使用DirectDraw画线。表面是一个按线性排列的内存块，它可以用一个char数组来描述。通过调用IDirectDrawSurface::Lock()方法，就可以访问与每个表面相关的内存。-using DirectDraw line drawing. The surface is a linear arrangement on the block of memory, it can use a char array to describe. By calling IDirectDrawSurface : : Lock () method, we can visit with each surface-associated memory.