OpenCV可以使用C++和C一起开发吗

Question

OpenCV可以同时使用C++和C开发吗？下面是我遇到这个问题的程序。它是用C编写的，运行良好。但是如果我使用

cv::Mat saveImage=cv::imread("D:\opencvStudy\opencv_test\TaskDemo\TaskDemo\save.jpg");
cv::imshow("save",saveImage);

取代

IplImage* saveImge =cvLoadImage("D:\opencvStudy\opencv_test\TaskDemo\TaskDemo\save.jpg");
cvShowImage("saveimage",saveImge);

我遇到了这个：

TaskDemo.exe中0x75709673处未处理的异常：Microsoft C++异常：cv:：内存位置0x0039ea0c处的异常

以下是整个程序。希望有人能帮我。非常感谢

#include<opencv/cv.h>
#include<opencv/highgui.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/video/tracking.hpp"

#include <iostream>
#include <ctype.h>
CvPoint pt1 = cvPoint(0,0);
CvPoint pt2 = cvPoint(0,0);
bool is_selecting = false;
void cvMouseCallback(int mouseEvent,int x,int y,int flags,void* param)
{
switch(mouseEvent)
{
case CV_EVENT_LBUTTONDOWN:
pt1 = cvPoint(x,y);
pt2 = cvPoint(x,y);
is_selecting = true;
break;
case CV_EVENT_MOUSEMOVE:
if(is_selecting)
pt2 = cvPoint(x,y);
break;
case CV_EVENT_LBUTTONUP:
pt2 = cvPoint(x,y);
is_selecting = false;
break;
}
return;
}
int main(int argc,char* argv[])
{
char img_path[80] = "D:\opencvStudy\pic\boldt.jpg";
char save_path[80] = "save.jpg";
char* window = "img";
IplImage* img = cvLoadImage(img_path);  
IplImage* img_show = cvCloneImage(img);
cvNamedWindow(window,CV_WINDOW_AUTOSIZE);
cvSetMouseCallback(window,cvMouseCallback);
char text[80];
CvFont font;
cvInitFont(&font,CV_FONT_HERSHEY_PLAIN,1.0,1.0);
while(true)
{
cvCopy(img,img_show);
cvRectangle(img_show,pt1,pt2,cvScalar(255,255,255));
sprintf(text,"roi = cvRect(%d,%d,%d,%d)",pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y));
cvPutText(img_show,text,cvPoint(10,20),&font,cvScalar(0,0,255));
cvShowImage(window,img_show);
char key = cvWaitKey(10);
if (key='r')
{
cvSetImageROI(img,cvRect(pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y)));
cvSaveImage(save_path,img);
cvResetImageROI(img);
IplImage* saveImge = cvLoadImage("D:\opencvStudy\opencv_test\TaskDemo\TaskDemo\save.jpg");
cvShowImage("saveimage",saveImge);
//cv::Mat saveImage=cv::imread("D:\opencvStudy\opencv_test\TaskDemo\TaskDemo\save.jpg");
//cv::imshow("save",saveImage);
}
else if(key==27)
break;
}
cvReleaseImage(&img);
cvReleaseImage(&img_show);
return 0;

}

更新

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/core/core.hpp"
#include <iostream>
#include <ctype.h>
using namespace std;
using namespace cv;
cv::Point pt1=Point(0,0);
cv::Point pt2=Point(0,0);
bool is_selecting=false;
static void onMouse(int mouseEvent,int x,int y,int flags,void* param)
{
switch(mouseEvent)
{
case CV_EVENT_LBUTTONDOWN://CV_EVENT_LBUTTONDOWN
pt1 = Point(x,y);
pt2 = Point(x,y);
is_selecting = true;
break;
case CV_EVENT_MOUSEMOVE:
if(is_selecting)
pt2 = Point(x,y);
break;
case CV_EVENT_LBUTTONUP:
pt2 = Point(x,y);
is_selecting = false;
break;
}
}
int main()
{
cv::Mat img=cv::imread("D:\opencvStudy\pic\boldt.jpg");
cv::Mat img_show=img.clone();
cv::namedWindow("Task2",0);
cv::setMouseCallback("Task2",onMouse,0);
char text[80];
while(true)
{
img.copyTo(img_show);
cv::rectangle(img_show,pt1,pt2,cv::Scalar(255,255,255));
sprintf(text,"roi = cvRect(%d,%d,%d,%d)",pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y));
cv::putText(img_show,text,cvPoint(10,20),10,10,Scalar(0,0,255));
cv::imshow("Task2",img_show);
char key=cv::waitKey(10);
if (key='r')
{
cv::Mat save=img(cv::Rect(pt1.x,pt1.y,std::abs(pt2.x-pt1.x),std::abs(pt2.y-pt1.y)));
cv::imwrite("save.jpg",save);
cv::Mat saveImage=cv::imread("D:\opencvStudy\opencv_test\TaskDemo\TaskDemo\save.jpg");
cv::imshow("save",saveImage);
}
else if(key==27)
break;
}
return 0;

}

Answer 1

问题在于标头冲突。你不应该像这样同时包括旧的和新的：

#include<opencv/cv.h>
#include<opencv/highgui.h>
#include "opencv2/highgui/highgui.hpp"

相反，只包含新的标头，如下所示：

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

原因是C++头中还包含了C接口。

更新：

当然，如果您使用cv:：Mat，那么您也需要为此使用新函数。

CvCopy变为cv:：copy，不需要cvReleaseImage，cvRectangle变为cv：：矩形，cvSetImageROI为img(rect)，cvPoint变为cv：：Point cvRect变为cv::rectcvCloneImage变成img.clone()等等…

或者，您需要将cv:：Mat转换为IplImage以使用旧函数。SO在处理来回转换时存在一些问题。

更新2:

最好删除所有cv::，因为您正在使用using namespace cv。

然后检查带有旧cv前缀的函数和变量，并删除这些前缀。(我仍然找到了一个：cvPoint)。

等一下，您正在使用char text[80]！

我认为这又是问题的根源。最好将其切换到

#include <sstream>
//...
stringstream ss;
ss << "Rect(" << pt1.x << ", " << ... << ")";
//...
putText(img_show, ss.str(), Point(10,20), FONT_HERSHEY_PLAIN, 1, Scalar(0, 0, 255) );

请注意，字体(我使用的)不是10，而是font_HERSHEY_PLAIN(或其他一些font_常量)。