Click to open or copy the HELLOAPP project files.
HELLOAPP is the minimal Microsoft Foundation Class Library (MFC) sample, and illustrates how few lines of code are required simply to get a window to appear on the screen. HELLOAPP is even simpler than the HELLO sample: HELLOAPP does not paint anything in the main window's client area, nor does it even have a message map for the main window. HELLOAPP is nevertheless instructive in that it demonstrates the minimal overhead required for a content-less application, as opposed to, for example, a WinMain type of application developed using the Microsoft Windows Software Development Kit.
When you run HELLOAPP, it displays "Hello World!" in the title bar of an empty application window.
Like any application written using MFC, HELLOAPP has a CWinApp-derived class. This application class provides a minimal implementation of InitInstance, which is to construct a frame window object (of the application-specific class CMainWindow), and then call the window's ShowWindow and UpdateWindow functions.
This sample demonstrates the following keywords:
CFrameWnd::Create; CFrameWnd::rectDefault; CWinApp::InitInstance; ShowWindow; UpdateWindow