We are encountering SEH exceptions when calling cvGetSize for a CvMat.
Here is small example:
using System;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
internal struct _CvMat
{
public int type;
public int step;
public IntPtr refcount;
public int hdr_refcount;
public IntPtr data;
public int rows;
public int cols;
}
public struct Size
{
public int Width;
public int Height;
}
unsafe class Program
{
[DllImport("opencv_world300", CallingConvention = CallingConvention.Cdecl)]
internal static extern Size cvGetSize(_CvMat* arr);
[DllImport("opencv_world300", CallingConvention = CallingConvention.Cdecl)]
internal static extern _CvMat* cvCreateMat(int rows, int cols, int type);
[DllImport("opencv_world300", CallingConvention = CallingConvention.Cdecl)]
internal static extern void cvReleaseMat(ref _CvMat* mat);
static void Main(string[] args)
{
var ptr = cvCreateMat(30, 30, 0);
Size size = cvGetSize(ptr); // Causes SEH exception
cvReleaseMat(ref ptr);
}
}
}
This problem seems to be existing in 2.4.x as well, as Emgu.CV (popular C# Wrapper) is not using a cvGetSize, instead directly using the CvMat rows and cols members with a comment that the call is not working.
When doing the same in pure C the function calls are working as expected. In C# only this specific function is causing a problem.
The calling convention is correct, the types seem to be correctly defined.
When looking at the members of the CvMat when calling cvGetSize, type and step are set to 0 before the error occurs.
Can anyone reproduce this?
Anybody knows where this comes from?
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