virtual BOOL InitInstance();
Windows allows several copies of the same program to be running at the same time. Thus, application initialization is conceptually divided into two sections: one-time application initialization that is done the first time the program runs and instance initialization that runs each time a copy of the program runs, including the first time. This function is called by the Foundation library implementation of WinMain. Override InitInstance to provide initialization for each new instance of your application running under Windows. Typically, you override InitInstance to construct your main window object and set m_pMainWnd to point to that window, as shown here.
BOOL CDerivedApp::InitInstance()
{
m_pMainWnd = new CDerivedWindow();
m_pMainWnd->ShowWindow( m_nCmdShow );
m_pMainWnd->UpdateWindow();
return TRUE;
}
TRUE if initialization is successful; otherwise FALSE.