c - 访问双指针

Question

typedef 结构 _WDF_USB_DEVICE_SELECT_CONFIG_PARAMS {

超长尺寸；

WdfUsbTargetDeviceSelectConfigType 类型；

联盟{

struct {
  PUSB_CONFIGURATION_DESCRIPTOR  ConfigurationDescriptor;
  PUSB_INTERFACE_DESCRIPTOR*  InterfaceDescriptors;
  ULONG NumInterfaceDescriptors;
} Descriptor;
struct {
  PURB  Urb;
} Urb;
struct {
  UCHAR  NumberConfiguredPipes;
  WDFUSBINTERFACE  ConfiguredUsbInterface;
} SingleInterface;
struct {
  UCHAR  NumberInterfaces;
  PWDF_USB_INTERFACE_SETTING_PAIR  Pairs;
  UCHAR  NumberOfConfiguredInterfaces;
} MultiInterface;

} 类型；

} WDF_USB_DEVICE_SELECT_CONFIG_PARAMS, *PWDF_USB_DEVICE_SELECT_CONFIG_PARAMS;

WDF_USB_DEVICE_SELECT_CONFIG_PARAMS 参数；

typedef 结构 _USB_INTERFACE_DESCRIPTOR {

UCHAR 长度；

UCHAR b接口(interface)类;

UCHAR bInterfaceSubClass ;

} USB_INTERFACE_DESCRIPTOR, *PUSB_INTERFACE_DESCRIPTOR ;

能够通过 -> params.Types.Descriptor.NumInterfaceDescriptors 访问 NumInterfaceDescriptors

我想通过 WDF_USB_DEVICE_SELECT_CONFIG_PARAMS 访问 bInterfaceClass。请注意，此结构由我必须访问它的库填充

Answer 1

(*someIntDesc)->iInterface