Fullscreen/Windowed

fw.cpp

bool GoFullscreen()
{
	// turn off window region without redraw
	SetWindowRgn(m_hWindow, 0, false);

	DEVMODE newSettings;	

	// request current screen settings
	EnumDisplaySettings(0, 0, &newSettings);

	//  set desired screen size/res	
 	newSettings.dmPelsWidth  = GetWidth();		
	newSettings.dmPelsHeight = GetHeight();		
	newSettings.dmBitsPerPel = 32;		

	//specify which aspects of the screen settings we wish to change 
 	newSettings.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;

	// attempt to apply the new settings 
	long result = ChangeDisplaySettings(&newSettings, CDS_FULLSCREEN);

	// exit if failure, else set datamember to fullscreen and return true
	if ( result != DISP_CHANGE_SUCCESSFUL )	return false;
	else 
	{
		// store the location of the window
		m_oldLoc = GetLocation();

		// switch off the title bar
	    DWORD dwstyle = GetWindowLong(m_hWindow, GWL_style);
	    dwstyle &= ~WS_CAPTION;
	    SetWindowLong(m_hWindow, GWL_style, dwstyle);

		// move the window to (0,0)
		SetWindowPos(m_hWindow, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
		InvalidateRect(m_hWindow, 0, true);		

		return true;
	}
}

bool GoWindowedMode()
{
	// this resets the screen to the registry-stored values
  	ChangeDisplaySettings(0, 0);

	// replace the title bar
	DWORD dwstyle = GetWindowLong(m_hWindow, GWL_style);
    dwstyle = dwstyle | WS_CAPTION;
    SetWindowLong(m_hWindow, GWL_style, dwstyle);

	// move the window back to its old position
	SetWindowPos(m_hWindow, 0, m_oldLoc.x, m_oldLoc.y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);
	InvalidateRect(m_hWindow, 0, true);

	return true;
}