OpenCV学习笔记3_ShowAvi_Trackbar_加载视频，并添加拖动条

ShowAvi_Trackbar_加载视频，并添加拖动条

ShowAvi_Trackbar.c

/* 
* Copyright (c++) 2013,合肥学院智能视觉与检测实验室 
* All rights reserved. 
* 
* 文件名称：ShowAvi_Trackbar.c
* 摘    要：加载视频，并添加拖动条
* 
* 当前版本：1.0 
* 作    者：高全宁 
* 完成日期：2013年5月7日
*
*亲测有效 
*/ 

#include "stdafx.h"

#include "cv.h"
#include "highgui.h"
#include "cxcore.h"

CvCapture* g_capture = NULL;
int g_slider_pos = 0;
int frame_count = 0;

void onTrackbarSlider(int pos)
{
    cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES, pos);
    frame_count = pos;
}

int main()
{
    cvNamedWindow("show");
    g_capture = cvCreateFileCapture("F:\\who_is_your_favourite.avi");

    int frames = (int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);

    if (frames > 0)
    {
        cvCreateTrackbar("position","show",&g_slider_pos,frames,onTrackbarSlider);
    }
    
    IplImage* frame;
    while (1)
    {
        frame = cvQueryFrame(g_capture);
        if (!frame)
        {
            break;
        }

        cvShowImage("show",frame);

        char c = cvWaitKey(33);
        if(c == 27)
        {
            break;
        }

        cvSetTrackbarPos("position","show",frame_count);
        frame_count++;
    }

    cvReleaseCapture(&g_capture);
    cvDestroyWindow("show");

    return 0;
}

ShowAvi_Trackbar.cpp
待补