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Hi everyone. I wrote wrapper in Visual Studio for OpenCV calibrateCamera() function. Every operation like converting 1D array of points to vector<vector<Point2f>> etc, works ok, except most important thing. When function ()calibrateCamera is called, LabVIEW crashes. When this line is commented out, dll works ok (at least labview is still alive). Im out of ideas. I suspect that this is problem with memory management but i dont have an idea where it cames from. Function do not operate directly on data passed from LabVIEW. Ultimately I can compile code as exe and call it via cmd, but I'm curious why such a thing appears. Thanks for your precious time! Zyga dll source (if you need i can enclose some sample input data): #include <opencv2/core/core.hpp> #include <opencv2/calib3d/calib3d.hpp> #include <extcode.h> using namespace cv; using namespace std; static void calcBoardCornerPositions(Size boardSize, float squareSize, vector<Point3f> &corners); static void arr2vect(float *APoints,int *Asize, vector<vector<Point2f>> &imagePoints); extern "C" { float __declspec(dllexport) Calibrate(float *APoints, int *Asize, int width, int height, float squareSize) { //initialize variables vector<vector<Point2f>> imagePoints; Size boardSize; boardSize.height = height; boardSize.width = width; Mat cameraMatrix = Mat::eye(3, 3, CV_64F), distCoeffs = Mat::zeros(1, 1, CV_64F); cameraMatrix.at<double>(0,0) = 1.0; vector<Mat> rvecs, tvecs; vector<vector<Point3f>> objectPoints(1); Size imageSize; imageSize.width = 2040; imageSize.height = 2040; arr2vect(APoints, Asize, imagePoints); // prepare imagePoints calcBoardCornerPositions(boardSize, squareSize, objectPoints[0]); //prepare objectPoints objectPoints.resize(imagePoints.size(),objectPoints[0]); //calibrate double rms = calibrateCamera(objectPoints, imagePoints, imageSize, cameraMatrix, distCoeffs, rvecs, tvecs); return rms; } } //definitions static void arr2vect(float *APoints,int *Asize, vector<vector<Point2f>> &imagePoints) { int page = *(Asize); int row = *(Asize+1); int col = *(Asize +2); Point2f pointBuf; vector<Point2f> vectBuf; for (int i = 0; i<page; i++) { for (int j = 0; j<row; j++) { pointBuf.x = *(APoints + (i*(row*col))+j*2); pointBuf.y = *(APoints + (i*(row*col))+j*2+1); vectBuf.push_back(pointBuf); } imagePoints.push_back(vectBuf); vectBuf.clear(); } vectBuf.clear(); } static void calcBoardCornerPositions(Size boardSize, float squareSize, vector<Point3f> &corners) { corners.clear(); for( int i = 0; i < boardSize.height; ++i ) for( int j = 0; j < boardSize.width; ++j ) corners.push_back(Point3f(float( j*squareSize ), float( i*squareSize ), 0)); }

Hi guys, I have a wrapper to a DLL which was written in C, now the DLL used from the wrapper was updated to a new version, so I have to reload the DLL into the "Call library function" for each function of the wrapper that I've already created and it is a very boring job. Therefore, I would like to know if exists a trick to use to update all functions of a dll wrapper in one shot? Does it exist?