使用YAML-CPP将YAML发射器内容保存到文件中 [英] Save a YAML Emitter content to a file with YAML-CPP

问题描述

我刚刚开始使用yaml-cpp，我设法正确地构建了它，并运行了yaml-cpp Wiki中的一些示例，但是我找不到将发射器保存到文件中的方法.

I just started playing around with yaml-cpp, I managed to build it properly and run some of the examples from the yaml-cpp wiki but I can't find a way to save my emitter to a file.

这不可能吗?我的意思是PyYAML库为此提供了一个转储"功能. yaml-cpp中没有这种功能吗? 是否有一些变通办法将yaml发射器转换为stl流，然后将其转储到yaml文件?

Is this not possible? I mean the PyYAML library has a 'dump' function for this. Is there no such functionality in yaml-cpp? Is there some workaround to converting a yaml emitter to a stl stream and then dumping this to a yaml file?

请让我知道

谢谢， 亚当

推荐答案

函数Emitter::c_str()返回以NULL结尾的C样式字符串(您不必释放该字符串)，然后可以将其写入到文件.例如:

The function Emitter::c_str() returns a NULL-terminated C-style string (which you do not have to release), which you can then write to a file. For example:

YAML::Emitter emitter;
emitter << "Hello world!";

std::ofstream fout("file.yaml");
fout << emitter.c_str();

还有Emitter::size()，它返回该字符串中的字节数，以防您想执行更高级的操作并且不想遍历字符串以查找其长度.

There is also Emitter::size(), which returns the number of bytes in that string, in case you want to do something more advanced and don't want to walk the string to find its length.

如果您只想将Node转储到流中，则有一个快捷方式:

If you want to just dump a Node to a stream, there's a shortcut:

YAML::Node node = ...;
std::ofstream fout("file.yaml");
fout << node;

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