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+/*******************************************************
+ HIDAPI - Multi-Platform library for
+ communication with HID devices.
+
+ Alan Ott
+ Signal 11 Software
+
+ 8/22/2009
+
+ Copyright 2009, All Rights Reserved.
+
+ At the discretion of the user of this library,
+ this software may be licensed under the terms of the
+ GNU General Public License v3, a BSD-Style license, or the
+ original HIDAPI license as outlined in the LICENSE.txt,
+ LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
+ files located at the root of the source distribution.
+ These files may also be found in the public source
+ code repository located at:
+ http://github.com/signal11/hidapi .
+********************************************************/
+
+/** @file
+ * @defgroup API hidapi API
+ */
+
+#ifndef HIDAPI_H__
+#define HIDAPI_H__
+
+#include <wchar.h>
+
+#ifdef _WIN32
+ #define HID_API_EXPORT __declspec(dllexport)
+ #define HID_API_CALL
+#else
+ #define HID_API_EXPORT /**< API export macro */
+ #define HID_API_CALL /**< API call macro */
+#endif
+
+#define HID_API_EXPORT_CALL HID_API_EXPORT HID_API_CALL /**< API export and call macro*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+ struct hid_device_;
+ typedef struct hid_device_ hid_device; /**< opaque hidapi structure */
+
+ /** hidapi info structure */
+ struct hid_device_info {
+ /** Platform-specific device path */
+ char *path;
+ /** Device Vendor ID */
+ unsigned short vendor_id;
+ /** Device Product ID */
+ unsigned short product_id;
+ /** Serial Number */
+ wchar_t *serial_number;
+ /** Device Release Number in binary-coded decimal,
+ also known as Device Version Number */
+ unsigned short release_number;
+ /** Manufacturer String */
+ wchar_t *manufacturer_string;
+ /** Product string */
+ wchar_t *product_string;
+ /** Usage Page for this Device/Interface
+ (Windows/Mac only). */
+ unsigned short usage_page;
+ /** Usage for this Device/Interface
+ (Windows/Mac only).*/
+ unsigned short usage;
+ /** The USB interface which this logical device
+ represents. Valid on both Linux implementations
+ in all cases, and valid on the Windows implementation
+ only if the device contains more than one interface. */
+ int interface_number;
+
+ /** Pointer to the next device */
+ struct hid_device_info *next;
+ };
+
+
+ /** @brief Initialize the HIDAPI library.
+
+ This function initializes the HIDAPI library. Calling it is not
+ strictly necessary, as it will be called automatically by
+ hid_enumerate() and any of the hid_open_*() functions if it is
+ needed. This function should be called at the beginning of
+ execution however, if there is a chance of HIDAPI handles
+ being opened by different threads simultaneously.
+
+ @ingroup API
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_init(void);
+
+ /** @brief Finalize the HIDAPI library.
+
+ This function frees all of the static data associated with
+ HIDAPI. It should be called at the end of execution to avoid
+ memory leaks.
+
+ @ingroup API
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_exit(void);
+
+ /** @brief Enumerate the HID Devices.
+
+ This function returns a linked list of all the HID devices
+ attached to the system which match vendor_id and product_id.
+ If @p vendor_id is set to 0 then any vendor matches.
+ If @p product_id is set to 0 then any product matches.
+ If @p vendor_id and @p product_id are both set to 0, then
+ all HID devices will be returned.
+
+ @ingroup API
+ @param vendor_id The Vendor ID (VID) of the types of device
+ to open.
+ @param product_id The Product ID (PID) of the types of
+ device to open.
+
+ @returns
+ This function returns a pointer to a linked list of type
+ struct #hid_device, containing information about the HID devices
+ attached to the system, or NULL in the case of failure. Free
+ this linked list by calling hid_free_enumeration().
+ */
+ struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id);
+
+ /** @brief Free an enumeration Linked List
+
+ This function frees a linked list created by hid_enumerate().
+
+ @ingroup API
+ @param devs Pointer to a list of struct_device returned from
+ hid_enumerate().
+ */
+ void HID_API_EXPORT HID_API_CALL hid_free_enumeration(struct hid_device_info *devs);
+
+ /** @brief Open a HID device using a Vendor ID (VID), Product ID
+ (PID) and optionally a serial number.
+
+ If @p serial_number is NULL, the first device with the
+ specified VID and PID is opened.
+
+ @ingroup API
+ @param vendor_id The Vendor ID (VID) of the device to open.
+ @param product_id The Product ID (PID) of the device to open.
+ @param serial_number The Serial Number of the device to open
+ (Optionally NULL).
+
+ @returns
+ This function returns a pointer to a #hid_device object on
+ success or NULL on failure.
+ */
+ HID_API_EXPORT hid_device * HID_API_CALL hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number);
+
+ /** @brief Open a HID device by its path name.
+
+ The path name be determined by calling hid_enumerate(), or a
+ platform-specific path name can be used (eg: /dev/hidraw0 on
+ Linux).
+
+ @ingroup API
+ @param path The path name of the device to open
+
+ @returns
+ This function returns a pointer to a #hid_device object on
+ success or NULL on failure.
+ */
+ HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path);
+
+ /** @brief Write an Output report to a HID device.
+
+ The first byte of @p data[] must contain the Report ID. For
+ devices which only support a single report, this must be set
+ to 0x0. The remaining bytes contain the report data. Since
+ the Report ID is mandatory, calls to hid_write() will always
+ contain one more byte than the report contains. For example,
+ if a hid report is 16 bytes long, 17 bytes must be passed to
+ hid_write(), the Report ID (or 0x0, for devices with a
+ single report), followed by the report data (16 bytes). In
+ this example, the length passed in would be 17.
