网上的教程说的都是mingw编辑器的qt版本，所以需要重新编译opencv
其实使用MSVC编辑器的话，可以直接调用。
只需要在pro文件里进行配置即可：
在pro写上：
#-------------------------------------------------#
# Project created by QtCreator 2015-06-02T18:30:52
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = charLoc
TEMPLATE = app
SOURCES += main.cpp\
widget.cpp
HEADERS += widget.h
FORMS += widget.ui
INCLUDEPATH +=C:\opencv\build\include
INCLUDEPATH +=C:\opencv\build\include\opencv
INCLUDEPATH +=C:\opencv\build\include\opencv2
CONFIG +=qt warn_on release
CONFIG(release,debug|release)
{
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_videostab2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_video2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ts2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_superres2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_stitching2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_photo2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ocl2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_objdetect2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_nonfree2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ml2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_legacy2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_imgproc2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_highgui2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_gpu2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_flann2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_calib3d2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_features2d2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_core2410.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_contrib2410.lib
}
CONFIG(debug,debug|release){
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_videostab2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_video2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ts2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_superres2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_stitching2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_photo2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ocl2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_objdetect2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_nonfree2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_ml2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_legacy2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_imgproc2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_highgui2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_gpu2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_flann2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_calib3d2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_features2d2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_core2410d.lib
LIBS+=C:\opencv\build\x86\vc12\lib\opencv_contrib2410d.lib
}
在mian函数里面：
#include "widget.h"#include <QApplication>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <QDebug>
using namespace cv;
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
Mat p_w_picpath= imread("D:/1.bmp",0);
if(!p_w_picpath.empty())
{
qDebug()<<"iscc";
imwrite("D:/1_2.bmp",p_w_picpath);
}
else
{
qDebug()<<"is error";
}
return a.exec();
}在使用过程中，有时候配置都正确，但是就是编译不通过，
其实只需要把debug和release编译的临时文件全部删除，重新编译即可
下面直接把整个工程放出来
