区分数据卡和笔式驱动器或USB闪存驱动器 [英] Differentiating between data card and pen drive or USB flash drive

问题描述

我有一张可以插入 USB 端口的 Vodaphone 数据卡.

I am having a Vodaphone data card which can be inserted in a USB port.

我有 XP 和 Vista 操作系统，我正在使用 Windows 的 WM_DEVICECHANGE 事件来了解 USB 的插入和移除，它对我来说工作正常.

I have XP and Vista OS, and I am using WM_DEVICECHANGE event of Windows, to know USB Insertion and removal, and it's working fine for me.

但我无法区分数据卡插入和笔式驱动器插入.可能吗?

But I am not able to differentiate between Data card insertion and Pen drive insertion. Is it possible?

推荐答案

是的.笔式驱动器"和数据卡"实现不同的接口.您将使用 RegisterDeviceNotification 订阅 DEV_BROADCAST_DEVICEINTERFACE.您返回的 WM_DEVICECHANGE 的 LPARAM 将是 DEV_BROADCAST_DEVICEINTERFACE*.这个结构有一个 dbcc_classguid 成员.这将是您的笔式驱动器的 GUID_DEVINTERFACE_VOLUME，以及您的数据卡的其他内容 - 实验.

Yes. The "pen drive" and "data card" implement different interfaces. You will have subscribed using RegisterDeviceNotification for DEV_BROADCAST_DEVICEINTERFACE. The LPARAM of the WM_DEVICECHANGE you get back will then be a DEV_BROADCAST_DEVICEINTERFACE*. This structure has a dbcc_classguid member. This will be GUID_DEVINTERFACE_VOLUME for your pen drive, and something else for your datacard - experiment.

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