VS2015 + OpenCV + OnnxRuntime-Cpp + YOLOv8 部署

近期有个工作需求是进行 YOLOv8 模型的 C++ 部署，部署环境如下
1. 系统：Windows
2. IDE：VS2015
3. 语言：C++
4. OpenCV 4.5.0
5. OnnxRuntime 1.15.1

0. 预训练模型保存为 .onnx 格式

假设已经有使用 ultralytics 库训练并保存为 .pt 格式的 YOLOv8 模型，将其转换为 .onnx 格式是简单的

import os
import sys
base_path = os.path.abspath(os.path.join(os.path.dirname(__file__),))
sys.path.append(base_path)from ultralytics import YOLO# Load a YOLOv8 model
model = YOLO(f"{base_path}/model/output/best.pt")# Export the model
model.export(format="onnx", opset=9, simplify=True, dynamic=False, imgsz=640)

注意导出时设置了 opset=9，这个版本可以和 OnnxRuntime 1.15.1 匹配

除了 .onnx 模型文件以外，还需要准备数据集的 .yaml 文件和用于测试的图片

1. 依赖下载

1.1 OpenCV

在 window 上用 Cmake 从源码编译 OpenCV 很麻烦，直接下载 release 库
下载地址：OpenCV-4.5.0

下载后得到 opencv-4.5.0-vc14_vc15.exe，双击解压。把 C:\Users…\opencv\build\x64\vc14\bin 添加到环境变量。其中 vc14 对应 vs2015
提取的文件中，以下是我们之后需要的
1. 头文件：C:\Users…\opencv\build\include\opencv2
2. 动态库：C:\Users…\opencv\build\x64\vc14\bin\opencv_world450.dll
3. 静态库：C:\Users…\opencv\build\x64\vc14\lib\opencv_world450.lib & opencv_world450d.lib
  
  opencv_world450.lib 用于 vs release 模式；opencv_world450d.lib 用于 vs debug 模式

1.2 OnnxRuntime

下载地址：ONNX Runtime v1.15.1，下载 onnxruntime-win-x64-1.15.1.zip，下载后直接解压。
提取的文件中，以下是我们之后需要的
1. 头文件：C:\Users…\onnxruntime-win-x64-1.15.1\include
2. 动态库：C:\Users…\onnxruntime-win-x64-1.15.1\lib 下的所有 .dll 文件
3. 静态库：C:\Users…\onnxruntime-win-x64-1.15.1\lib 下的所有 .lib 文件

1.3 Cpp 源码

下载地址：YOLOv8 OnnxRuntime C++。这是 ultralytics 提供的官方案例，注意其依赖

由于 vs2015 无法设置 C++17 标准，后续会修改源码，去掉其中使用的 filesystem 库，由于仅部署 CPU 版本，无需 Cuda 和 cuDNN。另外这个 readme 还提到了 Cmake 编译，我们不需要做这步，直接用它的源码就行了

2. VS2015 工程配置

2.1 创建项目

首先新建 Win32 控制台项目，选择空项目。我这里项目路径为 YOLOv8-Test，项目名为 Test。打开工程根目录，新建 bin、lib、include 三个目录
- 在 bin 中粘贴 1.2 和 1.3 节提到的所有动态库文件
- 在 lib 中粘贴 1.2 和 1.3 节提到的所有静态库文件
- 在 include 中粘贴 1.2 和 1.3 节提到的所有头文件目录
  
  其中 onnxruntime-win-x64 就是 C:\Users…\onnxruntime-win-x64-1.15.1\include 文件夹
把源码粘贴到根目录，并添加到项目中

2.2 配置项目属性

在解决方案名 Test 处右键，点最下面属性，打开项目属性页。首先配置 Release 属性，平台选择 x64
- VC++目录 -> 包含目录，编辑增加以下路径
- VC++目录 -> 库目录，编辑增加以下路径
- C/C++ -> 常规 -> 附加包含目录，编辑增加以下路径。并关闭 SDL 检查
- 链接器 -> 附加库目录，编辑增加以下路径
- 链接器 -> 输入 -> 附加依赖项，编辑增加以下文件名（主要这里是Release版本所以用 opencv_world450.lib）
- 类似地配置 Debug 属性，区别仅在于最后一步链接附加依赖项写入 opencv_world450d.lib
由于 1.3 节没有对源码进行 Cmake 安装，还需要将 onnxruntime.dll 复制粘贴到编译运行后 .exe 文件的生成目录下，如 C:…\YOLOv8-Test\Test\x64\Release，以免出现链接错误

