c++ - Qt Creator 错误 : cannot find -lopencv_imgcodecs

Question

我已经通过 VMware on windows 在 ubuntu 15.10 上安装了 opencv、qt、qt creator、cmake。

opencv在这个目录中安装:/home/majidalaeinia/opencv/

project repository被克隆到这个目录中:/home/majidalaeinia/Desktop/imgwarp-opencv/

我要运行 the project通过其 CMakeLists.txt在 qt creator 中，当我在 qt creator 上按 Build now 时，出现以下错误:

error: cannot find -lopencv_imgcodecs
error: collect2: error: ld returned 1 exit status

问题出在哪里，如何解决？

Answer 1

@ Majid Alaeinia，在您发布的 CMakeLists.txt 文件中，未指定 CMAKE 应如何找到您的项目请求的库。也没有 target_link_libraries 声明，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})