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How to put char array into std::string
char* value = new char[required];
        f(name, required, value, NULL); // fill the array
        strResult->assign(value, required);
        delete [] value;

std::string strResult(required, '');
f(name, required, &strResult[0], NULL);

// optionally, to remove the extraneous trailing NUL (assuming f NUL-terminates):
strResult.pop_back();

return strResult;

std::string s(charArry);