[英]Unity Plugin : Marshal C++ double* to double Array in C#
I'm struggling with Unity and the plugin system using a C++ Dll. 我正在努力使用Unity和使用C ++ Dll的插件系统。 Basically I have a Dll in C++ that find the extrinsic parameters of camera knowing the intrinsic parameters.
基本上,我在C ++中有一个Dll,可在知道固有参数的情况下找到相机的外部参数。 The function runs smoothly when I create a .exe.
创建.exe时,该功能运行平稳。
What i'm trying to do is using that function in Unity via a Dll in C++ to get the extrinsic parameters stored in a 1D double Array. 我想做的是通过C ++中的Dll在Unity中使用该函数来获取存储在一维双数组中的外部参数。
I've read a lot about exporting functions in Dll and Importing them in C#, but I've spend 4 days of work and nothing works. 我已经阅读了很多有关在Dll中导出函数并在C#中导入它们的知识,但是我花了4天的时间,但没有任何效果。
I always get the same error : Runtime Error and Unity crashes (Memory access problem I think). 我总是得到相同的错误:运行时错误和Unity崩溃(我认为是内存访问问题)。
Here is the C++ code 这是C ++代码
#include <opencv2\opencv.hpp>
#include <stdio.h>
#ifdef CALIBRATION_EXPORTS
#define CALIBRATION_API __declspec(dllexport)
#else
#define CALIBRATION_API __declspec(dllimport)
#endif
using namespace cv;
using namespace std;
class CALIBRATION_API calib
{
public:
calib();
virtual ~calib();
void calcBoardCornerPosititions(Size boardSize, double squareSize, vector<Point3f>& corners);
Mat Nextimage(VideoCapture camera);
void find_extrinsic(double* Mat_Ext, double mat_int[], double mat_dist[], int size_ext, int size_int, int size_dist);
private :
VideoCapture camera;
};
extern "C" CALIBRATION_API calib* CreateCalib()
{
return new calib();
}
extern "C" CALIBRATION_API void DisposeCalib( calib* pObject)
{
if (pObject != NULL)
{
delete pObject;
pObject = NULL;
}
}
void calib::find_extrinsic(double *Mat_Ext, double mat_int[], double mat_dist[], int size_ext, int size_int, int size_dist)
{
if (size_ext == 16 && size_int == 9 && size_dist == 5)
{
Size boardSize = Size(9, 6);
double squareSize = 245;
//Matrices de résultats param ext
Mat_<double> rvecs_ext(3, 3);
Mat_<double> tvecs_ext(3, 1);
vector<Point3f> objectPoints_ext;
int id = 0;
Mat_<double> cameraMatrix(3, 3);
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
cameraMatrix.data[i, j] = mat_int[id];
id++;
}
}
Mat_<double> distCoeffs(5, 1);
for (int i = 0; i < 5; i++)
{
distCoeffs.data[i, 1] = mat_dist[i];
}
Mat result = Nextimage(camera);
Size imageSize = result.size();
vector<Point2f> pointBuf;
bool found = findChessboardCorners(result, boardSize, pointBuf, CALIB_CB_FAST_CHECK + CALIB_CB_FILTER_QUADS);
if (found)
{
calcBoardCornerPosititions(boardSize, squareSize, objectPoints_ext);
solvePnP(objectPoints_ext, pointBuf, cameraMatrix, distCoeffs, rvecs_ext, tvecs_ext, false, CV_ITERATIVE);
Mat_Ext[0] = rvecs_ext.at<double>(0, 0);
Mat_Ext[1] = rvecs_ext.at<double>(0, 1);
Mat_Ext[2] = rvecs_ext.at<double>(0, 2);
Mat_Ext[3] = tvecs_ext.at<double>(0, 0);
Mat_Ext[4] = rvecs_ext.at<double>(1, 0);
Mat_Ext[5] = rvecs_ext.at<double>(1, 1);
Mat_Ext[6] = rvecs_ext.at<double>(1, 2);
Mat_Ext[7] = tvecs_ext.at<double>(0, 2);
Mat_Ext[8] = rvecs_ext.at<double>(2, 0);
Mat_Ext[9] = rvecs_ext.at<double>(2, 1);
Mat_Ext[10] = rvecs_ext.at<double>(2, 2);
Mat_Ext[11] = rvecs_ext.at<double>(0, 3);
Mat_Ext[12] = rvecs_ext.at<double>(3, 0);
Mat_Ext[13] = rvecs_ext.at<double>(3, 1);
Mat_Ext[14] = rvecs_ext.at<double>(3, 2);
Mat_Ext[15] = 1;
}
}
}
}
extern"C" CALIBRATION_API void Call_find_extrinsic(calib* pObject, double *Mat_Ext, double mat_int[], double mat_dist[], int size_ext, int size_int, int size_dist)
{
if (pObject != NULL)
{
pObject->find_extrinsic(Mat_Ext, mat_int, mat_dist,size_ext,size_int,size_dist);
}
}
And the revelant C# code: 以及相关的C#代码:
[DllImport("Beta.dll")]
public static extern IntPtr CreateCalib();
[DllImport("Beta.dll")]
public static extern void DisposeCalib(IntPtr pCalibObject);
[DllImport("Beta.dll")]
public static extern void Call_find_extrinsic(IntPtr pCalibObject, double[] pMat_Ext, double[] mat_int, double[] mat_dist,
int size_ext, int size_int, int size_dist);
pCalibClass = CreateCalib();
double[]test_ext = new double[16];
Call_find_extrinsic(pCalibClass, test_ext,Intrinsic_mat,Dist_mat,test_ext.Length,Intrinsic_mat.Length,Dist_mat.Length);
I try to fill the test_ext with the value calculated by the find_extrinsic method. 我尝试用find_extrinsic方法计算的值填充test_ext。
Could you plz help me to solve that. 您能帮我解决这个问题吗?
Thanks a Lot! 非常感谢!
The calling conventions of the C++ and C# functions are not matched, __cdecl is the default calling convention for C and C++ programs, while __stdcall is the default if you don't specify it explicitly in the [DllImport] attribute. C ++和C#函数的调用约定不匹配,__ cdecl是C和C ++程序的默认调用约定,而__stdcall是默认的(如果您未在[DllImport]属性中明确指定)。 If the conventions are not matched, it leads to crash because of stack damage.
如果约定不匹配,则会由于堆栈损坏而导致崩溃。
Please refer this for details. 有关详细信息,请参考此内容。
So you should add CallingConvention = CallingConvention.Cdecl
in the [DllImport] declaration. 因此,您应该在[DllImport]声明中添加
CallingConvention = CallingConvention.Cdecl
。
rvecs_ext is not supposed to be a 3x3 matrix, instead it is a 3x1 vector. rvecs_ext不应该是3x3矩阵,而是3x1向量。 hence it crashes as you are accessing forbidden memory space.
因此,当您访问禁止的内存空间时,它会崩溃。
The 3x1 vector is the diagonal of the rotation matrix, other elements are considered as null. 3x1向量是旋转矩阵的对角线,其他元素视为空值。 why ?
为什么呢? take a look at this
看看这个
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