如果不想在每次编译都粘贴，可以直接把它粘贴到 C:\Windows\System32 和 C:\Windows\SysWOW64

3. 修改源码

由于 vs2015 无法使用 C++17 特征，修改 main.cpp 去掉其中对 filesystem 库的依赖，如下

#include <iostream>
#include <iomanip>
#include "inference.h"
#include <fstream>
#include <random>
#include <vector>
#include <string>
#include <dirent.h>
#include <sys/stat.h>
#include <opencv2/opencv.hpp>void Detector(YOLO_V8*& p) {std::string current_path = ".";std::string imgs_path = current_path + "/images";DIR* dir;struct dirent* ent;if ((dir = opendir(imgs_path.c_str())) != NULL) {while ((ent = readdir(dir)) != NULL) {std::string file_name = ent->d_name;if (file_name.find(".jpg") != std::string::npos || file_name.find(".png") != std::string::npos || file_name.find(".jpeg") != std::string::npos) {std::string img_path = imgs_path + "/" + file_name;cv::Mat img = cv::imread(img_path);std::vector<DL_RESULT> res;p->RunSession(img, res);for (auto& re : res) {cv::RNG rng(cv::getTickCount());cv::Scalar color(rng.uniform(0, 256), rng.uniform(0, 256), rng.uniform(0, 256));cv::rectangle(img, re.box, color, 3);float confidence = floor(100 * re.confidence) / 100;std::cout << std::fixed << std::setprecision(2);std::string label = p->classes[re.classId] + " " +std::to_string(confidence).substr(0, std::to_string(confidence).size() - 4);cv::rectangle(img,cv::Point(re.box.x, re.box.y - 25),cv::Point(re.box.x + label.length() * 15, re.box.y),color,cv::FILLED);cv::putText(img,label,cv::Point(re.box.x, re.box.y - 5),cv::FONT_HERSHEY_SIMPLEX,0.75,cv::Scalar(0, 0, 0),2);std::replace(label.begin(), label.end(), '\r', ' ');std::cout << "Target Type:   " << label << std::endl;std::cout << "Loc (x,y,w,h): " << "(" << re.box.x << "," << re.box.y << "," << re.box.width << "," << re.box.height << ")" << std::endl;}cv::Mat resized_img; double scale_factor = 5.0; // 放大倍数 cv::resize(img, resized_img, cv::Size(), scale_factor, scale_factor, cv::INTER_LINEAR); cv::imshow("Result of Detection", resized_img); std::cout << "Press any key to exit" << std::endl;//cv::imshow("Result of Detection", img);cv::waitKey(0);cv::destroyAllWindows();}}closedir(dir);}
}void Classifier(YOLO_V8*& p) {std::string current_path = ".";std::string imgs_path = current_path;std::random_device rd;std::mt19937 gen(rd());std::uniform_int_distribution<int> dis(0, 255);DIR* dir;struct dirent* ent;if ((dir = opendir(imgs_path.c_str())) != NULL) {while ((ent = readdir(dir)) != NULL) {std::string file_name = ent->d_name;if (file_name.find(".jpg") != std::string::npos || file_name.find(".png") != std::string::npos) {std::string img_path = imgs_path + "/" + file_name;cv::Mat img = cv::imread(img_path);std::vector<DL_RESULT> res;char* ret = p->RunSession(img, res);float positionY = 50;for (int i = 0; i < res.size(); i++) {int r = dis(gen);int g = dis(gen);int b = dis(gen);cv::putText(img, std::to_string(i) + ":", cv::Point(10, positionY), cv::FONT_HERSHEY_SIMPLEX, 1, cv::Scalar(b, g, r), 2);cv::putText(img, std::to_string(res.at(i).confidence), cv::Point(70, positionY), cv::FONT_HERSHEY_SIMPLEX, 1, cv::Scalar(b, g, r), 2);positionY += 50;}cv::imshow("TEST_CLS", img);cv::waitKey(0);cv::destroyAllWindows();}}closedir(dir);}
}int ReadPlaneYaml(YOLO_V8*& p) {// Open the YAML filestd::ifstream file("./cfg/plane.yaml");if (!file.is_open()) {std::cerr << "Failed to open file" << std::endl;return 1;}// Read the file line by linestd::string line;std::vector<std::string> lines;while (std::getline(file, line)) {lines.push_back(line);}// Find the start and end of the names sectionstd::size_t start = 0;std::size_t end = 0;for (std::size_t i = 0; i < lines.size(); i++) {if (lines[i].find("names:") != std::string::npos) {start = i + 1;} else if (start > 0 && lines[i].find(':') == std::string::npos) {end = i;break;}}// Extract the namesstd::vector<std::string> names;for (std::size_t i = start; i < end; i++) {std::stringstream ss(lines[i]);std::string name;std::getline(ss, name, ':'); // Extract the number before the delimiterstd::getline(ss, name); // Extract the string after the delimiternames.push_back(name);}p->classes = names;return 0;
}void DetectTest() {YOLO_V8* yoloDetector = new YOLO_V8;ReadPlaneYaml(yoloDetector);DL_INIT_PARAM params;params.rectConfidenceThreshold = 0.1;params.iouThreshold = 0.5;params.modelPath = "./model/best.onnx";params.imgSize = { 640, 640 };
#ifdef USE_CUDAparams.cudaEnable = true;// GPU FP32 inferenceparams.modelType = YOLO_DETECT_V8;// GPU FP16 inference//Note: change fp16 onnx model//params.modelType = YOLO_DETECT_V8_HALF;#else// CPU inferenceparams.modelType = YOLO_DETECT_V8;params.cudaEnable = false;#endifyoloDetector->CreateSession(params);Detector(yoloDetector);
}// void ClsTest() {
//     YOLO_V8* yoloDetector = new YOLO_V8;
//     std::string model_path = "cls.onnx";
//     ReadPlaneYaml(yoloDetector);
//     DL_INIT_PARAM params{ model_path, YOLO_CLS, {224, 224} };
//     yoloDetector->CreateSession(params);
//     Classifier(yoloDetector);
// }int main() {DetectTest();//ClsTest();
}

