c++ - 段错误，找不到我做错的地方

Question

我找不到在我的树莓派 C++ 代码中哪里做错了，它给了我一个段错误，但在查找了 4 个小时并在这里搜索后，我没有发现任何错误

据我所知，当一个程序试图访问不属于他的内存时，就会发生段错误，但我在任何地方都没有看到这种情况发生。

我基本上是想用树莓派模块找到一个特定颜色的对象

#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <unistd.h>
#include "RaspiCamCV.h"

using namespace cv;

int main(int argc, char *argv[ ]){

    RASPIVID_CONFIG * config = (RASPIVID_CONFIG*)malloc(sizeof(RASPIVID_CONFIG));

    config->width=320;
    config->height=240;
    config->bitrate=0;      // zero: leave as default
    config->framerate=0;
    config->monochrome=0;

    int opt;

    while ((opt = getopt(argc, argv, "lxm")) != -1)
    {
        switch (opt)
        {
            case 'l':                                       // large
                config->width = 640;
                config->height = 480;
                break;
            case 'x':                                       // extra large
                config->width = 960;
                config->height = 720;
                break;
            case 'm':                                       // monochrome
                config->monochrome = 1;
                break;
            default:
                fprintf(stderr, "Usage: %s [-x] [-l] [-m] \n", argv[0], opt);
                fprintf(stderr, "-l: Large mode\n");
                fprintf(stderr, "-x: Extra large mode\n");
                fprintf(stderr, "-l: Monochrome mode\n");
                exit(EXIT_FAILURE);
        }
    }

    /*
     Could also use hard coded defaults method: raspiCamCvCreateCameraCapture(0)
     */
    RaspiCamCvCapture * capture = (RaspiCamCvCapture *) raspiCamCvCreateCameraCapture2(0, config);
    free(config);

    CvFont font;
    double hScale=0.4;
    double vScale=0.4;
    int    lineWidth=1;

    cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX|CV_FONT_ITALIC, hScale, vScale, 0, lineWidth, 8);

    cvNamedWindow("RaspiCamTest", 1);
    int exit = 0;
    IplImage* x;
    IplConvKernel* erodeElement;
    IplConvKernel* dilateElement;

    printf("start");


    do {
        IplImage* image = raspiCamCvQueryFrame(capture);
        cvCvtColor(image, x, COLOR_BGR2HSV);

        cvInRangeS(&x, cvScalar(0,137,171), cvScalar(48,256,248), x);

        char text[200];
        sprintf(text, "Press ESC to exit");
        cvPutText(x, text, cvPoint(05, 80), &font, cvScalar(255, 255, 0, 0));

        printf("hi");

        erodeElement = cvCreateStructuringElementEx(3,3,-1,-1,MORPH_RECT);
        dilateElement = cvCreateStructuringElementEx(6,6,-1,-1,MORPH_RECT);

        cvErode(x,x,erodeElement);
        cvErode(x,x,erodeElement);

        cvDilate(x,x,dilateElement);
        cvDilate(x,x,dilateElement);



        cvShowImage("RaspiCamTest2", static_cast<CvArr*>(&x));
        cvShowImage("RaspiCamTest", image);

        char key = cvWaitKey(10);

        switch(key)
        {
            case 27:                // Esc to exit
                exit = 1;
                break;
            case 60:                // < (less than)
                raspiCamCvSetCaptureProperty(capture, RPI_CAP_PROP_FPS, 25);    // Currently NOOP
                break;
            case 62:                // > (greater than)
                raspiCamCvSetCaptureProperty(capture, RPI_CAP_PROP_FPS, 30);    // Currently NOOP
                break;
        }

    } while (!exit);

    cvDestroyWindow("RaspiCamTest");
    raspiCamCvReleaseCapture(&capture);
    return 0;
}

Answer 1

这可能不是唯一的问题，但是当您将 x 传递给 cvCvtColor 时，它未被初始化。您传递给 cvCvtColor 的 dst 指针需要指向“与源图像具有相同数据类型的目标图像”。 (来自this page)

这意味着 cvCvtColor 调用将写入内存中的随机位置，可能立即或稍后导致崩溃。