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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 113
Software Guide
9.2.1.2 CHidManager Class Methods
Table 9-2. CHidManagerClass Methods
Method Type Description
Create() Public This method creates an invisible window and uses the returned win-
dow handle to register for HID device notification events, then it cre-
ates a list of existing HID devices that will be maintained by the HID
manager.
IsHidDevicePresent() Public This method attempts to open a handle to the HID device to deter-
mine if it is present (or not) and returns the result.
RefreshHidDevices() Public This method validates that all HID devices in the list are still present,
removes those from the list that are currently not present, scans the
list of all existing HID devices present, and then attempts to add the
existing HID devices to the list.
GetDeviceCount() Public This method returns the number of connected devices.
GetFirstHidDevice() Public This method returns a pointer to the first HID device in the list.
GetNextHidDevice() Public This method returns a pointer to the next HID device in the list.
GetCurrentHidDevice() Public This method returns a pointer to the current HID device in the list.
GetHidDeviceWithPath() Public This method scans the current list of HID devices and returns a
pointer to the HID device that matches the device path provided.
GetHidDevice
WithHandle()
Public This method scans the current list of HID devices and returns a
pointer to the HID device that matches the device handle provided.
HidDeviceAlreadyExists() Public This method determines if the HID device already exists in the list
AddHidDevice() Public This method checks if the provided HID device already exists, and if
not, adds the new HID device to the end of the list, increments the
HID device counter, and call the HID callback function to indicate a
new HID device was added.
RemoveHidDevice() Public This method closes the outstanding handle to the HID device, calls
the HID callback function to indicate that the HID device is being
removed, removes the HID device from the list, and deletes the HID
device.
RemoveAllHidDevices() Public This method scans though all HID devices in the list and removes
them.
CreateUniqueDeviceID() Public This method attempts to create and maintain a unique ID for the
associated HID device.
FreeUniqueDeviceID() Public This method frees the specified unique ID.
NewHidDevice() Protected This method allocates memory for a new HID device structure
DeleteHidDevice() Protected This method deletes previously allocated memory for an existing HID
device structure.
RegisterHidNotification() Protected This method registers for notification of events for all HID devices and
calls the HID callback function to indicate registration was completed.
HidDeviceArrival() Protected This method makes sure the HID device does not already exist in the
list, and then creates a new HID device, opens a handle to the
device, adds the new HID device to the list, and registers event notifi-
cation for this new HID device.
HidDeviceQuery
Removal()
Protected This method readies the HID device for removal by making sure the
handle is closed.
HidDeviceRemoval() Protected This method removes the HID device.
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