以上代码使用了 dirent.h 中封装的 windows 文件读写方法，如果 vs 报错找不到这个头文件，则自己创建该文件，放置于 vs 安装路径，我这是 D:\Programmer\Microsoft Visual Studio 14.0\VC\include

/** Dirent interface for Microsoft Visual Studio** Copyright (C) 1998-2019 Toni Ronkko* This file is part of dirent.  Dirent may be freely distributed* under the MIT license.  For all details and documentation, see* https://github.com/tronkko/dirent*/
#ifndef DIRENT_H
#define DIRENT_H/* Hide warnings about unreferenced local functions */
#if defined(__clang__)
#   pragma clang diagnostic ignored "-Wunused-function"
#elif defined(_MSC_VER)
#   pragma warning(disable:4505)
#elif defined(__GNUC__)
#   pragma GCC diagnostic ignored "-Wunused-function"
#endif/** Include windows.h without Windows Sockets 1.1 to prevent conflicts with* Windows Sockets 2.0.*/
#ifndef WIN32_LEAN_AND_MEAN
#   define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>#include <stdio.h>
#include <stdarg.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>/* Indicates that d_type field is available in dirent structure */
#define _DIRENT_HAVE_D_TYPE/* Indicates that d_namlen field is available in dirent structure */
#define _DIRENT_HAVE_D_NAMLEN/* Entries missing from MSVC 6.0 */
#if !defined(FILE_ATTRIBUTE_DEVICE)
#   define FILE_ATTRIBUTE_DEVICE 0x40
#endif/* File type and permission flags for stat(), general mask */
#if !defined(S_IFMT)
#   define S_IFMT _S_IFMT
#endif/* Directory bit */
#if !defined(S_IFDIR)
#   define S_IFDIR _S_IFDIR
#endif/* Character device bit */
#if !defined(S_IFCHR)
#   define S_IFCHR _S_IFCHR
#endif/* Pipe bit */
#if !defined(S_IFFIFO)
#   define S_IFFIFO _S_IFFIFO
#endif/* Regular file bit */
#if !defined(S_IFREG)
#   define S_IFREG _S_IFREG
#endif/* Read permission */
#if !defined(S_IREAD)
#   define S_IREAD _S_IREAD
#endif/* Write permission */
#if !defined(S_IWRITE)
#   define S_IWRITE _S_IWRITE
#endif/* Execute permission */
#if !defined(S_IEXEC)
#   define S_IEXEC _S_IEXEC
#endif/* Pipe */
#if !defined(S_IFIFO)
#   define S_IFIFO _S_IFIFO
#endif/* Block device */
#if !defined(S_IFBLK)
#   define S_IFBLK 0
#endif/* Link */
#if !defined(S_IFLNK)
#   define S_IFLNK 0
#endif/* Socket */
#if !defined(S_IFSOCK)
#   define S_IFSOCK 0
#endif/* Read user permission */
#if !defined(S_IRUSR)
#   define S_IRUSR S_IREAD
#endif/* Write user permission */
#if !defined(S_IWUSR)
#   define S_IWUSR S_IWRITE
#endif/* Execute user permission */
#if !defined(S_IXUSR)
#   define S_IXUSR 0
#endif/* Read group permission */
#if !defined(S_IRGRP)
#   define S_IRGRP 0
#endif/* Write group permission */
#if !defined(S_IWGRP)
#   define S_IWGRP 0
#endif/* Execute group permission */
#if !defined(S_IXGRP)
#   define S_IXGRP 0
#endif/* Read others permission */
#if !defined(S_IROTH)
#   define S_IROTH 0
#endif/* Write others permission */
#if !defined(S_IWOTH)
#   define S_IWOTH 0
#endif/* Execute others permission */
#if !defined(S_IXOTH)
#   define S_IXOTH 0
#endif/* Maximum length of file name */
#if !defined(PATH_MAX)
#   define PATH_MAX MAX_PATH
#endif
#if !defined(FILENAME_MAX)
#   define FILENAME_MAX MAX_PATH
#endif
#if !defined(NAME_MAX)
#   define NAME_MAX FILENAME_MAX
#endif/* File type flags for d_type */
#define DT_UNKNOWN 0
#define DT_REG S_IFREG
#define DT_DIR S_IFDIR
#define DT_FIFO S_IFIFO
#define DT_SOCK S_IFSOCK
#define DT_CHR S_IFCHR
#define DT_BLK S_IFBLK
#define DT_LNK S_IFLNK/* Macros for converting between st_mode and d_type */
#define IFTODT(mode) ((mode) & S_IFMT)
#define DTTOIF(type) (type)/** File type macros.  Note that block devices, sockets and links cannot be* distinguished on Windows and the macros S_ISBLK, S_ISSOCK and S_ISLNK are* only defined for compatibility.  These macros should always return false* on Windows.*/
