CColorDialog dlg;
	dlg.DoModal();	
	COLORREF	m_crCurColor;
	m_crCurColor = dlg.GetColor();
	CPen m_pen(PS_SOLID,1,m_crCurColor);
	HDC hdc = ::GetDC(m_hWnd);
	SelectObject(hdc, m_pen);
	::MoveToEx(hdc, 0, 0, NULL);
	::LineTo(hdc, 100, 100);
	::Ellipse(hdc,100,100,200,200);
	::Rectangle(hdc,100,100,200,200);
	::ReleaseDC(m_hWnd, hdc);
	DeleteObject(m_pen);

使用调色板在对话窗中画图