我是C ++的新手，这是我第一次真正尝试创建任何东西（虽然我还没有真正开始......）我正在尝试从MyoSDK编译示例代码（顺便说一句，这是很棒的设备）可以找到
here.每次编译时，都会出错。我的问题必不可少，归结为为什么它会关注__imp_libmyo_***而不仅仅是libmyo？
F:\GitHub\Myo\MyoSDK\samples>g++ -g hello-myo.cpp -o hello-myo -I F:/Github/Myo/ MyoSDK/include F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::ThrowOnError::~ThrowOnError()':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/../detail/ThrowOnError.hpp:33:undefined reference to `__imp_libmyo_error_kind'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/../detail/ThrowOnError.hpp:37:undefined reference to `__imp_libmyo_error_cstring'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/../detail/ThrowOnError.hpp:38:undefined reference to `__imp_libmyo_free_error_details'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/../detail/ThrowOnError.hpp:43:undefined reference to `__imp_libmyo_error_cstring'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/../detail/ThrowOnError.hpp:44:undefined reference to `__imp_libmyo_free_error_details'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Myo::vibrate(myo::Myo::VibrationType)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/../impl/Myo_impl.hpp:13:undefined ref erence to `__imp_libmyo_vibrate'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::Hub(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const&)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:23:undefined reference t o `__imp_libmyo_init_hub'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::~Hub()':F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:32:undefined reference t o `__imp_libmyo_shutdown_hub'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::waitForMyo(unsigned int)::local::handler(void*,void const*)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:44:undefined reference t o `__imp_libmyo_event_get_myo'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:46:undefined reference t o `__imp_libmyo_event_get_type'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::waitForMyo(unsigned int)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:59:undefined reference t o `__imp_libmyo_run'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::onDeviceEvent(void const*)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:94:undefined reference t o `__imp_libmyo_event_get_myo'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:98:undefined reference t o `__imp_libmyo_event_get_type'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:112:undefined reference to `__imp_libmyo_event_get_timestamp'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:114:undefined reference to `__imp_libmyo_event_get_type'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:116:undefined reference to `__imp_libmyo_event_get_firmware_version'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:117:undefined reference to `__imp_libmyo_event_get_firmware_version'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:118:undefined reference to `__imp_libmyo_event_get_firmware_version'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:119:undefined reference to `__imp_libmyo_event_get_firmware_version'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:127:undefined reference to `__imp_libmyo_event_get_firmware_version'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o:F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:128:more undefined references to `__imp_libmyo_event_get _firmware_version' follow
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::onDeviceEvent(void const*)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:140:undefined reference to `__imp_libmyo_event_get_x_direction'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:139:undefined reference to `__imp_libmyo_event_get_arm'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:150:undefined reference to `__imp_libmyo_event_get_orientation'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:150:undefined reference to `__imp_libmyo_event_get_orientation'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:150:undefined reference to `__imp_libmyo_event_get_orientation'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:150:undefined reference to `__imp_libmyo_event_get_orientation'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:154:undefined reference to `__imp_libmyo_event_get_accelerometer'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:154:undefined reference to `__imp_libmyo_event_get_accelerometer'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:154:undefined reference to `__imp_libmyo_event_get_accelerometer'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:159:undefined reference to `__imp_libmyo_event_get_gyroscope'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:159:undefined reference to `__imp_libmyo_event_get_gyroscope'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:159:undefined reference to `__imp_libmyo_event_get_gyroscope'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:163:undefined reference to `__imp_libmyo_event_get_pose'
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:166:undefined reference to `__imp_libmyo_event_get_rssi'
F:\Users\JACOB'~1\AppData\Local\Temp\cc5AVo40.o: In function `myo::Hub::run(unsigned int)':
F:/Github/Myo/MyoSDK/include/myo/cxx/impl/Hub_impl.hpp:184:undefined reference to `__imp_libmyo_run'
collect2.exe:error:ld returned 1 exit status
正在编译的文件都在SDK中。如果你下载它并像我一样编译它，你应该得到这个错误。
要显示第一个错误，我会添加ThrowOnError.hpp和libmyo.h
// Copyright (C) 2013-2014 Thalmic Labs Inc.
// Distributed under the Myo SDK license agreement. See LICENSE.txt for details.
