system() 有什么不好?

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问题描述

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鉴于您正在构建一个 Windows 专属程序，为什么对 system() 的调用如此讨厌?自从我开始用 C++ 编程以来，不要接触系统"是我听过很多次的话.我温顺地遵守了这个原则，但这有什么不好?

Given that you're building a Windows - exclusive program, why are calls to system() so hated? Ever since I started programming in C++, "don't touch system" was something I've heard an awful lot. I've obeyed that principle docilely but what's so bad about it?

推荐答案

您在系统调用中放置的内容取决于您将在其上运行程序的操作系统.所以它是完全不可移植的.此外，许多事情都可能出错，因为您只是向虚空发出命令，并希望一切顺利.错误处理(例如-您要运行的程序不存在，或PATH设置不正确，或您没有权限等)非常困难甚至不可能.

What you put inside the system call is dependent on the OS you will run the program on. So it's completely non-portable. Also, many things can go wrong, as you're just throwing a command into the void, and hope that everything will go fine. Error handling (for example - the program you want to run does not exist, or PATH is not set correctly, or you don't have permissions, etc.) is very hard or even impossible.

除此之外，正如大部分时间(真正大多数"，例如 99.999%)的评论中所指出的，不需要使用 system.

Beside this, as noted in the comments most of the time (really "most", like 99.999%) there is no need to use system.

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