CODEWITHSUNDEEP
c++opencvvisual-c++
Rizky Satya
Rizky Satya

Reputation: 13

error convert cv::mat to cv::arr

I'm just trying to learn about OpenCV and i running on a x64 machine.

I am using OpenCV 3.2.0 with VS2015 before and I try to following step by step tutorial from Kyle Hounslow on youtube, but i get error.

then i reinstall using VS2013, but i still got error like below :

Error 1   error C2664: 'void cvShowImage(const char *,const CvArr *)' : cannot convert argument 2 from 'cv::Mat' to 'const CvArr *'
Error   2 IntelliSense: no suitable conversion function from "cv::Mat" to "const CvArr *" exists

i already see in link below but still doesn't work for me

OpenCV can't compile

i check on link below too, but i got confused

how to convert from cv::Mat to CvArr?

my code is like below :

#include<iostream>
#include<opencv\cv.h>
#include<opencv2\highgui\highgui.hpp>
#include<opencv2\videoio.hpp>
#include<opencv2\core.hpp>
#include<opencv2\imgproc\imgproc.hpp>


using namespace cv;

int main()
{

  Mat image;

  VideoCapture cap;
  cap.open(0);

  cvNamedWindow("window", 1);

  while (true)
  {
      cap >> image;

      cvShowImage("window", image);

      cvWaitKey(33);
  }


}

please help me in that, many thanks.

sorry, i delete the update because the original issue is already solved

many thanks

Upvotes: 1

Views: 2712

Answers (2)

slawekwin
slawekwin

Reputation: 6310

You are mixing old, obsolete C api (cvNamedWindow, cvShowImage, cvWaitKey) with new C++ api (Mat, VideoCapture). Don't do that. Drop the C api altogether. Everything named like cvFunctionName is obsolete. Use newer api that uses cv as a namespace, so names like cv::functionName are what you're supposed to be calling.

In your case it's cv::namedWindow, cv::imshow and cv::waitKey:

using namespace cv;

int main()
{
    Mat image;

    VideoCapture cap;
    cap.open(0);

    namedWindow("window", 1);
    while (true)
    {
        cap >> image;
        imshow("window", image);
        waitKey(33);
    }
}

Upvotes: 1

Mohamed Salama
Mohamed Salama

Reputation: 167

You should use imshow("window", image); if you need to use c++ Mat.

according to opencv docs

Displays an image in the specified window.

C++: void imshow(const string& winname, InputArray mat)

C: void cvShowImage(const char* name, const CvArr* image)

Upvotes: 1

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