2、 qt平台opencv引入，和工程搭建

时间:2025/8/13 15:42:30来源：https://blog.csdn.net/qq_51355375/article/details/140880557 浏览次数:0次

1. 准备工作

opencv 编译，参考： https://blog.csdn.net/qq_51355375/article/details/140857966
vscode qt cmake工程创建及环境搭建： https://blog.csdn.net/qq_51355375/article/details/140752130

2. 引入opencv 头文件和链接库

2.1 配置环境变量

将目录 opecv 安装目录\install\x64\mingw\bin 配置到环境变量，不然代码运行时会找不到动态库。
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2.2 cmake 配置，添加opencv 头文件，依赖

# 查找库和头文件路径， opencv 安装 install目录
list(APPEND CMAKE_PREFIX_PATH "D:/workspace-opencv/opencv-4.10.0/build_qt_mingw/install")  
# 查找OpenCV 
find_package(OpenCV REQUIRED)# 链接OpenCV库
target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})# 包含OpenCV的头文件目录
target_include_directories(${PROJECT_NAME} PRIVATE ${OpenCV_INCLUDE_DIRS})

CmakeLists.txt

cmake_minimum_required(VERSION 3.5)project(app VERSION 0.1 LANGUAGES CXX)set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)# 查找库和头文件路径， opencv 安装 install目录
list(APPEND CMAKE_PREFIX_PATH "D:/workspace-opencv/opencv-4.10.0/build_qt_mingw/install")  
# 查找OpenCV 
find_package(OpenCV REQUIRED)message(STATUS "OpenCV : ${OpenCV}") 
message(STATUS "OpenCV found: ${OpenCV_FOUND}")  
message(STATUS "OpenCV include dirs: ${OpenCV_INCLUDE_DIRS}")  
message(STATUS "OpenCV libraries: ${OpenCV_LIBS}")find_package(QT NAMES QT6 QT5 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets) include_directories(${PROJECT_SOURCE_DIR}/include)file(GLOB_RECURSE SRC_CPP_FILES src/*.cpp)  
file(GLOB_RECURSE SRC_HEADER_FILES include/*.h) 
set(PROJECT_SOURCES ${SRC_CPP_FILES} ${SRC_HEADER_FILES}) 
message(STATUS "src:${PROJECT_SOURCES}")if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)qt_add_executable(appMANUAL_FINALIZATION${PROJECT_SOURCES})
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET qt_cmake_template APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()if(ANDROID)add_library(${PROJECT_NAME} SHARED${PROJECT_SOURCES})
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")else()add_executable(${PROJECT_NAME}${PROJECT_SOURCES})endif()
endif()# 链接OpenCV库
target_link_libraries(${PROJECT_NAME} PRIVATE Qt${QT_VERSION_MAJOR}::Widgets ${OpenCV_LIBS})# 包含OpenCV的头文件目录
target_include_directories(${PROJECT_NAME} PRIVATE ${OpenCV_INCLUDE_DIRS})set_target_properties(${PROJECT_NAME} PROPERTIESMACOSX_BUNDLE_GUI_IDENTIFIER my.example.comMACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}MACOSX_BUNDLE OFFWIN32_EXECUTABLE OFF
)install(TARGETS ${PROJECT_NAME}BUNDLE DESTINATION .LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})if(QT_VERSION_MAJOR EQUAL 6)qt_finalize_executable(${PROJECT_NAME})
endif()

2.3 qDebug cout printf 等输出控制台没反应

修改cmake配置，为OFF

 MACOSX_BUNDLE OFFWIN32_EXECUTABLE OFF

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3. 测试

#include "widget.h"
#include <QLabel>
#include <QVBoxLayout>
#include <qglobal.h>
#include <qimage.h>
#include <qpixmap.h>
#include <QDebug>
QImage Widget::Mat2QImage(cv::Mat mat)  
{  switch (mat.type()) {  // 8-bit, 4-channel  case CV_8UC4:  {  QImage image(mat.data, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);  return image.copy();  }  // 8-bit, 3-channel  case CV_8UC3:  {  QImage image(mat.data, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);  image = image.rgbSwapped(); // OpenCV reads images in BGR, Qt uses RGB  return image.copy();  }  // 8-bit, 1-channel  case CV_8UC1:  {  QImage image(mat.cols, mat.rows, QImage::Format_Grayscale8);  uchar *pSrc = mat.data;  for(int y = 0; y < mat.rows; ++y)  {  memcpy(image.scanLine(y), pSrc, mat.cols);  pSrc += mat.step;  }  return image;  }  default:  return QImage();  }  
}Widget::Widget(QWidget *parent) : QWidget(parent) {this->setWindowTitle("vscode");this->resize(500, 400);QLabel *label = new QLabel(this);QVBoxLayout *vbox = new QVBoxLayout(this);vbox->addWidget(label);qDebug() << "Image load before ========= " ;// 加载图像cv::Mat image = cv::imread("C:/Users/ylp/Pictures/壁纸/22.jpeg");qDebug() << "Image。empty: " << image.empty();if (!image.empty()) {QImage qimage = Mat2QImage(image);label->setPixmap(QPixmap::fromImage(qimage));}}Widget::~Widget() {}

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <qimage.h>
#include <opencv2/opencv.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>class Widget : public QWidget 
{Q_OBJECTpublic: Widget(QWidget *parent = nullptr);~Widget();private:QImage *image;QImage Mat2QImage(cv::Mat src);
};#endif

#include "widget.h"#include <QApplication>
#include <QDebug>int main(int argc, char* argv[]) {QApplication app(argc, argv);Widget w;w.show();return app.exec();
}