请给我一个demo

以下是一个使用 RegisterDeviceNotification 函数获取新插入设备盘符的简单示例：

#include <windows.h>
#include <dbt.h>
#include <iostream>
#include <vector>
using namespace std;

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 创建窗口
    const wchar_t CLASS_NAME[] = L"Sample Window Class";
    WNDCLASS wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    RegisterClass(&wc);

    HWND hWnd = CreateWindowEx(
        0,
        CLASS_NAME,
        L"Sample Window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL
    );

    if (hWnd == NULL)
    {
        return 0;
    }

    // 注册设备通知
    DEV_BROADCAST_DEVICEINTERFACE NotificationFilter = {};
    NotificationFilter.dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    NotificationFilter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    HDEVNOTIFY hDevNotify = RegisterDeviceNotification(hWnd, &NotificationFilter,
        DEVICE_NOTIFY_WINDOW_HANDLE | DEVICE_NOTIFY_ALL_INTERFACE_CLASSES);

    // 处理消息循环
    MSG msg = {};
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    // 注销设备通知
    UnregisterDeviceNotification(hDevNotify);

    return 0;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_DEVICECHANGE:
        if (wParam == DBT_DEVICEARRIVAL)
        {
            // 获取当前系统中所有逻辑驱动器
            wchar_t Drives[128];
            ZeroMemory(Drives, 128 * sizeof(wchar_t));
            GetLogicalDriveStrings(128, Drives);

            // 将驱动器列表转换为 vector 类型
            vector<wstring> DriveList;
            wchar_t* p = Drives;
            while (*p)
            {
                DriveList.push_back(p);
                p += wcslen(p) + 1;
            }

            // 查找新插入的驱动器盘符
            DEV_BROADCAST_DEVICEINTERFACE* pDev = (DEV_BROADCAST_DEVICEINTERFACE*)lParam;
            wstring DeviceName = pDev->dbcc_name;
            size_t pos = DeviceName.find_last_of(L'\\');
            wstring DeviceID = DeviceName.substr(pos + 1);
            wchar_t DriveLetter = 0;
            for (wchar_t c = L'C'; c <= L'Z'; c++)
            {
                wstring DrivePath = wstring(1, c) + L":\\";
                if (find(DriveList.begin(), DriveList.end(), DrivePath) == DriveList.end())
                {
                    // 驱动器不存在，说明是新插入的设备
                    DriveLetter = c;
                    break;
                }
            }

            if (DriveLetter != 0)
            {
                wcout << L"New device inserted: " << DriveLetter << L":" << endl;
            }
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

在上述示例中，我们创建了一个窗口，并在窗口创建完成后使用 RegisterDeviceNotification 函数注册设备通知。在处理 WM_DEVICECHANGE 消息时，我们首先使用 GetLogicalDriveStrings 函数获取当前系统中所有逻辑驱动器的列表，然后通过比较新插入设备的设备 ID 和驱动器列表，找出新插入的驱动器盘符。最后，我们使用 wcout 输出新插入设备的盘符。