#if !defined(S_ISFIFO)
#   define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
#endif
#if !defined(S_ISDIR)
#   define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
#if !defined(S_ISREG)
#   define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
#if !defined(S_ISLNK)
#   define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
#endif
#if !defined(S_ISSOCK)
#   define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
#endif
#if !defined(S_ISCHR)
#   define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
#endif
#if !defined(S_ISBLK)
#   define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
#endif/* Return the exact length of the file name without zero terminator */
#define _D_EXACT_NAMLEN(p) ((p)->d_namlen)/* Return the maximum size of a file name */
#define _D_ALLOC_NAMLEN(p) ((PATH_MAX)+1)#ifdef __cplusplus
extern "C" {
#endif/* Wide-character version */
struct _wdirent {/* Always zero */long d_ino;/* File position within stream */long d_off;/* Structure size */unsigned short d_reclen;/* Length of name without \0 */size_t d_namlen;/* File type */int d_type;/* File name */wchar_t d_name[PATH_MAX+1];
};
typedef struct _wdirent _wdirent;struct _WDIR {/* Current directory entry */struct _wdirent ent;/* Private file data */WIN32_FIND_DATAW data;/* True if data is valid */int cached;/* Win32 search handle */HANDLE handle;/* Initial directory name */wchar_t *patt;
};
typedef struct _WDIR _WDIR;/* Multi-byte character version */
struct dirent {/* Always zero */long d_ino;/* File position within stream */long d_off;/* Structure size */unsigned short d_reclen;/* Length of name without \0 */size_t d_namlen;/* File type */int d_type;/* File name */char d_name[PATH_MAX+1];
};
typedef struct dirent dirent;struct DIR {struct dirent ent;struct _WDIR *wdirp;
};
typedef struct DIR DIR;/* Dirent functions */
static DIR *opendir (const char *dirname);
static _WDIR *_wopendir (const wchar_t *dirname);static struct dirent *readdir (DIR *dirp);
static struct _wdirent *_wreaddir (_WDIR *dirp);static int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
static int _wreaddir_r(_WDIR *dirp, struct _wdirent *entry, struct _wdirent **result);static int closedir (DIR *dirp);
static int _wclosedir (_WDIR *dirp);static void rewinddir (DIR* dirp);
static void _wrewinddir (_WDIR* dirp);static int scandir (const char *dirname, struct dirent ***namelist,int (*filter)(const struct dirent*),int (*compare)(const struct dirent**, const struct dirent**));static int alphasort (const struct dirent **a, const struct dirent **b);static int versionsort (const struct dirent **a, const struct dirent **b);/* For compatibility with Symbian */
#define wdirent _wdirent
#define WDIR _WDIR
#define wopendir _wopendir
#define wreaddir _wreaddir
#define wclosedir _wclosedir
#define wrewinddir _wrewinddir/* Internal utility functions */
static WIN32_FIND_DATAW *dirent_first (_WDIR *dirp);
static WIN32_FIND_DATAW *dirent_next (_WDIR *dirp);static int dirent_mbstowcs_s(size_t *pReturnValue,wchar_t *wcstr,size_t sizeInWords,const char *mbstr,size_t count);static int dirent_wcstombs_s(size_t *pReturnValue,char *mbstr,size_t sizeInBytes,const wchar_t *wcstr,size_t count);static void dirent_set_errno (int error);/** Open directory stream DIRNAME for read and return a pointer to the* internal working area that is used to retrieve individual directory* entries.*/
static _WDIR*
_wopendir(const wchar_t *dirname)