#ifndef MYO_CXX_DETAIL_THROWONERROR_HPP
#define MYO_CXX_DETAIL_THROWONERROR_HPP
#include <stdexcept>
#include <myo/libmyo.h>
#if defined(_MSC_VER) && _MSC_VER <= 1800
#define LIBMYO_NOEXCEPT(b)
#else
#if __cplusplus >= 201103L
# define LIBMYO_NOEXCEPT(b) noexcept(b)
#else
# define LIBMYO_NOEXCEPT(b)
#endif
#endif
namespace myo {
class ThrowOnError {
public:
ThrowOnError()
: _error()
{
}
~ThrowOnError() LIBMYO_NOEXCEPT(false)
{
if (_error)
{
switch (libmyo_error_kind(_error)) {
case libmyo_error:
case libmyo_error_runtime:
{
std::runtime_error exception(libmyo_error_cstring(_error));
libmyo_free_error_details(_error);
throw exception;
}
case libmyo_error_invalid_argument:
{
std::invalid_argument exception(libmyo_error_cstring(_error));
libmyo_free_error_details(_error);
throw exception;
}
case libmyo_success:
{
break;
}
}
}
}
operator libmyo_error_details_t*()
{
return &_error;
}
private:
libmyo_error_details_t _error;
// Not implemented
ThrowOnError(const ThrowOnError&); // = delete;
ThrowOnError& operator=(const ThrowOnError&); // = delete;
};
} //namespace libmyo
#endif // MYO_CXX_DETAIL_THROWONERROR_HPP
libmyo.h：
// Copyright (C) 2013-2014 Thalmic Labs Inc.
// Distributed under the Myo SDK license agreement. See LICENSE.txt for details.
#ifndef MYO_LIBMYO_H
#define MYO_LIBMYO_H
#include <stdint.h>
#include "libmyo/detail/visibility.h"
#ifdef __cplusplus
extern "C" {
#endif
/// @file libmyo.h
/// libmyo C API declarations.
typedef void* libmyo_hub_t;
/// \defgroup errors Error Handling
/// @{
/// Function result codes.
/// All libmyo functions that can fail return a value of this type.
typedef enum {
libmyo_success,
libmyo_error,
libmyo_error_invalid_argument,
libmyo_error_runtime
} libmyo_result_t;
/// Opaque handle to detailed error information.
typedef void* libmyo_error_details_t;
/// Return a null-terminated string with a detailed error message.
LIBMYO_EXPORT
const char* libmyo_error_cstring(libmyo_error_details_t);
/// Returns the kind of error that occurred.
LIBMYO_EXPORT
libmyo_result_t libmyo_error_kind(libmyo_error_details_t);
/// Free the resources allocated by an error object.
LIBMYO_EXPORT
void libmyo_free_error_details(libmyo_error_details_t);
/// @}
/// @defgroup libmyo_hub Hub instance
/// @{
/// Initialize a connection to the hub.
/// \a application_identifier must follow a reverse domain name format (ex. com.domainname.appname). Application
/// identifiers can be formed from the set of alphanumeric ASCII characters (a-z, A-Z, 0-9). The hyphen (-) and
/// underscore (_) characters are permitted if they are not adjacent to a period (.) character (i.e. not at the start or
/// end of each segment), but are not permitted in the top-level domain. Application identifiers must have three or more
/// segments. For example, if a company's domain is example.com and the application is named hello-world, one could use
/// "com.example.hello-world" as a valid application identifier. \a application_identifier can be NULL or empty.
/// @returns libmyo_success if the connection is successfully established, otherwise:
/// - libmyo_error_runtime if a connection could not be established
/// - libmyo_error_invalid_argument if \a out_hub is NULL
/// - libmyo_error_invalid_argument if \a application_identifier is longer than 255 characters
/// - libmyo_error_invalid_argument if \a application_identifier is not in the proper reverse domain name format
LIBMYO_EXPORT
libmyo_result_t libmyo_init_hub(libmyo_hub_t* out_hub, const char* application_identifier,
libmyo_error_details_t* out_error);
/// Free the resources allocated to a hub.
/// @returns libmyo_success if shutdown is successful, otherwise:
/// - libmyo_error_invalid_argument if \a hub is NULL
/// - libmyo_error if \a hub is not a valid \a hub
LIBMYO_EXPORT
libmyo_result_t libmyo_shutdown_hub(libmyo_hub_t hub, libmyo_error_details_t* out_error);
/// @}
/// @defgroup libmyo_myo Myo instances
/// @{
/// Opaque type corresponding to a known Myo device.
typedef void* libmyo_myo_t;
/// Types of vibration
typedef enum {
libmyo_vibration_short,
libmyo_vibration_medium,
libmyo_vibration_long
} libmyo_vibration_type_t;
/// Vibrate the given myo.
