鼠标事件,类似Trackbar的使用方法,用cvSetMouseCallback()这个函数,也要给cvSetMouseCallback()一个 onMouse()事件的函数,且事件函数规定要一定的参数格式(int event,int x,int y,int flags,void* param ),函数名称则可以自己定义,这边拿Webcam视频播放程序代码做修改.

鼠标事件测试
#include <cv.h>
#include <highgui.h>
#include <stdio.h>

void onMouse(int event,int x,int y,int flags,void* param );

int main()
{
    CvCapture *capture;
    IplImage *frame;

    capture =cvCaptureFromCAM(0) ;
    cvNamedWindow("Webcam",0);
    cvSetMouseCallback("Webcam",onMouse,NULL);

    while(true)
    {
        frame = cvQueryFrame(capture);

        cvShowImage("Webcam",frame);

        if(cvWaitKey(10)>=0)
        {
            break;
        }
    }
    cvReleaseCapture(&capture);
    cvDestroyWindow("Webcam");
}
void onMouse(int Event,int x,int y,int flags,void* param )
{
    printf("( %d, %d) ",x,y);
    printf("The Event is : %d ",Event);
    printf("The flags is : %d ",flags);
    printf("The param is : %d\n",param);
}

执行结果:

(1)滑动事件

(2)点击事件