用C++检测Windows中的USB插入/删除事件

我正在为一个现有的应用程序扩展一个扩展,它需要处理USB插入/删除事件。我知道感兴趣的设备的VID/PID。但是,我无法访问窗口句柄,所以我不知道 RegisterDeviceNotification 会很有用,除非有办法通过 WINAPI . 用C++检测USB插入/删除事件的最佳方法是什么?

This sample code on the Microsoft website 显示如何通过WMI接收事件通知:

如何修改它以接收USB插入/删除事件?或者,我还有别的办法吗?我正在使用Visual Studio 2008。谢谢。

附加信息

DEFINE_GUID(GUID_INTERFACE_CP210x, 0x993f7832, 0x6e2d, 0x4a0f, 0xb2, 0x72, 0xe2, 0xc7, 0x8e, 0x74, 0xf9, 0x3e);

MyClass::MyClass()
{
    // Generate message-only window
    _pWndClassEx = (WNDCLASSEX *)malloc( sizeof(WNDCLASSEX) );
    memset( _pWndClassEx, 0, sizeof(WNDCLASSEX) );
    _pWndClassEx->cbSize = sizeof(WNDCLASSEX);
    _pWndClassEx->lpfnWndProc = (WNDPROC)WndProc; // function which will handle messages
    _pWndClassEx->hInstance = GetCurrentModule();
    _pWndClassEx->lpszClassName = pClassName;
    atom = RegisterClassEx( _pWndClassEx );
    _hWnd = CreateWindowEx( 0, pClassName, pWindowName, 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL );

    // Register the USB device for notification
    _pDevIF = (DEV_BROADCAST_DEVICEINTERFACE *)malloc( sizeof(DEV_BROADCAST_DEVICEINTERFACE) );
    memset( _pDevIF, 0, sizeof(DEV_BROADCAST_DEVICEINTERFACE) );
    _pDevIF->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    _pDevIF->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    _pDevIF->dbcc_classguid = GUID_INTERFACE_CP210x;
    _hNotifyDevNode = RegisterDeviceNotification( _hWnd, _pDevIF, DEVICE_NOTIFY_WINDOW_HANDLE );
}

static bool OnDeviceChange(UINT nEventType, DWORD dwData)
{
    switch ( nEventType )
    {
    case DBT_DEVICEARRIVAL:
        // A device has been inserted adn is now available.
        break;

    case DBT_DEVICEREMOVECOMPLETE:
        // Device has been removed.
        break;

    default:
        break;
    }

    return true;
}

static LRESULT WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
{
    switch ( message )
    {
    case WM_DEVICECHANGE:
        OnDeviceChange( wParam, lParam ); // Set breakpoint (never gets here)
        break;

    default:
        break;
    }

    return DefWindowProc(hwnd, message, wParam, lParam);
}

电脑进入 WndProc ,但在卸下/插入USB设备时不会。这台电脑似乎永远也进不去 OnDeviceChange

其他信息: 打电话 CreateWindowEx atom 返回者 RegisterClassEx 失败,错误消息为“找不到窗口类”

_hWnd = CreateWindowEx( 0, (LPCTSTR)&atom, pWindowName, 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, NULL, NULL );

我也在尝试这种新方法。我正在尝试使用“只写消息”窗口接收USB设备的设备更改通知消息。我使用的是MFC、C++和VisualStudio 2008。所有东西都会编译,运行时不会崩溃或锁定,但事件处理程序永远不会被触发。感兴趣的设备作为虚拟COM端口安装在Windows上。

我的主应用程序实例化下面描述的类,然后使用while循环等待来自键盘轮询的字符输入。正是在这段等待时间内,我移除并插入USB设备,期望事件被触发。

class CMessageOnlyWindow : public CWnd
{
    DECLARE_DYNAMIC(CMessageOnlyWindow)
private:
    DEV_BROADCAST_DEVICEINTERFACE * _pDevIF; // The notification filter.
    HDEVNOTIFY _hNotifyDev;             // The device notification handle.
public:
    CMessageOnlyWindow();
    virtual ~CMessageOnlyWindow();
protected:
    afx_msg BOOL OnDeviceChange( UINT nEventType, DWORD dwData );
private:
    void RegisterNotification( void );
    void UnregisterNotification( void );
protected:
    DECLARE_MESSAGE_MAP()               // Must be last.
};

为了简单起见,我删除了所有清理和错误处理:

DEFINE_GUID(GUID_INTERFACE_CP210x, 0x993f7832, 0x6e2d, 0x4a0f, \
    0xb2, 0x72, 0xe2, 0xc7, 0x8e, 0x74, 0xf9, 0x3e);

IMPLEMENT_DYNAMIC(CMessageOnlyWindow, CWnd)

CMessageOnlyWindow::CMessageOnlyWindow()
{
    CString cstrWndClassName = ::AfxRegisterWndClass( NULL );
    BOOL bCreated = this->CreateEx( 0, cstrWndClassName,
        L"CMessageOnlyWindow", 0, 0, 0, 0, 0, HWND_MESSAGE, 0 );
    this->RegisterNotification();
}

CMessageOnlyWindow::~CMessageOnlyWindow() {}

BEGIN_MESSAGE_MAP(CMessageOnlyWindow, CWnd)
    ON_WM_DEVICECHANGE()
END_MESSAGE_MAP()

afx_msg BOOL CMessageOnlyWindow::OnDeviceChange( UINT nEventType, DWORD dwData )
{
    switch ( nEventType ) // <-- Never gets here.
    {
    case DBT_DEVICEARRIVAL:
        break;

    case DBT_DEVICEREMOVECOMPLETE:
        break;

    default:
        break;
    }

    return TRUE;
}

void CMessageOnlyWindow::RegisterNotification(void)
{
    _pDevIF = (DEV_BROADCAST_DEVICEINTERFACE *)malloc( sizeof(DEV_BROADCAST_DEVICEINTERFACE) );
    memset( _pDevIF, 0, sizeof(DEV_BROADCAST_DEVICEINTERFACE) );
    _pDevIF->dbcc_size = sizeof(DEV_BROADCAST_DEVICEINTERFACE);
    _pDevIF->dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
    _pDevIF->dbcc_classguid = GUID_INTERFACE_CP210x;
    _hNotifyDev = RegisterDeviceNotification( this->m_hWnd, _pDevIF, DEVICE_NOTIFY_WINDOW_HANDLE );
}

void CMessageOnlyWindow::UnregisterNotification(void)
{
    UnregisterDeviceNotification( _hNotifyDev );
}

如有任何想法或建议,将不胜感激。如果有任何细节遗漏,请告诉我,我很乐意补充。谢谢。