/// Can be called when a Myo is paired.
/// @returns libmyo_success if the Myo successfully vibrated, otherwise
/// - libmyo_error_invalid_argument if \a myo is NULL
LIBMYO_EXPORT
libmyo_result_t libmyo_vibrate(libmyo_myo_t myo, libmyo_vibration_type_t type, libmyo_error_details_t* out_error);
/// Request the RSSI for a given myo.
/// Can be called when a Myo is paired. A libmyo_event_rssi event will likely be generated with the value of the RSSI.
/// @returns libmyo_success if the Myo successfully got the RSSI, otherwise
/// - libmyo_error_invalid_argument if \a myo is NULL
LIBMYO_EXPORT
libmyo_result_t libmyo_request_rssi(libmyo_myo_t myo, libmyo_error_details_t* out_error);
/// @}
/// @defgroup libmyo_poses Pose recognition.
/// @{
/// Supported poses.
typedef enum {
libmyo_pose_rest = 0, ///< Rest pose.
libmyo_pose_fist = 1, ///< User is making a fist.
libmyo_pose_wave_in = 2, ///< User has an open palm rotated towards the posterior of their wrist.
libmyo_pose_wave_out = 3, ///< User has an open palm rotated towards the anterior of their wrist.
libmyo_pose_fingers_spread = 4, ///< User has an open palm with their fingers spread away from each other.
libmyo_pose_reserved1 = 5, ///< Reserved value; not a valid pose.
libmyo_pose_thumb_to_pinky = 6, ///< User is touching the tip of their thumb to the tip of their pinky.
libmyo_num_poses, ///< Number of poses supported; not a valid pose.
libmyo_pose_unknown = 0xffff ///< Unknown pose.
} libmyo_pose_t;
static const libmyo_pose_t libmyo_trained_poses[] = { libmyo_pose_rest, libmyo_pose_fist, libmyo_pose_wave_in,
libmyo_pose_wave_out, libmyo_pose_fingers_spread,
libmyo_pose_thumb_to_pinky };
static const unsigned int libmyo_num_trained_poses = sizeof(libmyo_trained_poses) / sizeof(libmyo_trained_poses[0]);
/// @}
/// @defgroup libmyo_events Event Handling
/// @{
/// Types of events.
typedef enum {
libmyo_event_paired, ///< Successfully paired with a Myo.
libmyo_event_unpaired, ///< Successfully unpaired from a Myo.
libmyo_event_connected, ///< A Myo has successfully connected.
libmyo_event_disconnected, ///< A Myo has been disconnected.
libmyo_event_arm_recognized, ///< A Myo has recognized that it is now on an arm.
libmyo_event_arm_lost, ///< A Myo has been moved or removed from the arm.
libmyo_event_orientation, ///< Orientation data has been received.
libmyo_event_pose, ///< A change in pose has been detected. @see libmyo_pose_t.
libmyo_event_rssi, ///< An RSSI value has been received.
} libmyo_event_type_t;
/// Information about an event.
typedef const void* libmyo_event_t;
/// Retrieve the type of an event.
LIBMYO_EXPORT
uint32_t libmyo_event_get_type(libmyo_event_t event);
/// Retrieve the timestamp of an event.
/// @see libmyo_now() for details on timestamps.
LIBMYO_EXPORT
uint64_t libmyo_event_get_timestamp(libmyo_event_t event);
/// Retrieve the Myo associated with an event.
LIBMYO_EXPORT
libmyo_myo_t libmyo_event_get_myo(libmyo_event_t event);
/// Components of version.
typedef enum {
libmyo_version_major, ///< Major version.
libmyo_version_minor, ///< Minor version.
libmyo_version_patch, ///< Patch version.
libmyo_version_hardware_rev, ///< Hardware revision.
} libmyo_version_component_t;
/// Hardware revisions.
typedef enum {
libmyo_hardware_rev_c = 1, ///< Alpha units
libmyo_hardware_rev_d = 2, ///< Consumer units
} libmyo_hardware_rev_t;
/// Retrieve the Myo armband's firmware version from this event.
/// Valid for libmyo_event_paired and libmyo_event_connected events.
LIBMYO_EXPORT
unsigned int libmyo_event_get_firmware_version(libmyo_event_t event, libmyo_version_component_t);
/// Enumeration identifying a right arm or left arm. @see libmyo_event_get_arm().
typedef enum {
libmyo_arm_right, ///< Myo is on the right arm.
libmyo_arm_left, ///< Myo is on the left arm.
libmyo_arm_unknown, ///< Unknown arm.
