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文章介绍了一种实时截取ＶＧＡ图像的方法，分析了在ＤＯＳ操作系统下，后台读写文件所遇到的问题，给出了解决ＤＯＳ重入的具体步骤，并用程序实现了这种方法。
This paper introduces a method of capturing VGA images in real time, analyzes the problems encountered in background reading and writing files under the DOS operating system, and presents the specific steps to solve the DOS reentrancy, and realizes this method with the program.