+
+ hid_write() will send the data on the first OUT endpoint, if
+ one exists. If it does not, it will send the data through
+ the Control Endpoint (Endpoint 0).
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param data The data to send, including the report number as
+ the first byte.
+ @param length The length in bytes of the data to send.
+
+ @returns
+ This function returns the actual number of bytes written and
+ -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_write(hid_device *device, const unsigned char *data, size_t length);
+
+ /** @brief Read an Input report from a HID device with timeout.
+
+ Input reports are returned
+ to the host through the INTERRUPT IN endpoint. The first byte will
+ contain the Report number if the device uses numbered reports.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param data A buffer to put the read data into.
+ @param length The number of bytes to read. For devices with
+ multiple reports, make sure to read an extra byte for
+ the report number.
+ @param milliseconds timeout in milliseconds or -1 for blocking wait.
+
+ @returns
+ This function returns the actual number of bytes read and
+ -1 on error. If no packet was available to be read within
+ the timeout period, this function returns 0.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds);
+
+ /** @brief Read an Input report from a HID device.
+
+ Input reports are returned
+ to the host through the INTERRUPT IN endpoint. The first byte will
+ contain the Report number if the device uses numbered reports.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param data A buffer to put the read data into.
+ @param length The number of bytes to read. For devices with
+ multiple reports, make sure to read an extra byte for
+ the report number.
+
+ @returns
+ This function returns the actual number of bytes read and
+ -1 on error. If no packet was available to be read and
+ the handle is in non-blocking mode, this function returns 0.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_read(hid_device *device, unsigned char *data, size_t length);
+
+ /** @brief Set the device handle to be non-blocking.
+
+ In non-blocking mode calls to hid_read() will return
+ immediately with a value of 0 if there is no data to be
+ read. In blocking mode, hid_read() will wait (block) until
+ there is data to read before returning.
+
+ Nonblocking can be turned on and off at any time.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param nonblock enable or not the nonblocking reads
+ - 1 to enable nonblocking
+ - 0 to disable nonblocking.
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_set_nonblocking(hid_device *device, int nonblock);
+
+ /** @brief Send a Feature report to the device.
+
+ Feature reports are sent over the Control endpoint as a
+ Set_Report transfer. The first byte of @p data[] must
+ contain the Report ID. For devices which only support a
+ single report, this must be set to 0x0. The remaining bytes
+ contain the report data. Since the Report ID is mandatory,
+ calls to hid_send_feature_report() will always contain one
+ more byte than the report contains. For example, if a hid
+ report is 16 bytes long, 17 bytes must be passed to
+ hid_send_feature_report(): the Report ID (or 0x0, for
+ devices which do not use numbered reports), followed by the
+ report data (16 bytes). In this example, the length passed
+ in would be 17.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param data The data to send, including the report number as
+ the first byte.
+ @param length The length in bytes of the data to send, including
+ the report number.
+
+ @returns
+ This function returns the actual number of bytes written and
+ -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_send_feature_report(hid_device *device, const unsigned char *data, size_t length);
+
+ /** @brief Get a feature report from a HID device.
+
+ Set the first byte of @p data[] to the Report ID of the
+ report to be read. Make sure to allow space for this
+ extra byte in @p data[]. Upon return, the first byte will
+ still contain the Report ID, and the report data will
+ start in data[1].
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param data A buffer to put the read data into, including
+ the Report ID. Set the first byte of @p data[] to the
+ Report ID of the report to be read, or set it to zero
+ if your device does not use numbered reports.
+ @param length The number of bytes to read, including an
+ extra byte for the report ID. The buffer can be longer
+ than the actual report.
+
+ @returns
+ This function returns the number of bytes read plus
+ one for the report ID (which is still in the first
+ byte), or -1 on error.
+ */
+ int HID_API_EXPORT HID_API_CALL hid_get_feature_report(hid_device *device, unsigned char *data, size_t length);
+
+ /** @brief Close a HID device.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ */
+ void HID_API_EXPORT HID_API_CALL hid_close(hid_device *device);
+
+ /** @brief Get The Manufacturer String from a HID device.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param string A wide string buffer to put the data into.
+ @param maxlen The length of the buffer in multiples of wchar_t.
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT_CALL hid_get_manufacturer_string(hid_device *device, wchar_t *string, size_t maxlen);
+
+ /** @brief Get The Product String from a HID device.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param string A wide string buffer to put the data into.
+ @param maxlen The length of the buffer in multiples of wchar_t.
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT_CALL hid_get_product_string(hid_device *device, wchar_t *string, size_t maxlen);
+
+ /** @brief Get The Serial Number String from a HID device.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param string A wide string buffer to put the data into.
+ @param maxlen The length of the buffer in multiples of wchar_t.
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT_CALL hid_get_serial_number_string(hid_device *device, wchar_t *string, size_t maxlen);
+
+ /** @brief Get a string from a HID device, based on its string index.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+ @param string_index The index of the string to get.
+ @param string A wide string buffer to put the data into.
+ @param maxlen The length of the buffer in multiples of wchar_t.
+
+ @returns
+ This function returns 0 on success and -1 on error.
+ */
+ int HID_API_EXPORT_CALL hid_get_indexed_string(hid_device *device, int string_index, wchar_t *string, size_t maxlen);
+
+ /** @brief Get a string describing the last error which occurred.
+
+ @ingroup API
+ @param device A device handle returned from hid_open().
+
+ @returns
+ This function returns a string containing the last error
+ which occurred or NULL if none has occurred.
+ */
+ HID_API_EXPORT const wchar_t* HID_API_CALL hid_error(hid_device *device);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+