Visual Studio std :: stringstream pubsetbuf不工作 [英] Visual Studio std::stringstream pubsetbuf does not work

问题描述

pubsetbuf std :: stringbuf的成员在Visual Studio 2010中根本无效！

pubsetbuf member of std::stringbuf is not working at all in Visual Studio 2010!

代码：

char *FileData = ... ;
unsigned long long FileDataLen = ... ;
std::stringstream *SS = new std::stringstream(std::stringstream::in | std::stringstream::out);
SS->rdbuf()->pubsetbuf( FileData, (std::streamsize)FileDataLen );

pubsetbuf 在Visual Studio中不执行任何操作！

pubsetbuf does nothing in Visual Studio!!!

解决方法＃1 ：

std::stringstream *SS = new std::stringstream( std::string(FileData, (size_type)FileDataLen ) ),std::stringstream::in | std::stringstream::out);

解决方法＃2 ：

SS->rdbuf()->sputn(FileData, (streamsize)FileDataLen);

但这两种解决方法都会产生不必要的内存复制。
我肯定需要一个工作的 pubsetbuf 成员std :: stringbuf。

But both of these workarounds produce unnecessary memory copying. I definitely need a working pubsetbuf member of std::stringbuf.

推荐答案

code> putsetbuf 只对 fstream 才有意义（技术上， std :: basic_filebuf ），其中缓冲区和流是两个不同的东西。

putsetbuf only makes sense for fstream (technically, for std::basic_filebuf), where the buffer and the stream are two different things.

对于 stringstream c $ c> std :: basic_stringbuf ）它们是一个相同的std :: string。

For stringstream (technically, std::basic_stringbuf) they are one and the same std::string.

如果你需要一个工作流一个外部字符串，考虑 std :: strstream ：或 boost :: iostreams :: array_sink

If you need a stream that works on a string that's external to it, consider std::strstream: or boost::iostreams::array_sink

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