Conversion from basic_string to jstring

Question

I'm using a basic_string<wchar_t> type and need to convert it into a jstring to pass through a JNI layer. I'm wondering what the best way to do that is. I have a function that can give me a std::string from my basic_string<wchar_t> type, so an answer to that would also be cool.

Cheers.

Note that std::basic_string<wchar_t> is typedef'ed to std::wstring. — Kerrek SB
– Kerrek SB, Commented Aug 8, 2011 at 23:24
Am trying to do the reverse of that, and am trying to see if I can avoid using a char* anywhere in there. — sparkFinder
– sparkFinder, Commented Aug 8, 2011 at 23:45
possible duplicate of stackoverflow.com/questions/870414/… — user195488
– user195488, Commented Aug 8, 2011 at 23:53

zwcloud · Accepted Answer · 2019-04-15 06:36:01Z

You'll need to convert the std::basic_string into UTF-8. Look into what your wstring -> string conversion does.

Sun has a JNI tutorial that shows how to convert a char* into a jstring (using some UTF conversion routines). You could use your wstring->string, then pass in string.c_str() to the NewStringUTF function:

Untested Code:

JNIEXPORT jstring JNICALL StringTest(JNIEnv *env) { const char* test = "something"; return env->NewStringUTF(test); }

That expects a const char*. What if I need to convert from std::string?

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