libusb_get_descriptor() - syntax, references, call tree, description

Retrieve a descriptor from the default control pipe. This is a convenience function which formulates the appropriate control message to retrieve the descriptor.

Syntax

from libusb.h:2061

static inline int libusb_get_descriptor(libusb_device_handle *dev_handle, uint8_t desc_type, uint8_t desc_index, unsigned char *data, int length);

Arguments

dev_handle

a device handle

desc_type

the descriptor type, see libusb_descriptor_type

desc_index

the index of the descriptor to retrieve

data

output buffer for descriptor

length

size of data buffer

Return value

number of bytes returned in data, or LIBUSB_ERROR code on failure

References

Location	Text
libusb.h:2061	static inline int libusb_get_descriptor(libusb_device_handle *dev_handle,

Call Tree

Functions called by libusb_get_descriptor()

libusb_get_descriptor()

libusb_control_transfer()

all items filtered out

Data read by libusb_get_descriptor()

libusb_endpoint_direction::LIBUSB_ENDPOINT_IN

libusb_standard_request::LIBUSB_REQUEST_GET_DESCRIPTOR

libusb_get_descriptor()::dev_handle

libusb_get_descriptor()::desc_type

libusb_get_descriptor()::desc_index

libusb_get_descriptor()::data

libusb_get_descriptor()::length