如何修复'undefined reference'错误opencv和g ++

Question

[我正在尝试在使用OpenCV的VSCode中构建简单的程序，已经在堆栈上阅读了数千篇文章，它们都是在linux上编写的（并且我尝试在Windows上完成，这是我的代码]

这是我尝试使用的：

"args": [
                "-g",
                "-I",
                "C:\\OpenCV\\opencv\\build\\include",
                "${file}",
                "-L",
                "C:\\OpenCV\\opencv\\build\\x64\\vc15\\lib",
                "-l",
                "opencv_world345",
                "-o",
                "${fileDirname}\\${fileBasenameNoExtension}.exe"
            ],

我几次检查路径

#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
    Mat image;
    image = imread( argv[1], 1 );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

这是我得到的结果

执行任务：C：\ MinGW \ bin \ g ++。exe -IC：\ OpenCV \ opencv \ build \ include> d：\ programowanie \ Projekt \ Project \ main.cpp -L> C：\ OpenCV \ opencv \ build \ x64 \ vc15 \ lib -l opencv_world345 -o> d：\ programowanie \ Projekt \ Project \ main.exe <

c：/ mingw / bin /../ lib / gcc / mingw32 / 8.2.0 /../../../../ mingw32 / bin / ld.exe：> C：\ Users \ xxx \ AppData \ Local \ Temp \ ccXtHNOY.o：main.cpp :(。text + 0x72）：对

cv::imread(cv::String const&, int)'
  c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: >C:\Users\xxx\AppData\Local\Temp\ccXtHNOY.o:main.cpp:(.text+0xe3): undefined reference to

cv :: namedWindow（cv :: String const＆，int）的未定义引用”c：/ mingw / bin /../ lib / gcc / mingw32 / 8.2.0 /../../../../ mingw32 / bin / ld.exe：> C：\ Users \ xxx \ AppData \ Local \ Temp \ ccXtHNOY.o：main.cpp :(。text + 0x129）：>对

cv::imshow(cv::String const&, cv::_InputArray const&)'
  c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: >C:\Users\xxx\AppData\Local\Temp\ccXtHNOY.o:main.cpp:(.text+0x149): >undefined reference to

cv :: waitKey（int）的未定义引用c：/ mingw / bin /../ lib / gcc / mingw32 / 8.2.0 /../../../../ mingw32 / bin / ld.exe：> C：\ Users \ xxx \ AppData \ Local \ Temp \ ccXtHNOY.o：main.cpp :(。text $ _ZN2cv6StringC1EPKc [__ ZN2cv6StringC1EPKc] + 0x42）：未定义对

cv::String::allocate(unsigned int)'
  c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: >C:\Users\xxx\AppData\Local\Temp\ccXtHNOY.o:main.cpp:(.text$_ZN2cv6StringD1Ev[__ZN2cv6StringD1Ev]+0xf): undefined reference to

cv :: String :: deallocate（）'的引用c：/ mingw / bin /../ lib / gcc / mingw32 / 8.2.0 /../../../../ mingw32 / bin / ld.exe：> C：\ Users \ xxx \ AppData \ Local \ Temp \ ccXtHNOY.o：main.cpp :(。text $ ZN2cv6StringaSERKS0 [__ ZN2cv6StringaSERKS0 _] + 0x1c）：未定义对

cv::String::deallocate()'
  c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: >C:\Users\xxx\AppData\Local\Temp\ccXtHNOY.o:main.cpp:(.text$_ZN2cv3MatD1Ev[__ZN2cv3MatD1Ev]+0x2d): undefined reference to

cv :: fastFree（void *）的引用c：/ mingw / bin /../ lib / gcc / mingw32 / 8.2.0 /../../../../ mingw32 / bin / ld.exe：> C：\ Users \ xxx \ AppData \ Local \ Temp \ ccXtHNOY.o：main.cpp :(。text $ _ZN2cv3Mat7releaseEv [__ ZN2cv3Mat7releaseEv] + 0x40）：未定义对

cv::Mat::deallocate()'
  c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: >C:\Users\xxx\AppData\Local\Temp\ccXtHNOY.o:main.cpp:(.text$_ZN2cv3MataSEOS0_[__ZN2cv3MataSEOS0_]+0xb4): undefined reference to

cv :: fastFree（void *）的引用collect2.exe：错误：ld返回1退出状态

我不知所措，希望任何人都知道发生了什么事

Answer 1

问题是您正在使用Visual Studio二进制文件进行mingw。如果该库是c库，则可能会起作用，但对于opencv将不起作用。以下站点具有用于mingw的非官方opencv二进制文件：https://github.com/huihut/OpenCV-MinGW-Build