从codeproject中检查此链接

使用C#弹出USB磁盘 [在C#程序中检测USB驱动器的移除 [ ^ ]

http://www.developerfusion.com/article/84338/making-usb-c-friendly / [ ^ ]

希望他们能为您提供帮助

Check this links from codeproject

Eject USB disks using C#[^]

Detecting USB Drive Removal in a C# Program[^]

http://www.developerfusion.com/article/84338/making-usb-c-friendly/[^]

Hope they will help you

说它不起作用还不够.您还需要发布错误消息.此外，您还需要提供有关正在使用的OCR机器和SDK的其他详细信息.无论如何，即使您已发布它，也不保证您的问题会立即得到回答，因为可能没有多少人知道该SDK.如果您拥有SDK开发人员的网站，建议您也通过他们的支持页面以及问题的详细信息与他们联系.

Saying it is not working is not enough. You need to post the error messages as well. In addition, you also need to provide other details of what OCR machine and SDK you are working on. Anyway, even if you have posted it, its not a guarantee that your question will be answered right away because not many people may know about that SDK. If you have a website of the developers of the SDK, I suggest you contact them as well through their support page together with the details of your issue.