Utility code to log crashes to .dmp files on Windows for remote debugging

win_crash_dmp_logger.cpp

#include <windows.h>
#include <dbghelp.h>
#include <iostream>
#include <strsafe.h>

// Link with the DbgHelp.lib
#pragma comment(lib, "dbghelp.lib")

// Function to create the dump file
void CreateDump(EXCEPTION_POINTERS* pExceptionPointers, TCHAR* szFileName)
{
    // Define the dump file path
    TCHAR szPath[MAX_PATH];
    SYSTEMTIME st;
    GetSystemTime(&st);
    GetTempPath(MAX_PATH, szPath);
    StringCchPrintf(szFileName, MAX_PATH, TEXT("%s%s_%04d%02d%02d_%02d%02d%02d.dmp"), szPath, TEXT("MyAppCrashDump"),
        st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);

    // Create the dump file
    HANDLE hDumpFile = CreateFile(szFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    if (hDumpFile != INVALID_HANDLE_VALUE)
    {
        MINIDUMP_EXCEPTION_INFORMATION dumpInfo;
        dumpInfo.ThreadId = GetCurrentThreadId();
        dumpInfo.ExceptionPointers = pExceptionPointers;
        dumpInfo.ClientPointers = TRUE;

        // Write the dump file
        MiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(), hDumpFile, MiniDumpWithDataSegs, &dumpInfo, NULL, NULL);

        CloseHandle(hDumpFile);
    }
}

// Custom unhandled exception filter
LONG WINAPI CustomUnhandledExceptionFilter(EXCEPTION_POINTERS* pExceptionPointers)
{
    TCHAR szFileName[MAX_PATH];
    CreateDump(pExceptionPointers, szFileName);

    // Copy file path to clipboard
    if (OpenClipboard(NULL))
    {
        EmptyClipboard();
        size_t size = (lstrlen(szFileName) + 1) * sizeof(TCHAR);
        HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, size);
        if (hMem)
        {
            memcpy(GlobalLock(hMem), szFileName, size);
            GlobalUnlock(hMem);
            SetClipboardData(CF_UNICODETEXT, hMem);
        }
        CloseClipboard();
    }

    // Show a message box with the dump file location
    TCHAR szMessage[MAX_PATH + 50];
    StringCchPrintf(szMessage, MAX_PATH + 50, TEXT("The application has crashed.\nA dump file has been created and the path has been copied to the clipboard:\n%s"), szFileName);
    MessageBox(NULL, szMessage, TEXT("Application Crash"), MB_OK | MB_ICONERROR);

    return EXCEPTION_EXECUTE_HANDLER;
}

// Function to cause a crash (access violation)
void CauseCrash()
{
    int* p = nullptr;
    *p = 0;  // CRASH!!
}

int main()
{
	// Only install our custom unhandled exception filter if the debugger isn't attached.
    if (!IsDebuggerPresent())
    {
        // Set the custom unhandled exception filter
        SetUnhandledExceptionFilter(CustomUnhandledExceptionFilter);
    }

    std::cout << "This app will crash to test crash dump logging." << std::endl;

    // Cause a crash
    CauseCrash();

    return 0;
}