如何检测连接到系统的设备何时可供使用？
如果这与之前的问题类似，我很抱歉，但这是我刚刚注意到的。 我可以检测我的设备何时连接到系统（通过 USB）并正确捕获消息，但是如果我拔下并重新插入设备，尝试通过 CreateFile() 函数始终返回错误：ERROR_GEN_FAILURE 31 (0x1F)这意味着 -连接到系统的设备无法运行，但是，在收到 微软自己的定义是“设备或介质已插入并且现已推出”。我相信这里发生的情况是，该错误更多地与设备未准备好有关，即使它被报告为已准备好，因为如果我再次重新枚举系统上的设备列表，则该设备已准备好。还有其他人遇到过并解决了这个问题吗？或者我遗漏/忽略了什么？
I'm sorry if this is similar to an earlier question but this is something I just noticed.
I can detect when my device is attached to the system (via usb) and trap the message correctly however if I unplug and plug the device back, attempting to access the device via the CreateFile() function always returns an error: ERROR_GEN_FAILURE 31 (0x1F) which translates to -A device attached to the system is not functioning, this is however, attempted after recieving the DBT_DEVICEARRIVAL message which by microsoft's own definition says "A device or piece of media has been inserted and is now available". I believe what's going on here is that the error has more to do with the device not being ready even though it's reported as being ready because if I re-enumerate the list of devices on the system again, the device is ready. Has anyone else encountered and gotten past this problem? Or is there something I'm missing/overlooking?
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在我看来，处理这个问题最简单的方法是通过 WMI。
请参阅此处： http://dotnetslackers.com/community/blogs/basharkokash/archive/2008/02/06/usb-port-insert-remove-detection-using-wmi.aspx
我在USB 驱动器检测过去了，它非常简单，回调使事情变得非常干净
The simplest way to deal with this, IMO, is through WMI.
See here: http://dotnetslackers.com/community/blogs/basharkokash/archive/2008/02/06/usb-port-insert-remove-detection-using-wmi.aspx
I have used WMI in the past for USB drive detection and it is dead simple and the callback makes things pretty clean