Create opencv program in windows forms application

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C++

Visual-Studio

VS2010

OpenCV

Hi, iam implementig a program to load an image to picture box using open

FileDialog1

control and mark some points on that image. I was able to load the image to the pictureBox.I have declared a class called CvCreatePoints to mark points uisng CvPoint() function. But i dont know how to pass that pictureBox image to

CvCreatePoints

class.

Below is my code

In Form1.h Inside Button click event

openFileDialog1->Filter = "Jpeg |*.Jpg";
                  openFileDialog1->FilterIndex = 1;
                    if (openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK )
                    {
                     pictureBox1->Image = Image::FromFile(openFileDialog1->FileName);
                    }

Then i have mouse_down event and there i tried to get the points when user clicks and pass them to the CvCreatePoints class. There i have a method called DrawPoints

CvCreatePoints cp;		 
 Point xy;
 xy = Control::MousePosition::get();
			 
 int xVal = xy.X;
 int yVal = xy.Y;
 cp.DrawPoints(pictureBox1->Image,xVal,yVal);

In my CvCreatePoints.h i have DrawPoints method

CvCreatePoints(void);
    void DrawPoints(IplImage *img, int x,int y);

in CvCreatePoints.cpp class

void CvCreatePoints::DrawPoints(IplImage *image, int x,int y)
{

}

When compiled,

cannot convert parameter 1 from 'System::Drawing::Image ^' to 'IplImage *'

error is given. So how do i cast

System::Drawing::Image to 'IplImage

Also

1>E:\Softwarez\OPENCV_DIR\Opencv243\build\include\opencv2/core/types_c.h(305): error C3862: 'cvRound': cannot compile an unmanaged function with /clr:pure or /clr:safe
1>          Inline native assembly not supported in managed code
1>E:\Softwarez\OPENCV_DIR\Opencv243\build\include\opencv2/core/types_c.h(305): error C3645: 'cvRound' : __clrcall cannot be used on functions compiled to native code
1>  MatlabToOpenCv.cpp
1>E:\Softwarez\OPENCV_DIR\Opencv243\build\include\opencv2/core/types_c.h(305): error C3862: 'cvRound': cannot compile an unmanaged function with /clr:pure or /clr:safe
1>          Inline native assembly not supported in managed code
1>E:\Softwarez\OPENCV_DIR\Opencv243\build\include\opencv2/core/types_c.h(305): error C3645: 'cvRound' : __clrcall cannot be used on functions compiled to native code

I don't understand this error :(
Thank you