} libmyo_arm_t;
/// Retrieve the arm associated with an event.
/// Valid for libmyo_event_arm_recognized events only.
LIBMYO_EXPORT
libmyo_arm_t libmyo_event_get_arm(libmyo_event_t event);
/// Possible directions for Myo's +x axis relative to a user's arm.
typedef enum {
libmyo_x_direction_toward_wrist, ///< Myo's +x axis is pointing toward the user's wrist.
libmyo_x_direction_toward_elbow, ///< Myo's +x axis is pointing toward the user's elbow.
libmyo_x_direction_unknown, ///< Unknown +x axis direction.
} libmyo_x_direction_t;
/// Retrieve the x-direction associated with an event.
/// The x-direction specifies which way Myo's +x axis is pointing relative to the user's arm.
/// Valid for libmyo_event_arm_recognized events only.
LIBMYO_EXPORT
libmyo_x_direction_t libmyo_event_get_x_direction(libmyo_event_t event);
/// Index into orientation data, which is provided as a quaternion.
/// Orientation data is returned as a unit quaternion of floats, represented as `w + x * i + y * j + z * k`.
typedef enum {
libmyo_orientation_x = 0, ///< First component of the quaternion's vector part
libmyo_orientation_y = 1, ///< Second component of the quaternion's vector part
libmyo_orientation_z = 2, ///< Third component of the quaternion's vector part
libmyo_orientation_w = 3, ///< Scalar component of the quaternion.
} libmyo_orientation_index;
/// Retrieve orientation data associated with an event.
/// Valid for libmyo_event_orientation events only.
/// @see libmyo_orientation_index
LIBMYO_EXPORT
float libmyo_event_get_orientation(libmyo_event_t event, libmyo_orientation_index index);
/// Retrieve raw accelerometer data associated with an event in units of g.
/// Valid for libmyo_event_orientation events only.
/// Requires `index < 3`.
LIBMYO_EXPORT
float libmyo_event_get_accelerometer(libmyo_event_t event, unsigned int index);
/// Retrieve raw gyroscope data associated with an event in units of deg/s.
/// Valid for libmyo_event_orientation events only.
/// Requires `index < 3`.
LIBMYO_EXPORT
float libmyo_event_get_gyroscope(libmyo_event_t event, unsigned int index);
/// Retrieve the pose associated with an event.
/// Valid for libmyo_event_pose events only.
LIBMYO_EXPORT
libmyo_pose_t libmyo_event_get_pose(libmyo_event_t event);
/// Retreive the RSSI associated with an event.
/// Valid for libmyo_event_rssi events only.
LIBMYO_EXPORT
int8_t libmyo_event_get_rssi(libmyo_event_t event);
/// Return type for event handlers.
typedef enum {
libmyo_handler_continue, ///< Continue processing events
libmyo_handler_stop, ///< Stop processing events
} libmyo_handler_result_t;
/// Callback function type to handle events as they occur from libmyo_run().
typedef libmyo_handler_result_t (*libmyo_handler_t)(void* user_data, libmyo_event_t event);
/// Process events and call the provided callback as they occur.
/// Runs for up to approximately \a duration_ms milliseconds or until a called handler returns libmyo_handler_stop.
/// @returns libmyo_success after a successful run, otherwise
/// - libmyo_error_invalid_argument if \a hub is NULL
/// - libmyo_error_invalid_argument if \a handler is NULL
LIBMYO_EXPORT
libmyo_result_t libmyo_run(libmyo_hub_t hub, unsigned int duration_ms, libmyo_handler_t handler, void* user_data,
libmyo_error_details_t* out_error);
/// @}
#ifdef __cplusplus
} // extern "C"
#endif
#endif // MYO_LIBMYO_H
任何人都可以帮我解决错误吗？我哪里出错了？
答案 0 :(得分：0)
我刚刚开始使用MYO，我想提一下，我开始试图让它在Cygwin中编译，这是一个非常糟糕的主意。安装程序中没有包含太多导致其失败的内容，更不用说MYO上的设置是针对visual studio的。如果你有能力这样做，我建议安装visual studio并从那里运行所有东西。在我尝试之前我遇到了很多错误，之后它对我来说非常合适。对于你发布后3个月的答案也很抱歉，但我刚开始研究类似的问题。