我可以基于char *而不是文件创建std :: ifstream吗? [英] Can I create an std::ifstream based on a char* rather than a file?

问题描述

我对在Java和C ++之间共享数据感兴趣，因此对JNI感兴趣.当前，所有C ++代码都希望有一个文件，因此，所有文件均以std :: ifstream的形式编写.与其编写文件并再次读取它们，不如只是传递一个char *并让应用程序从中读取内容，而不是以某种方式将char *视为ifstream.无论如何，有没有创建基于char *的ifstream?

I am interested in sharing data between Java and C++ so JNI. Currently all the C++ code expects a file so its all written in terms of std::ifstream. Rather than writing the files and reading them again, I would like to be able to just pass a char* over and have the application read from that instead somehow treating the char* as a ifstream. Is there anyway to create a ifstream that is based on a char* ?

谢谢

推荐答案

是的，它称为std::istringstream.您可以像这样使用它:

Yes, it's called std::istringstream. You can use it like this:

#include<sstream>

....

char const* s = "whatever";

std::istringstream iss(std::string(s));

int i;

iss >> i;

....

如果您的代码期望特定的std::ifstream ，则可以将其更改为期望通用的std::istream，正如Adrian所说，这两个都可以继承.

If your code expects a std::ifstream specifically, you could change it to expect a generic std::istream, from which both inherit, as Adrian mentioned.

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