usb热插拔消息检测

CCyUSBDevice::CCyUSBDevice(HANDLE hnd = NULL, GUID guid = CYUSBDRV_GUID) 
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Description 

This is the constructor for the CCyUSBDevice class. 

It registers the window of hnd to receive USB Plug and Play messages when devices are connected or disconnected to/from the driver. 

The object created serves as the programming interface to the driver whose GUID is passed in the guid parameter. 

The constructor initializes the class members and then calls the Open(0) method to open the first device that is attached to the driver. 


Parameters 

hnd 
hnd is a handle to the application's main window (the window whose WndProc function will process USB PnP events). 

If you are building a console application or don't want your window to receive PnP events, you may omit the hnd parameter. 


guid 
guid is the GUID defined in the [Strings] section of the CyUsb.inf file (or your own named copy). If this parameter is omitted, guid defaults to CYUSBDRV_GUID. 


If you don't want to register for PnP events, but you do want to pass your own driver GUID to the constructor, you will need to pass NULL as the hnd parameter. 


Example 1