Making a dynamic link library for use with OPENCV programs (using Qtcreator)

Create a new C + + library project

Pro File

#-------------------------------------------------# # Project created by Qtcreator the- A-29t16:Ten: -##-------------------------------------------------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}

Dlldemo.h

#ifndef Dlldemo_h#defineDlldemo_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 namespacestd;using namespaceCV;classdlldemo{ Public: Dlldemo (); intAddtwointAintb);    Mat Togray (Mat img); voidDraw_text (Cv::mat &canvas,Const Char*STR,intXintYfloatScale =1.0);};#endif //Dlldemo_h

Dlldemo.cpp

#include"dlldemo.h"Dlldemo::D Lldemo () {}intDlldemo::addtwo (intAintb) { returnA +b;}    Mat Dlldemo::togray (Mat img) {Cv::mat greymat;    Cv::cvtcolor (IMG, Greymat, Cv_bgr2gray); Draw_text (Greymat,"#by DLL Function",5, -,0.8); returnGreymat;}voidDlldemo::d raw_text (Mat &canvas,Const Char*STR,intXintYfloatScale ) { intW =2;  for(intDY =-W; Dy <= W; ++dy) {  for(intDX =-W; DX <= W; ++dx) {CV::p uttext (canvas, str, CV::P oint (x+dx,y+dy), Cv::font_hershey_simplex, scale, cv::scalar (0,0,0),2, CV_AA); }} CV::p uttext (canvas, str, CV::P oint (x, y), Cv::font_hershey_simplex, scale, cv::scalar (255,255,255),2, CV_AA);}

Build---> Build

Test

Create a new C + + project

Copy dlldemo.h and Dlldemo.lib

Modify the Pro file

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

Test Code Main.cpp

#include <iostream>#include"dlldemo.h"using namespacestd;intMain () {cout<<"Hello world!"<<Endl; intA=Ten; intb= -;    Dlldemo dll; printf ("sum of A, B is:%d", Dll.addtwo (A, b));    Cv::mat Canvas; Canvas= Cv::imread ("d://lining.jpg", -1); Mat result=Dll.togray (canvas); Imshow ("DLL Result", result);    Waitkey (); return 0;}

Success

SOURCE download

Http://pan.baidu.com/s/1kT7QBbx

Making a dynamic link library for use with OPENCV programs (using Qtcreator)