C++ 错误LNK2019:未解析的外部符号opencv
我编写了这个简单的程序，从txt文件加载矩阵并计算距离。 在windows上的visual studio中编译程序时，我遇到以下错误：C++ 错误LNK2019:未解析的外部符号opencv,c++,visual-studio-2010,opencv,C++,Visual Studio 2010,Opencv,我编写了这个简单的程序，从txt文件加载矩阵并计算距离。 在windows上的visual studio中编译程序时，我遇到以下错误： 1>main.obj : error LNK2019: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?fastFree@cv@@YAXPAX@Z) referenced in function "public: __thiscall cv::Mat::~Mat(vo
1>main.obj : error LNK2019: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?fastFree@cv@@YAXPAX@Z) referenced in function "public: __thiscall cv::Mat::~Mat(void)" (??1Mat@cv@@QAE@XZ)
1>system.obj : error LNK2001: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?fastFree@cv@@YAXPAX@Z)
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ) referenced in function "public: void __thiscall cv::Mat::release(void)" (?release@Mat@cv@@QAEXXZ)
1>system.obj : error LNK2001: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?deallocate@Mat@cv@@QAEXXZ)
1>main.obj : error LNK2019: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@YAHPAHH@Z) referenced in function "public: void __thiscall cv::Mat::release(void)" (?release@Mat@cv@@QAEXXZ)
1>system.obj : error LNK2001: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@YAHPAHH@Z)
1>system.obj : error LNK2019: unresolved external symbol "public: __thiscall cv::Exception::Exception(int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (??0Exception@cv@@QAE@HABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00H@Z) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??$at@H@Mat@cv@@QAEAAHHH@Z)
1>system.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall cv::Exception::~Exception(void)" (??1Exception@cv@@UAE@XZ) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??$at@H@Mat@cv@@QAEAAHHH@Z)
1>system.obj : error LNK2019: unresolved external symbol "void __cdecl cv::error(class cv::Exception const &)" (?error@cv@@YAXABVException@1@@Z) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??$at@H@Mat@cv@@QAEAAHHH@Z)
1>system.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::create(int,int const *,int)" (?create@Mat@cv@@QAEXHPBHH@Z) referenced in function "public: void __thiscall cv::Mat::create(int,int,int)" (?create@Mat@cv@@QAEXHHH@Z)
1>C:\Users\Ram\documents\visual studio 2012\Projects\descrip\Debug\descrip.exe : fatal error LNK1120: 7 unresolved externals
1>main.obj:错误LNK2019:未解析的外部符号“void u cdecl cv:：fastFree（void*）”（？fastFree@cv@@YAXPAX@Z)在函数“public:u thiscall cv:：Mat:：~Mat（void）”中引用（？）？？1Mat@cv@@QAE@XZ)
1> system.obj:错误LNK2001:未解析的外部符号“void u cdecl cv:：fastFree（void*）”（？fastFree@cv@@YAXPAX@Z)
1> main.obj:错误LNK2019:未解析的外部符号“public:void\uu thiscall cv:：Mat:：deallocate（void）”（？deallocate@Mat@函数“public:void\uu thiscall cv:：Mat:：release（void）”（？release@Mat@cv@@QAEXXZ）
1> system.obj:错误LNK2001:未解析的外部符号“public:void u thiscall cv:：Mat:：deallocate（void）”（？deallocate@Mat@cv@@QAEXXZ）
