Qt 创建器错误:找不到 -lopencv_imgcodecs

Majid Alaeinia，从您发布的CMakeLists.txt文件中，没有指定CMAKE应该如何找到从您的项目请求的库。也没有声明target_link_libraries，所以CMAKE不知道在哪里链接它们。希望以下小示例模板对您的项目有所帮助：

cmake_minimum_required (VERSION 3.1)
project(yourProject)
find_package( OpenCV REQUIRED )
find_package( Qt5 REQUIRED COMPONENTS Sql )
### this is for c++11
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(CMAKE_INCLUDE_CURRENT_DIR ON)
### QT stuff if you want a GUI
set(CMAKE_AUTOMOC ON)  # autogenerate qt gui features
set(CMAKE_AUTORCC ON)  # used for QT resource Files (if you need)
## Additional operation...
# From here you are specifically linking all OpenCV libraries and executables
### Add executables
add_executable(yourExecutable main/main.cpp ui/res/res.qrc ${SRCS} ${UI_HDRS} ${UI_SRCS})
target_link_libraries (yourProject example Qt5::Widgets ${OpenCV_LIBS}  Qt5::Sql)
### Add Library
add_library(yourProject_lib SHARED ${SRCS} ${UI_HDRS})
target_link_libraries (yourProject_lib example Qt5::Widgets ${OpenCV_LIBS})

@ Majid Alaeinia，我上传了存储库并浏览了代码。 如果您进入 demo 文件夹并使用我在下面提供的文件更改当前CMakeLists.txt文件，它应该编译(它确实通过提供的更改在我的编译(：

project(demo)
cmake_minimum_required(VERSION 2.6)
find_package(Qt5 REQUIRED COMPONENTS Widgets Core)
FIND_PACKAGE( OpenCV REQUIRED )
include_directories(${QT_INCLUDES} ${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_SOURCE_DIR}/lib ${CMAKE_CURRENT_SOURCE_DIR})
set(demo_SRCS main.cpp projfile.cpp deformwin.cpp myimage.cpp singlephotoview.cpp pointspaint.cpp)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(CMAKE_INCLUDE_CURRENT_DIR ON)
#qt5_automoc(${demo_SRCS})
QT5_WRAP_CPP(QOBJ_CPP ${demo_SRCS})
qt5_wrap_ui(helloworld_FORMS_HEADERS deformwin.ui)
add_executable(demo ${demo_SRCS} ${helloworld_FORMS_HEADERS})
target_link_libraries(demo ${QT_QTCORE_LIBRARY} ${QT_QTGUI_LIBRARY} imgwarp-lib opencv_core opencv_imgproc opencv_imgcodecs)

存储库中的代码是旧代码，仍然将Qt4作为主包装器。我想您可能已经在计算机上安装了Qt5，实际上我提供的代码适用于Qt5。将其用作文件夹中存在的其他CMakeLists.txt文件的指南src并相应地进行更改。

CMake将编译，但由于它是Qt4使用的，因此您需要找出要添加的最重要的模块，例如，包含QtGui/QApplication的新标准通常由QtWidgets/QApplication

我还想留下我之前的答案，以防您需要起点或初始模板。我希望这能澄清更多，并可以让您继续推进您的项目。