CODEWITHSUNDEEP
c++java-native-interface
Androider
Androider

Reputation: 21335

Can I create an std::ifstream based on a char* rather than a file?

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* ?

Thanks

Upvotes: 2

Views: 1719

Answers (2)

Keith Layne
Keith Layne

Reputation: 3795

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;

....

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.

Upvotes: 5

Adrian Cornish
Adrian Cornish

Reputation: 23916

Have your thought about using string streams - they often behave like files. Does you code really want an ifstream and not a istream. If it was written with an istream you could just drop in a stringstream/istringstream classes.

Upvotes: 2

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