{_WDIR *dirp;DWORD n;wchar_t *p;/* Must have directory name */if (dirname == NULL  ||  dirname[0] == '\0') {dirent_set_errno (ENOENT);return NULL;}/* Allocate new _WDIR structure */dirp = (_WDIR*) malloc (sizeof (struct _WDIR));if (!dirp) {return NULL;}/* Reset _WDIR structure */dirp->handle = INVALID_HANDLE_VALUE;dirp->patt = NULL;dirp->cached = 0;/** Compute the length of full path plus zero terminator** Note that on WinRT there's no way to convert relative paths* into absolute paths, so just assume it is an absolute path.*/
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)/* Desktop */n = GetFullPathNameW (dirname, 0, NULL, NULL);
#else/* WinRT */n = wcslen (dirname);
#endif/* Allocate room for absolute directory name and search pattern */dirp->patt = (wchar_t*) malloc (sizeof (wchar_t) * n + 16);if (dirp->patt == NULL) {goto exit_closedir;}/** Convert relative directory name to an absolute one.  This* allows rewinddir() to function correctly even when current* working directory is changed between opendir() and rewinddir().** Note that on WinRT there's no way to convert relative paths* into absolute paths, so just assume it is an absolute path.*/
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)/* Desktop */n = GetFullPathNameW (dirname, n, dirp->patt, NULL);if (n <= 0) {goto exit_closedir;}
#else/* WinRT */wcsncpy_s (dirp->patt, n+1, dirname, n);
#endif/* Append search pattern \* to the directory name */p = dirp->patt + n;switch (p[-1]) {case '\\':case '/':case ':':/* Directory ends in path separator, e.g. c:\temp\ *//*NOP*/;break;default:/* Directory name doesn't end in path separator */*p++ = '\\';}*p++ = '*';*p = '\0';/* Open directory stream and retrieve the first entry */if (!dirent_first (dirp)) {goto exit_closedir;}/* Success */return dirp;/* Failure */
exit_closedir:_wclosedir (dirp);return NULL;
}/** Read next directory entry.** Returns pointer to static directory entry which may be overwritten by* subsequent calls to _wreaddir().*/
static struct _wdirent*
_wreaddir(_WDIR *dirp)
{struct _wdirent *entry;/** Read directory entry to buffer.  We can safely ignore the return value* as entry will be set to NULL in case of error.*/(void) _wreaddir_r (dirp, &dirp->ent, &entry);/* Return pointer to statically allocated directory entry */return entry;
}/** Read next directory entry.** Returns zero on success.  If end of directory stream is reached, then sets* result to NULL and returns zero.*/
static int
_wreaddir_r(_WDIR *dirp,struct _wdirent *entry,struct _wdirent **result)
{WIN32_FIND_DATAW *datap;/* Read next directory entry */datap = dirent_next (dirp);if (datap) {size_t n;DWORD attr;/** Copy file name as wide-character string.  If the file name is too* long to fit in to the destination buffer, then truncate file name* to PATH_MAX characters and zero-terminate the buffer.*/n = 0;while (n < PATH_MAX  &&  datap->cFileName[n] != 0) {entry->d_name[n] = datap->cFileName[n];n++;}entry->d_name[n] = 0;/* Length of file name excluding zero terminator */entry->d_namlen = n;/* File type */attr = datap->dwFileAttributes;if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {entry->d_type = DT_CHR;} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {entry->d_type = DT_DIR;} else {entry->d_type = DT_REG;}/* Reset dummy fields */entry->d_ino = 0;entry->d_off = 0;entry->d_reclen = sizeof (struct _wdirent);/* Set result address */*result = entry;} else {/* Return NULL to indicate end of directory */*result = NULL;}return /*OK*/0;
}/** Close directory stream opened by opendir() function.  This invalidates the* DIR structure as well as any directory entry read previously by* _wreaddir().*/
static int
