学习OPENCV的第一个例子

#include <highgui.h>
#include <cassert>
#include <iostream>
#include <Windows.h>
using namespace std;
void OnTrackbarSlide(int pos);int g_slider_position = 0;
CvCapture *g_capture = NULL;
int main(int argc , char ** argv)
{assert(argc == 2);cvNamedWindow("Example2",CV_WINDOW_AUTOSIZE);g_capture = cvCreateFileCapture(argv[1]);assert(g_capture != NULL);int frames = (int) cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);int fps = (int) cvGetCaptureProperty(g_capture,CV_CAP_PROP_FPS);const int step_time = 1000 / fps ;if(frames != 0){cvCreateTrackbar("Position","Example2",&g_slider_position,frames,OnTrackbarSlide);}IplImage *frame ;while(1){frame = cvQueryFrame(g_capture);if(frame == NULL)break;cvShowImage("Example2",frame);if(++g_slider_position % fps == 0)cvSetTrackbarPos("Position","Example2",++g_slider_position);char c = cvWaitKey(step_time);if(c == 27)break;}cvReleaseCapture(&g_capture);cvDestroyWindow("Example2");}void OnTrackbarSlide(int pos)
{cvSetCaptureProperty(g_capture,CV_CAP_PROP_POS_FRAMES,pos);
}

OnTrackbarSlide(int pos)为滑块的回调函数.

别的函数可以忘文生义

运行之前请安装好opencv库,再在依赖库中设置好比如我用的opencv 2.1 

 cvcore210d.lib cv210d.lib highgui210d.lib