调用调色板在对话框中画一条直线

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);
::ReleaseDC(m_hWnd, hdc);