如何将多个文件流合并为一个内存二进制流? [英] How to combine several file streams to one memory binary stream?

问题描述

我尝试如下，但是ostream无法实例化?

I tried as below, but ostream cannot be instantiate?

ifstream ifs1("file1");<br />ifstream ifs2("file2");<br />ostream oss;<br />oss << ifs1 << ifs;

推荐答案

ostream是抽象基类-这就是为什么无法实例化它.另外，您不能在流上使用插入运算符来获取所需的内容.

所以...内存二进制流"是什么意思?如果您使用的是字符串，则应该可以使用:

ostream is an abstract base class - that''s why you can''t instantiate it. Also, you can''t use the insertion operator on streams to get what you''re wanting.

So...what do you mean by "memory binary stream"? If you were using strings, then this should work:

ifstream ifs1("file1");<br />ifstream ifs2("file2");<br />ostringstream oss;<br />std::copy(std::istream_iterator<char>(ifs1), std::istream_iterator<char>(), std::ostream_iterator<char>(oss));<br />std::copy(std::istream_iterator<char>(ifs2), std::istream_iterator<char>(), std::ostream_iterator<char>(oss));

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