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Mouse select 3D object

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Can someone direct me to an example of code that uses the mouse to select a 3D object. What I mean is if you use the mouse (which is in 2D) to click on a 3D box you've created, you get a cout or something. I see this all the time in games like guild wars... Thank for any help.

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void Selection::GetOGLPos()
GLint viewport[4];
GLdouble projection[16];
GLdouble modelview[16];
GLfloat winX, winY, winZ;
glGetDoublev( GL_MODELVIEW_MATRIX, modelview ); //Get modelMatrix
glGetDoublev( GL_PROJECTION_MATRIX, projection ); //Get projectionMatrix
glGetIntegerv( GL_VIEWPORT, viewport ); //Get windowsMatrix
winX = (float)m_iX; //MousePosX
winY = (float)viewport[3] - (float)m_iY; //MousePosY (opengl from buttom to top ,so Sub...)
glReadPixels( m_iX, int(winY), 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ );
//Get Select pixle Z-Buffer
gluUnProject( winX, winY, winZ, modelview, projection, viewport, &m_CoordInWorld[0], &m_CoordInWorld[1], &m_CoordInWorld[2]); //m_CoordInWorld[] hold x,y,z in world
If you get the point's coord[] which you select , you can test this point if it's in the
Object's Culling Box
those code work well on my computer ..so , I think it can help you

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