外部“C” char ** environ - Windows - C ++ / CLI [英] extern "C" char** environ - Windows - C++/CLI

问题描述

我有一些旧的linux代码我试图移植到Windows。
当我第一次建立它作为一个直的本地DLL，我没有问题这段代码，但是当我试图使它成为一个混合模式C ++ / CLI DLL，我得到一个未解决的外部对象错误：

I have some old linux code I'm trying to port to Windows. When I first built it as a straight native DLL, I go no issues with this piece of code, but when I tried making it a mixed-mode C++/CLI DLL, I got an unresolved external object error on this:

extern "C" char** environ;

为什么这将适用于本机而不是CLI？

Why would this work for native and not CLI? Any idea how to work around this, or what it even does?

推荐答案

保存环境变量（PATH ，等等）。 C标准（如果我记得正确）要求 environ 指向这些变量的数组。它们也作为 main 入口点函数的第三个参数传递。

That holds the environment variables (PATH, etc, etc). The C standard (if i recall correctly) requires environ to point to an array of these variables. They're also passed as the 3rd argument to the main entry point function.

显然，由于某种原因， C ++ / CLI不会初始化它。

Apparently, for some reason, the C++/CLI doesn't initialize that.

要解决这个问题，你可以自己分配它，并填写 getenv （C）或 Environment.GetEnvironmentVariables （托管C ++）。我不知道有什么就地修复，但它不应该太难。

To fix that, you can allocate it yourself and fill with either either getenv (C) or Environment.GetEnvironmentVariables (Managed C++). I don't know of any in-place fix, but it shouldn't be too hard.

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