1> main.obj:错误LNK2019:未解析的外部符号“int u cdecl cv:：_interlockedExchangeAdd（int*，int）”（_interlockedExchangeAdd@cv@@YAHPAHH@Z)在函数“public:void u thiscall cv:：Mat:：release（void）”中引用（？release@Mat@cv@@QAEXXZ）
1> system.obj:错误LNK2001:未解析的外部符号“int uu cdecl cv:：_InterlocatedExchangeAdd（int*，int）”（_interlockedExchangeAdd@cv@@YAHPAHH@Z)
1> system.obj:错误LNK2019:未解析的外部符号“public:u thiscall cv:：Exception:：Exception（int，class std:：basic_string const&，class std:：basic_string const&，class std:：basic_string const&，int）”（？？0Exception@cv@@QAE@HABV？$basic_string@DU？$char_traits@D@性病病毒$allocator@D@2@@std@@00H@Z)在函数中引用“public:int&u thiscall cv:：Mat:：at（int，int）”（$at@H@Mat@cv@@QAEAAHHH@Z)
1> system.obj:错误LNK2019:未解析的外部符号“public:virtual\u thiscall cv:：Exception:：~Exception（void）”（？）？？1Exception@cv@@UAE@XZ)在函数“public:int&u thiscall cv:：Mat:：at（int，int）”中引用（？）$at@H@Mat@cv@@QAEAAHHH@Z)
1> system.obj:错误LNK2019:未解析的外部符号“void u cdecl cv:：error（类cv:：Exception const&）”（？error@cv@@YAXABVException@1@@Z） 在函数“public:int&u thiscall cv:：Mat:：at（int，int）”中引用（？）$at@H@Mat@cv@@QAEAAHHH@Z)
1> system.obj:错误LNK2019:未解析的外部符号“public:void\uu thiscall cv:：Mat:：create（int，int const*，int）”（？create@Mat@简历@@QAEXHPBHH@Z)函数“public:void\uu thiscall cv:：Mat:：create（int，int，int）”中引用（？create@Mat@简历@@QAEXHHH@Z)
1> C:\Users\Ram\documents\visual studio 2012\Projects\descripp\Debug\descripp.exe:致命错误LNK1120:7个未解析的外部
#include "system.h"
using namespace std;
int main(int argc, char* argv[]){
if(argc != 3){
cout << "Not enough arguments" << endl;
exit(-1);
}
System s(argv[2]);
s.Parse_Centers(argv[1]);
s.Run();
return 0;
}
#包括“system.h”
使用名称空间std；
intmain（intargc，char*argv[]）{
如果（argc！=3）{
您可能包含了正确的头文件，但忘记添加库。您需要在项目设置中添加相应的*.lib文件。与前面提到的其他文件一样，您需要确保正确链接到OpenCV库
检查您的项目->属性->VC++目录->库目录，包括OpenCV库所在的路径，默认为“C:\OpenCV\build\x86\vc11\lib”（在运行VS2012的32位计算机上，其他设置会有所不同）
接下来，检查项目->属性->链接器->输入->其他依赖项中是否包含以下库：
opencv_core246d.lib
opencv_imgproc246d.lib
opencv_highgui246d.lib
opencv_ml246d.lib
opencv\u video246d.lib
opencv_特性2d246d.lib
opencv_calib346d.lib
opencv_objdetect246d.lib
opencv_contrib246d.lib
opencv_legacy246d.lib
opencv_flann246d.lib
如果以上所述是正确的，则不应再出现任何OpenCV链接错误。也许您正在为win32构建，但链接到x64。如果您将应用程序设置为x64，则它将进行构建，而在win32中，它会出现链接错误。右键单击解决方案并转到“配置”、“平台”列。我发现设置此项很棘手，我想知道是否需要进行设置是否有问题。所有答案都指向正确的方向，但我想更新截至今天（4.0.0）的最新版本的答案，更改他提到的库：
opencv_core400d.lib
opencv_imgproc400d.lib
opencv_highgui400d.lib
opencv_ml400d.lib
opencv\u video400d.lib
opencv_功能2d400d.lib
opencv_calib3d400d.lib
opencv_objdetect400d.lib
opencv_flann400d.lib
对于下一个或上一个版本，只需转到opencv目录中的lib文件夹，搜索我提供的列表中的每个项目（显然，复制并粘贴到版本号之前的最后一个字母，在我的例子中是400），然后为链接器创建自己的附加依赖项列表
顺便说一句，我必须使用CMake从源代码中创建Visual Studio.sln，使用VS构建，然后由于某些原因，源代码中没有包含文件，因此我从添加到包含目录中。按照步骤解决它
- 转到项目右键单击并选择设置->C++->常规->其他包含目录单击编辑并添加此C:\opencv\build\include
- 现在转到设置->链接器->常规->附加库目录并粘贴C:\opencv\build\x64\vc15\lib
- 现在转到设置->链接器->输入并粘贴opencv_world343.lib、opencv_world343d.lib
仅此而已，但对于visual studio 2017和OpenCV 3.4.3，这些设置是正确的，只有其他版本的设置需要相应更改
对于我的情况，无论如何配置visual studio解决方案上的include/library路径和库文件，我都无法删除_interlockedExchangeAdd链接错误
