qt - OpenCV2.3和QT编译问题

Question

引用了下面的问题，轻而易举的设置了QT4.7.0，QtCreator 2.0.0 for openCV2.3

OpenCV2.3 and QTCreator现在，对于我尝试使用的所有 OpenCV 函数，我不断收到以下错误以及更多错误，尽管 Qt 自己的智能感知会在我键入时向我显示函数。

对 cv::imread("img.jpg") 的 undefined reference 对 cv::namedWindow("window") 的 undefined reference

我在这里做错了什么？

在 intel core 2 Duo 机器上使用 Win7 X86。

.Pro文件包含以下内容

#-------------------------------------------------
#
# Project created by QtCreator 2011-08-28T00:44:27
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = myQtConsoleProject
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += main.cpp


INCLUDEPATH += H:/OpenCV2.3/build/include
INCLUDEPATH += H:/OpenCV2.3/build/include/opencv


LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_calib3d230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_contrib230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_core230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_features2d230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_flann230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_highgui230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_imgproc230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_objdetect230.lib
LIBS += H:/OpenCV2.3/build/x86/vc9/lib/opencv_video230.lib

我得到的错误如下

debug/main.o: In function `main': 
G:\QT Projects\myQtConsoleProject-build-desktop/../myQtConsoleProject/main.cpp:6: undefined reference to `cv::imread(std::string const&, int)' 
G:\QT Projects\myQtConsoleProject-build-desktop/../myQtConsoleProject/main.cpp:7: undefined reference to `cv::namedWindow(std::string const&, int)' 
G:\QT Projects\myQtConsoleProject-build-desktop/../myQtConsoleProject/main.cpp:8: undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)' 
G:\QT Projects\myQtConsoleProject-build-desktop/../myQtConsoleProject/main.cpp:8: undefined reference to `cv::imshow(std::string const&, cv::_InputArray const&)' 
G:\QT Projects\myQtConsoleProject-build-desktop/../myQtConsoleProject/main.cpp:9: undefined reference to `cv::waitKey(int)' 
debug/main.o: In function `~Mat': 
h:/OpenCV2.3/build/include/opencv2/core/mat.hpp:297: undefined reference to `cv::fastFree(void*)' 
debug/main.o:h:/OpenCV2.3/build/include/opencv2/core/mat.hpp:381: undefined reference to `cv::Mat::deallocate()' 
collect2: ld returned 1 exit status 
mingw32-make[1]: *** [debug\myQtConsoleProject.exe] Error 1 
mingw32-make: *** [debug] Error 2 
The process "E:/Qt/2010.04/mingw/bin/mingw32-make.exe" exited with code %2.
Error while building project myQtConsoleProject (target: Desktop)
When executing build step 'Make'

更新:作为Alexdim曾指出如果 Qt 仍然无法识别函数，我将需要重建 OpenCV，事实证明这是真的。作为这个问题的答案。在 WIN7 x86 下重建 OpenCV。我使用 minGW 来更正问题。可能这也需要为 VC++ 完成。无论如何......幸运的是现在能够使用 OpenCV 和 Qt!

Answer 1

.lib 用于 Visual C++。它们可以与 MinGW 工具链无误地链接，但只能访问 OpenCV C API，新的 C++ API(“cv”命名空间、类...)将无法访问。

由于您的 Qt 构建是使用 MinGW 编译的，因此您应该在 build/x86/mingw 目录中包含 .a 文件，而不是 .lib 文件。
如果它仍然不起作用，您可能必须使用 QtSDK 中包含的编译器完全重建 OpenCV。