C ++，关于fprintf和ofstream [英] C++, regarding fprintf and ofstream

问题描述

我已经使用了fprintf一段时间了，我想问一个问题.这条fprintf行等效于什么:

I've been using fprintf for a while now and I'd like to ask a question. What is the equivalent of this fprintf line:

fprintf(OutputFile, "%s", "SomeStringValue");

使用ofstream吗?

我真的很想知道如何使用ofstream中的％s".如何接受下一个参数并将其打印为字符串?

How to use the "%s" in ofstream is what I'd really like to know. How to take the next argument and print it as a string?

推荐答案

您不能.您只需将字符串写入流中.

You can't. You just write the string to the stream.

如果您想为字符串提供一些其他格式(如使用空格填充右对齐)，则可以使用I/O操纵器setfill(' ')(将填充字符设置为空格字符)和setw(length)(设置输出的宽度).如果您想模仿C样式格式字符串的语法，可以使用 Boost.format .

If you mean you want to provide some additional formatting to the string (like right justified with space padding), then you can use the I/O manipulators setfill(' ') (set the fill character to be the space character) and setw(length) (setting the width of the output). If you want something that mimics the syntax of the C style format strings, you can use Boost.format.

std::cout << boost::format("%s") % "SomeStringValue";

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