（这是mainwindow.h里的内容，中间四个include包含的文件总是找不到）
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

//#include
#include

#include
#include
#include
#include

//#include "cv.h"
//#include "cxcore.h"
//#include "highgui.h"
#include
#include
#include
using namespace std;
using namespace cv;
class MainWindow : public QMainWindow
{
……（后面不打了）

（这是pro文件里opencv的配置，我的opencv文件是放在c:\opencv文件夹里的，系统的环境变量自己也配了）
INCLUDEPATH+=c:\opencv\opencv\build\include\opencv\

c:\opencv\opencv\build\include\opencv2\

   c:\opencv\opencv\build\include\

LIBS+=c:\opencv\opencv\MinGW\lib\libopencv_calib3d249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_contrib249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_core249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_features2d249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_flann249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_gpu249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_highgui249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_imgproc249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_legacy249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_ml249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_objdetect249.dll.a\

c:\opencv\opencv\MinGW\lib\libopencv_video249.dll.a