_wclosedir(_WDIR *dirp)
{int ok;if (dirp) {/* Release search handle */if (dirp->handle != INVALID_HANDLE_VALUE) {FindClose (dirp->handle);}/* Release search pattern */free (dirp->patt);/* Release directory structure */free (dirp);ok = /*success*/0;} else {/* Invalid directory stream */dirent_set_errno (EBADF);ok = /*failure*/-1;}return ok;
}/** Rewind directory stream such that _wreaddir() returns the very first* file name again.*/
static void
_wrewinddir(_WDIR* dirp)
{if (dirp) {/* Release existing search handle */if (dirp->handle != INVALID_HANDLE_VALUE) {FindClose (dirp->handle);}/* Open new search handle */dirent_first (dirp);}
}/* Get first directory entry (internal) */
static WIN32_FIND_DATAW*
dirent_first(_WDIR *dirp)
{WIN32_FIND_DATAW *datap;DWORD error;/* Open directory and retrieve the first entry */dirp->handle = FindFirstFileExW(dirp->patt, FindExInfoStandard, &dirp->data,FindExSearchNameMatch, NULL, 0);if (dirp->handle != INVALID_HANDLE_VALUE) {/* a directory entry is now waiting in memory */datap = &dirp->data;dirp->cached = 1;} else {/* Failed to open directory: no directory entry in memory */dirp->cached = 0;datap = NULL;/* Set error code */error = GetLastError ();switch (error) {case ERROR_ACCESS_DENIED:/* No read access to directory */dirent_set_errno (EACCES);break;case ERROR_DIRECTORY:/* Directory name is invalid */dirent_set_errno (ENOTDIR);break;case ERROR_PATH_NOT_FOUND:default:/* Cannot find the file */dirent_set_errno (ENOENT);}}return datap;
}/** Get next directory entry (internal).** Returns*/
static WIN32_FIND_DATAW*
dirent_next(_WDIR *dirp)
{WIN32_FIND_DATAW *p;/* Get next directory entry */if (dirp->cached != 0) {/* A valid directory entry already in memory */p = &dirp->data;dirp->cached = 0;} else if (dirp->handle != INVALID_HANDLE_VALUE) {/* Get the next directory entry from stream */if (FindNextFileW (dirp->handle, &dirp->data) != FALSE) {/* Got a file */p = &dirp->data;} else {/* The very last entry has been processed or an error occurred */FindClose (dirp->handle);dirp->handle = INVALID_HANDLE_VALUE;p = NULL;}} else {/* End of directory stream reached */p = NULL;}return p;
}/** Open directory stream using plain old C-string.*/
static DIR*
opendir(const char *dirname)
{struct DIR *dirp;/* Must have directory name */if (dirname == NULL  ||  dirname[0] == '\0') {dirent_set_errno (ENOENT);return NULL;}/* Allocate memory for DIR structure */dirp = (DIR*) malloc (sizeof (struct DIR));if (!dirp) {return NULL;}{int error;wchar_t wname[PATH_MAX + 1];size_t n;/* Convert directory name to wide-character string */error = dirent_mbstowcs_s(&n, wname, PATH_MAX + 1, dirname, PATH_MAX + 1);if (error) {/** Cannot convert file name to wide-character string.  This* occurs if the string contains invalid multi-byte sequences or* the output buffer is too small to contain the resulting* string.*/goto exit_free;}/* Open directory stream using wide-character name */dirp->wdirp = _wopendir (wname);if (!dirp->wdirp) {goto exit_free;}}/* Success */return dirp;/* Failure */
exit_free:free (dirp);return NULL;
}/** Read next directory entry.*/
static struct dirent*
readdir(DIR *dirp)
{struct dirent *entry;/** Read directory entry to buffer.  We can safely ignore the return value* as entry will be set to NULL in case of error.*/(void) readdir_r (dirp, &dirp->ent, &entry);/* Return pointer to statically allocated directory entry */return entry;
}/** Read next directory entry into called-allocated buffer.** Returns zero on success.  If the end of directory stream is reached, then* sets result to NULL and returns zero.*/
static int
