Visual C++ and MFC Programming 2nd Edition

Chapter 5: The Document/View Architecture Visual C++ and MFC Fundamentals

};

BOOL CSimpleApp::InitInstance()

{

#ifdef _AFXDLL

Enable3dControls( );

#else

Enable3dControlsStatic();

#endif

CSimpleFrame *Tester = new CSimpleFrame ();

m_pMainWnd = Tester;

Tester->ShowWindow(SW_SHOW);

Tester->UpdateWindow();

return TRUE;

}

CSimpleApp theApp;

To provide your application the ability to create a new document, the CWinApp class

provides the OnFileNew() method. Its syntax is:

afx_msg void OnFileNew();

To use this method, create a menu item identified as ID_FILE_NEW. You should also

create a prompt for it so the menu item can be added to the string table. This menu item is

traditionally and obviously added to the File menu. After creating this menu item, in the

message table of the application's source, invoke the CWinApp::OnFileNew() method

using the ON_COMMAND() macro. This can be done as follows:

BEGIN_MESSAGE_MAP(CExoApp, CWinApp)

ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)

END_MESSAGE_MAP()

CWinApp also provides an application the ability to easily open a document. This is done

using the OnFileOpen() method. In the same way, it can help with printing a document.

Here is a summary:

Menu ID CWinApp Message Map

ID_FILE_NEW ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)

ID_FILE_OPEN ON_COMMAND(ID_FILE_OPEN,

CWinApp::OnFileOpen)

ID_FILE_PRINT_SETUP ON_COMMAND(ID_FILE_PRINT_SETUP,

CWinApp::OnFilePrintSetup

One of the last minute assignment you may need to perform when the user is closing an

application is to check if the displayed document is "dirty", that is, if the document has

been changed since it was last accessed. To help with this, simply create a menu item

identified as ID_APP_EXIT and set a caption accordingly, such as the Exit menu we

created in the previous Practical Learning section. It is always helpful to add a prompt to

a menu item.

These command messages are implemented in the CWinApp class and can be helpful for

your application. If their behavior does not fulfill your goal, you can write your own

intended implementation of these menu items.