图形设备接口—GDI[1]

    ON_COMMAND(ID_DRAW_LINE,line)
    ON_COMMAND(ID_DRAW_RECT,rect)
    ON_COMMAND(ID_DRAW_ROUND_RECT,round_rect)
    ON_COMMAND(ID_DRAW_CIRCLE,circle)
    ON_COMMAND(ID_DRAW_CURVE,curve)

    我们有消息映射，在添加消息映射处理函数

    void line()
    {
        ::MessageBox(0,"line","消息",MB_OK);
    }
    void rect()
    {
        ::MessageBox(0,"rect","消息",MB_OK);
    }
    void round_rect()
    {
        ::MessageBox(0,"round_rect","消息",MB_OK);
    }
    void circle()
    {
        ::MessageBox(0,"circle","消息",MB_OK);
    }

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