个低级的BMP图像读写程序，代码内有丰富的注释。改变灰度图像的颜色表蓝色分量的值,察看前后变化，将图像数据存盘，清除缓冲区，pBmpBuf和pColorTable是全局变量，在文件读入时申请的空间-A low-level BMP image read and write procedures, the code is well commented. Change the gray-scale image of the value of the blue component of the color table, look at before and after the changes, save the image data, clear the buffer, pBmpBuf and pColorTable of global variables, read in the application space in the file