readdir_r(DIR *dirp,struct dirent *entry,struct dirent **result)
{WIN32_FIND_DATAW *datap;/* Read next directory entry */datap = dirent_next (dirp->wdirp);if (datap) {size_t n;int error;/* Attempt to convert file name to multi-byte string */error = dirent_wcstombs_s(&n, entry->d_name, PATH_MAX + 1, datap->cFileName, PATH_MAX + 1);/** If the file name cannot be represented by a multi-byte string,* then attempt to use old 8+3 file name.  This allows traditional* Unix-code to access some file names despite of unicode* characters, although file names may seem unfamiliar to the user.** Be ware that the code below cannot come up with a short file* name unless the file system provides one.  At least* VirtualBox shared folders fail to do this.*/if (error  &&  datap->cAlternateFileName[0] != '\0') {error = dirent_wcstombs_s(&n, entry->d_name, PATH_MAX + 1,datap->cAlternateFileName, PATH_MAX + 1);}if (!error) {DWORD attr;/* Length of file name excluding zero terminator */entry->d_namlen = n - 1;/* File attributes */attr = datap->dwFileAttributes;if ((attr & FILE_ATTRIBUTE_DEVICE) != 0) {entry->d_type = DT_CHR;} else if ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) {entry->d_type = DT_DIR;} else {entry->d_type = DT_REG;}/* Reset dummy fields */entry->d_ino = 0;entry->d_off = 0;entry->d_reclen = sizeof (struct dirent);} else {/** Cannot convert file name to multi-byte string so construct* an erroneous directory entry and return that.  Note that* we cannot return NULL as that would stop the processing* of directory entries completely.*/entry->d_name[0] = '?';entry->d_name[1] = '\0';entry->d_namlen = 1;entry->d_type = DT_UNKNOWN;entry->d_ino = 0;entry->d_off = -1;entry->d_reclen = 0;}/* Return pointer to directory entry */*result = entry;} else {/* No more directory entries */*result = NULL;}return /*OK*/0;
}/** Close directory stream.*/
static int
closedir(DIR *dirp)
{int ok;if (dirp) {/* Close wide-character directory stream */ok = _wclosedir (dirp->wdirp);dirp->wdirp = NULL;/* Release multi-byte character version */free (dirp);} else {/* Invalid directory stream */dirent_set_errno (EBADF);ok = /*failure*/-1;}return ok;
}/** Rewind directory stream to beginning.*/
static void
rewinddir(DIR* dirp)
{/* Rewind wide-character string directory stream */_wrewinddir (dirp->wdirp);
}/** Scan directory for entries.*/
static int
scandir(const char *dirname,struct dirent ***namelist,int (*filter)(const struct dirent*),int (*compare)(const struct dirent**, const struct dirent**))
{struct dirent **files = NULL;size_t size = 0;size_t allocated = 0;const size_t init_size = 1;DIR *dir = NULL;struct dirent *entry;struct dirent *tmp = NULL;size_t i;int result = 0;/* Open directory stream */dir = opendir (dirname);if (dir) {/* Read directory entries to memory */while (1) {/* Enlarge pointer table to make room for another pointer */if (size >= allocated) {void *p;size_t num_entries;/* Compute number of entries in the enlarged pointer table */if (size < init_size) {/* Allocate initial pointer table */num_entries = init_size;} else {/* Double the size */num_entries = size * 2;}/* Allocate first pointer table or enlarge existing table */p = realloc (files, sizeof (void*) * num_entries);if (p != NULL) {/* Got the memory */files = (dirent**) p;allocated = num_entries;} else {/* Out of memory */result = -1;break;}}/* Allocate room for temporary directory entry */if (tmp == NULL) {tmp = (struct dirent*) malloc (sizeof (struct dirent));if (tmp == NULL) {/* Cannot allocate temporary directory entry */result = -1;break;}}/* Read directory entry to temporary area */if (readdir_r (dir, tmp, &entry) == /*OK*/0) {/* Did we get an entry? */if (entry != NULL) {int pass;/* Determine whether to include the entry in result */if (filter) {/* Let the filter function decide */pass = filter (tmp);} else {/* No filter function, include everything */pass = 1;}if (pass) {/* Store the temporary entry to pointer table */files[size++] = tmp;tmp = NULL;/* Keep up with the number of files */result++;}} else {/** End of directory stream reached => sort entries and* exit.