Qt Creator 3.1.2+Qt 5.3.1+OpenCV 3.0 开发环境下，找不到头文件的错误解决办法

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　　当在Qt Creator 中编辑完.pro文件后，构建项目出现错误，但我确定配置文件中没有写错，查了许多资料，

错误信息如下：

　　F:\OpenCV_Qt\main.cpp:1: error: C1083: 无法打开包括文件: “opencv2/opencv.hpp”: No such file or directory

查找过的资料链接：

　　　http://www.librehat.com/qt-5-2-vs2012-opencv-2-4-7-dev-environment-setup-tutorial/

解决方法：

　　在配置完.pro文件后，最好先点击：构建|执行qmake 命令来使对.pro的更改生效。之后再生成项目。

解决过程：

新建Qt控制台应用程序，用下面的代码替换Qt Creator自动生成的代码，其中的读取图片的路径因人而异：

#include <opencv2/opencv.hpp>using namespace cv;int main(){    Mat img = imread("F:\\OpenCV3.0\\OpenCV3.0\\9.jpg");    if (img.empty())    {        fprintf(stderr, "Error: load image failed.");        return -1;    }    namedWindow("image", WINDOW_AUTOSIZE);    imshow("image", img);    waitKey();    return 0;}

在Qt工程的.pro文件中设置了如下内容，其中的OpenCV的头文件目录和库目录都是我的机器上的安装目录，读者适当更改为自己的。

#-------------------------------------------------## Project created by QtCreator 2014-09-16T17:41:45##-------------------------------------------------QT       += coreQT       -= guiTARGET = OpenCV_QtCONFIG   += consoleCONFIG   -= app_bundleTEMPLATE = appSOURCES += main.cppINCLUDEPATH += F:\OpenCV-bin-packages\includewin32:CONFIG(debug, debug|release): {LIBS += -LF:\OpenCV-bin-packages\x86\vc12\lib \-lopencv_calib3d300d    \-lopencv_core300d       \-lopencv_features2d300d \-lopencv_flann300d      \-lopencv_highgui300d    \-lopencv_imgcodecs300d  \-lopencv_imgproc300d    \-lopencv_ml300d         \-lopencv_objdetect300d  \-lopencv_photo300d      \-lopencv_shape300d      \-lopencv_stitching300d  \-lopencv_superres300d   \-lopencv_ts300d         \-lopencv_video300d      \-lopencv_videoio300d    \-lopencv_videostab300d  \-lopencv_viz300d} else:win32:CONFIG(release, debug|release): {LIBS += -LF:\OpenCV-bin-packages\x86\vc12\lib \-lopencv_calib3d300    \-lopencv_core300       \-lopencv_features2d300 \-lopencv_flann300      \-lopencv_highgui300    \-lopencv_imgcodecs300  \-lopencv_imgproc300    \-lopencv_ml300         \-lopencv_objdetect300  \-lopencv_photo300      \-lopencv_shape300      \-lopencv_stitching300  \-lopencv_superres300   \-lopencv_ts300         \-lopencv_video300      \-lopencv_videoio300    \-lopencv_videostab300  \-lopencv_viz300}

执行程序构建时出现如下错误：

执行一次构建|执行qmake 并再次构建程序，就没有错误了：

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