我应该如何在C++中正确使用FormatMessage()？

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

int main() {
    // 故意调用一个失败的函数以获取错误代码
    HANDLE hFile = CreateFile(TEXT("non_existent_file.txt"),
                                GENERIC_READ,
                                FILE_SHARE_READ,
                                NULL,
                                OPEN_EXISTING,
                                FILE_ATTRIBUTE_NORMAL,
                                NULL);

    if (hFile == INVALID_HANDLE_VALUE) {
        DWORD dwError = GetLastError();
        LPVOID lpMessageBuffer = nullptr;

        FormatMessage(
            FORMAT_MESSAGE_ALLOCATE_BUFFER |
            FORMAT_MESSAGE_FROM_SYSTEM |
            FORMAT_MESSAGE_IGNORE_INSERTS,
            NULL,
            dwError,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPTSTR)&lpMessageBuffer,
            0,
            NULL);

        std::wcout << L"Error code: " << dwError<< std::endl;
        std::wcout << L"Error message: " << (LPCTSTR)lpMessageBuffer<< std::endl;

        LocalFree(lpMessageBuffer);
    }

    return 0;
}