Qt Creator 中未定义的引用错误 |打开简历

Question

我在 this 指南的帮助下将 OpenCV 链接到 Qt Creator。然而，在编译一个简单的代码来读取和显示图像时，我遇到了未定义的引用错误。

test.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

TARGET = opencvtest
TEMPLATE = app
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

INCLUDEPATH += D:\opencv\build\include

LIBS += D:\opencv-build\bin\libopencv_core320.dll
LIBS += D:\opencv-build\bin\libopencv_highgui320.dll
LIBS += D:\opencv-build\bin\libopencv_imgcodecs320.dll
LIBS += D:\opencv-build\bin\libopencv_imgproc320.dll
LIBS += D:\opencv-build\bin\libopencv_features2d320.dll
LIBS += D:\opencv-build\bin\libopencv_calib3d320.dll


# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    cv::Mat image = cv::imread("img101.jpg", 1);
       cv::namedWindow("My Image");
       cv::imshow("My Image", image);
}

MainWindow::~MainWindow()
{
    delete ui;
}

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

These are the errors 我正在构建文件。使用 Windows 10，MinGW 7.3.0 32 位 C 和 C++ 编译器。

Answer 1

现在一切正常。显然我必须通过 right-clicking 在 left-sidebar 上的项目文件夹中 link 库，选择添加库并选择外部库选项（一个一个地添加).

win32: LIBS += -LD:/opencv-build/install/x86/mingw/lib/ -llibopencv_core320.dll
win32: LIBS += -LD:/opencv-build/install/x86/mingw/lib/ -llibopencv_highgui320.dll
win32: LIBS += -LD:/opencv-build/install/x86/mingw/lib/ -llibopencv_imgcodecs320.dll 
INCLUDEPATH += D:/opencv-build/install/include
DEPENDPATH += D:/opencv-build/install/include

////NOTE: imgcodecs library is required for imread to work//////

参考文献：

imread OpenCV 文档

imgcodecs and imread post

Qt Creator 中未定义的引用错误 |打开简历

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