所以我创建了新的VisualStudio解决方案，并添加了include/library路径、库输入文件（opencv_world440.lib）。
W
#include <iostream>
#include <fstream>
#include <dirent.h>
#include <time.h>
#include "cv.h"
#include "highgui.h"
#include "opencv2/opencv.hpp"
#define NUM_CENTERS 5000
#define NUM_COL 512
using namespace cv;
class System{
public:
System(char *dir);
void Run();
void Parse_Centers(char* path);
void Compute_Histogram(const char* filename);
private:
Mat centers;
Mat centers_zero;
char *dir_path;
};
#include "system.h"
using namespace std;
using namespace cv;
System::System(char *dir){
centers.create(NUM_CENTERS, NUM_COL, CV_8U);
centers_zero.create(NUM_CENTERS, NUM_COL, CV_8U);
dir_path = dir;
};
void System::Parse_Centers(char* path){
ifstream fin;
int temp, n, line = 0;
fin.open(path);
if(!fin.good()){
throw 1;
}
while(!fin.eof()){
char buf[2048];
const char* token[NUM_COL] = {};
n = 0;
fin.getline(buf, 2048);
token[0] = strtok(buf, ",");
if(token[0]){
temp = atoi(token[0]);
if(temp){
centers.at<int>(line,n) = temp;
centers_zero.at<int>(line,n) = temp * temp;
}
for(int n = 1; n < 512; n++){
token[n] = strtok(0, ",");
temp = atoi(token[n]);
if(temp){
centers.at<int>(line,n) = temp;
centers_zero.at<int>(line,n) = temp * temp;
}
}
}
line++;
}
fin.close();
};
void System::Run(){
DIR *dir;
struct dirent *entry;
time_t start_t;
time_t end_t;
dir = opendir(dir_path);
if(!dir){
cout << "Directory wasn't found" << endl;
throw 3;
}
while((entry = readdir(dir)) != NULL){
if(entry->d_name[0] != '.'){
string path = string(dir_path) + "/" + string(entry->d_name);
cout << "entry: " << path;
time(&start_t);
Compute_Histogram(path.c_str());
time(&end_t);
cout << " " << difftime(start_t,end_t) << "sec" << endl;
}
}
closedir(dir);
}
void System::Compute_Histogram(const char* filename){
int dist[NUM_CENTERS];
int desc[NUM_CENTERS] = {0};
int temp, place = 0;
ifstream fin;
fin.open(filename);
if(!fin.good()){
throw 2;
}
while(!fin.eof()){
char buf[2048];
const char* token[512] = {};
fin.getline(buf, 2048);
token[0] = strtok(buf, ",");
if(token[0]){
temp = atoi(token[0]);
if(temp){
for(int i = 0; i < NUM_CENTERS; i++){
dist[i] = (temp - centers.at<int>(i,0)) * (temp - centers.at<int>(i,0));
}
}
else{
for(int i = 0; i < NUM_CENTERS; i++){
dist[i] = centers_zero.at<int>(i,0);
}
}
for(int n = 1; n < NUM_COL; n++){
token[n] = strtok(0, ",");
temp = atoi(token[n]);
if(temp){
for(int i = 0; i < NUM_CENTERS; i++){
dist[i] += (temp - centers.at<int>(i,n)) * (temp - centers.at<int>(i,n));
if((n == 511) && (i > 0)){
if(dist[i] < dist[place]){
place = i;
}
}
}
}
else{
for(int i = 0; i < NUM_CENTERS; i++){
dist[i] += centers_zero.at<int>(i,n);
if((n == 511) && (i > 0)){
if(dist[i] < dist[place]){
place = i;
}
}
}
}
}
}
desc[place]++;
}
fin.close();
ofstream outfile;
string path;
path = string(filename) + ".csv";
outfile.open(path.c_str());
for(int i = 0; i < 4999; i++){
outfile << desc[i] << ",";
}
outfile << desc[4999];
outfile.close();
};