file read from visual c++ but nothing is displayed

[khalid farooq]

*
* hello.c
* This is a simple, introductory OpenGL program.
*/


#include<stdlib.h>
#include <GL/glut.h>
#include<iostream>
#include<fstream>

using std::fstream;
using namespace std;

void draw(void)
{
* clear all pixels */
char fileName[] = "house1.txt";
fstream instream;
instream.open("c:/house1.txt",ios::in);
if(instream.fail())
return;
glClear (GL_COLOR_BUFFER_BIT);
GLint numstrip,numlines;
GLfloat x,y;
instream>>numstrip;
for(int j=0;j<numstrip;j++)
{
instream>>numlines;
glBegin(GL_LINE_STRIP);
for(int i=0;i<numlines;i++)
{

instream>>x>>y;
glVertex2f(x,y);

}



}

* draw white polygon (rectangle) with corners at
* (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)
*/
glColor3f (1.0, 1.0, 1.0);

glEnd();

* don't wait!
* start processing buffered OpenGL routines
*/
glFlush ();
}

void init (void)
{
* select clearing color */
glClearColor (0.0, 0.0, 0.0, 0.0);

* initialize viewing values */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}

*
* Declare initial window size, position, and display mode
* (single buffer and RGBA). Open window with "hello"
* in its title bar. Call initialization routines.
* Register callback function to display graphics.
* Enter main loop and process events.
*/
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (640, 480);
glutInitWindowPosition (100, 100);
glutCreateWindow ("hello");
init ();
glutDisplayFunc(draw);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}