#-------------------------------------------------## Project created by QtCreator 2014-12-29T16:10:53##-------------------------------------------------QT       -= core guiTARGET = dlldemoTEMPLATE = libCONFIG += staticlibSOURCES += dlldemo.cppHEADERS += dlldemo.hINCLUDEPATH += D:/sdk/opencv/build/includeLIBS += -LD:/sdk/opencv/build/x86/vc12/lib     -lopencv_calib3d249d     -lopencv_contrib249d     -lopencv_core249d     -lopencv_features2d249d     -lopencv_flann249d     -lopencv_gpu249d     -lopencv_highgui249d     -lopencv_imgproc249d     -lopencv_legacy249d     -lopencv_ml249d     -lopencv_nonfree249d     -lopencv_objdetect249d     -lopencv_ocl249d     -lopencv_photo249d     -lopencv_stitching249d     -lopencv_superres249d     -lopencv_ts249d     -lopencv_video249d     -lopencv_videostab249dunix {    target.path = /usr/lib    INSTALLS += target}

#ifndef DLLDEMO_H#define DLLDEMO_H#include <iostream>#include <fstream>#include <sstream>#include <string>#include <vector>#include <opencv2/objdetect/objdetect.hpp>#include <opencv2/highgui/highgui.hpp>#include <opencv2/imgproc/imgproc.hpp>#include <opencv2/core/core.hpp>using namespace std;using namespace cv;class Dlldemo{public:    Dlldemo();    int addtwo(int a,int b);    Mat togray(Mat img);    void draw_text(cv::Mat &canvas, const char *str, int x, int y, float scale = 1.0);};#endif // DLLDEMO_H

#include "dlldemo.h"Dlldemo::Dlldemo(){}int Dlldemo::addtwo(int a, int b){    return a+b;}Mat Dlldemo::togray(Mat img){    cv::Mat greyMat;    cv::cvtColor(img, greyMat, CV_BGR2GRAY);    draw_text (greyMat,"#by dll function", 5, 30,0.8);    return greyMat;}void Dlldemo::draw_text(Mat &canvas, const char *str, int x, int y, float scale){    int w = 2;    for(int dy = -w; dy <= w; ++dy) {        for (int dx = -w; dx <= w; ++dx) {            cv::putText(canvas, str, cv::Point(x+dx,y+dy), cv::FONT_HERSHEY_SIMPLEX, scale, cv::Scalar(0,0,0), 2, CV_AA);        }    }    cv::putText(canvas, str, cv::Point(x,y), cv::FONT_HERSHEY_SIMPLEX, scale, cv::Scalar(255,255,255), 2, CV_AA);}

LIBS += -LD:/project/testdlldemo     -ldlldemoINCLUDEPATH += D:/sdk/opencv/build/includeLIBS += -LD:/sdk/opencv/build/x86/vc12/lib     -lopencv_calib3d249d     -lopencv_contrib249d     -lopencv_core249d     -lopencv_features2d249d     -lopencv_flann249d     -lopencv_gpu249d     -lopencv_highgui249d     -lopencv_imgproc249d     -lopencv_legacy249d     -lopencv_ml249d     -lopencv_nonfree249d     -lopencv_objdetect249d     -lopencv_ocl249d     -lopencv_photo249d     -lopencv_stitching249d     -lopencv_superres249d     -lopencv_ts249d     -lopencv_video249d     -lopencv_videostab249d

#include <iostream>#include "dlldemo.h"using namespace std;int main(){    cout << "Hello World!" << endl;    int a=10;    int b=20;    Dlldemo dll;    printf("sum of a,b is :%d",dll.addtwo (a,b));    cv::Mat canvas;    canvas = cv::imread("d://nike.jpg", -1);    Mat result= dll.togray (canvas);    imshow ("dll result",result);    waitKey ();    return 0;}