如何在Windows下从node.js写入NUL设备? [英] How can I write to the NUL device under Windows from node.js?

问题描述

这困扰了我好几天了.我知道将标准流重定向到NUL设备的情况，但事实并非如此. node.js在其fs本机/libuv绑定下使用CreateFileW.

This is bugging me for several days now. I know about the standard stream redirection to the NUL device, but this isn't the case. node.js uses CreateFileW under its fs native/libuv bindings.

不幸的是使用了类似的东西:

Unfortunately using something like:

require('fs').writeFileSync('NUL', 'foo')

在具有3个字节的cwd中创建一个NUL文件.

creates a NUL file into the cwd that has 3 bytes.

我尝试写入\ Device \ Null，但是由于我几乎是* nix头，其中的所有内容都是文件，因此我未能真正找到\ Device \ Null的工作路径.例如\\.\ Device \ Null会抛出ENOENT.

I tried writing to the \Device\Null, but since I'm pretty much a *nix head where everything is a file, I failed to actually find a working path for \Device\Null. Such as \\.\Device\Null that throws ENOENT.

关于如何在Windows下执行此操作的任何想法?

Any ideas about how to make this work under Windows?

这似乎是相关的，但我无法跟踪全部从lib/fs.js到uv/src/win/fs.c进行检查，以确保path参数不受某种相对于绝对路径分辨率的影响.

This seems to be related, but I can not track the whole flow from lib/fs.js to uv/src/win/fs.c to check that the path argument doesn't suffer from some kind of relative to absolute path resolution.

推荐答案

NUL设备的有效路径是"\\\\.\\NUL"，而不是NUL，因此用法是:fs.writeFileSync("\\\\.\\NUL", "foo").在GitHub上针对Node.js引发了此问题: https://github. com/nodejs/node-v0.x-archive/issues/9271

Valid path to NUL device is "\\\\.\\NUL", not NUL, so the usage is: fs.writeFileSync("\\\\.\\NUL", "foo"). This issue was raised against Node.js on GitHub: https://github.com/nodejs/node-v0.x-archive/issues/9271

由于NUL是设备而不是文件，因此必须通过设备名称空间进行访问-这需要将\\.\放在开头(其他斜杠用于转义)-请参见

Since NUL is a device, not a file, it has to be accessed via device namespace - this requires putting \\.\ in the beginning (the other slashes are for escaping) - see https://msdn.microsoft.com/en-gb/library/windows/desktop/aa365247.aspx#Win32_Device_Namespaces.

NPM上还有一个简单的dev-null库，可用于流: https://www.npmjs.com/package/dev-null (虽然不是.writeFile).

There is also a simple dev-null library on NPM that can be used with streams: https://www.npmjs.com/package/dev-null (not with .writeFile though).

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