《学习opencv》第四章课后习题4

首先在项目属性-》配置属性-》链接器-》输入-》附加依赖项  中加入如下lib文件：

 opencv_imgproc220d.lib opencv_legacy220d.lib opencv_ml220d.lib opencv_core220d.lib opencv_highgui220d.lib opencv_video220d.lib 

// 4-4.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include<opencv/cv.h>#include<opencv/highgui.h>/*int g_switch_value = 1;void switch_off_function() {printf("Pause\n");}; //YOU COULD DO SOMETHING WITH THESE FUNCTIONS TOOvoid switch_on_function() {printf("Run\n");}; void switch_callback( int position ) {  if( position == 0 )   {    switch_off_function();  }   else   {    switch_on_function();  }} int main(){   IplImage *frame;    CvCapture* g_capture  = NULL;   if(!(g_capture = cvCreateFileCapture("C:\\test.avi")))   {   printf("Failed to open %s\n","C:\\test.avi");   return -1;   }  cvNamedWindow( "SliderControl", 1 );   cvCreateTrackbar(    "Switch",    "SliderControl",    &g_switch_value,    1,    switch_callback  );   while( 1 ) {    if(g_switch_value){     frame = cvQueryFrame( g_capture );    if( !frame ) break;    }    cvShowImage( "SliderControl", frame);    if(cvWaitKey(10)==27 ) break;  }    cvReleaseCapture( &g_capture );  cvDestroyWindow( "SliderControl" );  return(0);}*/int g_switch_value = 1;int g_slider_position = 0;CvCapture* g_capture = NULL;void onTrackbarSlide(int pos){    cvSetCaptureProperty(g_capture, CV_CAP_PROP_POS_FRAMES,pos);}void switch_callback( int position ) {  if( position == 0 )   {    printf("Pause\n");  }   else   {    printf("on\n");  }}int main(){    cvNamedWindow("Test Vedio Slide",CV_WINDOW_AUTOSIZE);g_capture = cvCreateFileCapture("C:\\test.avi");    int frames = (int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FRAME_COUNT);    int frameRate = (int)cvGetCaptureProperty(g_capture,CV_CAP_PROP_FPS);    if(frames!=0)    {        cvCreateTrackbar( "Switch","Test Vedio Slide",&g_switch_value,1,switch_callback);       cvCreateTrackbar("position","Test Vedio Slide", &g_slider_position, frames, onTrackbarSlide);    }    IplImage* frame;   while(g_slider_position<frames)    {if(g_switch_value==1){        frame = cvQueryFrame(g_capture);        if(!frame)            break;        cvShowImage("Test Vedio Slide", frame);        char c = cvWaitKey(frameRate);        cvSetTrackbarPos("position","Test Vedio Slide", g_slider_position);        onTrackbarSlide(g_slider_position);        if(c == 27)            break;g_slider_position++;}else{if(cvWaitKey(10)==27 ) break;}    }    cvReleaseCapture(&g_capture);    cvDestroyWindow("Test Vedio Slide");}