Clock Screen Saver

// Saver.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "saver.h"
#include "ClockSaverWnd.h"

#include "ClockSaverConfigDialog.h"
#include "MyCommandLineInfo.h"

#include <cmath>

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CSaverApp

double pi;

BEGIN_MESSAGE_MAP(CSaverApp, CWinApp)
	//{{AFX_MSG_MAP(CSaverApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG
	ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSaverApp construction

CSaverApp::CSaverApp()
{
	pi = 4.0 * ::atan( 1.0 ); // initialize the global value of pi
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CSaverApp object

CSaverApp theApp;

//*****************************************************************************
/////////////////////////////////////////////////////////////////////////////
// CSaverApp initialization
//-----------------------------------------------------------------------------
BOOL CSaverApp::InitInstance()
{
	// Standard initialization
	// If you are not using these features and wish to reduce the size
	//  of your final executable, you should remove from the following
	//  the specific initialization routines you do not need.

	InitCommonControls();

	::CoInitialize( NULL );

	SetRegistryKey(IDS_REG_KEY);

	CMyCommandLineInfo commandLine;
	CWinApp::ParseCommandLine( commandLine );

	if ( commandLine.m_saver )
		DoSaver();

	else if ( commandLine.m_preview )
		DoPreview( commandLine.m_hWndParent );

	else if ( commandLine.m_config )
		DoConfig( commandLine.m_hWndParent );

	else if ( commandLine.m_password )
		DoChangePassword( commandLine.m_hWndParent );

	return m_pMainWnd != NULL;
}

void CSaverApp::DoSaver()
{
	CClockSaverWnd *pWnd = new CClockSaverWnd();
	pWnd->Create();
	pWnd->ShowWindow( TRUE );

	m_pMainWnd = pWnd;
}

void CSaverApp::DoPreview(HWND hWndParent)
{
	// the preview command is when the window shows up on the screen saver tab
	// on the screen properties dialog. For it to work we must have a valid HWND from
	// the command line
	if ( hWndParent != NULL )
	{
		CWnd *pWndParent = CWnd::FromHandle( hWndParent );
		ASSERT( pWndParent != NULL );

		CClockWnd *pWnd = new CClockWnd();
		CRect rect;
		pWndParent->GetClientRect( &rect );
		pWnd->Create(0, CString( reinterpret_cast<LPCTSTR>(IDS_PREVIEW)), WS_VISIBLE | WS_CHILD, rect, pWndParent );
		pWnd->SetParent( pWndParent );

		m_pMainWnd = pWnd;
	}
}

void CSaverApp::DoConfig(HWND hWndParent)
{
	// this is primarily so we can run the config dialog from the debugger
	if ( hWndParent == NULL )
		hWndParent = ::GetDesktopWindow();

	CClockSaverConfigDialog dlg( CWnd::FromHandle( hWndParent ) );

	if ( dlg.DoModal() == IDOK )
		dlg.Save();
}

void CSaverApp::DoChangePassword(HWND hWndParent)
{
	// This only gets called on Windows 9x, when started with the /a option.
	HINSTANCE hmpr = ::LoadLibrary(_T("MPR.DLL"));

	if (hmpr != NULL)
	{
		typedef VOID (WINAPI *PPWDCHANGEPASSWORD)
			(LPCSTR lpcRegkeyname, HWND hWnd,
			 UINT uiReserved1, UINT uiReserved2);

		PPWDCHANGEPASSWORD pPwdChangePassword =	reinterpret_cast<PPWDCHANGEPASSWORD>(::GetProcAddress(hmpr, "PwdChangePasswordA"));

		if (pPwdChangePassword != NULL)
			pPwdChangePassword("SCRSAVE", hWndParent, 0, 0);
		else
			TRACE(_T("PwdChangeProc not found: cannot change password.\n"));
	
		::FreeLibrary(hmpr);
	}
	else
		TRACE(_T("MPR.DLL not found: cannot change password.\n"));
}

BOOL CSaverApp::ExitInstance(void)
{
	::CoUninitialize();
	return CWinApp::ExitInstance();
}