c++ - 体系结构 x86_64 的 undefined symbol :cv::CascadeClassifier::CascadeClassifier()

Question

我在 OSX 上的 Qt 5.2 中使用 openCV 2.4.6.1。一切都很好，但是当我尝试使用 cv::CascadeClassifier 时，出现链接错误，显示此符号未针对体系结构 x86_64 定义。有解决这个问题的想法吗？谢谢。

TEMPLATE = app
TARGET = camera

QT += multimedia multimediawidgets

INCLUDEPATH += /usr/local/Cellar/opencv/2.4.6.1/include \

LIBS += -L/usr/local/Cellar/opencv/2.4.6.1/lib \
     -lopencv_core \
     -lopencv_imgproc \
     -lopencv_features2d \
     -lopencv_highgui

HEADERS = \
    camera.h \
    imagesettings.h \
    videosettings.h \


SOURCES = \
    main.cpp \
    camera.cpp \
    imagesettings.cpp \
    videosettings.cpp \

FORMS += \
    camera.ui \
    videosettings.ui \
    imagesettings.ui

target.path = $$[QT_INSTALL_EXAMPLES]/multimediawidgets/camera
INSTALLS += target

QT+=widgets

Answer 1

您需要在项目文件中扩展 LIBS 变量，因为 cv:CascadeClassifier 可以在该库中找到:

LIBS += -L/usr/local/Cellar/opencv/2.4.6.1/lib \
    -lopencv_core \
    -lopencv_imgproc \
    -lopencv_features2d \
    -lopencv_highgui \
    -lopencv_objdetect # This is the addition