问Windows XP上的ReadFile函数失败，错误代码为2

EN

/**
 * Allocates and manages page-aligned virtual memory of the given amount
 */
class VirtualMemBuffer {
public:
    explicit VirtualMemBuffer(size_t size) { /* skipped */ };
/* skipped */
protected:
    void * data;
public:
    const void * buff() const { return this->data; };
};

static const size_t cFileSize = 4096;

typedef std::map<std::wstring, HANDLE> handlers_conrainer_type;
typedef std::pair<std::wstring, bool> item_type;

class Config {
public:
    typedef std::vector<item_type > container_type;

    container_type files;
    /* skipped */
};

VirtualMemBuffer buffer(cFileSize);

Config config(...);
config->files.push_back(item_type(L"C:\\lock-file.lock", true));

/* skipped */

for (Config::container_type::const_iterator it = config->files.begin(); 
     it != config->files.end(); 
     ++it)
{
    HANDLE hFile = CreateFile(
        (LPCWSTR)(it->first.c_str()),
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_ALWAYS,
        FILE_ATTRIBUTE_NORMAL,
        NULL);

    if (hFile == INVALID_HANDLE_VALUE) {
        DWORD error = GetLastError();
        // Could not open the file, ignore it
        continue;
    } else {
        DWORD bytes_written = 0;
        BOOL write_ok = WriteFile(
                                    hFile, 
                                    buffer.buff(), 
                                    cFileSize, 
                                    &bytes_written, 
                                    NULL);

        if (!write_ok || (bytes_written != (DWORD)(cFileSize))) {
            // Could not initialize the file, skip the file
            CloseHandle(hFile);
            continue;
        };

        handlers_container.insert(
                std::pair<std::wstring, HANDLE>(it->first, hFile)
                );
    };
};

/* skipped */

for (handlers_conrainer_type::const_iterator it = handlers_container.begin(); 
     it != handlers_container.end(); 
     ++it)
{
    DWORD bytes_read = 0;
    LARGE_INTEGER li;
        li.HighPart = 0;
        li.LowPart = 0;
    BOOL move_ok = SetFilePointerEx(it->second, li, NULL, FILE_BEGIN);
    BOOL read_ok = ReadFile(
                                it->second, 
                                buffer.buff(), 
                                cFileSize, 
                                &bytes_read, 
                                NULL);

    if (!read_ok || (bytes_read != cFileSize)) {
        DWORD error = GetLastError();        // error == 2 :-(
        /* skipped */
    };
};