cv::setMouseCallback with winforms (OpenCV 2.4.9,vs 2010)

asked 2016-03-03 06:47:54 -0600

kazar13
6 ●1 ●2

updated 2020-06-10 20:59:02 -0600

supra56

943 ●9 ●6

Hi ! Im working with OpenCV 2.4.9 with winforms (vs 2010).

Im trying to use cv::setMouseCallback with winforms of vs 2010. I have a mouse callback:

void mouse_call(int event,int x,int y, int, void*){
}

and then:

   cv::Mat img = cv::imread("f:/open/me.jpg");
   cv::namedWindow("Original");
   cv::imshow("Original",img);

 cv::setMouseCallback("Original", mouse_call, this);

I get an error:

error C3867: 'DCS_new::Evaluation_module_3::mouse_call': function call missing argument list; use '&DCS_new::Evaluation_module_3::mouse_call' to create a pointer to member

Any help please ?

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answered 2016-03-03 07:28:19 -0600

berak
32993 ●7 ●81 ●312

since you have to pass the address of a free function (not a class member) to setMouseCallback(), you need:

static void mouse_call(...)

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This produces following error:

error C2664: 'cv::setMouseCallback' : cannot convert parameter 2 from 'void (__clrcall *)(int,int,int,int,void *)' to 'cv::MouseCallback'
None of the functions with this name in scope match the target type