gistfile1.h

      /**
       * Display video from webcam
       *
       * Author  Nash
       * License GPL
       * Website http://nashruddin.com
       */
       
      #include <stdio.h>
      #include <stdlib.h>
      #include "cv.h"
      #include "highgui.h"

     int main( int argc, char **argv )
      {
          CvCapture *capture = 0;
          IplImage  *frame = 0;
          int       key = 0;
          int i=0;
       
         /* initialize camera */
          capture = cvCaptureFromCAM( -1 );
       
          /* always check */
          if ( !capture ) {
              fprintf( stderr, "Cannot open initialize webcam!\n" );
              return 1;
         }
         printf("%d\n",i++);
       
          /* create a window for the video */
          cvNamedWindow( "result", CV_WINDOW_AUTOSIZE );
       
          while( key != 'q' ) {
          printf("%d\n",i++);
              /* get a frame */
              frame = cvQueryFrame( capture );
       
              /* always check */
              if( !frame ) break;
             
              /* display current frame */
              cvShowImage( "result", frame );
       
              /* exit if user press 'q' */
              key = cvWaitKey( 1 );
           usleep();
          }
       
          /* free memory */
          cvDestroyWindow( "result" );
          cvReleaseCapture( &capture );
       
          return 0;
      }