USB复合设备“准备使用".事件? [英] USB composite device "ready to use" event?

问题描述

我正在编写一个应用程序，该应用程序需要在连接到USB端口后立即与USB复合设备进行通信.
我正在使用WM_DEVICECHANGE和DBT_DEVICEARRIVAL来获取当设备已连接时会收到通知，此后我立即开始与设备通信.
现在，如果设备是第一次连接，我会遇到麻烦. Windows正在安装复合设备的每个接口(有4个接口-音频，指向，音量控制，用户控制)，这需要一些时间.但是，Windows在其安装过程开始时已经发送了DBT_DEVICEARRIVAL消息.因此我得到了消息并开始进行通信，但是我遇到了读写错误，直到Windows完成界面的安装为止.

我想通过不处理DBT_DEVICEARRIVAL消息来解决此问题，而是处理其他一些消息，当Windows已完成所有设备接口的安装时(->当您的设备准备就绪，可以使用"消息框出现时，将发送此消息).

是否有这样的消息?

btw:在xp，vista，7上是相同的.

请注意，
Robert

Hi,

i am writing an application which needs to communicate with a USB composite device as soon as it is connected to the USB port.
I am using WM_DEVICECHANGE and DBT_DEVICEARRIVAL to get notified when the device was connected, and immediately after that i start communicating to the device.
Now i have troubles, if the device was connected for the very first time. Windows is installing each interface of the composite device (there are 4interfaces - audio, pointing, volume control, comsumer control), which takes some time. however, windows sends the DBT_DEVICEARRIVAL message already at the beginning of its installation process. so i get the message and start communicating, however i get read and write errors, until windows has finished installing the interfaces.

i want to solve this problem by not handling the DBT_DEVICEARRIVAL message, but some other message, which is sent, when windows has finished installing all device interfaces (-> when the "your device is ready to use" messagebox appears).

Is there such a message?

btw: this is the same on xp, vista, 7.

Regards,
Robert

推荐答案

那里没有这样的消息.

There is no such message.

但是我认为实际的问题出在您尝试与设备进行通信的方式上.

But I believe the actual problem is in the way you're trying to communicate with the device.

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