绘制DIB对象,按照DIB创建一个逻辑调色板, 计算DIB像素的起始位置，并返回指向它的指针,返回DIB中图象的高度,返回DIB中调色板的大小,DIB中调色板的颜色的种数,

返回DIBBitCount,复制指定的内存区域,将指定的DIB对象保存到指定的CFile中,将指定的文件中的DIB对象读到指定的内存区域中 获取矩形区域的宽度,高度 初始化类的成员变量 复位类的成员变量.-Creating a logical palette DIB object is drawn, in accordance with the DIB calculated DIB pixel starting position, and returns a pointer to it, return to the height of the DIB image, and returns the size of the palette in the DIB, the DIB palette the color of the number of species, return DIBBitCount, copy the specified memory area specified DIB object is saved to the specified CFile DIB object in the specified file is read into the specified area of ​ ​ memory　obtain a rectangular area of ​ ​ width, height,　 initialize member variables of the class　reset class member variables.