OpenCV2.3 and QT compile problem

After referring to the following question, it was a flick to setup QT4.7.0, QtCreator 2.0.0 for openCV2.3

OpenCV2.3 and QTCreator Now, I keep getting the following error and more for all the OpenCV functions that I try to use, despite, Qt's own intellisense showing me the functions as I type.

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

What am I doing wrong here?

Using Win7 X86 on a intel core 2 Duo machine.

.Pro file contains the following

#-------------------------------------------------
#
# 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

And the errors I get are as follows

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'

UPDATE: As Alexdim 开发者_如何学运维had pointed out that I would require to rebuild OpenCV if Qt was still unable to recognize the functions, it turned out to be true. As an answer to this question. Rebuild OpenCV under WIN7 x86. I used minGW for my correction of the problem. May be this needs to be done for VC++ as well. Anyway... lucky to be able to use OpenCV and Qt now!

The .lib are for Visual C++. They can be linked without error with a MinGW toolchain, but only the OpenCV C API will be accessible, the new C++ API ("cv" namespace, classes...) won't be.

Since your Qt build is compiled with and for MinGW, you should include the .a files in the build/x86/mingw directory not the .lib files.
You might have to rebuild OpenCV completely with the compiler included with the QtSDK, if it still doesn't work.