高分彩象的驻留灰度打印法

随着EGA/VGA彩色适配器在IBMPC系列及其兼容机中的广泛应用和各种高级语言版本的更新 ,用户已能在屏幕上绘制精美的彩色图象。然而 ,由于DOS操作系统的拷屏程序仅对CGA显示模式有效 ,高分辨率图象的屏幕硬拷贝就成了问题。常规解决方案是直接读取视频缓冲区 ,而不同显示模式的不同缓冲区首址 ,更令编程雪上加霜 ,且通用性差。本文介绍的方法采用直接读取屏幕象素 ,不涉及显示模式 ,具有编程简单 ,通用性强的特点。而其驻留内存的工作方式 ,又使应用更为方便。

A new resident printing method for high resolution color graphics

Since high resolution color monitor has been widely used in the IBM PC series as well as the compitable computers,Clients can draw any marvelous color graphics on the screen. However,because of the drawbacks of DOS,it is quite difficult to print graphics from the screen.Usual solution is to fetch the buffer.But different displaying mode different address in the buffer. It is hard to make program,and not suitable for common application. In this article,the method is to get pixel from the screen directly.It has no relation with the mechanism of color monitor.So it is easy to make program,especially,its running manner of resident memory can be widely used for quantity of applications.