将字符串传递给具有读取特征的函数 [英] Pass string to function taking Read trait

问题描述

我想在第3方库( xmltree-rs )中调用此函数:

I want to call this function in a 3rd party library (xmltree-rs):

pub fn parse<R: Read>(r: R) -> Element {

预期的用例是给它一个文件，如下所示:

The expected use case is to give it a file, like so:

let e: Element = Element::parse(File::open("tests/data/01.xml").unwrap());

但是我有一个想要传递的String，隐约是这样的:

However I have a String which I want to pass, vaguely like this:

xmltree::Element::parse("<example>blah</example>".to_owned());

但是，这当然会导致错误:

However this, of course, gives an error:

error: the trait `std::io::Read` is not implemented for the type `collections::string::String` [E0277]

如果不写临时文件，我该怎么办? (例如，在Python中，我可以使用 StringIO模块来包装一个类似文件的对象中的字符串)

How would I do this, short of writing a temporary file? (e.g in Python I would use the StringIO module to wrap the string in a file-like object)

推荐答案

要了解实现特质的原因，请转到

To find out what implements a trait, go to the bottom of the page for that trait.

在这种情况下，最有前途的实现者是&'a [u8]和Cursor<Vec<u8>>.

In this case, the most promising looking implementers are &'a [u8] and Cursor<Vec<u8>>.

您可以通过调用&str或String获取&[u8]. rel ="noreferrer"> as_bytes() ，注意自动取消引用和

You can obtain a &[u8] from a &str or String by calling as_bytes(), taking note of automatic dereferencing and Deref on Strings. Alternatively, you could use a byte literal if you are only using the ASCII subset.

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