CODEWITHSUNDEEP
c++iosobjective-c
Marinos K
Marinos K

Reputation: 1819

convert std::u16string to NSString

In my Native Library I used to have this function to return a NSString out of a std::string:

- (NSString*)return_my_cpp_string {
    NSString* result = [NSString stringWithCString:my_cpp_string.c_str() encoding:[NSString defaultCStringEncoding]];
    return result;
}

I now need to update this function so that it rather returns a NSString out of an std::u16string but I can't find any obvious way to do so.

Upvotes: 4

Views: 401

Answers (1)

Remy Lebeau
Remy Lebeau

Reputation: 595402

Use stringWithCharacters:length instead of stringWithCString:encoding.

stringWithCharacters takes a pointer to a C-style array of UTF-16 code units as input. std::u16string is a UTF-16 encoded string, so you can use its data as-is, eg:

- (NSString*)return_my_cpp_string {
    const unichar *pchars = (const unichar *) my_cpp_string.c_str();
    NSString* result = [NSString stringWithCharacters:pchars length:my_cpp_string.size()];
    return result;
}

Upvotes: 3

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