Deleting a Rendering Context

The following code sample shows how to delete an OpenGL rendering context when an OpenGL window is closed. It is a continuation of the scenario used in Creating a Rendering Context and Making It Current.

// a window is about to be destroyed  
case WM_DESTROY: 
    { 
    // local variables  
    HGLRC    hglrc; 
    HDC      hdc ; 
 
    // if the thread has a current rendering context ...  
    if(hglrc = wglGetCurrentContext()) { 
 
        // obtain its associated device context  
        hdc = wglGetCurrentDC() ; 
 
        // make the rendering context not current  
        wglMakeCurrent(NULL, NULL) ; 
 
        // release the device context  
        ReleaseDC (hwnd, hdc) ; 
 
        // delete the rendering context  
        wglDeleteContext(hglrc); 
 
        }