ContinueDebugEvent(debugEvent.dwProcessId, debugEvent.dwThreadId, DBG_CONTINUE);
    }

    return 0;
}