*/qsort (files, size, sizeof (void*),(int (*) (const void*, const void*)) compare);break;}} else {/* Error reading directory entry */result = /*Error*/ -1;break;}}} else {/* Cannot open directory */result = /*Error*/ -1;}/* Release temporary directory entry */free (tmp);/* Release allocated memory on error */if (result < 0) {for (i = 0; i < size; i++) {free (files[i]);}free (files);files = NULL;}/* Close directory stream */if (dir) {closedir (dir);}/* Pass pointer table to caller */if (namelist) {*namelist = files;}return result;
}/* Alphabetical sorting */
static int
alphasort(const struct dirent **a, const struct dirent **b)
{return strcoll ((*a)->d_name, (*b)->d_name);
}/* Sort versions */
static int
versionsort(const struct dirent **a, const struct dirent **b)
{/* FIXME: implement strverscmp and use that */return alphasort (a, b);
}/* Convert multi-byte string to wide character string */
static int
dirent_mbstowcs_s(size_t *pReturnValue,wchar_t *wcstr,size_t sizeInWords,const char *mbstr,size_t count)
{int error;#if defined(_MSC_VER)  &&  _MSC_VER >= 1400/* Microsoft Visual Studio 2005 or later */error = mbstowcs_s (pReturnValue, wcstr, sizeInWords, mbstr, count);#else/* Older Visual Studio or non-Microsoft compiler */size_t n;/* Convert to wide-character string (or count characters) */n = mbstowcs (wcstr, mbstr, sizeInWords);if (!wcstr  ||  n < count) {/* Zero-terminate output buffer */if (wcstr  &&  sizeInWords) {if (n >= sizeInWords) {n = sizeInWords - 1;}wcstr[n] = 0;}/* Length of resulting multi-byte string WITH zero terminator */if (pReturnValue) {*pReturnValue = n + 1;}/* Success */error = 0;} else {/* Could not convert string */error = 1;}#endifreturn error;
}/* Convert wide-character string to multi-byte string */
static int
dirent_wcstombs_s(size_t *pReturnValue,char *mbstr,size_t sizeInBytes, /* max size of mbstr */const wchar_t *wcstr,size_t count)
{int error;#if defined(_MSC_VER)  &&  _MSC_VER >= 1400/* Microsoft Visual Studio 2005 or later */error = wcstombs_s (pReturnValue, mbstr, sizeInBytes, wcstr, count);#else/* Older Visual Studio or non-Microsoft compiler */size_t n;/* Convert to multi-byte string (or count the number of bytes needed) */n = wcstombs (mbstr, wcstr, sizeInBytes);if (!mbstr  ||  n < count) {/* Zero-terminate output buffer */if (mbstr  &&  sizeInBytes) {if (n >= sizeInBytes) {n = sizeInBytes - 1;}mbstr[n] = '\0';}/* Length of resulting multi-bytes string WITH zero-terminator */if (pReturnValue) {*pReturnValue = n + 1;}/* Success */error = 0;} else {/* Cannot convert string */error = 1;}#endifreturn error;
}/* Set errno variable */
static void
dirent_set_errno(int error)
{
#if defined(_MSC_VER)  &&  _MSC_VER >= 1400/* Microsoft Visual Studio 2005 and later */_set_errno (error);#else/* Non-Microsoft compiler or older Microsoft compiler */errno = error;#endif
}#ifdef __cplusplus
}
#endif
#endif /*DIRENT_H*/

注意以上写死了模型路径为 ./model/best.onnx，数据配置文件路径为 ./cfg/plane.yaml，测试图像放在 ./images 路径下。将这些资源放到编译后生成的 C:\Users…\YOLOv8-Test\Test\x64\Release（或Debug）目录下

现在双击 Test.exe 就能看到 YOLOv8 的识别结果了
最后的问题是，如果在 vscode 里点击运行，还是会报错找不到资源，这是因为工作目录还在根目录，修改属性页->调试 -> 工作目录为 $(OutDir) 即可