c++ - visual - errore LNK2019: simbolo esterno non risolto opencv




lnk2019 visual studio 2017 (2)

Ho scritto questo semplice programma che carica le matrici dai file txt e calcola le distanze. Quando compilo il programma in Visual Studio su Windows ottengo i seguenti errori:

1>main.obj : error LNK2019: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?[email protected]@@[email protected]) referenced in function "public: __thiscall     cv::Mat::~Mat(void)" (??[email protected]@@[email protected])
1>system.obj : error LNK2001: unresolved external symbol "void __cdecl cv::fastFree(void *)" (?[email protected]@@[email protected])
1>main.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?[email protected]@[email protected]@QAEXXZ) referenced in function "public: void __thiscall cv::Mat::release(void)" (?[email protected]@[email protected]@QAEXXZ)
1>system.obj : error LNK2001: unresolved external symbol "public: void __thiscall cv::Mat::deallocate(void)" (?[email protected]@[email protected]@QAEXXZ)
1>main.obj : error LNK2019: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?[email protected]@@[email protected]) referenced in function "public: void __thiscall cv::Mat::release(void)" (?[email protected]@[email protected]@QAEXXZ)
1>system.obj : error LNK2001: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?[email protected]@@[email protected])
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)" (??[email protected]@@[email protected]?[email protected]?[email protected]@[email protected]@V?[email protected]@[email protected]@[email protected]@[email protected]) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??[email protected]@[email protected]@@[email protected])
1>system.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall cv::Exception::~Exception(void)" (??[email protected]@@[email protected]) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??[email protected]@[email protected]@@[email protected])
1>system.obj : error LNK2019: unresolved external symbol "void __cdecl cv::error(class cv::Exception const &)" (?[email protected]@@[email protected]@@Z) referenced in function "public: int & __thiscall cv::Mat::at<int>(int,int)" (??[email protected]@[email protected]@@[email protected])
1>system.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::create(int,int const *,int)" (?[email protected]@[email protected]@[email protected]) referenced in function "public: void __thiscall cv::Mat::create(int,int,int)" (?[email protected]@[email protected]@[email protected])
1>C:\Users\Ram\documents\visual studio 2012\Projects\descrip\Debug\descrip.exe : fatal error LNK1120: 7 unresolved externals

Ho inserito Opencv 2.4.6 sul mio computer e l'ho collegato correttamente allo studio visivo.

main.cpp

#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;
} 

system.h

#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;
};

system.cpp

#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();
};

Che cosa sto facendo di sbagliato????


Probabilmente hai incluso i file di intestazione giusti, ma hai dimenticato di aggiungere la libreria. È necessario aggiungere il corrispondente file * .lib nelle impostazioni del progetto.


Come altri già menzionati, è necessario assicurarsi di collegare correttamente le librerie OpenCV.

Verifica che il tuo Progetto -> Proprietà -> Directory VC ++ -> Directory di libreria , includa il percorso in cui si trovano le librerie di OpenCV, l'impostazione predefinita sarebbe 'C: \ opencv \ build \ x86 \ vc11 \ lib' (su una macchina a 32 bit eseguendo VS2012, varierà su altre configurazioni).

Successivamente, controlla che le seguenti librerie siano incluse nel progetto -> Proprietà -> Linker -> Input -> Dipendenze aggiuntive :

opencv_core246d.lib
opencv_imgproc246d.lib
opencv_highgui246d.lib
opencv_ml246d.lib
opencv_video246d.lib
opencv_features2d246d.lib
opencv_calib3d246d.lib
opencv_objdetect246d.lib
opencv_contrib246d.lib
opencv_legacy246d.lib
opencv_flann246d.lib

Se quanto sopra è corretto, non dovresti ottenere più errori di collegamento OpenCV.







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