目录前言一、环境变量的概念二、常见的环境变量三、环境变量特点及其相关指令3.1 环境变量的全局性3.2、环境变量的生命周期四、环境变量的组织方式五、C语言对环境变量的操作5.1 设置环境变量：setenv5.2 删除环境变
As a relative newcomer to 开发者_运维问答MFC, I see Device Contexts (DCs) a lot. I vaguely understand that it\'s something to do with drawing, but the specifics are not very well explained anywhere th
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