项目场景：

Win10下 QT Creator配置opencv库文件：

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环境描述：

QT Creator版本：4.11.1
opencv库文件：4.1.0

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原因分析：

由于opencv的库文件一般是dll动态链接库文件，可以被MSVC（Visual studio编译器所编译引用），但QT一般采用的是MinGw编译器，所以要引用opencv的动态链接库需要通过Cmake编译器转换一下。下列步骤可以成功在QT creator中配置opencv库文件

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解决方案：

默认已在win10中下载好QT，并安装相应的MinGw32和64编译器，并添加了相应MInGW的系统变量，根据自己QT中的MinGW路径自行添加，主要添加后两个。

正常情况下是需要下载cmake对opencv文件进行编译转换，但下面网站中已经有各个版本的opencv的MinGw的编译文件，省去自己下载cmake将opencv文件编译转换了。

链接: https://codechina.csdn.net/mirrors/huihut/opencv-mingw-build?utm_source=csdn_github_accelerator.

点击configuration查看编译环境，下载相应版本的.zip即可

我下的是OpenCV-MinGW-Build-OpenCV-4.1.0，放在D:\中

将D:\OpenCV-MinGW-Build-OpenCV-4.1.0\x86\mingw\bin添加进系统变量Path中

新建QT widget项目，一路默认，在QT项目栏的配置文件.pro中添加，如下：

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#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

TRANSLATIONS += \
    QT_MultipleVision_zh_CN.ts

INCLUDEPATH += D:\OpenCV-MinGW-Build-OpenCV-4.1.0\include\
               D:\OpenCV-MinGW-Build-OpenCV-4.1.0\include\opencv2\
               D:\OpenCV-MinGW-Build-OpenCV-4.1.0\include\opencv

LIBS += D:\OpenCV-MinGW-Build-OpenCV-4.1.0\x86\mingw\lib\libopencv_*.a

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

在main.cpp源文件中添加 #include "opencv2/opencv.hpp"以及下述代码进行OpenCV成功配置的验证

cv::Mat image = imread("C:\\Users\\admin\\Desktop\\J30J.jpg");
        namedWindow("Display window",WINDOW_AUTOSIZE);
        imshow("Display window",image);
        waitKey();

// main.cpp
#include "mainwindow.h"

#include <QApplication>

#include "opencv2/opencv.hpp"

using namespace cv;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    cv::Mat image = imread("C:\\Users\\admin\\Desktop\\J30J.jpg");
        namedWindow("Display window",WINDOW_AUTOSIZE);
        imshow("Display window",image);
        waitKey();

    MainWindow w;
    w.show();
    return a.exec();
}

代码中图片路径根据自己实际情况进行编写，然后点击小锤子进行编译，然后运行。

结果会弹出你所设置路径下的图片，至此QT Creator的OpenCV库文件配置完成

如出现error: undefined reference to之类的错误，可以尝试将QT项目文件夹下的Debug文件夹、Release文件夹删除，然后进行重新编译，QT的debug构建Kit选择MinGw32 bit